提问人：brigadir 提问时间：10/1/2023 更新时间：10/5/2023 访问量：86
STM32 带双 CAN - 配置滤波器
STM32 with dual CAN - configure filters
问：
尝试在具有 2 个 CAN 总线的STM32F105上设置过滤器时寻求解决奇怪问题的帮助 - 16 位列表模式下的过滤器仅适用于前 2 个 bank。但同样的配置适用于具有单个CAN总线的STM32F103。
代码如下：
bool CanSetFilter(CAN_HandleTypeDef *can, uint8_t bank, uint16_t id1, uint16_t id2, uint16_t id3, uint16_t id4) {
return CanSetFilterList16bit(can, bank, (uint32_t(id1)<<21) | (uint32_t(id2)<<5), (uint32_t(id3)<<21) | (uint32_t(id4)<<5), CAN_FILTERMODE_IDLIST, CAN_FILTERSCALE_16BIT, CAN_FILTER_FIFO0);
}
bool CanSetFilterList16bit(CAN_HandleTypeDef *can, uint8_t bank_num, uint32_t filter_id, uint32_t mask, uint32_t filter_mode, uint32_t filter_scale, uint32_t fifo) {
CAN_FilterTypeDef sFilterConfig;
sFilterConfig.FilterBank = bank_num;
sFilterConfig.FilterMode = filter_mode;
sFilterConfig.FilterScale = filter_scale;
sFilterConfig.FilterFIFOAssignment = fifo;
sFilterConfig.FilterActivation = ENABLE;
sFilterConfig.FilterIdHigh = filter_id&0xFFFF;
sFilterConfig.FilterIdLow = filter_id>>16;
sFilterConfig.FilterMaskIdHigh = mask&0xFFFF;
sFilterConfig.FilterMaskIdLow = mask>>16;
bool result = (HAL_CAN_ConfigFilter(can, &sFilterConfig ) == HAL_OK);
return result;
}
// and apply filters:
uint16_t canFilterIds[] = {
0x076, 0x077, 0x07D, 0x167,
0x171, 0x204, 0x213, 0x217,
0x230, 0x3B3, 0x42F, 0x43E, // < this goes to bank 3 and doesn't work in result
};
const int canFiltersCount = sizeof(canFilterIds) / sizeof(canFilterIds[0]);
int filter = 0;
for (int i=0; (i<canFiltersCount) && (filter<28); filter++) {
uint32_t f1 = (i<canFiltersCount) ? canFilterIds[i++] : canFilterIds[i];
uint32_t f2 = (i<canFiltersCount) ? canFilterIds[i++] : canFilterIds[i];
uint32_t f3 = (i<canFiltersCount) ? canFilterIds[i++] : canFilterIds[i];
uint32_t f4 = (i<canFiltersCount) ? canFilterIds[i++] : canFilterIds[i];
CanSetFilter(&hcan1, filter, f1, f2, f3, f4);
}
我看到在调试模式下，所有三个调用都成功了。以下是相应的结果：CanSetFilter(...)CAN_FilterTypeDef
我不知道问题出在哪里，所以如果有人有工作的例子或遇到过这个问题，请期待。
答：
0赞
brigadir
10/5/2023
#1
好的，问题出在CAN 2的过滤器初始化上。应该禁用我设置的过滤器。它会导致不正确的行为。当我把它改成它时，效果很好。
这是 CAN2 总线的过滤器初始化代码，它禁用了对其的过滤，但保持过滤器为 CAN1 工作，也许对某人有所帮助。sFilterConfig.FilterBank = 27;sFilterConfig.FilterBank = 0;
CAN_FilterTypeDef sFilterConfig;
sFilterConfig.FilterBank = 0;
sFilterConfig.FilterActivation = CAN_FILTER_DISABLE;
sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK;
sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
sFilterConfig.FilterIdHigh = 0x0000;
sFilterConfig.FilterIdLow = 0x0000;
sFilterConfig.FilterMaskIdHigh = 0x0000;
sFilterConfig.FilterMaskIdLow = 0x0000;
sFilterConfig.FilterFIFOAssignment = CAN_RX_FIFO1;
sFilterConfig.FilterActivation = ENABLE;
sFilterConfig.SlaveStartFilterBank = 28;
HAL_result = HAL_CAN_ConfigFilter(&hcan2, &sFilterConfig);
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