bxCan Filtering

[jgauthier]

I've been reading several forums posts about filtering, and other resources such as:

https://community.st.com/s/question/0D50X00009XkfSlSAJ/can-filters

https://blog.csdn.net/flydream0/article/details/52317532

I get the gist of this.

CAN_FilterIdHigh is the value to "compare" to.

CAN_FilterMaskIdHigh is the mask.

I wrote this small program to test this:

http://tpcg.io/EP29GQ

Using a range ox 0x2b0 - 02xbf

The program returns the values it should.

However, after setting it up, nothing is accepted:

void set_filter(void) {
	CAN_FilterTypeDef sFilterConfig;
	sFilterConfig.FilterBank = 0U;
	sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK;
	sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
 
	if (MYID == EJCC_UNASSIGNED) {
		sFilterConfig.FilterIdHigh = (0x2b0 & 0x7F0) << 5; 
		sFilterConfig.FilterIdLow = 0x0000U;
		sFilterConfig.FilterMaskIdHigh = 0x7f0 << 5;
		sFilterConfig.FilterMaskIdLow = 0x0000U;
	}
	sFilterConfig.FilterFIFOAssignment = CAN_RX_FIFO0;
	sFilterConfig.FilterActivation = ENABLE;
	HAL_CAN_ConfigFilter(&hcan1, &sFilterConfig);
 
}