基于STM32的多功能秒表

当上电运行后，按下KEY1,秒表开始正计时，再次按下KEY1秒表停止计时，按下KEY2秒表清零，按下KEY3，手动调节秒表时间递增，按下KEY4手动调节秒表时间递减，按下KEY5秒表倒计时，倒计时到0时蜂鸣器响起来。

#include "stm32f10x.h"
#include "sys.h"
#define FM PBout(10)
#define uint unsigned int
#define KEY1 GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_11)
#define KEY2 GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_12)
#define KEY3 GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_13)
#define KEY4 GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_14)
#define KEY5 GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_15)
void Smg_Init(void);
void Key_Init(void);
void FM_Init(void);  //蜂鸣器初始化
void Delay(void);
void TIM3_Init(u16 arr,u16 psc);
void TIM2_Init(u16 arr,u16 psc);
uint arr1[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};//没有小数点数码管
uint arr2[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef};//小数点数码管
uint disp1[2],disp2[2];
uint ID=0;
uint b=0;
uint a,temp1,temp2,flag=0;
int main(void)
{NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置2位抢占优先级2位响应优先级Smg_Init();Key_Init();FM_Init();TIM3_Init(220,7199);   //时钟参数配置TIM2_Init(220,7199);while(1){if(KEY1==0){Delay();if(KEY1==0){ID++;if(ID==3)         ID=1;          }     switch(ID){case 1:TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE); //使能时钟，允许更新中断TIM_Cmd(TIM3,ENABLE);  //使能时钟break;case 2:TIM_ITConfig(TIM3,TIM_IT_Update,DISABLE); //关闭更新中断TIM_Cmd(TIM3,DISABLE); //关闭时钟break;}while(KEY1==0);}if(KEY2==0)  //清空秒表{a=0;b=0;GPIO_Write(GPIOA,0x3fbf);GPIO_Write(GPIOC,0x3f3f);while(KEY2==0);}if(KEY3==0)  //手动加数{a++;disp1[0]=arr1[a%10];disp1[1]=arr1[a/10];disp2[0]=arr2[b%10];disp2[1]=arr1[b/10];temp1=(disp1[1]<<8)|(disp1[0]&0x00ff);temp2=(disp2[1]<<8)|(disp2[0]&0x00ff);GPIO_Write(GPIOC,temp1);GPIO_Write(GPIOA,temp2);while(KEY3==0);} if(KEY4==0)  //手动减数{a--;disp1[0]=arr1[a%10];disp1[1]=arr1[a/10];disp2[0]=arr2[b%10];disp2[1]=arr1[b/10];temp1=(disp1[1]<<8)|(disp1[0]&0x00ff);temp2=(disp2[1]<<8)|(disp2[0]&0x00ff);GPIO_Write(GPIOC,temp1);GPIO_Write(GPIOA,temp2);while(KEY4==0);}  if(KEY5==0)  //倒计时{TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE); //使能时钟，允许更新中断TIM_Cmd(TIM2,ENABLE);  //使能时钟flag=1;while(KEY5==0);}         }       
}
void Smg_Init(void)
{GPIO_InitTypeDef GPIO_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC,ENABLE);GPIO_InitStructure.GPIO_Pin=0xffff;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;GPIO_Init(GPIOA,&GPIO_InitStructure);GPIO_Init(GPIOC,&GPIO_InitStructure);GPIO_Write(GPIOA,0x3fbf);GPIO_Write(GPIOC,0x3f3f);
}
void Key_Init(void)
{GPIO_InitTypeDef GPIO_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);GPIO_InitStructure.GPIO_Pin=GPIO_Pin_11|GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;  //上拉GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;GPIO_Init(GPIOB,&GPIO_InitStructure);
}
void FM_Init(void)
{GPIO_InitTypeDef GPIO_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;GPIO_Init(GPIOB,&GPIO_InitStructure);GPIO_SetBits(GPIOB,GPIO_Pin_10);
}
void TIM3_Init(u16 arr,u16 psc)
{TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;NVIC_InitTypeDef NVIC_InitStructure;RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);TIM_TimeBaseStructure.TIM_Period=arr;  //周期TIM_TimeBaseStructure.TIM_Prescaler=psc;  //分频系数TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;//分频因子TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//计数模式TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn;//TIM3中断NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;// 抢占优先级NVIC_InitStructure.NVIC_IRQChannelSubPriority=3;       //响应优先级NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;NVIC_Init(&NVIC_InitStructure);
}
void TIM2_Init(u16 arr,u16 psc)
{TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure1;NVIC_InitTypeDef NVIC_InitStructure1;RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);TIM_TimeBaseStructure1.TIM_Period=arr;  //周期TIM_TimeBaseStructure1.TIM_Prescaler=psc;  //分频系数TIM_TimeBaseStructure1.TIM_ClockDivision=TIM_CKD_DIV1;//分频因子TIM_TimeBaseStructure1.TIM_CounterMode=TIM_CounterMode_Up;//计数模式TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure1);NVIC_InitStructure1.NVIC_IRQChannel=TIM2_IRQn;//TIM2中断NVIC_InitStructure1.NVIC_IRQChannelPreemptionPriority=0;// 抢占优先级NVIC_InitStructure1.NVIC_IRQChannelSubPriority=3;       //响应优先级NVIC_InitStructure1.NVIC_IRQChannelCmd=ENABLE;NVIC_Init(&NVIC_InitStructure1);
}
void TIM3_IRQHandler(void)  //TIM3中断服务程序
{a++;disp1[0]=arr1[a%10];disp1[1]=arr1[a/10];disp2[0]=arr2[b%10];disp2[1]=arr1[b/10];temp1=(disp1[1]<<8)|(disp1[0]&0x00ff);temp2=(disp2[1]<<8)|(disp2[0]&0x00ff);GPIO_Write(GPIOC,temp1);GPIO_Write(GPIOA,temp2);if(a==60){a=0;b++;}  if(b==60){b=0;a=0;}TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
}
void TIM2_IRQHandler(void)  //TIM2中断服务程序
{a--;disp1[0]=arr1[a%10];disp1[1]=arr1[a/10];disp2[0]=arr2[b%10];disp2[1]=arr1[b/10];temp1=(disp1[1]<<8)|(disp1[0]&0x00ff);temp2=(disp2[1]<<8)|(disp2[0]&0x00ff);GPIO_Write(GPIOC,temp1);GPIO_Write(GPIOA,temp2);if(a==0){if(b!=0){b--;a=60;}}if((a==0)&&(b==0)&&(flag==1)){flag=0;a=0;b=0;GPIO_Write(GPIOA,0x3fbf);GPIO_Write(GPIOC,0x3f3f);     while(1){FM=~FM;Delay();}}     TIM_ClearITPendingBit(TIM2,TIM_IT_Update);
}            
void Delay(void)
{uint i,j;for(i=0;i<50;i++)for(j=0;j<80;j++);
}

硬件电路原理图