使用stm32f10x嵌入式来编程如下问题:两个按键控制一个led和一个蜂鸣器。按键1按下,led亮,蜂鸣器响。按键2按下,led灭,蜂鸣器不响。
时间: 2023-05-19 09:05:45 浏览: 95
可以使用GPIO口来控制LED和蜂鸣器的状态,同时使用外部中断来检测按键的状态。具体实现方法可以参考以下代码:
#include "stm32f10x.h"
void GPIO_Configuration(void);
void EXTI_Configuration(void);
void NVIC_Configuration(void);
int main(void)
{
GPIO_Configuration();
EXTI_Configuration();
NVIC_Configuration();
while (1)
{
// 程序主循环
}
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// 使能GPIOA和GPIOB时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);
// 配置LED引脚为推挽输出
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 配置蜂鸣器引脚为推挽输出
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 配置按键1引脚为上拉输入
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// 配置按键2引脚为上拉输入
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
void EXTI_Configuration(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
// 使能AFIO时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
// 配置按键1的外部中断线
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, 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);
// 配置按键2的外部中断线
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource1);
EXTI_InitStructure.EXTI_Line = EXTI_Line1;
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;
// 配置按键1的中断优先级
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// 配置按键2的中断优先级
NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void EXTI0_IRQHandler(void)
{
// 检测按键1是否按下
if (EXTI_GetITStatus(EXTI_Line0) != RESET)
{
// 点亮LED
GPIO_SetBits(GPIOA, GPIO_Pin_8);
// 响蜂鸣器
GPIO_SetBits(GPIOA, GPIO_Pin_9);
// 清除中断标志位
EXTI_ClearITPendingBit(EXTI_Line0);
}
}
void EXTI1_IRQHandler(void)
{
// 检测按键2是否按下
if (EXTI_GetITStatus(EXTI_Line1) != RESET)
{
// 熄灭LED
GPIO_ResetBits(GPIOA, GPIO_Pin_8);
// 不响蜂鸣器
GPIO_ResetBits(GPIOA, GPIO_Pin_9);
// 清除中断标志位
EXTI_ClearITPendingBit(EXTI_Line1);
}
}