stm32f中can通信
时间: 2023-09-08 20:11:31 浏览: 93
在STM32F系列微控制器中,CAN总线是一种非常常用的通信接口。下面是使用CAN总线进行通信的基本步骤:
1. 初始化CAN总线:设置CAN总线的工作模式、波特率等参数。
2. 配置CAN总线的发送和接收邮箱:CAN总线通过邮箱进行数据的发送和接收,需要配置邮箱的ID、数据长度等参数。
3. 发送数据:将要发送的数据写入邮箱,并发送出去。
4. 接收数据:从邮箱中读取接收到的数据。
以下是一个简单的示例代码,演示了如何使用STM32F系列微控制器中的CAN总线进行数据的发送和接收。
```
#include "stm32f10x.h"
#include "stm32f10x_can.h"
void CAN_Configuration(void)
{
CAN_InitTypeDef can_init;
CAN_FilterInitTypeDef can_filter_init;
// 打开CAN总线的时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
// 初始化CAN总线的参数
can_init.CAN_TTCM = DISABLE;
can_init.CAN_ABOM = DISABLE;
can_init.CAN_AWUM = DISABLE;
can_init.CAN_NART = DISABLE;
can_init.CAN_RFLM = DISABLE;
can_init.CAN_TXFP = ENABLE;
can_init.CAN_Mode = CAN_Mode_Normal;
can_init.CAN_SJW = CAN_SJW_1tq;
can_init.CAN_BS1 = CAN_BS1_9tq;
can_init.CAN_BS2 = CAN_BS2_8tq;
can_init.CAN_Prescaler = 2;
CAN_Init(CAN1, &can_init);
// 配置CAN总线的过滤器
can_filter_init.CAN_FilterNumber = 0;
can_filter_init.CAN_FilterMode = CAN_FilterMode_IdMask;
can_filter_init.CAN_FilterScale = CAN_FilterScale_32bit;
can_filter_init.CAN_FilterIdHigh = 0x0000;
can_filter_init.CAN_FilterIdLow = 0x0000;
can_filter_init.CAN_FilterMaskIdHigh = 0x0000;
can_filter_init.CAN_FilterMaskIdLow = 0x0000;
can_filter_init.CAN_FilterFIFOAssignment = 0;
can_filter_init.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&can_filter_init);
}
void CAN_SendData(uint32_t id, uint8_t* data, uint8_t len)
{
CanTxMsg tx_message;
tx_message.StdId = id;
tx_message.RTR = CAN_RTR_Data;
tx_message.IDE = CAN_Id_Standard;
tx_message.DLC = len;
for (int i = 0; i < len; i++)
{
tx_message.Data[i] = data[i];
}
CAN_Transmit(CAN1, &tx_message);
}
void CAN_ReceiveData(void)
{
CanRxMsg rx_message;
if (CAN_MessagePending(CAN1, CAN_FIFO0) > 0)
{
CAN_Receive(CAN1, CAN_FIFO0, &rx_message);
// 处理接收到的数据
}
}
int main(void)
{
CAN_Configuration();
uint8_t data[] = {1, 2, 3};
CAN_SendData(0x123, data, 3);
while (1)
{
CAN_ReceiveData();
}
}
```
在这个例子中,首先对CAN总线进行了初始化,并配置了一个过滤器来过滤接收到的数据。然后,在主函数中,通过CAN_SendData函数向CAN总线发送数据,并通过CAN_ReceiveData函数接收数据。当接收到数据后,可以在CAN_ReceiveData函数中处理数据。
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