This video shows how to use Processor Expert to configure the KSDK GPIO Peripheral Driver with the component fsl_gpio in Kinetis Design Studio. The steps show how to blink the red and blue LEDs while reading the SW2 button input of a FRDM-K64F. The procedure can be replicated for any KSDK supported board and also with PE Driver Suite. Enjoy!

This community post describes how to combine the ADC and DMA using KSDK to simulate a flexible peripheral storing the ADC results into a buffer stored in memory.   In this configuration the MCU uses less resources, only using one ADC and the hardware (DMA) chainging the ADC channel and filling up the memory buffer with the results of the ADC. This way the MCU does not need to read the ADC result register being everything done automatically.                        KSDK The Kinetis Software Development Kit (SDK) is an extensive suite of robust peripheral drivers, stacks, middleware and example applications designed to simplify and accelerate application development on any Kinetis MCU. The addition of Processor Expert technology for software and board support configuration provides unmatched ease of use and flexibility. The Kinetis SDK is complimentary and includes full source code under a permissive open-source license for all hardware abstraction and peripheral driver software.   KINETIS_SDK   FRDM-K64M The FRDM-K64F is an ultra-low-cost development platform for Kinetis K64, K63, and K24 MCUs. The FRDM-K64F hardware is form-factor compatible with the Arduino™ R3 pin layout, providing a broad range of expansion board options. Features: MK64FN1M0VLL12 MCU (120 MHz, 1 MB flash memory, 256 KB RAM) for more information see FRDM-K64F   DMA to Emulate ADC Flexible Scan To emulate flexible scan it is necessary to configure the DMA to change the input ADC channel. The channel numbers are defined in the ADC_mux array. The conversion results are stored in the ADC0_resultBuffer array with the following order:   ADC0_CH12. ADC0_CH13. ADC0_CH23.   The Kinetis K series of microcontrollers also offers a powerfulDMA peripheral with up to 16 channels that can be combined with the ADC to allow the scanning of more than two channels.   System overview ADC Flexible Scan mode requires two DMA channels for one ADC converter. DMA channel 1 with a higher priority transfers the resultant ADC data from the ADC0_RA register to a memory buffer. DMA channel 0 with a lower priority transfers the next ADC channel setting (input multiplexer channel) from the constant buffer. The following figure depicts the application Figure 1. Depicts the application Flow diagram: The example code that accompanies this application note demonstrates a continuous scan conversion from three ADC channels. Each channel is measured four times, so the result buffer size is 3 × 4 = 12 (the real buffer size is 16, to demonstrate that only 12 data field parts are written). The ADC works in hardware trigger mode, with the LPTMR timer serving as the trigger source. Scanning is executed in continuous mode; thus, after a major loop has finished, the result buffer pointer address_0 is reloaded and the conversion begins again from the start buffer address. To calculate and change the frequency, check the macro INPUT_SIGNAL_FREQ to change the frequency value in Hz. The DMA1 is triggered by the ADC, and the DMA0 is triggered by the eLINK of minor   loop of DMA1. In this example the frequency is set to10 Hz, and is the number of samples is 10.   Figure 2. Flow diagram Configuration with SDK Configure the ADC (functions and structures):   The ADC initialization in the application is shown on the following code snippet.   The ADC is in interruption mode. Trigger by LPTMR (HW trigger)                                     Trigger for eDMA enable                                     Fist channel input is 0x0C.  Channel ADC_SE12                                     Select the channel in chnNum                             /*      * Initialization ADC for      * 12bit resolution, interrrupt mode, hw trigger enabled.      * normal convert speed, VREFH/L as reference,      * disable continuouse convert mode.      */ ADC_DRV_StructInitUserConfigForIntMode(&adcUserConfig);     adcUserConfig.hwTriggerEnable = true;     adcUserConfig.continuousConvEnable = false;     adcUserConfig.dmaEnable = true;      ADC_DRV_Init(instance, &adcUserConfig, &gAdcState);      /* Install Callback function into ISR. */    ADC_DRV_InstallCallback(instance, 0U, adc_chn0_isr_callback);      adcChnConfig.chnNum = ADC_INPUT_CHAN;     adcChnConfig.diffEnable = false;     adcChnConfig.intEnable = true;     adcChnConfig.chnMux = kAdcChnMuxOfA;      /* Configure channel0. */     ADC_DRV_ConfigConvChn(instance, 0U, &adcChnConfig);     /* Configure channel1, which is used in PDB trigger case. */      return 0;           To use the DMA driver, follow these steps:   1.  Initialize the DMA module: EDMA_DRV_Init();   2.  Request a DMA channel: DMA_DRV_RequestChannel(); 3.  Configure the TCD:  EDMA_DRV_PrepareDescriptorTransfer(); and EDMA_DRV_PushDescriptorToReg(); 4.  Register callback function: EDMA_DRV_InstallCallback(); 5.  Start the DMA channel: EDMA_DRV_StartChannel(); NOTE: the next two functions are optional for stop and free DMA channel 6.  Stop the DMA channel: EDMA_DRV_StopChannel(); 7.  Free the DMA channel: dma_free_channel().   Initialize the DMA module: EDMA_DRV_Init();   In this function you can select the eDMA channel to use and this function initializes the run-time state structure to provide the eDMA channel allocation release, protect, and track the state for channels. This function also opens the clock to the eDMA modules, resets the eDMA modules and initializes the module to user-defined settings and default settings.   chnDMA1.channel= kEDMAChannel1; chnDMA0.channel=kEDMAChannel0;   userConfig.chnArbitration = kEDMAChnArbitrationFixedPriority; userConfig2.chnArbitration= kEDMAChnArbitrationRoundrobin; userConfig.notHaltOnError = false; userConfig2.notHaltOnError = false;     EDMA_DRV_Init(&state, &userConfig); EDMA_DRV_Init(&state2, &userConfig2);          Request a DMA channel: DMA_DRV_RequestChannel();   This function allocates eDMA channel according to the required channel allocation andcorresponding to the eDMA hardware request, initializes the channel state memory provided by user and fills out the members.   This function provides two ways to allocate an eDMA channel: statically and dynamically. In a static allocation, the user provides the required channel number and eDMA driver tries to allocate the required channel to the user. If the channel is not occupied, the eDMA driver is successfully assigned to the user. If the channel is already occupied, the user gets the return value kEDMAInvalidChn, this is request a channel in a static way, In a dynamic allocation, any of the free eDMA channels are available for use. eDMA driver assigns the first free channel to the user.   //request ADC1// uint8_t requestDMA1 = EDMA_DRV_RequestChannel(kEDMAChannel1, kDmaRequestMux0ADC0, &chnDMA1); if(kEDMAInvalidChannel==requestDMA1)                      {                      printf("EDMAInvalidChannel 1 .  the request is failed.");                      } //request DMA0// uint8_t requestDMA0 = EDMA_DRV_RequestChannel(kEDMAChannel0, kDmaRequestMux0AlwaysOn63, &chnDMA0); if(kEDMAInvalidChannel==requestDMA0)                      {                      printf("EDMAInvalidChannel 0.  