1) [CAN1-LED red , CAN2-LED off] when power ON but not yet receiving anything.
2) [CAN1-LED green, CAN2-LED blinking] CAN1 is receiving msgs (and CAN2 is outputting)
3) [CAN1-LED red , CAN2-LED off] when CAN1 stops receiving msgs (but power remains ON)
Steps 1 and 2 are working, but step 3 is not happening.
What is happening instead is that when I stop transmission to CAN1 the LEDs just freeze and keep their last state (whatever that was).
I don't understand why, since I expect the program to keep looping so timers keep increasing, and the LED check is still done every 500ms.
Here are the relevant code snippets:
Code: Select all
int main ( void)
{
// init hardware
HW_Init();
// init CAN
CAN_UserInit();
// init timer
SYSTIME_Init();
// Set red LEDs for CAN1 and CAN2
HW_SetLED ( HW_LED_CAN1, HW_LED_RED);
HW_SetLED ( HW_LED_CAN2, HW_LED_OFF);
LED_awake = 0;
LastCycleMsg = 0;
timenow = 0;
interval_count_500ms = 0;
// main loop
while (1)
{
CANMsg_t RxMsg;
// process messages from CAN1: VCAN input
if (CAN_UserRead (CAN_BUS1, &RxMsg) != 0)
{
// wake up LEDs
LED_awake = 1;
}
// process messages from CAN2: private VCAN
if (CAN_UserRead (CAN_BUS2, &RxMsg) != 0)
{
// do nothing
}
// timer increments every 10ms
timenow = SYSTIME_NOW;
if (SYSTIME_DIFF (LastCycleMsg, timenow) >= 10000)
{
LastCycleMsg += 10000;
interval_count_500ms += 1;
}
// periodic actions
if (interval_count_500ms >= 50)
{
// toggle LEDs if message received on CAN1
if (LED_awake)
{
LED_toggleCAN ^= 1;
if (LED_toggleCAN)
{
HW_SetLED (HW_LED_CAN1, HW_LED_GREEN);
HW_SetLED (HW_LED_CAN2, HW_LED_OFF);
}
else
{
HW_SetLED (HW_LED_CAN1, HW_LED_OFF);
if (outputHonda_enabled) // CAN2 LED color indicates which output is being sent.
{
HW_SetLED (HW_LED_CAN2, HW_LED_ORANGE);
}
else
{
HW_SetLED (HW_LED_CAN2, HW_LED_RED);
}
}
}
else
{
HW_SetLED (HW_LED_CAN2, HW_LED_RED); // not working...?
HW_SetLED (HW_LED_CAN2, HW_LED_OFF);
}
LED_awake = 0;
// reset counter
interval_count_500ms = 0;
}
}
}
