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How can I receive a message by UART with Serial_LDD??

Question asked by Arturo Arteaga on Mar 23, 2017
Latest reply on Mar 23, 2017 by Arturo Arteaga



I have just managed to send a message to PC from a MK20DX256VLH7 microcontroller after changing the proposed configuration in “Getting started Guide for Processor Expert”.


Now I want to receive data from PC to microcontroller and to re-send from microcontroller to PC the same data. I have developed a new Project for testing to inizialite a future new application. The problem is that my project doesn´t receive anything now.


I have attached my proyect in this mail (Serie_Comunication) in which I use “AS1_OnBlockReceived” function in "Events.c" file. I think “AS1_OnBlockReceived” function should be called in "Events.c" file when a data is received but this function isn´t called when I send data from PC to microcontroller by writing from a keyboard in Tera application in order to send data to microcontroller. In this “AS1_OnBlockReceived” function I use “SendBlock” function (it´s just functional) and also I use “GPIO1_ToggleFieldBits” (this function makes a toggle in a led) in order to check if the function is really called “AS1_OnBlockReceived” function.


Why “AS1_OnBlockReceived”  function isn´t called when a data is sent for me from the PC to microcontroller?? This function is enabled in AS1 component and also it appears as enabled in “AS1.h” file from the project. Also you can see “PE_ISR(AS1_Interrupt)” function in “AS1.c” file. In “Vectors.c” file, you can see that both of the interrupts also appears.


Please, see all captured images attach here related on I have just mentioned before.


Interrupts enabled


Funtions enabled



Should I configure anything more in the AS1 component ?? I can just send, but perhaps should be there any lack to manage the reception data and send data at the same time??


I have seen in “AS1.h” file that “TX interrupt” is enabled. In 146 line from “AS1.h” file, you can see the next:


#define ENABLED_TX_INT        0x01U    /*!< TX interrupt enabled      */

#define BREAK_DETECTED        0x02U    /*!< Break detected            */

#define TX_COMPLETED          0x04U    /*!< Transmission completed    */

#define ENABLE_TX_COMPLETE    0x10U    /*!< Enable/Disable of TX complete detection. Used in the polling mode only */


but I haven’t found anything about RX interrupt enabled. Do you know anyway in the configuration that you can set "RX interrupt" enabled like “TX interrupt”?


Do you know if I have to set the RX in another lines??, like the next lines in “AS1.c" that appear like this:


LDD_TError AS1_SendBlock(LDD_TDeviceData *DeviceDataPtr, LDD_TData *BufferPtr, uint16_t Size)


  AS1_TDeviceDataPtr DeviceDataPrv = (AS1_TDeviceDataPtr)DeviceDataPtr;


  if (Size == 0U) {                    /* Is the parameter Size within an expected range? */

    return ERR_PARAM_SIZE;             /* If no then error */


  if (DeviceDataPrv->OutDataNumReq != 0x00U) { /* Is the previous transmit operation pending? */

    return ERR_BUSY;                   /* If yes then error */


  /* {Default RTOS Adapter} Critical section begin, general PE function is used */


  DeviceDataPrv->OutDataPtr = (uint8_t*)BufferPtr; /* Set a pointer to the output data. */

  DeviceDataPrv->OutDataNumReq = Size; /* Set the counter of characters to be sent. */

  DeviceDataPrv->OutSentDataNum = 0x00U; /* Clear the counter of sent characters. */

  DeviceDataPrv->SerFlag |= ENABLED_TX_INT; /* Set the flag ENABLED_TX_INT */

  UART_PDD_EnableInterrupt(UART1_BASE_PTR, UART_PDD_INTERRUPT_TRANSMITTER); /* Enable TX interrupt */

  /* {Default RTOS Adapter} Critical section end, general PE function is used */


  return ERR_OK;                       /* OK */






static void InterruptTx(AS1_TDeviceDataPtr DeviceDataPrv)



  if (DeviceDataPrv->OutSentDataNum < DeviceDataPrv->OutDataNumReq) { /* Is number of sent characters less than the number of requested incoming characters? */

    UART_PDD_PutChar8(UART1_BASE_PTR, *(DeviceDataPrv->OutDataPtr++)); /* Put a 8-bit character to the transmit register */

    DeviceDataPrv->OutSentDataNum++;   /* Increment the counter of sent characters. */

    if (DeviceDataPrv->OutSentDataNum == DeviceDataPrv->OutDataNumReq) {

      DeviceDataPrv->OutDataNumReq = 0x00U; /* Clear the counter of characters to be send by SendBlock() */



  } else {

    UART_PDD_DisableInterrupt(UART1_BASE_PTR, UART_PDD_INTERRUPT_TRANSMITTER); /* Disable TX interrupt */

    DeviceDataPrv->SerFlag &= (uint16_t)(~(uint16_t)ENABLED_TX_INT); /* Clear the flag ENABLED_TX_INT */








  /* {Default RTOS Adapter} ISR parameter is passed through the global variable */


  register uint32_t StatReg = UART_PDD_ReadInterruptStatusReg(UART1_BASE_PTR); /* Read status register */


  if (StatReg & (UART_S1_NF_MASK | UART_S1_OR_MASK | UART_S1_FE_MASK | UART_S1_PF_MASK)) { /* Is any error flag set? */

    (void)UART_PDD_GetChar8(UART1_BASE_PTR); /* Dummy read 8-bit character from receiver */

    StatReg &= (uint32_t)(~(uint32_t)UART_S1_RDRF_MASK); /* Clear the receive data flag to discard the errorneous data */


  if (StatReg & UART_S1_RDRF_MASK) {   /* Is the receiver's interrupt flag set? */

    InterruptRx(DeviceDataPrv);        /* If yes, then invoke the internal service routine. This routine is inlined. */


  if (DeviceDataPrv->SerFlag & ENABLED_TX_INT) { /* Is the transmitter interrupt enabled? */

    if (StatReg & UART_S1_TDRE_MASK) { /* Is the transmitter empty? */

      InterruptTx(DeviceDataPrv);      /* If yes, then invoke the internal service routine. This routine is inlined. */





Do you know if I should change this code by hand or by “Generate Processor Expert Code” tool?? I think I should write “RX interrupt” by “Generate Processor Expert Code” tool? But In which side of Component Inspector should I change the configurations?


Perhaps should I use another component to reseive instead of Serial_LDD?? or another different component to receive as to send?? or perhaps another function or another event function that is called when a data is in the buffer input waiting for receive?

Sorry because of asking a lot of questions, but I am unaware because of the lack of information. I have seen "KINETIS_72MHz_SRC" board sample code, but the only projects are for "code warrior". Are they for "Kinetis Design Studio" too?? and for UART what I've found only two driver files that thay aren´t developed for "Processor Expert" and aren´t developed for "Kinetis Design Studio". Do you know another examples?


Thank you again for your effort,


Have a nice day,


Arturo Arteaga

Original Attachment has been moved to: Serie_Comunication.rar