基于stm32f103的can通信电路

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：

#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 */
        }
    }
}