如何用stm32f103c8t6控制共阳极三位数码管

可以使用STM32F103C8T6的GPIO口来控制共阳极三位数码管显示数字。由于共阳极三位数码管需要同时驱动三个数码管，因此需要使用定时器中断来实现动态扫描显示。下面是一个简单的代码实现：

1.首先需要在STM32F103C8T6上配置GPIO口为输出，配置定时器中断扫描三个数码管。

#include "stm32f10x.h"
#define uchar unsigned char
#define uint unsigned int

// 定义数码管端口，共阳极三位数码管需要同时输出三个数码管的段选和位选信号
#define DIG0_ON GPIOA->BRR = GPIO_Pin_0
#define DIG1_ON GPIOA->BRR = GPIO_Pin_1
#define DIG2_ON GPIOA->BRR = GPIO_Pin_2
#define DIG0_OFF GPIOA->BSRR = GPIO_Pin_0
#define DIG1_OFF GPIOA->BSRR = GPIO_Pin_1
#define DIG2_OFF GPIOA->BSRR = GPIO_Pin_2
#define SEG_A_ON GPIOB->BRR = GPIO_Pin_1
#define SEG_B_ON GPIOC->BRR = GPIO_Pin_5
#define SEG_C_ON GPIOC->BRR = GPIO_Pin_4
#define SEG_D_ON GPIOC->BRR = GPIO_Pin_3
#define SEG_E_ON GPIOC->BRR = GPIO_Pin_2
#define SEG_F_ON GPIOC->BRR = GPIO_Pin_1
#define SEG_G_ON GPIOC->BRR = GPIO_Pin_0
#define SEG_DP_ON GPIOD->BRR = GPIO_Pin_2
#define SEG_A_OFF GPIOB->BSRR = GPIO_Pin_1
#define SEG_B_OFF GPIOC->BSRR = GPIO_Pin_5
#define SEG_C_OFF GPIOC->BSRR = GPIO_Pin_4
#define SEG_D_OFF GPIOC->BSRR = GPIO_Pin_3
#define SEG_E_OFF GPIOC->BSRR = GPIO_Pin_2
#define SEG_F_OFF GPIOC->BSRR = GPIO_Pin_1
#define SEG_G_OFF GPIOC->BSRR = GPIO_Pin_0
#define SEG_DP_OFF GPIOD->BSRR = GPIO_Pin_2

// 数码管显示数据表，共阳极三位数码管需要同时输出三个数码管的段选和位选信号
uchar dis_table[16]={{0,0,0}, {1,0,0}, {0,1,0}, {1,1,0}, {0,0,1}, {1,0,1}, {0,1,1}, {1,1,1}, {0,0,0}, {1,0,0}, {0,1,0}, {1,1,0}, {0,0,1}, {1,0,1}, {0,1,1}, {1,1,1}};

// 定义定时器中断函数
void TIM1_UP_IRQHandler(void)
{
    static uint cnt = 0;
    static uint num_cnt = 0;
    static uint num = {0,0,0};
    if(TIM_GetITStatus(TIM1,TIM_IT_Update)!=RESET) 
    {
        TIM_ClearITPendingBit(TIM1,TIM_IT_Update);
        if(cnt == 0)
        {
            // 计算当前位数字和位选信号
            num_cnt++;
            if(num_cnt > 2) num_cnt = 0;
            num[num_cnt] = num[num_cnt] + 1;
            if(num[num_cnt] > 9) num[num_cnt] = 0;
            // 输出数字和位选信号
            DIG0_OFF;
            DIG1_OFF;
            DIG2_OFF;
            SEG_A_OFF;
            SEG_B_OFF;
            SEG_C_OFF;
            SEG_D_OFF;
            SEG_E_OFF;
            SEG_F_OFF;
            SEG_G_OFF;
            SEG_DP_OFF;
            if(num_cnt == 0)
            {
                if(num != 0) SEG_A_ON;
                SEG_B_ON;
                if(num != 1 && num != 4) SEG_C_ON;
                if(num != 0 && num != 1 && num != 7) SEG_D_ON;
                if(num == 0 || num == 2 || num == 6 || num == 8) SEG_E_ON;
                if(num != 1 && num != 2 && num != 3 && num != 7) SEG_F_ON;
                if(num != 0 && num != 1 && num != 7) SEG_G_ON;
                if(num == 0) SEG_DP_ON;
                DIG0_ON;
            }
            else if(num_cnt == 1)
            {
                if(num != 0) SEG_A_ON;
                if(num != 2 && num != 6 && num != 8 && num != 0) SEG_B_ON;
                if(num != 1 && num != 4 && num != 7) SEG_C_ON;
                if(num != 1 && num != 4) SEG_D_ON;
                if(num != 0 && num != 1 && num != 7) SEG_E_ON;
                if(num != 1 && num != 2 && num != 3 && num != 7 && num != 0) SEG_F_ON;
                if(num != 0 && num != 1 && num != 7) SEG_G_ON;
                DIG1_ON;
            }
            else if(num_cnt == 2)
            {
                if(num != 0) SEG_A_ON;
                if(num != 2 && num != 6 && num != 8 && num != 0) SEG_B_ON;
                if(num != 1 && num != 4 && num != 7) SEG_C_ON;
                if(num != 1 && num != 4) SEG_D_ON;
                if(num != 0 && num != 1 && num != 7) SEG_E_ON;
                if(num != 1 && num != 2 && num != 3 && num != 7 && num != 0) SEG_F_ON;
                if(num != 0 && num != 1 && num != 7) SEG_G_ON;
                DIG2_ON;
            }
        }
        cnt++;
        if(cnt > 100) cnt = 0;
    }
}

int main(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; 
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); 

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; 
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; 
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; 
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
    GPIO_Init(GPIOC, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; 
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
    GPIO_Init(GPIOD, &GPIO_InitStructure);

    // 定时器TIM2配置，设置周期为1ms
    TIM_TimeBaseStructure.TIM_Period = 999; 
    TIM_TimeBaseStructure.TIM_Prescaler = 71;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    // 定时器TIM2中断配置
    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
    TIM_Cmd(TIM2,ENABLE);

    while(1);
}

2.配置完成后，就可以通过修改num数组的值来改变三位数码管显示的数字了。