Resetting IT Pending bit for CAN interrupt

[orlandospac]

Posted on April 03, 2014 at 08:27

Hello,

i am working with a STM32f103 with the integrated CAN controller and i use the std. periph library. In the function

CAN_ClearITPendingBit(CAN1, CAN_IT_BOF);

the entire CAN_MSR register will be overwritten but not the ERRI bit.

case CAN_IT_BOF: 
/* Clear CAN_MSR_ERRI (rc_w1) */ 
CANx->MSR = CAN_MSR_ERRI; 
/* Note : the corresponding Flag is cleared by hardware depending 
of the CAN Bus status*/

CAN_MSR_ERRI is 0x0004;

Inthe reference manual at bit descriction of ERRI of the CAN_MSR register i can read ''This bit is cleared by software''. An in the code documentation of the std. per. lib. is also written ''Clear CAN_MSR_ERRI''. Is this a bug? Can i use the function CAN_ClearITPendingBit(CAN1, CAN_IT_BOF); in the BusOff ISR? Thanks!!