基于stm32f103的can通信电路
时间: 2023-08-16 22:07:15 浏览: 139
基于STM32F103的CAN通信电路可以参考以下步骤:
1. 连接CAN收发器:将CAN收发器的CANH、CANL引脚连接到STM32F103的CAN1对应的引脚,同时将CAN收发器的VCC和GND引脚连接到电源和地。
2. 配置GPIO:设置CAN1对应的GPIO引脚为复用模式,并使能GPIO时钟。
3. 配置CAN控制器:配置CAN控制器的时序参数和工作模式,并使能CAN时钟。
4. 配置中断:如果需要使用中断方式进行CAN数据接收,则需要配置CAN中断,并编写中断处理函数。
5. 编写CAN数据发送和接收代码:编写CAN数据发送和接收代码,并测试通信是否正常。
下面是一个简单的CAN数据发送和接收的代码示例:
```c
#include "stm32f10x.h"
#define CAN1_TX_GPIO_PORT GPIOB
#define CAN1_TX_GPIO_PIN GPIO_Pin_9
#define CAN1_TX_GPIO_CLK RCC_APB2Periph_GPIOB
#define CAN1_RX_GPIO_PORT GPIOB
#define CAN1_RX_GPIO_PIN GPIO_Pin_8
#define CAN1_RX_GPIO_CLK RCC_APB2Periph_GPIOB
#define CAN1_CLK RCC_APB1Periph_CAN1
void CAN_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
/* Enable CAN1 and GPIO clocks */
RCC_APB1PeriphClockCmd(CAN1_CLK, ENABLE);
RCC_APB2PeriphClockCmd(CAN1_TX_GPIO_CLK | CAN1_RX_GPIO_CLK, ENABLE);
/* Configure CAN1 RX and TX pins */
GPIO_InitStructure.GPIO_Pin = CAN1_TX_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(CAN1_TX_GPIO_PORT, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = CAN1_RX_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(CAN1_RX_GPIO_PORT, &GPIO_InitStructure);
/* CAN1 configuration */
CAN_InitStructure.CAN_TTCM = DISABLE;
CAN_InitStructure.CAN_ABOM = DISABLE;
CAN_InitStructure.CAN_AWUM = DISABLE;
CAN_InitStructure.CAN_NART = DISABLE;
CAN_InitStructure.CAN_RFLM = DISABLE;
CAN_InitStructure.CAN_TXFP = DISABLE;
CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
CAN_InitStructure.CAN_BS1 = CAN_BS1_5tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_2tq;
CAN_InitStructure.CAN_Prescaler = 4;
CAN_Init(CAN1, &CAN_InitStructure);
/* CAN filter configuration */
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_SendData(uint16_t id, uint8_t* data, uint8_t len)
{
CanTxMsg TxMessage;
uint8_t i;
TxMessage.StdId = id;
TxMessage.ExtId = 0;
TxMessage.RTR = CAN_RTR_DATA;
TxMessage.IDE = CAN_ID_STD;
TxMessage.DLC = len;
for (i = 0; i < len; ++i) {
TxMessage.Data[i] = data[i];
}
CAN_Transmit(CAN1, &TxMessage);
}
void CAN_ReceiveData(CanRxMsg* RxMessage)
{
while (CAN_MessagePending(CAN1, CAN_FIFO0) == 0);
CAN_Receive(CAN1, CAN_FIFO0, RxMessage);
}
int main(void)
{
CanRxMsg RxMessage;
CAN_Config();
while (1) {
/* Send data */
uint8_t data[8] = {0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0};
CAN_SendData(0x123, data, 8);
/* Receive data */
CAN_ReceiveData(&RxMessage);
if (RxMessage.StdId == 0x456) {
/* Do something with the received data */
}
}
}
```
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