the request is failed.");                      }       DMA configurations: is shown on the following code snippet. (edma_transfer_config_t) TCD is a configuration structure, inside has a parameters to change for different types to transfers data.  srcAddr: memory address  pointing to the source data destAddr: memory address pointing to the destination address srcTransferSize: Source data transfer size. destTransferSize: Destination data transfer size. srcOffset: Sign-extended offset applied to the current source address form the next-state value as each source read/write is completed. destOffset: Sign-extended offset applied to the current destination address form the next-state value as each source read/write is completed. srcLastAddrAdjust: Last source address adjustment. destLastAddrAdjust: Last destination address adjustment. Note here it is only valid when scatter/gather feature is not enabled. srcModulo: Source address modulo. destModulo: Destination address modulo.                             minorLoopCount: Minor bytes transfer count. Number of bytes to be transferred in each service request of the channel. majorLoopCount: Major iteration count.   //////////configuration and ELINK DMA channel 1 //////////////////////////////////////////////////////////////////////////////////////////////////////////////        config[kEDMAChannel1].srcAddr = (uint32_t)(&ADC0_RA);  /*!< Memory address pointing to the source data. */        config[kEDMAChannel1].destAddr = (uint32_t)(&ADC0_resultBuffer[0]);/*!< Memory address pointing to the destination data. */        config[kEDMAChannel1].srcTransferSize = kEDMATransferSize_2Bytes;   /*!< Source data transfer size. */        config[kEDMAChannel1].destTransferSize = kEDMATransferSize_2Bytes;  /*!< Destination data transfer size. */        config[kEDMAChannel1].srcOffset = 0;         /*!< Sign-extended offset applied to the current source address to                                            form the next-state value as each source read/write is completed. */        config[kEDMAChannel1].destOffset = 2;        config[kEDMAChannel1].srcLastAddrAdjust = 0;    /*!< Last source address adjustment. */        config[kEDMAChannel1].destLastAddrAdjust = -24;   /*!< Last destination address adjustment. Note here it is only valid when scatter/gather feature is not enabled. */        config[kEDMAChannel1].srcModulo = kEDMAModuloDisable;       /*!< Source address modulo. */        config[kEDMAChannel1].destModulo = kEDMAModuloDisable;       /*!< Destination address modulo. */        config[kEDMAChannel1].minorLoopCount = 2;    /*!< Minor bytes transfer count. Number of bytes to be transferred                                             in each service request of the channel. */        config[kEDMAChannel1].majorLoopCount = 12;    /*!< Major iteration count. */   stcdDmaChn1.NBYTES.MLNO=0x02; /////////////////////////////Elink on/////////////////LINKCH/////major loop chn1// stcdDmaChn1.BITER.ELINKNO= (DMA_BITER_ELINKNO_ELINK_MASK|0x0000|0x0C); stcdDmaChn1.CITER.ELINKNO= (DMA_CITER_ELINKNO_ELINK_MASK|0x0C); stcdDmaChn1.ATTR= (DMA_ATTR_SSIZE(1)|DMA_ATTR_DSIZE(1)); stcdDmaChn1.CSR=(DMA_CSR_MAJORLINKCH(0)|DMA_CSR_MAJORLINKCH_MASK | DMA_CSR_INTMAJOR_MASK);   uint16_t statusChnn1 = EDMA_DRV_PrepareDescriptorTransfer(&chnDMA1, &stcdDmaChn1, &config[kEDMAChannel1], true, false);   if(kStatus_EDMA_Success == statusChnn1)        {          statusChnn1 = EDMA_DRV_PushDescriptorToReg(&chnDMA1, &stcdDmaChn1);        }         EDMA_DRV_PrepareDescriptorTransfer(); This function sets up the basic transfer for the descriptor.   EDMA_DRV_PushDescriptorToReg(); This function copies the software TCD configuration at for the hardware TCD. You needs fill up the structure stcd, and this function do transfer  all structure data in  DMA registers, is use a especial configuration In this case, the structure is filling up to configuration ELINK mode. The ELINK mode is a configuration of eDMA for triggers other DMA channel in each minion loop transfer is complete.   This is a registers of structure,  the mask to enable put on ElINKON mode  and for select channel to link and for put on the major loop to finishing trigger channel. stcd.BITER.ELINKNO= (DMA_BITER_ELINKNO_ELINK_MASK|0x0000|0x0C); stcd.CITER.ELINKNO= (DMA_CITER_ELINKNO_ELINK_MASK|0x0C);         DMA_BITER_ELINKNO_ELINK_MASK it’s a mask to active the channel-to-channel linking on minor-loop complete. As the channel completes the minor loop, this flag enables linking to another channel, defined by theLINKCH field. The link target channel initiates a channel service request via an internal mechanism You can see more information in Reference manual. ///////configuration DMA channel0 ///////////////////////////////////////////////////////////////////////////////////////     config[kEDMAChannel0].srcAddr = (uint32_t)(&ADC_mux[0]);     /*!< Memory address pointing to the source data. */        config[kEDMAChannel0].destAddr = (uint32_t)(&ADC0_SC1A);   /*!< Memory address pointing to the destination data. */        config[kEDMAChannel0].srcTransferSize = kEDMATransferSize_1Bytes;   /*!< Source data transfer size. */        config[kEDMAChannel0].destTransferSize = kEDMATransferSize_1Bytes;  /*!< Destination data transfer size. */        config[kEDMAChannel0].srcOffset = 1;         /*!< Sign-extended offset applied to the current source address to                                            form the next-state value as each source read/write is completed. */        config[kEDMAChannel0].destOffset = 0;        config[kEDMAChannel0].srcLastAddrAdjust = -3;    /*!< Last source address adjustment. */        config[kEDMAChannel0].destLastAddrAdjust = 0;   /*!< Last destination address adjustment. Note here it is only valid when scatter/gather feature is not enabled. */        config[kEDMAChannel0].srcModulo = kEDMAModuloDisable;       /*!< Source address modulo. */        config[kEDMAChannel0].destModulo = kEDMAModuloDisable;       /*!< Destination address modulo. */        config[kEDMAChannel0].minorLoopCount = 1;    /*!< Minor bytes transfer count. Number of bytes to be transferred                                             in each service request of the channel. */        config[kEDMAChannel0].majorLoopCount = 3;    /*!< Major iteration count. */         uint16_t statusChnn0 = EDMA_DRV_PrepareDescriptorTransfer(&chnDMA0, &stcdDmaChn0, &config[kEDMAChannel0], true, true);        if(kStatus_EDMA_Success == statusChnn0)        {               statusChnn0 = EDMA_DRV_PushDescriptorToReg(&chnDMA0, &stcdDmaChn0);        }         The function drivers in main file:          hardware_init();        dbg_uart_init();        OSA_Init();        init_adc(ADC_INST); init_trigger_source(ADC_INST);        config_DMA();   Open your terminal (baud rate 115200)    The results will appear on the terminal software.   Figure 3. Screen serial You can also see the results in the debugger window. Figure 4.  result buffer Steps to include ADC Flexible Scan software to KSDK   In order to include this demo in the KSDK structure, the files need to be copied into the correct place. The adc_dma_demo folder should be copied into the <KSDK_install_dir>/demos folder. If the folder is copied to a wrong location, paths in the project and makefiles will be broken. When the copy is complete you should have the following locations as paths in your system: <KSDK_install_dir>/demos/ adc_dma_demo /iar <KSDK_install_dir>/demos/ adc_dma_demo /kds <KSDK_install_dir>/demos/ adc_dma_demo /src In addition, to build and run the demo, it is necessary to download one of the supported Integrated Development Enviroment (IDE) by the demo: Freescale Kinetis Design Studio (KDS) IAR Embedded Workbench   Once the project is opened in one of the supported IDEs, remember to build the KSDK library before building the project, if it was located at the right place no errors should appear, start a debug session and run the demo.

