STM32中,按键控制流水灯速度。编写代码
时间: 2024-11-04 15:11:15 浏览: 67
在STM32单片机上,我们可以使用中断驱动的方式来控制按键与流水灯的交互,并调整流水灯的速度。这里是一个基本的例子,假设我们有一个按键和8个LED作为流水灯:
```c
#include "stm32f10x.h" // 包含头文件
// LED和GPIO初始化
void led_init(void) {
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | ... | GPIO_Pin_7; // 确定哪些GPIO口连接到LED
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; // 输出模式
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; // 高速推挽
GPIO_Init(GPIOB, &GPIO_InitStructure); // 初始化GPIOB
}
// 按键中断服务函数
void EXTI0_IRQHandler(void) { // 假设按键连接到EXTI0
if (EXTI_GetITStatus(EXTI_Line0) == SET) { // 如果有按键按下
EXTI_ClearITPendingBit(EXTI_Line0); // 清除中断标志
toggle_leds(); // 调换LED的状态,改变流水灯速度
}
}
// LED切换函数,用于切换流水灯状态
void toggle_leds() {
static int index = 0; // 记录当前点亮的LED位置
GPIO_SetBits(GPIOB, GPIO_Pin_((index++) % 8)); // 点亮下一个LED
if (index >= 8) index = 0; // 如果超过范围,则回到第一个LED
}
int main(void) {
led_init();
NVIC_EnableIRQ(EXTI0_IRQn); // 开启EXTI0的中断
while (1) {
// 主循环,处理其他任务...
}
}
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