写一个stm32c8t6串口IAP升级程序

好的，下面是使用STM32C8T6实现串口IAP升级程序的示例代码，仅供参考：

#include "stm32c8t6.h"
#include <stdio.h>

#define APP_FLASH_BASE_ADDR 0x08008000 // App程序存储地址
#define IAP_FLASH_BASE_ADDR 0x08000000 // IAP程序存储地址
#define FLASH_PAGE_SIZE 1024 // Flash的页大小

/* 函数声明 */
void USART1_Config(void);
void Flash_Erase(uint32_t addr);
void Flash_Write(uint32_t addr, uint8_t *data, uint32_t size);

int main(void)
{
    USART1_Config(); // 配置串口
    printf("IAP Program Start\r\n");

    uint8_t data = 0;
    uint32_t iap_addr = IAP_FLASH_BASE_ADDR; // IAP程序存储地址

    while(1)
    {
        // 从串口接收数据
        while((USART1->SR & USART_SR_RXNE) == 0);
        data = USART1->DR;

        // 如果接收到的数据为0x7F，表示开始IAP升级
        if(data == 0x7F)
        {
            printf("Start IAP Program\r\n");

            // 擦除App程序
            Flash_Erase(APP_FLASH_BASE_ADDR);

            // 从IAP程序读取数据并写入App程序
            uint8_t buffer[FLASH_PAGE_SIZE];
            while(1)
            {
                for(uint32_t i = 0; i < FLASH_PAGE_SIZE; i++)
                {
                    while((USART1->SR & USART_SR_RXNE) == 0);
                    buffer[i] = USART1->DR;
                }

                Flash_Write(APP_FLASH_BASE_ADDR, buffer, FLASH_PAGE_SIZE);
                iap_addr += FLASH_PAGE_SIZE;

                // 如果读取到的数据结尾为0x7F，表示IAP升级结束
                if(buffer[FLASH_PAGE_SIZE - 1] == 0x7F)
                {
                    printf("IAP Program End\r\n");

                    // 跳转到App程序
                    void (*app_entry)(void) = (void (*)(void))(APP_FLASH_BASE_ADDR + 4);
                    app_entry();
                }
            }
        }
    }
}

/* USART1配置函数 */
void USART1_Config(void)
{
    RCC->APBENR |= RCC_APBENR_USART1EN; // 使能USART1时钟
    RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN; // 使能SYSCFG时钟
    SYSCFG->CFGR1 &= ~SYSCFG_CFGR1_USART1TX_DMA_RMP; // 关闭USART1 DMA传输映射

    // 配置USART1引脚
    GPIOA->MODER &= ~(GPIO_MODER_MODE9 | GPIO_MODER_MODE10);
    GPIOA->MODER |= GPIO_MODER_MODE9_1 | GPIO_MODER_MODE10_1;
    GPIOA->AFR[1] &= ~(GPIO_AFRH_AFSEL9 | GPIO_AFRH_AFSEL10);
    GPIOA->AFR[1] |= (1 << (1 * 4)) | (1 << (2 * 4));

    // 配置USART1
    USART1->CR1 &= ~USART_CR1_UE;
    USART1->CR1 &= ~(USART_CR1_M | USART_CR1_PCE | USART_CR1_PS);
    USART1->CR2 &= ~USART_CR2_STOP;
    USART1->CR1 &= ~USART_CR1_OVER8;
    USART1->BRR = 4000000 / 115200;
    USART1->CR1 |= USART_CR1_TE | USART_CR1_RE | USART_CR1_UE;
}

/* Flash擦除函数 */
void Flash_Erase(uint32_t addr)
{
    FLASH->KEYR = 0x45670123;
    FLASH->KEYR = 0xCDEF89AB;
    FLASH->CR |= FLASH_CR_PER;
    FLASH->AR = addr;
    FLASH->CR |= FLASH_CR_STRT;

    while((FLASH->SR & FLASH_SR_BSY) != 0);

    FLASH->CR &= ~FLASH_CR_PER;
}

/* Flash写入函数 */
void Flash_Write(uint32_t addr, uint8_t *data, uint32_t size)
{
    FLASH->KEYR = 0x45670123;
    FLASH->KEYR = 0xCDEF89AB;
    FLASH->CR |= FLASH_CR_PG;

    for(uint32_t i = 0; i < size; i++)
    {
        *(volatile uint8_t*)(addr + i) = data[i];

        while((FLASH->SR & FLASH_SR_BSY) != 0);

        if(*(volatile uint8_t*)(addr + i) != data[i])
        {
            printf("Flash Write Error: Addr=0x%08X, Data=0x%02X\r\n", addr + i, data[i]);
            return;
        }
    }

    FLASH->CR &= ~FLASH_CR_PG;
}

这是一个简单的串口IAP升级程序，通过USART1接收IAP程序数据并写入Flash，最后跳转到App程序。需要注意的是，此代码仅作为示例，具体实现需要根据实际需求进行修改和优化。