This article is for beginners. It describes how to create an FreeRTOS project based on MCUXpresso IDE 10.2.1. Software and Tools In this article, I’m using the following: MCUXpresso IDE 10.2.1   www.nxp.com/mcuxpresso ,  MCUXpresso SDK 2.4.1 for  Frdm-k66f  board.  With Amazon FreeRTOS v10 .You can get it from https://mcuxpresso.nxp.com FRDM-K66 board www.nxp.com/frdm-k66f Before creating a FreeRTOS project, you have to install SDK first. Download the SDK package SDK_2.4.1_FRDM-K66F.zip,  drag and drop it into the “Installed SDKs” view. You will be prompted with a dialog asking you to confirm the import –click OK. The SDK will be automatically installed into MCUXpresso IDE part support repository. Quick Start Go to the ‘QuickStart’ Panel in the bottom left of the MCUXpresso IDE window, and click new project. On the “Board and/or device selection” page, select board frdmk66f. You will see some description relating to the your selection. Click ‘next’… You will see the basic project creation and setting page. Basic setting The project will be given a default name based on the MCU name. Name the project, select the right device package. Board files: This field allows the automatic selection of a default set of board support files, else empty board files will be created. Project type:  Selecting ‘C’ will automatically select Redlib libraries, selecting c++ will select NewllibNaro librarires. Project option: enable semihost will cause the semihost variant of the chosen library to be selected;  CMSIS-Core will cause a CMSIS folder containing a variety of support code to be created. OS: For a FreeRTOS project, make sure FreeRTOS is selected. Please select the drivers and utilities according to your requirements. Click ‘next’, you will go to advanced project settings page. Advanced Project setting This page will take certain default options based on settings from the first wizard project page. Set library type:    Please use Redlib for C projects, and NewlibNarno for SDK C++ projects. Next panel allows options to be set related to Input/Output. Hardware settings: set options such as the type of floating point support available/required. MCU C compiler:  Set various compiler options Click ‘finish’ will create a simple ‘hello world’ C project for Freedom K66f . Basically does the initialization of the pins, clocks, debug console and peripherals. int main(void) {          /* Init board hardware. */     BOARD_InitBootPins();     BOARD_InitBootClocks();     BOARD_InitBootPeripherals();        /* Init FSL debug console. */     BOARD_InitDebugConsole();       PRINTF("Hello World\n");       /* Force the counter to be placed into memory. */     volatile static int i = 0 ;     /* Enter an infinite loop, just incrementing a counter. */     while(1) {         i++ ;     }     return 0 ; } Click the project settings, we can see some basic information of this project, a right click on these nodes provides direct options to edit the associated setting. Add FreeRTOS task #include <stdio.h> #include "board.h" #include "peripherals.h" #include "pin_mux.h" #include "clock_config.h" #include "MK66F18.h" #include "fsl_debug_console.h" /* TODO: insert other include files here. */   /* FreeRTOS kernel includes. */ #include "FreeRTOS.h" #include "task.h"     /* TODO: insert other definitions and declarations here. */           /* Task priorities. */ #define my_task_PRIORITY (configMAX_PRIORITIES - 1) /*******************************************************************************  * Prototypes  ******************************************************************************/ static void my_task(void *pvParameters);     /*!  * @brief Task responsible for printing of "Hello world." message.  */ static void my_task(void *pvParameters) {     for (;;)     {         PRINTF("Hello World!\r\n");         vTaskSuspend(NULL);     } }       /*  * @brief   Application entry point.  */ int main(void) {          /* Init board hardware. */     BOARD_InitBootPins();     BOARD_InitBootClocks();     BOARD_InitBootPeripherals();        /* Init FSL debug console. */     BOARD_InitDebugConsole();       if (xTaskCreate(my_task, "my_task", configMINIMAL_STACK_SIZE + 10, NULL, my_task_PRIORITY, NULL) != pdPASS)     {         PRINTF("Task creation failed!.\r\n");         while (1)             ;     }     vTaskStartScheduler();       /* Enter an infinite loop, just incrementing a counter. */     while(1) {       }     return 0 ; } Run the application Build your application, go to menu Project > Build Project. Alternatively go to the quick start panel and click the hammer button. Go to menu Run> Debug configurations… Select the ‘Debug configuration’ that matches your connection type, in this example Segger Jlink is used. Then click ‘Apply’ and ‘Debug’ Open a terminal, select the appropriate port and set baudrate to 115200 Run the application, you will see “Hello world” in terminal   For information about configuring with MCUXpresso pins tool in an FreeRTOS project, please see the following document https://community.nxp.com/docs/DOC-341987   For information about configuring with MCUXpresso peripheral tool in an FreeRTOS project, please see the following document. https://community.nxp.com/docs/DOC-341986

