bootloader无法跳转问题

Question

在gd32e230上做bootloader跳转到application时添加 __set_MSP( * ( __IO uint32_t * ) App_Addr )这一句初始堆栈指针就无法跳转，但是去掉这句话就可以正常跳转，请教一下各位 这是怎么回事？实在想不明白以下是跳转程序。

void IAP_ExecuteApp (uint32_t App_Addr)
{
                uint32_t JumpAddress;
         usart_disable(USART0);
        JumpAddress = * ( __IO uint32_t * )(App_Addr + 4);                //用户代码区第二个字为程序开始地址(复位地址)        
//        __set_MSP( * ( __IO uint32_t * ) App_Addr );        //初始化APP堆栈指针(用户代码区的第一个字用于存放栈顶地址)
        (*( void (*)( ) )JumpAddress) ();                                                        //跳转到APP.
}

第二个遇到的问题：在用bootloader进行程序升级测试时，划分三个区，分别是bootloder区，app1主程序区，app2待升级程序区。在测试时直接把待升级程序下载到所划分的区域中，然后利用bootloader copy到app1主程序区时，就在也没办法跳转了，下面是程序，恳请各位帮忙看看!感谢！
搬运app2程序到app1

unsigned int temp[64]={0}; //4个字节的数组
void MoveCode(unsigned int src_addr, unsigned int des_addr, unsigned int byte_size)
{
    /*1.擦除目的地址  前512K(bank0)地址，每页大小2KB，BANK1每页大小4KB*/
    SerialPutString("> Start erase des flash......\r\n");
    memset(temp,0,sizeof(temp));
  erase_page(des_addr, (byte_size/FMC_PAGE_SIZE)); //删除app1的代码
    
    SerialPutString("> Erase des flash down......\r\n");
    /*2.开始拷贝*/    
    SerialPutString("> Start copy......\r\n");
    for(int i = 0; i < byte_size/(64*4); i++)
    {
        ReadFlash_U32((src_addr + i*64*4), temp, 64*4);  //从APP2地址中读出
        FLASH_Program((des_addr + i*64*4), 64*4, temp);//按字写入APP1地址
        memset(temp,0,sizeof(temp));
    }
    SerialPutString("> Copy down......\r\n");
        /*3.擦除源地址*/
    SerialPutString("> Start erase src flash......\r\n");
    erase_page(src_addr, (byte_size/FMC_PAGE_SIZE));  //擦除 APP2内容
    SerialPutString("> Erase src flash down......\r\n");
}

**读若干个数据 4个字节**
```c
void ReadFlash_U32(uint32_t addr, uint32_t * buff, uint16_t word_size)
{
    for(int i =0; i < (word_size/4); i++)
    {
        buff[i] = *(__IO uint32_t*)(addr + 4 * i);
    }
}

**写入程序**
```c
TestStatus FLASH_Program(uint32_t WRITE_START_ADDR, uint16_t Size, uint32_t *data)
{   
      uint32_t see_data=0;
      uint32_t Address;
    TestStatus TransferStatus = PASSED;
    uint32_t i;
    /* Unlock the Flash Bank1 Program Erase controller */
    fmc_unlock();
    
    /* Clear All pending flags */
    fmc_flag_clear(FMC_FLAG_END | FMC_FLAG_WPERR | FMC_FLAG_PGERR);
    
    /* Program Flash Bank1 */
    Address = WRITE_START_ADDR;
    i = 0;
    while(Address < (WRITE_START_ADDR + Size))
    {
        fmc_word_program(Address, data[i]);
              see_data=*(uint32_t*)Address;
              if ( see_data!= data[i])
                {
                     TransferStatus=FAILED;//校验失败
                    SerialPutString("FAILED\r\n");
                }
        i++;
        Address = Address + 4; 
        fmc_flag_clear(FMC_FLAG_END | FMC_FLAG_WPERR | FMC_FLAG_PGERR);
    }
    fmc_lock();
    return TransferStatus;
}

Answer 1

• 你看下这篇博客吧, 应该有用👉 ：BootLoader有什么作用？