用C语言写一个STM32F407数码管驱动

下面是一个STM32F407数码管驱动的简单C语言代码：

#include "stm32f4xx.h"

//定义数码管的端口和引脚
#define SEG_PORT GPIOA
#define SEG_PIN GPIO_Pin_0

void delay(uint32_t time)
{
    while (time--);
}

void Display(uint8_t num)
{
    //清空数码管端口
    SEG_PORT->ODR = 0x00;
    //根据数字选择对应的灯亮起
    switch (num)
    {
        case 0:
            SEG_PORT->ODR = 0x3F;
            break;
        case 1:
            SEG_PORT->ODR = 0x06;
            break;
        case 2:
            SEG_PORT->ODR = 0x5B;
            break;
        case 3:
            SEG_PORT->ODR = 0x4F;
            break;
        case 4:
            SEG_PORT->ODR = 0x66;
            break;
        case 5:
            SEG_PORT->ODR = 0x6D;
            break;
        case 6:
            SEG_PORT->ODR = 0x7D;
            break;
        case 7:
            SEG_PORT->ODR = 0x07;
            break;
        case 8:
            SEG_PORT->ODR = 0x7F;
            break;
        case 9:
            SEG_PORT->ODR = 0x6F;
            break;
        default:
            break;
    }
    delay(0xfffff);
}

int main(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    //初始化GPIOA的0号引脚
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    GPIO_InitStructure.GPIO_Pin = SEG_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(SEG_PORT, &GPIO_InitStructure);
    
    while (1)
    {
        //循环显示数字0-9
        for (uint8_t i = 0; i < 10; i++)
        {
            Display(i);
        }
    }
}

请注意，这仅仅是一个