FYI's I found a bug in the IMX6SX FreeRTOS BSP v.1.0.0 flexcan driver. Interrupt registers for message buffers > 31 are not addressed correctly, meaning getting, setting or clearing interrupts on message boxes with an ID > 31 doesn't work.
In ./platform/drivers/src/flexcan.c the following functions
FLEXCAN_SetMsgBufIntCmd
FLEXCAN_GetMsgBufStatusFlag
FLEXCAN_ClearMsgBufStatusFlag
when checking the message buffer id the hex value 0x31 is used,but it should be decimal 31. In FLEXCAN_ClearMsgBufStatusFlag only IFLAG1 is assigned, ignoring IFLAG2.
E.g. existing
void FLEXCAN_ClearMsgBufStatusFlag(CAN_Type* base, uint32_t msgBufIdx)
{
volatile uint8_t index;
assert(msgBufIdx < CAN_CS_COUNT);
if (msgBufIdx > 0x31)
index = msgBufIdx - 32;
else
index = msgBufIdx;
/* The Interrupt flag must be cleared by writing it to '1'.
* Writing '0' has no effect.
*/
base->IFLAG1 = 0x1 << index;
}
should be
void FLEXCAN_ClearMsgBufStatusFlag(CAN_Type* base, uint32_t msgBufIdx)
{
volatile uint8_t index;
volatile uint32_t* interruptFlagPtr;
assert(msgBufIdx < CAN_CS_COUNT);
if (msgBufIdx > 31) {
index = msgBufIdx - 32;
interruptFlagPtr = &base->IFLAG2;
}
else {
index = msgBufIdx;
interruptFlagPtr = &base->IFLAG1;
}
/* The Interrupt flag must be cleared by writing it to '1'.
* Writing '0' has no effect.
*/
*interruptMaskPtr |= 0x1 << index;
}
