[嵌入式]STM32/APM32 M0内核IAP升级

1、APP部分，M0内核的向量表必须拷贝到内存，并将中断向量修改为RAM

#define SYSCFG_MemoryRemap_SRAM     ((uint8_t)0x03)
void IAP_Set()
{
    uint32_t i = 0;
    /* Relocate by software the vector table to the internal SRAM at 0x20000000 ***/
    /* Copy the vector table from the Flash (mapped at the base of the application
       load address 0x08003000) to the base address of the SRAM at 0x20000000. */
    for(i = 0; i < 48; i++)
    {
        *((uint32_t*)(0x20000000 + (i << 2)))=*(__IO uint32_t*)(APP_ADDRESS + (i<<2));
    }
    /* Enable the SYSCFG peripheral clock*/
#if 0 //STM32
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
    SYSCFG_MemoryRemapConfig(SYSCFG_MemoryRemap_SRAM);
#else //AMP32
    RCM_EnableAPB2PeriphClock(RCM_APB2_PERIPH_SYSCFG);
    /* Remap SRAM at 0x00000000 */
    SYSCFG->CFG1_B.MMSEL = SYSCFG_MemoryRemap_SRAM;
#endif
}

2、APP中中断向量表在RAM中，所以要避免RAM覆盖，APP设置如下

?3、IAP跳转到APP

typedef  void (*pFunction)(void);
pFunction Jump_To_Application;
uint32_t JumpAddress;
void JumpAPP()
{
    /* Test if user code is programmed starting from address "APPLICATION_ADDRESS" */
    if (((*(__IO uint32_t*)APP_ADDRESS) & 0x2FFE0000 ) == 0x20000000)
    {
        /* Jump to user application */
        JumpAddress = *(__IO uint32_t*) (APP_ADDRESS + 4);
        Jump_To_Application = (pFunction) JumpAddress;
        /* Initialize user application's Stack Pointer */
        __set_MSP(*(__IO uint32_t*) APP_ADDRESS);
        /* Jump to application */
        Jump_To_Application();
    }
}