keil5篮球计时器

基于STM32的篮球比赛计时计分器的设计需要使用Keil5进行编程。下面是一个基于中断按键的篮球计时器的代码示例：

#include "stm32f10x.h"
#include "lcd.h"

#define KEY1 GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0)
#define KEY2 GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_1)
#define KEY3 GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_2)

uint16_t time = 600; // 比赛时间，单位为秒
uint16_t attack_time = 24; // 进攻时间，单位为秒
uint8_t pause_flag = 0; // 暂停标志位，0表示未暂停，1表示已暂停

void TIM2_IRQHandler(void)
{
    if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
    {
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
        if(!pause_flag)
        {
            time--;
            attack_time--;
        }
    }
}

void EXTI0_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line0) != RESET)
    {
        EXTI_ClearITPendingBit(EXTI_Line0);
        if(!pause_flag)
        {
            pause_flag = 1;
            TIM_Cmd(TIM2, DISABLE);
        }
        else
        {
            pause_flag = 0;
            TIM_Cmd(TIM2, ENABLE);
        }
    }
}

void EXTI1_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line1) != RESET)
    {
        EXTI_ClearITPendingBit(EXTI_Line1);
        time = 600;
        attack_time = 24;
        pause_flag = 0;
        TIM_Cmd(TIM2, ENABLE);
    }
}

void EXTI2_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line2) != RESET)
    {
        EXTI_ClearITPendingBit(EXTI_Line2);
        attack_time = 24;
    }
}

int main(void)
{
    LCD_Init();
    LCD_Clear(WHITE);
    LCD_ShowString(0, 0, "Time:");
    LCD_ShowString(0, 16, "Attack Time:");
    LCD_ShowNum(48, 0, time / 60, 2, 16);
    LCD_ShowNum(72, 0, time % 60, 2, 16);
    LCD_ShowNum(96, 16, attack_time, 2, 16);

    GPIO_InitTypeDef GPIO_InitStructure;
    EXTI_InitTypeDef EXTI_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    TIM_TimeBaseStructure.TIM_Period = 999;
    TIM_TimeBaseStructure.TIM_Prescaler = 7199;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
    TIM_Cmd(TIM2, ENABLE);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);
    EXTI_InitStructure.EXTI_Line = EXTI_Line0;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);
    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource1);
    EXTI_InitStructure.EXTI_Line = EXTI_Line1;
    EXTI_Init(&EXTI_InitStructure);
    NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;
    NVIC_Init(&NVIC_InitStructure);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource2);
    EXTI_InitStructure.EXTI_Line = EXTI_Line2;
    EXTI_Init(&EXTI_InitStructure);
    NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;
    NVIC_Init(&NVIC_InitStructure);

    while(1)
    {
        LCD_ShowNum(48, 0, time / 60, 2, 16);
        LCD_ShowNum(72, 0, time % 60, 2, 16);
        LCD_ShowNum(96, 16, attack_time, 2, 16);
        if(KEY1)
        {
            while(KEY1);
            if(!pause_flag)
            {
                pause_flag = 1;
                TIM_Cmd(TIM2, DISABLE);
            }
            else
            {
                pause_flag = 0;
                TIM_Cmd(TIM2, ENABLE);
            }
        }
        if(KEY2)
        {
            while(KEY2);
            time = 600;
            attack_time = 24;
            pause_flag = 0;
            TIM_Cmd(TIM2, ENABLE);
        }
        if(KEY3)
        {
            while(KEY3);
            attack_time = 24;
        }
    }
}

该代码使用了定时器TIM2和外部中断EXTI0、EXTI1、EXTI2。其中，TIM2用于计时，EXTI0用于暂停/继续，EXTI1用于复位，EXTI2用于重置进攻时间。在主函数中，通过轮询按键状态来实现按键功能。同时，LCD显示比赛时间和进攻时间。