Posted on May 10, 2016 at 00:44
[STDID[10:0] EXTID[17:0] IDE RTR 0] Therefore I need to shift std-ids by 20 digits left if the ide_bit is reset. Extended ids are shifted 3 digits left. Please have a look at my code snippet below. Is this the right way to do it? I can't receive any messages this way. Only extended IDs seem to work.
Hi there,
I'd like to use the can filters in 32bit list mode and add a std-id to it. Below is part of the code I'm using. basically my question is whether I can add std ids to a 32bit list-mode filter and how to shift the address bits accordingly? As per reference manual, the FR1/2 register contents are: [STDID[10:0] EXTID[17:0] IDE RTR 0] Therefore I need to shift std-ids by 20 digits left if the ide_bit is reset. Extended ids are shifted 3 digits left. Please have a look at my code snippet below. Is this the right way to do it? I can't receive any messages this way. Only extended IDs seem to work.void can_whitelist_add(CAN_HandleTypeDef* canhandle, unsigned long can_id, uint8_t ide_bit, uint8_t assign_fifo) {
assert_param(assign_fifo == CAN_FIFO0 || assign_fifo == CAN_FIFO1);
assert_param(can_id > 0 && can_id < 0x3FFFFFFF);
// ensure ide_bit is either 1 or 0
ide_bit = ide_bit > 0;
/*
* ----------
* Fresh filter bank
* ----------
*/
CAN_FilterConfTypeDef sFilterConfig;
sFilterConfig.FilterNumber = filter_index;
sFilterConfig.FilterMode = CAN_FILTERMODE_IDLIST;
sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
sFilterConfig.FilterIdHigh = (can_id << (3 + 17 * (1 - ide_bit))) >> 16; // place STD_ID in bits 19:31, EXT_ID in bits 3:31
sFilterConfig.FilterIdLow = (can_id << (3 + 17 * (1 - ide_bit)));
sFilterConfig.FilterIdLow ^= (-ide_bit ^ sFilterConfig.FilterIdLow) & (1 << 2); // set / reset IDE bit
sFilterConfig.FilterMaskIdHigh = 0x0000; //FR2 is empty, set to 0
sFilterConfig.FilterMaskIdLow = 0x0000; //FR2 is empty, set to 0
sFilterConfig.FilterFIFOAssignment = assign_fifo;
sFilterConfig.FilterActivation = ENABLE;
sFilterConfig.BankNumber = 26; // irrelevant if only using one can controller.
if (HAL_CAN_ConfigFilter(canhandle, &sFilterConfig) != HAL_OK) {
static uint8_t error = 0;
error++;
} #stm32-can-can-filter-list
