I2C internal Freq (Multiplier Factor)

jacewalton — Mon, 02 Nov 2020 13:55:34 GMT

Using MK22FX512VLK12 chip programming with P&E micro Multilink universal Programmer

I am Trying to get the I2C bus working.

nothing is sent across the data or clock lines. I looked on my Oscilloscope and nothing happens.

I am using the code from "typical usage section under "Help on Component"

Component documentation - Typical Usage

volatile bool DataReceivedFlg = FALSE; volatile bool DataTransmittedFlg = FALSE; uint8_t OutData[4] = {0x00U, 0x01U, 0x02U, 0x03U};                /* Initialization of output data buffer */ uint8_t InpData[16]; LDD_TError Error; LDD_TDeviceData *MyI2CPtr;  void main(void) {   . . .   MyI2CPtr = I2C2_Init(NULL);                                     /* Initialization of I2C2 component */   /* Configure I2C BUS device(e.g. RTC) - Write Operation */   Error = I2C2_MasterSendBlock(MyI2CPtr, OutData, 4U, LDD_I2C_SEND_STOP); /* Send OutData (4 bytes) on the I2C bus and generates a stop condition to end transmission */   while (!DataTransmittedFlg) {                                   /* Wait until OutData are transmitted */   }   DataTransmittedFlg = FALSE;    /* Read configuration of I2C BUS device(e.g. RTC) - Read Operation */   OutData[0] = 0x00U;                                             /* Initialization of OutData buffer */   Error = I2C2_MasterSendBlock(MyI2CPtr, OutData, 1U, LDD_I2C_NO_SEND_STOP); /* Send OutData (1 byte) on the I2C bus stop condition and will not generate the end of the transmission */   while (!DataTransmittedFlg) {                                   /* Wait until OutData are transmitted */   }   DataTransmittedFlg = FALSE;    Error = I2C2_MasterReceiveBlock(MyI2CPtr, InpData, 16U, LDD_I2C_SEND_STOP); /* Receive InpData (16 bytes) from the I2C bus and generates a stop condition to end transmission */   while (!DataReceivedFlg) {                                      /* Wait until InpData are received */   }   DataReceivedFlg = FALSE;    for(;;) {} }

In the Processor expert under I2C channel 1 the interal frewquency is sent t 5.24288 Mhz this is the lowest frequency that I could select. Here is a picture There is a warning that this device is designed to operate at 100k could this be my problem?

This is the lowest frequency that I could choose

Re: I2C internal Freq (Multiplier Factor)

harshpatel — Tue, 31 Jan 2017 06:26:47 GMT

Hello Jace Walton

Can you share your full code/I2c part of your code? it may easy to fix issue.

Thanks & regards

Harsh

Re: I2C internal Freq (Multiplier Factor)

jacewalton — Fri, 03 Feb 2017 18:12:55 GMT

Found the problem look above where I had circled in the original post you can select a clock divider

Re: I2C internal Freq (Multiplier Factor)

harshpatel — Tue, 14 Feb 2017 07:53:49 GMT

Thats good...

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I2C internal Freq (Multiplier Factor)

Re: I2C internal Freq (Multiplier Factor)

Re: I2C internal Freq (Multiplier Factor)

Re: I2C internal Freq (Multiplier Factor)