關(guān)于STM32中CAN1_RX0_IRQn和CAN1_RX1_IRQn的使用

以上內(nèi)容參考于網(wǎng)絡(luò)，后經(jīng)證實，以上說法是不正確的，理由如下：

STM32有2個3級深度的接收緩沖區(qū)：FIFO0和FIFO1，每個FIFO都可以存放3個完整的報文，它們完全由硬件來管理。如果是來自FIFO0的接收中斷，則用CAN1_RX0_IRQn中斷來處理。如果是來自FIFO1的接收中斷，則用CAN1_RX1_IRQn中斷來處理。在CAN的初始化配置過程中，用CAN_FilterFIFOAssignment來選擇要使用FIFO。

示例如下：

1. 配置過濾器
CAN_FilterInitStructure.CAN_FilterNumber = 0;

CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask;

CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_32bit;

CAN_FilterInitStructure.CAN_FilterIdHigh = 0x0000;

CAN_FilterInitStructure.CAN_FilterIdLow = 0x0000;

CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x0000;

CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0x0000;

CAN_FilterInitStructure.CAN_FilterFIFOAssignment = 0; //關(guān)聯(lián)FIFO0

CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;

CAN_FilterInit(&CAN_FilterInitStructure);

CAN_FilterInitStructure.CAN_FilterNumber = 14;

CAN_FilterInitStructure.CAN_FilterFIFOAssignment = 1; //關(guān)聯(lián)FIFO1

CAN_FilterInit(&CAN_FilterInitStructure);

2. 開啟CAN中斷

/* IT Configuration for CAN1 */

CAN_ITConfig(CAN1, CAN_IT_FMP0, ENABLE);

CAN_ITConfig(CAN1, CAN_IT_FMP1, ENABLE);

/* IT Configuration for CAN2 */

CAN_ITConfig(CAN2, CAN_IT_FMP0, ENABLE);

CAN_ITConfig(CAN2, CAN_IT_FMP1, ENABLE);

3. 中斷處理函數(shù)

void CAN1_RX0_IRQHandler(void)

{
CAN_Receive(CAN1, CAN_FIFO0, &CAN1_RxMsg);

//
}

void CAN1_RX1_IRQHandler(void)

{
CAN_Receive(CAN1, CAN_FIFO1, &CAN1_RxMsg);

//
}

void CAN2_RX0_IRQHandler(void)

{

CAN_Receive(CAN2, CAN_FIFO0, &CAN2_RxMsg);
//
}

void CAN2_RX1_IRQHandler(void)

{
CAN_Receive(CAN2, CAN_FIFO1, &CAN2_RxMsg);
//
}