STM32F103启动代码

以下是STM32F103启动代码的基本框架，你可以根据自己的需求对其进行修改：

/* Define the vector table */
__attribute__ ((section(".isr_vector")))
void (* const g_pfnVectors[])(void) =
{
    (void (*)(void))((uint32_t)&_estack),   /* The initial stack pointer */
    Reset_Handler,                          /* Reset Handler */
    NMI_Handler,                            /* NMI Handler */
    HardFault_Handler,                      /* Hard Fault Handler */
    /* ... */
};

/* Reset handler */
void Reset_Handler(void)
{
    /* Copy data from flash to RAM */
    uint32_t *pSrc, *pDest;
    pSrc = &_etext;
    pDest = &_sdata;
    while(pDest < &_edata)
    {
        *pDest++ = *pSrc++;
    }

    /* Initialize the bss segment to zero */
    pDest = &_sbss;
    while(pDest < &_ebss)
    {
        *pDest++ = 0;
    }

    /* Call SystemInit() */
    SystemInit();

    /* Call main() */
    main();
}

/* System initialization */
void SystemInit(void)
{
    /* ... */

    /* Configure the system clock */
    RCC_DeInit();
    RCC_HSEConfig(RCC_HSE_ON);
    RCC_WaitForHSEStartUp();
    RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
    RCC_PLLCmd(ENABLE);
    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
    while(RCC_GetSYSCLKSource() != 0x08);
    RCC_HCLKConfig(RCC_SYSCLK_Div1);
    RCC_PCLK1Config(RCC_HCLK_Div2);
    RCC_PCLK2Config(RCC_HCLK_Div1);

    /* ... */
}

/* Application main function */
int main(void)
{
    /* ... */
    
    while(1)
    {
        /* ... */
    }
}