Hello Everyone,
EDIT: I've solved it. I did not have a clear enough understanding of the CAN Protocol and the Transceiver I was using. There were 2 things I did to solve my issue:
1) I connected the Tx Signal to the Transceiver. I previously did not have it connected to anything and was just probing the pin.
2) I calculated the Sync parameters on the receiving end.
All is well now, but I'll leave this up in case anyone comes across this issue.
ORIGINAL MESSAGE:
I am trying to send data using the CAN peripherals on the CY8CKit-044 and it does not send any data. Below is my code, and I've attached the full project for context.
I'm monitoring the return value of CAN_SendMsg() and it returns a success 8 times then constantly fails. When CAN_SendMsg() succeeds there is no signal on the physical pin (TX: P0[1], RX: P0[0]) when I probe it. It doesn't look like it is actually transmitting anything before it fails.
I'm absolutely lost. I followed the Component Datasheet (incl. trimming with WCO). Even when I load the example project there is no signal on the pins. Has anyone encountered this? Am I forgetting to enable or reset something?
Any insight on this would be a huge help.
/* ---- MAIN LOOP ---- */
CAN_TX_MSG CAN_Msg;
CAN_DATA_BYTES_MSG txData;
#define CAN_MESSAGE_ID (0x1AAu)
#define CAN_MESSAGE_IDE (0u) /* Standard message */
#define CAN_MESSAGE_IRQ (0u) /* No transmit IRQ */
#define CAN_MESSAGE_RTR (0u) /* No RTR */
#define TX_DATA_SIZE (25u)
uint8 MESSAGE[] = {0x00,0x11,0x00,0x11,0x00,0x11,0x00,0x11}; //define 8 bytes of data
int main(void)
{
CAN_Msg.dlc = CAN_TX_DLC_MAX_VALUE;
CAN_Msg.id = CAN_MESSAGE_ID;
CAN_Msg.ide = CAN_MESSAGE_IDE;
CAN_Msg.irq = CAN_MESSAGE_IRQ;
CAN_Msg.msg = &txData;
CAN_Msg.rtr = CAN_MESSAGE_RTR;
uint8 error = 0;
uint8 i;
RGB_Init();
USB_Bridge_Start();
CAN_Start();
CAN_SetOpMode(CAN_ACTIVE_RUN_MODE);
CyGlobalIntEnable; /* Enable global interrupts. */
for(i=0; i < CAN_TX_DLC_MAX_VALUE; i++){
txData.byte = MESSAGE; /* move data to the structure */
}
for(;;)
{
error = CAN_SendMsg(&CAN_Msg);
if(error == CAN_FAIL)
{
RGB_Blink(Red, 1);
}
else if(error == CYRET_SUCCESS)
{
RGB_Blink(Green, 1);
}
}
}
