接上一篇文章：单Bank OTA升级：STM32G071 BootLoader (一)：跳转链接

什么是单Bank升级：将Flash划分为以下3个区域。

BootLoader区：程序进行升级的引导程序，根据Upade_Flag来判断跳转Bank区运行程序或是接收升级数据写入Bank，接收完成后擦写Upade_Flag区，进行跳转Bank区运行程序。

Upade_Flag区：判断BootLoader是否能跳转IAP程序的标志位。

Bank区：用户程序区。

IAP程序只需要在BootLoader的基础上进行如下修改

对程序起始地址和内存大小进行设置。

 main.c文件

int main(void)
{
    SCB->VTOR = FLASH_APP_ADDR;

    HAL_Init();
    SystemClock_Config();
    MX_GPIO_Init();
    MX_USART1_UART_Init();
    MX_USART2_UART_Init();
    ClearRxQueue();
    
    printf("IAP Code \r\n");
    
    while (1)
    {
        Usart_Data_Handler();
    }
}

 Update.c文件

bool Usart_Data_Handler(void)
{
    static uint8_t Data;
    static uint8_t Cmd;
    static uint8_t Check;
    static uint8_t Send_Data[10];
    static uint16_t Update_Pack_Num;
    static uint16_t Update_Pack_Num_Temp;
    static uint32_t Update_Data_Len;
    static uint32_t Write_Date_Len;
        
    static uint16_t Receive_Data_Len;
    static uint16_t Receive_Data_Count;
     
    
    while(GetRxQueueLen() > 0)
    {	
        Data = GetRxQueueData();
        
        if(Receiver_State == RECEIVER_HEAD_H)
        {
            if(Data == 0x55)
            {
                Receiver_State++;
            }
        }
        else if(Receiver_State == RECEIVER_HEAD_L)
        {
            if(Data == 0x55)
            {
                Receiver_State++;
            }
        }
        else if(Receiver_State == RECEIVER_CMD)
        {
            Receiver_State++;
            Receive_Data_Len = 0;
            Receive_Data_Count = 0;
            Cmd = Data;
            if(Cmd == 0x00)
            {
                Erase_Updata_Flag_Flash();
                printf("Erase_Updata_Flag_Flash \r\n");
                NVIC_SystemReset();
            }    
        }
        else if(Receiver_State == RECEIVER_LEN_H)
        {
            Receiver_State++;

        }
        else if(Receiver_State == RECEIVER_LEN_L)
        {
            Receiver_State++;
        }
        else if(Receiver_State == RECEIVER_DATA)
        {
            if(Receive_Data_Count == Receive_Data_Len)
            {
                Receiver_State++;
            }
        }
        else if(Receiver_State == RECEIVER_CHECK)
        {
            Receiver_State = RECEIVER_HEAD_H;
        }
    }
}

上位机升级工具：升级工具