stc89c52和stm32f103vet6can通讯代码

这里提供一个简单的示例代码，展示如何在STC89C52和STM32F103VE之间使用CAN通信：

STC89C52代码：

#include <REG52.H>
#include <intrins.h>

#define CAN_SPEED 250000   // CAN总线速率

sbit P1_0 = P1^0;   // LED指示灯

unsigned char Can_Init_Flags;   // CAN初始化标志
unsigned char Can_Rx_Msg_Flags;   // CAN消息接收标志
unsigned char Can_Tx_Msg_Flags;   // CAN消息发送标志
unsigned char Can_Err_Msg_Flags;   // CAN错误消息标志
unsigned char Can_Msg_Priority;   // CAN消息优先级
unsigned char Can_Msg_Length;   // CAN消息长度
unsigned char Can_Msg_Data[8];   // CAN消息数据

// CAN初始化函数
void Can_Init() {
    Can_Init_Flags = 0;
    
    // P1.0配置为输出
    P1_0 = 0;
    
    // 定时器0初始化
    TMOD &= 0xF0;
    TMOD |= 0x01;
    TH0 = 0xFC;
    TL0 = 0x67;
    ET0 = 1;
    TR0 = 1;
    
    // CAN初始化
    Can_Init_Flags = CAN_Init_Mode(CAN_SPEED);
    
    if (Can_Init_Flags == 0x00) {
        P1_0 = 1;   // 初始化成功，LED指示灯亮
    } else {
        P1_0 = 0;   // 初始化失败，LED指示灯灭
    }
}

// CAN消息接收函数
void Can_Receive_Msg() {
    Can_Rx_Msg_Flags = CAN_Rx_Msg(&Can_Msg_Priority, &Can_Msg_Length, Can_Msg_Data);
    
    if (Can_Rx_Msg_Flags == 0x00) {
        if (Can_Msg_Length == 1 && Can_Msg_Data[0] == 0x01) {
            P1_0 = 1;   // 接收到0x01，LED指示灯亮
        } else {
            P1_0 = 0;   // 接收到其他数据，LED指示灯灭
        }
    }
}

// CAN消息发送函数
void Can_Transmit_Msg() {
    Can_Tx_Msg_Flags = CAN_Tx_Msg(Can_Msg_Priority, Can_Msg_Length, Can_Msg_Data);
    
    if (Can_Tx_Msg_Flags == 0x00) {
        P1_0 = 1;   // 发送成功，LED指示灯亮
    } else {
        P1_0 = 0;   // 发送失败，LED指示灯灭
    }
}

// 定时器0中断函数
void Timer0_ISR() interrupt 1 {
    Can_Receive_Msg();   // 接收CAN消息
}

// 主函数
void main() {
    Can_Init();   // CAN初始化
    
    while (1) {
        Can_Msg_Priority = 0x00;   // CAN消息优先级
        Can_Msg_Length = 1;   // CAN消息长度
        Can_Msg_Data[0] = 0x01;   // CAN消息数据
        Can_Transmit_Msg();   // 发送CAN消息
        Delay50ms();   // 延时50ms
    }
}

STM32F103VE代码：

#include "stm32f10x.h"

#define CAN_SPEED 250000   // CAN总线速率

GPIO_InitTypeDef GPIO_InitStructure;   // GPIO初始化结构体
CAN_InitTypeDef CAN_InitStructure;   // CAN初始化结构体
CAN_FilterInitTypeDef CAN_FilterInitStructure;   // CAN过滤器初始化结构体
CanTxMsg TxMessage;   // CAN发送消息结构体
CanRxMsg RxMessage;   // CAN接收消息结构体

// 延时函数
void Delay(uint32_t nCount) {
    for(; nCount != 0; nCount--);
}

// GPIO初始化函数
void GPIO_Configuration(void) {
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);   // 使能GPIOA时钟

    // PA11(CAN1-Rx)、PA12(CAN1-Tx)配置为复用推挽输出
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
}

// CAN初始化函数
void CAN_Configuration(void) {
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);   // 使能CAN1时钟

    // CAN1初始化
    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_6tq;
    CAN_InitStructure.CAN_BS2 = CAN_BS2_8tq;
    CAN_InitStructure.CAN_Prescaler = 16;
    CAN_Init(CAN1, &CAN_InitStructure);

    // CAN过滤器初始化
    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);

    // CAN中断配置
    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    // CAN接收中断使能
    CAN_ITConfig(CAN1, CAN_IT_FMP0, ENABLE);
}

// 发送CAN消息函数
void CAN_Send_Msg(uint8_t *Data, uint8_t DataLength) {
    TxMessage.StdId = 0x123;
    TxMessage.ExtId = 0;
    TxMessage.IDE = CAN_Id_Standard;
    TxMessage.RTR = CAN_RTR_Data;
    TxMessage.DLC = DataLength;
    for (int i = 0; i < DataLength; i++) {
        TxMessage.Data[i] = Data[i];
    }
    CAN_Transmit(CAN1, &TxMessage);
}

// 接收CAN消息函数
void USB_LP_CAN1_RX0_IRQHandler(void) {
    CAN_Receive(CAN1, CAN_FIFO0, &RxMessage);
    if (RxMessage.StdId == 0x123 && RxMessage.IDE == CAN_Id_Standard && RxMessage.DLC == 1 && RxMessage.Data[0] == 0x01) {
        GPIO_WriteBit(GPIOA, GPIO_Pin_0, Bit_SET);   // 接收到0x01，PA0输出高电平
    } else {
        GPIO_WriteBit(GPIOA, GPIO_Pin_0, Bit_RESET);   // 接收到其他数据，PA0输出低电平
    }
}

// 主函数
int main(void) {
    // GPIO初始化
    GPIO_Configuration();

    // CAN初始化
    CAN_Configuration();

    // 发送CAN消息
    uint8_t Data[] = {0x01};
    while (1) {
        CAN_Send_Msg(Data, sizeof(Data));
        Delay(0xFFFFF);   // 延时
    }
}

注意：本示例代码中，STC89C52使用P1.0作为LED指示灯，STM32F103VE使用PA0作为LED指示灯，需要根据自己的硬件连接情况进行修改。此外，还需要在STM32F103VE的`stm32f10x_it.c`文件中添加CAN接收中断处理函数。