Created DAC Sinus example is PIT triggered with own buffer and is for FRDM-K64F.   adding analog component fsl_dac peripheral driver to project setting Voltage reference - Reference 2 for dac component (daConv1:fsl_dac) adding timer component fsl_pit peripheral driver to project setting period on 1 ms and enabling interrupts for timer component (pitTimer1:fsl_pit) setting buffer for sinusoidal in Sources -> Events.c #define DAC_TEST_BUFF_SIZE  (120U) uint16_t dac_buffer[DAC_TEST_BUFF_SIZE] =     {         0x7ff, 0x86a, 0x8d5, 0x93f, 0x9a9, 0xa11, 0xa78, 0xadd, 0xb40, 0xba1,         0xbff, 0xc5a, 0xcb2, 0xd08, 0xd59, 0xda7, 0xdf1, 0xe36, 0xe77, 0xeb4,         0xeec, 0xf1f, 0xf4d, 0xf77, 0xf9a, 0xfb9, 0xfd2, 0xfe5, 0xff3, 0xffc,         0xfff, 0xffc, 0xff3, 0xfe5, 0xfd2, 0xfb9, 0xf9a, 0xf77, 0xf4d, 0xf1f,        0xeec, 0xeb4, 0xe77, 0xe36, 0xdf1, 0xda7, 0xd59, 0xd08, 0xcb2, 0xc5a,         0xbff, 0xba1, 0xb40, 0xadd, 0xa78, 0xa11, 0x9a9, 0x93f, 0x8d5, 0x86a,         0x7ff, 0x794, 0x729, 0x6bf, 0x655, 0x5ed, 0x586, 0x521, 0x4be, 0x45d,         0x3ff, 0x3a4, 0x34c, 0x2f6, 0x2a5, 0x257, 0x20d, 0x1c8, 0x187, 0x14a,         0x112, 0xdf, 0xb1, 0x87, 0x64, 0x45, 0x2c, 0x19, 0xb, 0x2,         0x0, 0x2, 0xb, 0x19, 0x2c, 0x45, 0x64, 0x87, 0xb1, 0xdf,         0x112, 0x14a, 0x187, 0x1c8, 0x20d, 0x257, 0x2a5, 0x2f6, 0x34c, 0x3a4,         0x3ff, 0x45d, 0x4be, 0x521, 0x586, 0x5ed, 0x655, 0x6bf, 0x729, 0x794       }; uint16_t index = 0; void pitTimer1_IRQHandler(void) {   /* Clear interrupt flag.*/   PIT_HAL_ClearIntFlag(g_pitBase[FSL_PITTIMER1], FSL_PITTIMER1_CHANNEL);   /* Write your code here ... */    DAC_DRV_Output(FSL_DACONV1,dac_buffer[index++]);   if(index==DAC_TEST_BUFF_SIZE)       index = 0;  }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍   FRDM-K64F with SALEAE   sinusoidal output     Enjoy! 🙂

The latest Kinetis SDK 1.1.0 supported HID bi-directional communication, the new API USB_Class_HID_Recv_Data() can be used to receive data from USB HOST. But without demo and test tool, customer still has no idea about how to enstablish such kind of communication in their application. I create a simple demo derived from existed hid_keyboard project, together with basic endpoint read/write test by Bus Hound. The demo is built and tested on my FRDM-K64F and can be port to other USB Kinetis device as well. Working steps: 1) Unzip attached code and project to C:\Freescale\KSDK_1.1.0\usb\example\device\hid folder. 2) Compile project (IAR) and download to FRDM-K64F via CMSIS-DAP debugger. 3) Open Bus hound, enter "Devices" table and uncheck all box and check "auto select hot plugged devices". 4) Plug USB cable and connects to PC, will found the device is checked in bus hound device tree. 5) Double click device, and select OUT endpoint to send 16 bytes to device. 6) Observe the g_OUT_ep_buf[]'s change in firmware (Demostrate receive function only)

Just today release new KSDK version 1.2. and KDS 3.0! Download here   For more details please visit our websites Software Development Kit for Kinetis MCUs|Freescale and Kinetis Design Studio Integrated Development |Freescale   What´s new   Added device family support:   MK10D10 MK66F18 MKL34Z4 MK11DA5 MKL02Z4 MKL36Z4 MK20D10 MKL14Z4 MKL43Z4 MK21DA5 MKL15Z4 MKV40F15 MK21FA12 MKL16Z4 MKV43F15 MK26F18 MKL17Z4 MKV44F15 MK30D10 MKL17Z644 MKV45F15 MK40D10 MKL24Z4 MKV46F15 MK50D10 MKL25Z4 MKW01Z4 MK51D10 MKL26Z4 MKW21D5 MK52D10 MKL27Z4 MKW22D5 MK53D10 MKL27Z644 MKW24D5 MK65F18 MKL33Z4 MK24F12 MK63F12   Added Peripheral support: AOI ENC FLEXBUS FLEXIO LMEM VREF XBAR PWM   Documentation   Kinetis SDK v.1.2.0 Release Notes http://cache.freescale.com/files/soft_dev_tools/doc/support_info/KSDK120RN.pdf?fsrch=1 Kinetis SDK v.1.2 API Reference Manual http://cache.freescale.com/files/soft_dev_tools/doc/support_info/KSDK12APIRM.pdf?fsrch=1 Kinetis SDK v.1.2 Demo Applications User's Guide http://cache.freescale.com/files/soft_dev_tools/doc/support_info/KSDK12DEMOUG.pdf?fsrch=1 Getting Started with Kinetis SDK (KSDK) v.1.2 http://cache.freescale.com/files/soft_dev_tools/doc/support_info/KSDK12GSUG.pdf?fsrch=1 MQX™ RTOS for Kinetis SDK 1.2.0 Release Notes http://cache.freescale.com/files/soft_dev_tools/doc/support_info/MQXKSDK120RN.pdf?fsrch=1   Porting an MQX RTOS Application to MQX RTOS for Kinetis SDK http://www.freescale.com/files/soft_dev_tools/doc/support_info/MQXKSDKPUG.pdf   for KDS 3.0. please don´t forget visit New Kinetis Design Studio V3.0.0 available   Enjoy! Iva

When you need to create copy/clone of i.g. web_hvac example for FreeRTOS as standalone project, you can face this issue. It is impossible to work with the copy. Why? There is missing folder for RTOS and LIB.   ISSUE: You start to clone example There is missing folder for RTOS Also missing library ksdk_freertos_lib which is needed for the example Impossible to compile the project, because folder mentioned above are missing in the project WORKAROUND: Just add the folder rtos from C:\Freescale\KSDK_1.3.0 The same for the library, you add to the folder from C:\Freescale\KSDK_1.3.0\lib Import .wsd file Wsd file was successfully imported, library is included Build successful finished   I hope this helps you. Iva

Hello to all,   This document explains how to drive a 16x2 LCD using the KSDK Drivers using the FRDM-KL25Z.     Project Generator, KSDK1.3 and KDS3.0 are used in this example.   I hope you find it useful. David

Hi folks,   I would like to share my experience using lwIP with KSDK1.2, I hope this will be useful for people who is getting started with this TCP/IP stack.   I must admit that I really dislike working over an example application (please do not misunderstand my message, these examples are really nice but just as examples, not to develop new applications over them), the problem is that these project are not stand alone and if they are moved from their original locations it becomes a mess. This is why I always create a standalone projects. For instance I will describe how to run ‘lwip_tcpecho_demo’ and after this, how to reproduce this example as a standalone project.   Running ‘lwip_tcpecho_demo’ Creating a new project with lwIP support using FreeRTOS       I hope you find it useful.   Regards, Carlos

This patch adds Segment LCD (SLCD) examples for the Kinetis Tower boards with the TWRPI-SLCD module.  It reuses the SLCD driver included in the "Kinetis SDK 1.2.0 Standalone for KL33Z for the FRDM-KL43Z", and ports the example to boards using the TWRPI-SLCD module.    The patch was written for KSDK v1.2.0, found at www.freescale.com/KSDK.  To install the patch, unzip to the KSDK installation directory, by default it is C:\Freescale\KSDK_1.2.0.  Only the Debug Build Configurations in the libraries and example applications were updated for these examples.  The Release Build Configurations will need to be updated before using.  The boards supported with these examples are:   TWR-KL46Z48M   TWR-KL43Z48M   TWR-KL46Z48M board example is provided with a project for Kinetis Development Studio (KDS) toolchain, and tested with KDS v3.0.0.  The path for this example is at  \KSDK_1.2.0\examples\twrkl46z48m\demo_apps\slcd_low_power_demo\kds.  The example also includes the KDS .WSD working set file.  When this is imported to KDS, it imports both the platform library and example application.  The example is written to display time on the TWRPI-SLCD, and will display mm:ss.   TWR-KL43Z48M board example is provided with a project for Kinetis Development Studio (KDS) toolchain, and tested with KDS v3.0.0.  The path for this example is at \KSDK_1.2.0\examples\twrkl43z48m\demo_apps\slcd_low_power_demo\kds.  The example also includes the KDS .WSD working set file.  When this is imported to KDS, it imports both the platform library and example application.  The example is written to display time on the TWRPI-SLCD, and will display mm:ss.

