那能帮我写一个基于stm32f103c8t6单片机的can通讯回环模式点灯代码么

以下是基于STM32F103C8T6单片机的CAN通讯回环模式点灯代码：

#include "stm32f10x.h"

#define LED_PIN GPIO_Pin_13
#define LED_PORT GPIOC

void GPIO_Configuration(void);
void CAN_Configuration(void);
void SysTick_Configuration(void);

int main(void)
{
    GPIO_Configuration();
    CAN_Configuration();
    SysTick_Configuration();

    while (1)
    {
        GPIO_SetBits(LED_PORT, LED_PIN);   // 点亮LED
        Delay(1000);                        // 延时1秒
        GPIO_ResetBits(LED_PORT, LED_PIN); // 熄灭LED
        Delay(1000);                        // 延时1秒
    }
}

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); // 使能GPIOC时钟

    GPIO_InitStructure.GPIO_Pin = LED_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(LED_PORT, &GPIO_InitStructure);
}

void CAN_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    CAN_InitTypeDef CAN_InitStructure;
    CAN_FilterInitTypeDef CAN_FilterInitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); // 使能AFIO时钟
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE); // 使能CAN1时钟

    // 配置CAN引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 初始化CAN
    CAN_DeInit(CAN1);
    CAN_StructInit(&CAN_InitStructure);
    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_4tq;
    CAN_InitStructure.CAN_BS2 = CAN_BS2_3tq;
    CAN_InitStructure.CAN_Prescaler = 4; // CAN时钟预分频系数为4，得到APB1时钟频率36MHz/(1+1)*4=18MHz
    CAN_Init(CAN1, &CAN_InitStructure);

    // 配置CAN过滤器
    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 = CAN_FIFO0;
    CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
    CAN_FilterInit(&CAN_FilterInitStructure);

    // 配置CAN中断
    NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    // 启动CAN
    CAN_ITConfig(CAN1, CAN_IT_FMP0, ENABLE);
    CAN_ITConfig(CAN1, CAN_IT_TME, ENABLE);
    CAN_ITConfig(CAN1, CAN_IT_EWG, ENABLE);
    CAN_ITConfig(CAN1, CAN_IT_EPV, ENABLE);
    CAN_ITConfig(CAN1, CAN_IT_BOF, ENABLE);
    CAN_ITConfig(CAN1, CAN_IT_LEC, ENABLE);
}

void SysTick_Configuration(void)
{
    if(SysTick_Config(SystemCoreClock / 1000)) // 配置SysTick定时器
    {
        while(1);
    }

    NVIC_SetPriority(SysTick_IRQn, 0x00); // 设置SysTick中断优先级为最高
}

void SysTick_Handler(void)
{
    static uint8_t cnt = 0;
    static CanTxMsg TxMessage;

    if (cnt++ >= 10) // 每100ms发送一次CAN消息
    {
        cnt = 0;

        TxMessage.StdId = 0x11;         // 标准ID为0x11
        TxMessage.ExtId = 0x00;         // 扩展ID为0
        TxMessage.RTR = CAN_RTR_DATA;   // 数据帧
        TxMessage.IDE = CAN_ID_STD;     // 标准ID
        TxMessage.DLC = 1;              // 数据长度为1字节
        TxMessage.Data[0] = 0xFF;       // 数据为0xFF

        CAN_Transmit(CAN1, &TxMessage); // 发送CAN消息
    }
}

void USB_LP_CAN1_RX0_IRQHandler(void)
{
    CanRxMsg RxMessage;

    CAN_Receive(CAN1, CAN_FIFO0, &RxMessage); // 接收CAN消息

    if (RxMessage.StdId == 0x11 && RxMessage.Data[0] == 0xFF) // 判断CAN消息是否为期望的消息
    {
        GPIO_SetBits(LED_PORT, LED_PIN);   // 点亮LED
    }
}

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

该代码实现了以下功能：

1. 点亮PC13上的LED灯，每隔1秒熄灭一次。
2. 通过CAN1发送标准ID为0x11、数据为0xFF的CAN消息，每隔100ms发送一次。
3. 通过CAN1接收标准ID为0x11、数据为0xFF的CAN消息，并在接收到消息时点亮LED灯。

注意事项：

1. 由于CAN通讯需要连接两个节点，因此需要使用CAN转接板或将另一个STM32F103C8T6单片机作为CAN节点与本单片机连接。
2. 本代码使用的CAN通讯模式为回环模式，即发送的CAN消息会被本节点自动接收并处理，因此只需要连接一个单片机即可测试CAN通讯功能。
3. 本代码使用的CAN时钟预分频系数为4，得到APB1时钟频率36MHz/(1+1)*4=18MHz，如果使用其他预分频系数需要相应调整CAN_InitTypeDef结构体中的CAN_Prescaler成员。