基于stm32f103zet6按键计数的程序

以下是基于STM32F103ZET6的按键计数程序，使用了STM32标准外设库（StdPeriph）：

#include "stm32f10x.h"

void GPIO_Configuration(void);
void EXTI_Configuration(void);
void NVIC_Configuration(void);

uint8_t count = 0;

int main(void)
{
    GPIO_Configuration();
    EXTI_Configuration();
    NVIC_Configuration();
    
    while(1);
}

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);
}

void EXTI_Configuration(void)
{
    EXTI_InitTypeDef EXTI_InitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource13);
    
    EXTI_InitStructure.EXTI_Line = EXTI_Line13;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);
}

void NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;
    
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    
    NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void EXTI15_10_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line13) != RESET)
    {
        EXTI_ClearITPendingBit(EXTI_Line13);
        count++;
    }
}

该程序通过GPIO配置将PC13引脚配置为上拉输入模式，通过EXTI配置将该引脚连接到外部中断线13上，并设置下降沿触发。在NVIC配置中，将EXTI中断优先级设置为1，启用该中断。在EXTI的中断服务函数中，当检测到下降沿触发时，计数器count加一。