PGA450Q1EVM: Lin problme

Hi WonGeun,

Do you have an error in the PGA450_isrs.c file?

id = pid&0x0F;
cmd = pid&0x30;
cmd = cmd>>4;	
if (id != deviceAddress && pid != 0x01)
{
	return;
}
switch (cmd){

From the looks of this code snippet, you are allocating the the first 4-LSBs to the ID for a total of 16 different addresses (b0000xxxx).

Your CMD field is only 2-bits to allow up to 4 commands (b00xx0000).

I suspect you want to swap these such that the first 4-LSBs allow support for up to 16 commands, and a 2-bit address field be available for up to four devices. The revised code would look like:

cmd = pid&0x0F;
id = pid&0x30;
id = id>>4;

You will also need to update your deviceAddress code in the main function to ensure only bits 4 and 5 reflect the address, and then shift to bit space 0 and 1 to properly check against the id != deviceAddress condition.

When hardcoding the ID to 0 and 1, the LIN commands worked as expected on a single device based on your customized command 2 return:

id = pid&0x30;                 // Akeem changed to reflect new id method
DATA_CNT = 5;		// Number of bytes to be transmitted
TX_DATA0 = 0xAA;
TX_DATA1 = pid;
TX_DATA2 = id | 0x10;
TX_DATA3 = rangetest;
TX_DATA4 = 0x55;

Results:

When ID=0, NumBytesToRecv=5, RxPID=02, RtrnData= AA,02,10,00,55

When ID=1, NumBytesToRecv=5, RxPID=02, RtrnData= AA,12,10,00,55