So far the composite msd_cdc demo from ksdk 1.3 just supports ram disk application, to have the SD card support just as the dev_msd demo, you have to go through the following steps: Add platform/composite/src/sdcard/fsl_sdhc_card.c and platform\drivers\src\sdhc\fsl_sdhc_irq.c to the project. Add project including path: platform\composite\inc and platform\drivers\inc. Change usb\example\device\composite\msd_cdc\disk.c as attached file      Change usb\example\device\composite\msd_cdc\disk.h as attached file      Change usb\example\device\composite\msd_cdc\hardware_init.c as attached file. Compile the demo and let it go, the PC would recognize the MSD and CDC device,  but might need you install the CDC driver, use the one from the folder of "C:\Freescale\KSDK_1.3.0\examples\twrk60d100m\demo_apps\usb\device\cdc\virtual_com\inf". With SD card inserted , you may see the removable disk, and format the disk just like below: Copy a ~50M file to this disk eject the disk after done, and then pull and plug the device again, you may verify the copied file with fc.exe command This solution has been tested on TWR-K60D100M with TWR-SER, both bm and mqx examples are verified ok, please kindly refer to the attached files for more details.

Examples for current KSDK 1.3 are located under C:\Freescale\KSDK_1.3.0\examples examples for middleware (tcpip, filesystem) under C:\Freescale\KSDK_1.3.0\middleware   There are more examples, which were created:   KSDK 1.3 Rainbow color using FTM PWM with KSDK 1.3 How to use printf() to print string to UART in KDS3.0 + KSDK1.3 Driving 16x2 LCD using KSDK drivers Integrating NFC Controller library with KSDK KL43Z support for sLCD and Touch sense using KDS3.0 +KSDK1.3.0 + Processor expert   KSDK 1.2 Using DMA to Emulate ADC Flexible Scan Mode with KSDK Writing my first KSDK1.2 Application in KDS3.0 - Hello World and Toggle LED with GPIO Interrupt Controlling speed in DC motors and position in servomotors with KSDK [FTM + GPIO] Line scan camera with KSDK [ADC + PIT + GPIO] A simple way to detect the track's center for the Freescale Cup Smart Race FatFs + SDHC data logger with KSDK in Kinetis Design Studio Segment LCD Example for KSDK KSDK GPIO driver with Processor Expert DAC Sinus Demo (using PEx + KSDK 1.2 + KDS 3.0) How to start customized KSDK project based on KSDK demo code   KSDK 1.1 An example project for FIR function implement on KV31 with SDK and CMSIS How to toggle LED in KDS 2.0 with KSDK 1.1.0 and Processor Expert KSDK SPI Master-Slave with FRDM-K64F Configuring Kinetis Software Development Kit (KSDK) to measure distance with ultrasonic transducers A demo project of USB HID bi-directional generic device for Kinetis SDK 1.1.0 Configuring Kinetis Software Development Kit (SDK) to measure distance with infrared (IR) sensor Writing my first KSDK Application in KDS - Hello World and GPIO Interrupt   KSDK 1.0 Writing your first toggle LED application with FRMD-K64F + KDS 1.1.0 + KSDK 1.0.0 Non-Processor Expert Low Power Application Using the SDK KSDK I2C EEPROM Example

Hello community,   This document shows the ease of use of the peripheral drivers from Kinetis SDK applied to the Freescale Cup smart car. This time I bring to you a document which explains how to make the line scan camera with KSDK works step-by-step. This document is intended to be an example for the ADC, the PIT and the GPIO peripheral drivers usage.   The required material to run this project is: Line scan camera (the project supports up to two cameras). FRDM-KL25Z based on the Kinetis Microcontroller KL25Z. FRDM-TFC shield. Mini-USB cable. TFC camera wire.   This material can be bought in The Freescale Cup Intelligent Car Development.              The document Create a new KSDK 1.2.0 project in KDS 3.0.0 explains how to create a new KSDK project for the KL25Z MCU. The result of this document is the project BM-KSDK-FRDM_KL25Z. The document Line scan camera with KSDK [ADC + PIT + GPIO] explains how to implement an application to acquire the data provided by the line scan camera. The result of this document is the project BM-KSDK-FRDM_KL25Z-LINE_SCAN_CAMERA.   The video below shows the line scan camera working.     If you are interested in participate in the Freescale Cup you could take a look into the groups University Programs, The NXP Cup Technical Reports The NXP Cup - Mexico, The NXP Cup - Brazil, The NXP Cup - China, The NXP Cup - Malaysia, The specified item was not found., The NXP Cup - North America, The specified item was not found., The NXP Cup - Taiwan, The NXP Cup EMEA.       Best regards, Earl Orlando Ramírez-Sánchez Technical Support Engineer Freescale Semiconductor

Hello dear community:   The attached document is an introductory guide to the Clock configuration system and Power manager system in KSDK v1.3 and its configuration using Processor Expert.   Some topics covered:   - KSDK Clock Manager system- Clock manager notification framework - Clock switch callbacks - KSDK Power Manager system - Power manager notification framework - Power mode switch callbacks - Creating and managing clock/power configurations with Processor Expert. - Managing custom clock/power callbacks with Processor Expert.   There is also an example project attached created for the FRDM-KL27Z board, but it can be taken as reference to use a different evaluation board or custom board. This project was developed by colleague Adrian Sanchez Cano.   I hope you find it useful. In case of any doubts please do not hesitate to ask.   Regards! Jorge Gonzalez

At the moment the best way to create a new KSDK example project is copying one of the existing projects in the /demos folder and renaming all the files and text to the new name. I've created a simple script that does all the work for you.   To run, just place the .exe or Perl script in the C:\Freescale\KSDK_1.0.0\demos folder and run. By default it'll copy the "hello_world" project to a new directory, and change all the "hello_world" text and files names to your new project name. Pretty straight forward, but much easier and less prone to error than doing it by hand. I've attached both the Perl source and a .exe created from that perl script. There is a command line option to specify the project to be copied, but by default it uses the hello_world one.   Hope you find it useful!

