Other Parts Discussed in Thread: HALCOGEN
Hi,
I am trying to send data between two TMS570LS3137 processors through CAN communication. But retransmission of the same data is happening. refer the data enclosed below:
From board 1:
canTransmit(canREG1, canMESSAGE_BOX1, &Tx_data)
To Board 2:
canGetData(canREG1, canMESSAGE_BOX1, &Rx_data).
As per the Technical reference manual
"According to the CAN Specification (ISO11898), the DCAN provides a mechanism to automatically
retransmit frames that have lost arbitration or have been disturbed by errors during transmission. The
frame transmission service will not be confirmed to the user before the transmission is successfully completed.By default, this automatic retransmission is enabled."
This is the code generated by Halcogen for the same
uint32 canTransmit(canBASE_t *node, uint32 messageBox, const uint8 * data)
{
uint32 i;
uint32 success = 0U;
uint32 regIndex = (messageBox - 1U) >> 5U;
uint32 bitIndex = 1U << ((messageBox - 1U) & 0x1FU);
/** - Check for pending message:
* - pending message, return 0
* - no pending message, start new transmission
*/
if ((node->TXRQx[regIndex] & bitIndex) != 0U)
{
success = 0U;
}
else
{
/** - Wait until IF1 is ready for use */
/*SAFETYMCUSW 28 D MR:NA <APPROVED> "Potentially infinite loop found - Hardware Status check for execution sequence" */
while ((node->IF1STAT & 0x80U) ==0x80U)
{
} /* Wait */
/** - Configure IF1 for
* - Message direction - Write
* - Data Update
* - Start Transmission
*/
node->IF1CMD = 0x87U;
/** - Copy TX data into IF1 */
for (i = 0U; i < 8U; i++)
{
#if ((__little_endian__ == 1) || (__LITTLE_ENDIAN__ == 1))
/*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are only allowed in this driver" */
node->IF1DATx[i] = *data;
/*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are only allowed in this driver" */
/*SAFETYMCUSW 567 S MR:17.1,17.4 <APPROVED> "Pointer increment needed" */
data++;
#else
/*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are only allowed in this driver" */
node->IF1DATx[s_canByteOrder[i]] = *data;
/*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are only allowed in this driver" */
/*SAFETYMCUSW 567 S MR:17.1,17.4 <APPROVED> "Pointer increment needed" */
data++;
#endif
}
/** - Copy TX data into message box */
/*SAFETYMCUSW 93 S MR: 6.1,6.2,10.1,10.2,10.3,10.4 <APPROVED> "LDRA Tool issue" */
node->IF1NO = (uint8) messageBox;
success = 1U;
}
return success;
}
How to disable this automatic retransmission is in the above function?
Thanks,
Jemin P James
