蓝桥杯STM32F103RB数码管计时（秒表）

STM32F103RB数码管定时（秒表）

硬件单路
`配置TIM2及其中断代码片如下(示例)`
`中断执行函数代码片如下(示例)`
`seg.c(数码管)代码片如下(示例)`
完整工程下载>>[GitHub](https://github.com/HDJ1839822/Github.git)

实验功能：三位数码管实现十分钟计时，最左边数码管显示分钟数，中间和右边的数码管显示秒数。

硬件单路

在这里插入图片描述

`配置TIM2及其中断代码片如下(示例)`

void TIM2_NVIC(void){NVIC_InitTypeDef NVIC_InitStructure;NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置中断分组NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;//设置TIM2中断NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;//抢占优先级为0NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;//响应优先级为1NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能中断源NVIC_Init(&NVIC_InitStructure);}void TIM2_Init(void) // 1S
{TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);TIM_TimeBaseInitStruct.TIM_Prescaler = (2000-1);//预分频系数    2000-1s  TIM_TimeBaseInitStruct.TIM_Period = (36000-1);//自动重载计数周期值TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;//设置为向上计数方式TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;//时钟分频系数TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);TIM_ClearFlag(TIM2,TIM_FLAG_Update);//清除中断TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);//使能TIM2的更新中断TIM_Cmd(TIM2, ENABLE);//使能TIM2定时器
}

`中断执行函数代码片如下(示例)`

int num=0;
void TIM2_IRQHandler(void) 
{ if(TIM_GetITStatus(TIM2,TIM_IT_Update) != RESET){num++;s++; if(s==10)s=0;  if(num%10==0) m++;if(m==6)m=0;if(num%60==0)h++;if(h==10)h=0;}TIM_ClearITPendingBit(TIM2,TIM_IT_Update);
}

`seg.c(数码管)代码片如下(示例)`

#include "seg.h"void SEG_Init(void)
{GPIO_InitTypeDef GPIO_InitStruct;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_Init(GPIOA, &GPIO_InitStruct);
}void SEG_Disp(unsigned char ucData1, unsigned char ucData2,unsigned char ucData3, unsigned char ucDot)
{unsigned char i;
//  unsigned char code[17]={0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07,
//    0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71, 0x00}; //直接定义好了0123——15unsigned char code[17]={0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07,0x7f, 0x6f};//0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71, 0x00}; unsigned long ulData = (code[ucData3] << 16) + (code[ucData2] << 8)+ code[ucData1];ulData += (ucDot&1)<<23; //个位ulData += (ucDot&2)<<14; //十位ulData += (ucDot&4)<<5;  //百位/*SER(串行数据输入)--PA1 SCK(移位时钟)    --PA3 RCK(输出锁存）   --PA2*/for(i=0; i<24; i++){if(ulData & 0x800000)						//0x800000   24  三个八位GPIO_SetBits(GPIOA, GPIO_Pin_1);			// PA1(SER)=1elseGPIO_ResetBits(GPIOA, GPIO_Pin_1);		// PA1(SER)=0ulData <<= 1;GPIO_SetBits(GPIOA, GPIO_Pin_3);			// PA3(SCK)=1GPIO_ResetBits(GPIOA, GPIO_Pin_3);			// PA3(SCK)=0}GPIO_SetBits(GPIOA, GPIO_Pin_2);				// PA2(RCK)=1GPIO_ResetBits(GPIOA, GPIO_Pin_2);			// PA2(RCK)=0
}