Very simple, but very often asked question - how can I import example in KSDK general? The easiest way is import .wsd file, it is a set of all needed files for your project.   1. Open KDS, go to Project Explorer Window and by right click select Import option 2. Choose Existing Projects Sets option 3. Click on Browse and select the project, which you would like to work. In case of KSDK 2.0 go to C:\Freescale\<ksdk2.0_package>\boards\frdmk64f\demo_apps\lwip\lwip_tcpecho\freertos\kds   4. You will see the demo project successfully imported in your Project Explorer window and now you can compile and execute demo project.   Enjoy! Iva

I created easy tutorial for UART KSDK blocking demo which works as echo. The demo works with KSDK 1.1. and is created for KDS 2.0.   Because it could be problem if was used this pin by this reason was chosen UART 3, which is available to use and is routed to PTC16,PTC17 connection on Arduino header for this case is use ALT3 function (PTC16, PTC17)   Final output from terminal Physical connection between FRDM-K64F and USB to Serial Converter The unzipped folder must be located in example folder at C:\Freescale\KSDK_1.1.0\demos\

This solution is just for you, who does not enjoy finding documentation for KSDK does not enjoy many opened windows (all in one) often ask where is the documentation for KSDK like an overview will appreciate embedded help   For detailed information please see KSDK 1.3.0 Documents Plugin for KDS 3.0.0   I hope you will really invite this tool. Iva

This video shall guide you on how to build and run the demo applications provided by Kinetis SDK.   Overview: Classes of software examples Importing and building library file project Importing, building and running a demo application   Software/Tools used: Kinetis Design Studio V3.0.0 Kinetis SDK V1.2.0 FRDM-K64F Board   Related Documents: Getting Started with Kinetis SDK v.1.2 - http://cache.freescale.com/files/soft_dev_tools/doc/support_info/KSDK12GSUG.pdf Kinetis SDK v.1.2 Demo Applications User’s Guide - http://cache.freescale.com/files/soft_dev_tools/doc/support_info/KSDK12DEMOUG.pdf Kinetis SDK FAQ - https://community.freescale.com/docs/DOC-102926   Related videos: Installation of KDS and Kinetis SDK - https://community.freescale.com/videos/3281 Installation of OpenSDA Firmware on Freedom Board - https://community.freescale.com/videos/3282 Debugging with Kinetis Design Studio - https://community.freescale.com/videos/3283 Using Processor Expert in KDS - https://community.freescale.com/videos/3297 KSDK GPIO driver with Processor Expert - https://community.freescale.com/videos/3195

