国民N32G031使用发光二极管上电闪亮。

void SystemInit(void)

{

    /* FPU settings

     * ------------------------------------------------------------*/

#if (__FPU_PRESENT == 1) && (__FPU_USED == 1)

    SCB->CPACR |= ((3UL << 10 * 2) | (3UL << 11 * 2)); /* set CP10 and CP11 Full Access */

#endif



    /* Reset the RCC clock configuration to the default reset state(for debug purpose) */

    /* Set MSIEN bit */

    RCC->CTRLSTS |= (uint32_t)0x00000004;



    /* Reset SW, HPRE, PPRE1, PPRE2 and MCO bits */

    RCC->CFG &= (uint32_t)0xF8FFC000;



    /* Reset HSEON, CLKSSEN and PLLEN bits */

    RCC->CTRL &= (uint32_t)0xFEF6FFFF;



    /* Reset HSEBYP bit */

    RCC->CTRL &= (uint32_t)0xFFFBFFFF;



    /* Reset PLLSRC, PLLXTPRE, PLLMUL, MCOPRES and USBPRES bits */

    RCC->CFG &= (uint32_t)0x0700FFFF;



    /* Reset CFG2 register */

    RCC->CFG2 = 0x00000000;



    /* Reset CFG3 register */

    RCC->CFG3 = 0x00000000;



    /* Reset RDCTRL register */

    RCC->RDCTRL = 0x00000000;



    /* Reset PLLHSIPRE register */

    RCC->PLLHSIPRE = 0x00000000;



    /* Disable all interrupts and clear pending bits  */

    RCC->CLKINT = 0x04BF8000;



    /* Enable ex mode */

    RCC->APB1PCLKEN |= RCC_APB1PCLKEN_PWREN;

    RCC->APB1PCLKEN &= (uint32_t)(~RCC_APB1PCLKEN_PWREN);



    /* Enable ICACHE and Prefetch Buffer */

    FLASH->AC |= (uint32_t)(FLASH_AC_ICAHEN | FLASH_AC_PRFTBFEN);

    

    /* Checks whether the Low Voltage Mode status is SET or RESET */

    if((FLASH->AC & FLASH_AC_LVMF) != RESET)

    {

        /* FLASH Low Voltage Mode Disable */

        FLASH->AC &= (uint32_t)(~FLASH_AC_LVMEN);

    }



#ifdef DATA_IN_ExtSRAM

    SystemInit_ExtMemCtl();

#endif /* DATA_IN_ExtSRAM */



    /* Configure the System clock frequency, HCLK, PCLK2 and PCLK1 prescalers */

    /* Configure the Flash Latency cycles and enable prefetch buffer */

    SetSysClock();



#ifdef VECT_TAB_SRAM

    SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM. */

#else

    SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH. */

#endif

}