所需材料

• STM32微控制器
• 高壓數(shù)碼管
• 數(shù)碼管驅(qū)動(dòng)器IC
• 電源
• 電阻器
• 電容器
• 杜邦線
• 面包板

接線

1. 使用杜邦線將STM32的GPIOA中P0-P7連接到數(shù)碼管僧诚。

代碼

程序：

#include "stm32f4xx.h"
#include "stdio.h"

#define DIGIT_0 0x3F
#define DIGIT_1 0x06
#define DIGIT_2 0x5B
#define DIGIT_3 0x4F
#define DIGIT_4 0x66
#define DIGIT_5 0x6D
#define DIGIT_6 0x7D
#define DIGIT_7 0x07
#define DIGIT_8 0x7F
#define DIGIT_9 0x6F

int main(void)
{
    // 初始化GPIOA 的0-7引腳
    RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;
    GPIOA->MODER |= GPIO_MODER_MODER0_0 | GPIO_MODER_MODER1_0 | GPIO_MODER_MODER2_0 | GPIO_MODER_MODER3_0 | GPIO_MODER_MODER4_0 | GPIO_MODER_MODER5_0 | GPIO_MODER_MODER6_0 | GPIO_MODER_MODER7_0;
    GPIOA->OTYPER &= ~(GPIO_OTYPER_OT_0 | GPIO_OTYPER_OT_1 | GPIO_OTYPER_OT_2 | GPIO_OTYPER_OT_3 | GPIO_OTYPER_OT_4 | GPIO_OTYPER_OT_5 | GPIO_OTYPER_OT_6 | GPIO_OTYPER_OT_7);
    GPIOA->OSPEEDR &= ~(GPIO_OSPEEDER_OSPEEDR0 | GPIO_OSPEEDER_OSPEEDR1 | GPIO_OSPEEDER_OSPEEDR2 | GPIO_OSPEEDER_OSPEEDR3 | GPIO_OSPEEDER_OSPEEDR4 | GPIO_OSPEEDER_OSPEEDR5 | GPIO_OSPEEDER_OSPEEDR6 | GPIO_OSPEEDER_OSPEEDR7);
    GPIOA->PUPDR &= ~(GPIO_PUPDR_PUPDR0 | GPIO_PUPDR_PUPDR1 | GPIO_PUPDR_PUPDR2 | GPIO_PUPDR_PUPDR3 | GPIO_PUPDR_PUPDR4 | GPIO_PUPDR_PUPDR5 | GPIO_PUPDR_PUPDR6 | GPIO_PUPDR_PUPDR7);

    // 開啟時(shí)鐘
    RCC->APB1ENR |= RCC_APB1ENR_TIM2EN;

    // 初始化定時(shí)器
    TIM2->PSC = 8400 - 1; // 分頻系數(shù)為8400萍鲸，定時(shí)器時(shí)鐘為10kHz
    TIM2->ARR = 10000 - 1; // 自動(dòng)重裝載值為10000寒亥，即為1秒
    TIM2->CR1 |= TIM_CR1_ARPE; // 開啟自動(dòng)重載預(yù)裝載
    TIM2->CR1 &= ~TIM_CR1_DIR; // 向上計(jì)數(shù)
    TIM2->CR1 |= TIM_CR1_CEN; // 開啟定時(shí)器

    int count = 0;  // 計(jì)數(shù)器

    while(1)
    {
        if (TIM2->SR & TIM_SR_UIF) // 如果計(jì)時(shí)器溢出
        {
            TIM2->SR &= ~TIM_SR_UIF; // 清除中斷標(biāo)志位

            switch(count)
            {
                case 0:
                    GPIOA->ODR = DIGIT_0;
                    break;
                case 1:
                    GPIOA->ODR = DIGIT_1;
                    break;
                case 2:
                    GPIOA->ODR = DIGIT_2;
                    break;
                case 3:
                    GPIOA->ODR = DIGIT_3;
                    break;
                case 4:
                    GPIOA->ODR = DIGIT_4;
                    break;
                case 5:
                    GPIOA->ODR = DIGIT_5;
                    break;
                case 6:
                    GPIOA->ODR = DIGIT_6;
                    break;
                case 7:
                    GPIOA->ODR = DIGIT_7;
                    break;
                case 8:
                    GPIOA->ODR = DIGIT_8;
                    break;
                case 9:
                    GPIOA->ODR = DIGIT_9;
                    break;
                default:
                    GPIOA->ODR = DIGIT_0;
                    break;
            }

            count++; // 計(jì)數(shù)器自增

            if(count == 10) // 如果計(jì)數(shù)器等于10景醇，重置計(jì)數(shù)器
            {
                count = 0;
            }
        }
    }
}