For this demo, KSDK was configured to measure distance with a FRDM-K64F and the 255-400Sx16-ROX ultrasonic transducers. The transmitter transducer sends an ultrasound’s signal that travels through the air, after clashing with any object, the signal bounces and starts its way back until it gets to the receiver transducer. The time it takes for the ultrasound to arrive to the receiver can be use to measure the distance from the transducers to the object, because for a larger distance, the ultrasound’s travel time will be longer. When the receiver gets the ultrasound it generates an output signal, whose intensity is related to the distance to the reflective object, the signal is more intense for closer distances. The demo works for a range from 15 to 100 cm, if the distance to reflective object isn’t between this range, the results shown wouldn’t be reliable. The following figure shows the application’s block diagram Figure 1. Block Diagram        The schematic diagram for the application is shown in the following figure Figure 2. Schematic Diagram        The electrical connections needed to implement the demo are presented by this table Table 1. Electrical connections        The application’s flow diagram is displayed by the following figure Figure 3. Flow Diagram for Distance’s Calculation        The initial configuration for the FTM0 is presented in the following code snippet   void vfnFTM0_Config(void) {     ftm_user_config_t ftm0Info;          configure_ftm_pins(FTM_INSTANCE_0);          FTM_DRV_Init(FTM_INSTANCE_0, &ftm0Info);     FTM_DRV_SetTimeOverflowIntCmd(FTM_INSTANCE_0, true);     FTM_HAL_SetTofFreq(g_ftmBaseAddr[FTM_INSTANCE_0], TOF_FREQ_VALUE);          FTM_DRV_PwmStart(FTM_INSTANCE_0, &highTrueParam, HIGH_TRUE_PWM_CH);     FTM_DRV_PwmStart(FTM_INSTANCE_0, &lowTrueParam, LOW_TRUE_PWM_CH);     bPwmOnFlag = 1; }   The FTM0 was configured to generate two different signals of PWM that complement each other in order to duplicate their voltage’s range. First of all, it was necessary to configure the FTM0’s pins of the board, so that the PWM signals could be used externally to feed the ultrasonic Tx transducer. Then the FTM driver was initialized, the timer overflow interrupt was enabled and the NUMTOF was set to 14 so that just 15 PWM pulses were generated each time. Finally, the PWM was started at FTM0, generating a high true signal for channel 0 and low true for channel 1, these configurations were set from the structures highTrueParam and lowTrueParam of type ftm_pwm_param_t, in which the signals are configured as edge aligned, frequency of 40 kHz and the duty cycle is set to 50%.        The FTM0 IRQ Handler function was modified to match with the demo requirements   void FTM0_DRV_MyIRQHandler(void) {     FTM_DRV_IRQHandler(0U);     bDeadTimeCount++;     if(bPwmOnFlag)     {         FTM0_OUTMASK ^= PWM_CHANNELS_OUTMASK;         swPWMDeparture_CountVal = FTM2_CNT;         FTM_HAL_SetSoftwareTriggerCmd(g_ftmBaseAddr[0], true);         bPwmOnFlag = 0;     }     else if((!bPwmOnFlag) && (bDeadTimeCount == 50))     {         vfnStartPwm();         bDeadTimeCount = 0;     } }   After every 15 FTM0’s overflows this function was accessed and every 50 access to it determined the PWM dead time, which refers to the time between the sending of a PWM signal and the next one. The PWM dead time is necessary to avoid the clash of a signal being transmitted by the Tx transducer and the one that is returning to enter to the Rx, this clash could affect the genuine signal that bounced against the reflective object and also affect the distance measure’s results. If the PWM signals were active when entering to this function, then they should be disabled with the FTM0 outmask, this would assure that the sending pulses are just 15 and it would be harder that the returning bounced signal clashes with a prolonged sending signal. After disabling the PWM bPWMOnFlag is set to 0. On the other hand, if the bPWMOnFlag is disabled and the bDeadTimeCount has achieved the corresponding counts, the PWM is restarted and the bDeadTimeCount is set to 0.   The FTM2’s initial configurations are stated on the following code snippet void vfnFTM2_Config(void) {     ftm_user_config_t ftm2Info;          configure_ftm_pins(FTM_INSTANCE_2);     FTM_DRV_Init(FTM_INSTANCE_2, &ftm2Info);     FTM_HAL_SetClockPs(g_ftmBaseAddr[FTM_INSTANCE_2], kFtmDividedBy16);     FTM_DRV_SetTimeOverflowIntCmd(FTM_INSTANCE_2, true);          vfnInputCaptureStart(); }   For the FTM2, which was used for input capture mode, in this function were configured their pins, the driver was initialized, the clock prescaler was set to 16 and the timer overflow interrupt was enabled before calling to the function vfnInputCaptureStart(), in which are established more specific configurations for the input capture.   The FTM2 IRQHandler was also modified to trigger the required actions for the demo’s functionality void FTM2_DRV_MyIRQHandler(void) {     if ((FTM2_SC & 0x80))     {         bFtm2OverflowCount++;         FTM_HAL_ClearTimerOverflow(g_ftmBaseAddr[2]);     }     else     {         FTM_HAL_DisableTimerOverflowInt (g_ftmBaseAddr[2]);         CMP_DRV_Stop(1);         vfnGetPwmArriveTime();         vfnGetPwmTravelTime();         FTM_HAL_ClearChnEventStatus(g_ftmBaseAddr[2], 0);         bFtm2OverflowCount = 0;     } }   This function is accessed whether a timer overflow occurs or if a rising edge is detected by the input capture. If an overflow occurred then the overflow bit is clear and bFtm2OverflowCount’s value is increased by 1, this count is important for the signal’s travel time calculation. On the contrary, if the IRQ handler function is accessed because of the detection of a rising edge by the input capture, the timer overflow interrupt is disabled to avoid the count of time after the edge detection and to assure the correct travel time calculation. After storing the FTM2 count value as the arrive time of the signal, the function vfnGetPwmTravelTime() is called to calculate the total period of time that the signal spent on its travel through the air. Additionally the bFtm2OverflowCount is set to 0.        The comparator’s configurations are displayed on this function   void vfnCMP1_Config(void) {     cmp_user_config_t cmpParam =      {           .hystersisMode = kCmpHystersisOfLevel0, /*!< Set the hysteresis level. */           .pinoutEnable = true, /*!< Enable outputting the CMP1 to pin. */           .pinoutUnfilteredEnable = false, /*!< Disable outputting unfiltered result to CMP1. */           .invertEnable = false, /*!< Disable inverting the comparator's result. */           .highSpeedEnable = false, /*!< Disable working in speed mode. */       #if FSL_FEATURE_CMP_HAS_DMA           .dmaEnable = true, /*!< Enable using DMA. */       #endif /* FSL_FEATURE_CMP_HAS_DMA */           .risingIntEnable = true, /*!< Enable using CMP1 rising interrupt. */           .fallingIntEnable = false, /*!< Disable using CMP1 falling interrupt. */           .plusChnMux = kCmpInputChn1, /*!< Set the Plus side input to comparator. */           .minusChnMux = kCmpInputChn3, /*!< Set the Minus side input to comparator. */       #if FSL_FEATURE_CMP_HAS_TRIGGER_MODE           .triggerEnable = true, /*!< Enable triggering mode.  */       #endif /* FSL_FEATURE_CMP_HAS_TRIGGER_MODE */       #if FSL_FEATURE_CMP_HAS_PASS_THROUGH_MODE           .passThroughEnable = true  /*!< Enable using pass through mode. */       #endif /* FSL_FEATURE_CMP_HAS_PASS_THROUGH_MODE */     };          cmp_sample_filter_config_t cmpFilterParam =     {         .workMode = kCmpSampleWithFilteredMode, /*!< Sample/Filter's work mode. */         .useExtSampleOrWindow = false, /*!< Switcher to use external WINDOW/SAMPLE signal. */         .filterClkDiv = 32, /*!< Filter's prescaler which divides from the bus clock.  */         .filterCount =  kCmpFilterCountSampleOf7 /*!< Sample count for filter. See "cmp_filter_counter_mode_t". */     };       cmp_state_t cmpState;     configure_cmp_pins(CMP_INSTANCE_1);     CMP_DRV_Init(CMP_INSTANCE_1, &cmpParam, &cmpState);     CMP_DRV_ConfigSampleFilter(CMP_INSTANCE_1, &cmpFilterParam);     CMP_DRV_Start(CMP_INSTANCE_1); }   The initial configuration’s parameters for the comparator are stated on the structure cmpParam. First of all, the CMP1 input and output was enabled, the rising interrupt was enabled too. In addition, channel 1 was set as the plus side input of the comparator; this channel is the one that receives the output of the ultrasonic Rx transducer. On the other hand, channel 3 was configured as the minus side input of the comparator, this channel corresponds to the 12-bit DAC module that sets the comparison value. Finally, the trigger and the pass through mode were enabled. It was necessary to stabilize the comparators results, so a sample filter was configured in sample with filter mode, the filter’s prescaler for clock was set to 32 and the filter count sample was set to 7 samples.   After establishing all these parameters, the comparator’s pins were configured, the driver was initialized, the filter was configured to the CMP1 and the driver was started.        