STM32G474 FDCAN 中断收发代码示例
时间: 2023-07-09 15:32:58 浏览: 231
以下是基于STM32G474的FDCAN中断收发代码示例:
首先需要配置FDCAN的时钟和GPIO引脚,然后配置FDCAN中断并初始化FDCAN。下面是一个简单的例子:
```c
#include "stm32g4xx_hal.h"
#include "stm32g4xx_hal_fdcan.h"
/* FDCAN handle structure */
FDCAN_HandleTypeDef hfdcan1;
/* FDCAN RX message structure */
FDCAN_RxHeaderTypeDef RxHeader;
uint8_t RxData[8];
/* FDCAN TX message structure */
FDCAN_TxHeaderTypeDef TxHeader;
uint8_t TxData[8];
/* FDCAN interrupt callback function */
void HAL_FDCAN_RxFifo0Callback(FDCAN_HandleTypeDef *hfdcan)
{
/* Get RX message */
HAL_FDCAN_GetRxMessage(hfdcan, FDCAN_RX_FIFO0, &RxHeader, RxData);
/* Process RX message */
// ...
}
void HAL_FDCAN_TxBufferCompleteCallback(FDCAN_HandleTypeDef *hfdcan, uint32_t BufferIndexes)
{
/* Process TX message */
// ...
}
/* FDCAN initialization function */
void FDCAN_Init(void)
{
/* FDCAN clock enable */
__HAL_RCC_FDCAN_CLK_ENABLE();
/* FDCAN GPIO configuration */
// ...
/* FDCAN interrupt configuration */
HAL_NVIC_SetPriority(FDCAN1_IT0_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(FDCAN1_IT0_IRQn);
/* FDCAN initialization */
hfdcan1.Instance = FDCAN1;
hfdcan1.Init.ClockDivider = FDCAN_CLOCK_DIV1;
hfdcan1.Init.FrameFormat = FDCAN_FRAME_CLASSIC;
hfdcan1.Init.Mode = FDCAN_MODE_NORMAL;
hfdcan1.Init.AutoRetransmission = ENABLE;
hfdcan1.Init.TransmitPause = DISABLE;
hfdcan1.Init.ProtocolException = ENABLE;
hfdcan1.Init.NominalPrescaler = 1;
hfdcan1.Init.NominalSyncJumpWidth = 1;
hfdcan1.Init.NominalTimeSeg1 = 13;
hfdcan1.Init.NominalTimeSeg2 = 2;
hfdcan1.Init.DataPrescaler = 1;
hfdcan1.Init.DataSyncJumpWidth = 1;
hfdcan1.Init.DataTimeSeg1 = 13;
hfdcan1.Init.DataTimeSeg2 = 2;
hfdcan1.Init.StdFiltersNbr = 1;
hfdcan1.Init.ExtFiltersNbr = 0;
hfdcan1.Init.TxFifoQueueMode = FDCAN_TX_FIFO_OPERATION;
hfdcan1.Init.TxFifoQueueSize = 1;
hfdcan1.Init.RxFifo0Operation = FDCAN_RX_FIFO_OPERATION;
hfdcan1.Init.RxFifo0Size = 1;
hfdcan1.Init.RxFifo0ElmtsNbr = 1;
hfdcan1.Init.RxFifo1Operation = DISABLE;
hfdcan1.Init.RxFifo1Size = 0;
hfdcan1.Init.RxFifo1ElmtsNbr = 0;
hfdcan1.Init.TxEventFifoOperation = DISABLE;
hfdcan1.Init.TxEventFifoSize = 0;
hfdcan1.Init.TxEventFifoElmtsNbr = 0;
HAL_FDCAN_Init(&hfdcan1);
/* FDCAN filter configuration */
FDCAN_FilterTypeDef filter;
filter.IdType = FDCAN_STANDARD_ID;
filter.FilterIndex = 0;
filter.FilterType = FDCAN_FILTER_MASK;
filter.FilterConfig = FDCAN_FILTER_TO_RXFIFO0;
filter.FilterID1 = 0x111;
filter.FilterMask1 = 0x7FF;
filter.FilterID2 = 0x000;
filter.FilterMask2 = 0x7FF;
HAL_FDCAN_ConfigFilter(&hfdcan1, &filter);
}
/* FDCAN transmit function */
void FDCAN_Transmit(void)
{
/* FDCAN message transmission */
TxHeader.Identifier = 0x111;
TxHeader.IdType = FDCAN_STANDARD_ID;
TxHeader.TxFrameType = FDCAN_DATA_FRAME;
TxHeader.DataLength = FDCAN_DLC_BYTES_8;
TxHeader.ErrorStateIndicator = FDCAN_ESI_ACTIVE;
TxHeader.BitRateSwitch = FDCAN_BRS_OFF;
TxHeader.FDFormat = FDCAN_CLASSIC_CAN;
TxHeader.TxEventFifoControl = FDCAN_NO_TX_EVENTS;
TxHeader.MessageMarker = 0;
TxData[0] = 0x55;
TxData[1] = 0xAA;
TxData[2] = 0x55;
TxData[3] = 0xAA;
TxData[4] = 0x55;
TxData[5] = 0xAA;
TxData[6] = 0x55;
TxData[7] = 0xAA;
HAL_FDCAN_AddMessageToTxFifoQ(&hfdcan1, &TxHeader, TxData);
}
int main(void)
{
/* FDCAN initialization */
FDCAN_Init();
/* FDCAN message transmission */
FDCAN_Transmit();
/* Infinite loop */
while (1)
{
// ...
}
}
```
在上面的代码中,我们定义了一个FDCAN句柄结构体,一个FDCAN RX消息结构体和一个FDCAN TX消息结构体。然后,在FDCAN初始化函数中,我们配置了FDCAN的时钟和GPIO引脚,配置了FDCAN中断,并初始化了FDCAN。在FDCAN初始化完成后,我们可以在主函数中调用FDCAN_Transmit函数来发送FDCAN消息。
在FDCAN中,我们需要使用中断来处理接收和发送操作。因此,在FDCAN初始化函数中,我们注册了两个回调函数:HAL_FDCAN_RxFifo0Callback和HAL_FDCAN_TxBufferCompleteCallback。当FDCAN RX FIFO0中有新的消息时,HAL_FDCAN_RxFifo0Callback函数将被调用。在HAL_FDCAN_TxBufferCompleteCallback函数中,我们可以处理FDCAN TX消息的结果。
请注意,上面的代码仅提供了一个FDCAN中断收发的框架。具体实现需要根据具体的应用进行修改和优化。
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