stm32f103can通信
时间: 2023-08-04 19:02:25 浏览: 56
STM32F103系列微控制器的CAN通信是通过内部的CAN控制器实现的。CAN(Controller Area Network)是一种高性能、实时性强的串行通信协议,常用于工业自动化、汽车电子等领域。
要使用STM32F103的CAN通信功能,首先需要配置相关的引脚和寄存器。以下是一个简单的示例代码,演示了如何配置和发送CAN消息:
```c
#include "stm32f10x.h"
void CAN_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
CAN_InitTypeDef CAN_InitStructure;
// 开启CAN时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
// 配置CAN引脚
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// CAN初始化
CAN_DeInit(CAN1);
CAN_StructInit(&CAN_InitStructure);
CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
CAN_InitStructure.CAN_BS1 = CAN_BS1_3tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_2tq;
CAN_InitStructure.CAN_Prescaler = 4; // 波特率预分频值,根据实际需求调整
CAN_Init(CAN1, &CAN_InitStructure);
// 配置过滤器
CAN_FilterInitTypeDef CAN_FilterInitStructure;
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;
CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);
}
void CAN_SendMessage(uint32_t id, uint8_t* data, uint8_t len)
{
CanTxMsg TxMessage;
TxMessage.StdId = id; // 标准帧ID
TxMessage.ExtId = 0; // 扩展帧ID
TxMessage.IDE = CAN_Id_Standard; // 使用标准帧
TxMessage.RTR = CAN_RTR_Data; // 数据帧
TxMessage.DLC = len; // 数据长度
for (uint8_t i = 0; i < len; i++) {
TxMessage.Data[i] = data[i]; // 数据内容
}
uint8_t mbox;
mbox = CAN_Transmit(CAN1, &TxMessage); // 发送消息
while (CAN_TransmitStatus(CAN1, mbox) == CAN_TxStatus_Failed); // 等待发送完成
}
```
这是一个简单的CAN通信配置和发送函数的示例代码,你可以根据自己的实际需求进行修改和扩展。在使用CAN通信时,还需要配置中断或轮询方式来接收CAN消息,以及处理接收到的消息数据。