The 12-bit DAC was configured to generate the comparison value, as shown in this code snippet   void vfnDAC12_Config(void) {     dac_user_config_t dacParam;          // Set configuration for basic operation     DAC_DRV_StructInitUserConfigNormal(&dacParam);     // Initialize DAC with basic configuration     DAC_DRV_Init(DAC_INSTANCE_0, &dacParam);     // Set DAC's Comparison Value     DAC_DRV_Output(DAC_INSTANCE_0, CMP_DAC_VALUE); }        The DAC’s configuration was simple, the default configurations were used for this one, the driver was initialized and the comparison value was set to 4020. This value was selected according to the Rx transducer’s output signal, the comparison value was determined by the levels achieved, so that the demo could be able to detect a reflective object in all the distance’s range (15 to 100 cm).        The initialization for input capture mode are shown in this function   void vfnInputCaptureStart(void) {     FTM_HAL_SetChnEdgeLevel(g_ftmBaseAddr[FTM_INSTANCE_2], INPUT_CAPTURE_CH, INPUT_CAPTURE_RISING_EDGE);     FTM_HAL_SetMod(g_ftmBaseAddr[FTM_INSTANCE_2], FTM2_MOD_VALUE);     FTM_HAL_EnableChnInt(g_ftmBaseAddr[FTM_INSTANCE_2], INPUT_CAPTURE_CH);     FTM_HAL_SetChnInputCaptureFilter(g_ftmBaseAddr[FTM_INSTANCE_2], INPUT_CAPTURE_CH, INPUT_CAPTURE_FILTER_VAL);     FTM_HAL_SetCountReinitSyncCmd(g_ftmBaseAddr[FTM_INSTANCE_2], true);     FTM_HAL_SetCounterInitVal(g_ftmBaseAddr[FTM_INSTANCE_2], FTM2_COUNTER_INIT_VALUE);     FTM_HAL_SetClockSource(g_ftmBaseAddr[FTM_INSTANCE_2], kClock_source_FTM_SystemClk); }        The input capture’s configurations for the demo were: rising edge mode, the MOD value was set to its maximum (0xFFFF), the FMT2_CH0’s interrupt was enabled, the filter on the input was enabled to help in the stabilization of the signal being analyzed, the counter’s init value is set to 0 and finally, the system clock is selected as the clock source.        The function vfnStartPwm is the one that enables the PWM sending   void vfnStartPwm(void) {     FTM2_CNT = FTM2_COUNTER_INIT_VALUE;     FTM0_OUTMASK ^= PWM_CHANNELS_OUTMASK;     bPwmOnFlag = 1;     FTM_HAL_SetSoftwareTriggerCmd(g_ftmBaseAddr[FTM_INSTANCE_0], true);     FTM_HAL_EnableTimerOverflowInt (g_ftmBaseAddr[FTM_INSTANCE_2]);     CMP_DRV_Start(CMP_INSTANCE_1); }        Before enabling the PWM signals, the FTM2 count value is stored as the sending time of the signal, then the FTM0 outmask de PWM channels, the bPWMOnFlag is set to 1 and the comparator driver is start in order to wait the Rx transducer’s response.        The signal’s travel time calculation algorithm is presented in the following code snippet   void vfnGetPwmTravelTime(void) {     uint32_t wTimeDifference = 0;     static uint8_t bAux_OFCount = 0;     static uint32_t waTimeBuffer[TIME_SAMPLES];     static uint8_t bTimeSamples = 0;          bAux_OFCount = (bFtm2OverflowCount-1);          if(bFtm2OverflowCount != 0)     {         if(bAux_OFCount != 0)         {             wTimeDifference = (FTM2_MOD_VALUE * bAux_OFCount);         }         else         {             wTimeDifference = 0;         }         wTimeDifference = (wTimeDifference + (FTM2_MOD_VALUE - swPWMDeparture_CountVal));         wTimeDifference = (wTimeDifference + swPWMArrive_CountVal);     }     else     {         wTimeDifference = (swPWMArrive_CountVal - swPWMDeparture_CountVal);     }          waTimeBuffer[bTimeSamples] = wTimeDifference;     if(bTimeSamples != TIME_SAMPLES)     {         bTimeSamples++;     }     else     {         wAverageTravelTime = dwGetTravelTimeAverage(TIME_SAMPLES, waTimeBuffer);         vfnGetCurrentDistance();         bTimeSamples = 0;     } }   The travel time’s calculation algorithm is simple. If just one overflow occurred during the signal’s traveling period, the time difference is calculated as the difference of the FTM2_MOD_VALUE and the FTM2 counter value at the departure time, plus the counter value at the arriving time. Otherwise, if more than one overflow occurred then the time difference is the same as the last case, but adding the product of the FTM2_MOD_VALUE and the overflow’s counts minus 1. The simplest case is the one there haven’t been overflows, the time difference is calculated subtracting the departure counter value from the arriving counter value. After obtaining 20 samples of travel time an average of all these values is calculated so that the time data is the most reliable possible.   The distance calculation algorithm was implemented on the following function   void vfnGetCurrentDistance(void) {     static uint64_t dwDistance = 0;     uint8_t b_m = 3;     uint32_t w_b = 27130000;     uint32_t w_FixedPointAux = 100000;     uint16_t swTimeBase = 265;          // 265ns per FTM2 Count          wAverageTravelTime >>= 1;        wAverageTravelTime = (wAverageTravelTime*swTimeBase);          dwDistance = (wAverageTravelTime * w_FixedPointAux);     dwDistance = (dwDistance * b_m);     dwDistance = (dwDistance / w_FixedPointAux);     dwDistance = (dwDistance - w_b);          bDistanceIntegers = (dwDistance / w_FixedPointAux);       bDistanceUnits = (dwDistance % w_FixedPointAux);     bDistanceUnits = (bDistanceUnits / 10);          bDistanceReadyFlag = 1; }   The distance calculation is based on the linear behavior of the transducers’ response. Some samples of the signal’s travel time were taken for distances from 15 to 80 cm and according to that data, it was calculated a linear equation that describes the calculated travel time in function of the distance to the reflective object (See Figure 4 below). After getting the time difference, in FTM2 counts, between the departure and the arriving time of the signal, it was necessary to divide that number of counts, because that time difference corresponds to the travel of the signal to the reflective object and back to the transducers. Furthermore, it was required to convert those counts to real time, and according to the configurations of the FTM2, each of its counts was equal to 265 ns. The rest of the algorithm consists just on the use of the linear equation the travel time as variable, multiplying by the corresponding slope (b_m) and adding the intersection with the y-axis (w_b). The real values of the slope and the intersection with the y-axis were fixed in order to avoid the use of float variables.   The following graphic shows the characteristic linear behavior of the relation between the signal’s travel time and the distance from the transducers to the reflective object Figure 4. Characteristic curve’s graphic   The application test’s results are shown in the following table 1 The error for the Distance Measured is approximately ± 2 cm for short distances and ± 5 cm for the longer ones Table 2. Test’s Results        Steps to include the ultrasonic distance measurer demo in KSDK   In order to include this demo in the KSDK structure, the files need to be copied into the correct place. The ultrasonic_distance_measurer folder should be copied into the <KSDK_install_dir>/demos folder. If the folder is copied to a wrong location, paths in the project and makefiles will be broken. When the copy is complete you should have the following locations as paths in your system: <KSDK_install_dir>/demos/ultrasonic_distance_measurer/iar <KSDK_install_dir>/demos/ultrasonic_distance_measurer/kds <KSDK_install_dir>/demos/ultrasonic_distance_measurer/src In addition, to build and run the demo, it is necessary to download one of the supported Integrated Development Enviroment (IDE) by the demo: Freescale Kinetis Design Studio (KDS) IAR Embedded Workbench Once the project is opened in one of the supported IDEs, remember to build the KSDK library before building the project, if it was located at the right place no errors should appear, start a debug session and run the demo. The results of the distance measurement will be shown by UART on a console (use 115 200 as Baud rate) and at FreeMASTER, just as in the following example where the reflective object was located at 35 cm from the ultrasonic transducers: Figure 5. Example of the distance measured being shown in a console Figure 6. Example of the distance measure results at FreeMASTER      FreeMASTER configuration For visualizing the application’s result on FreeMASTER it is necessary to configure the corresponding type of connection for the FRDM-K64F:           1. Open FreeMaster.           2. Go to File/Open Project.           3. Open the Ultrasonic Distance Measurer project from <KSDK_install_dir>/demos/ultrasonic_distance_measurer/ FreeMaster.           4. Go to Project/Options.          On the Comm tab, make sure the option ‘Plug-in Module’ is marked and select the corresponding type of connection. Figure 7. Corresponding configurations FRDM-K64F’s connection at FreeMASTER   It is also necessary to select the corresponding MAP file for the IDE in which will be tested the demo, so:           1. Go to the MAP Files tab.           2. Select the MAP File for the IAR or the KDS project. *Make sure that the default path matches with the one where is located the MAP file of the demo at your PC. If not, you can modify the path by clicking on the ‘…’ button (see Figure 😎 and selecting the correct path to the MAP file: <KSDK_install_dir>/demos/ultrasonic_distance_measurer/iar/frdmk64f/debug/ultrasonic_distance_measurer_frdmk64f.out <KSDK_install_dir>/demos/ultrasonic_distance_measurer/kds/frdmk64f/Debug/ultrasonic_distance_measurer_frdmk64f.elf   Click on ‘OK’ to save the changes.   Figure 8. Selection of the MAP File for each IDE supported by the demo   Enjoy the demo!