帮写一个stm32呼吸灯
时间: 2023-11-13 22:46:58 浏览: 43
好的,下面是一个简单的基于STM32的呼吸灯程序:
```c
#include "stm32f10x.h"
#define LED_PIN GPIO_Pin_13
#define LED_PORT GPIOC
int main(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
// 使能GPIOC时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
// 配置LED引脚为推挽输出
GPIO_InitStructure.GPIO_Pin = LED_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(LED_PORT, &GPIO_InitStructure);
// 使能TIM3时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
// TIM3基本配置
TIM_TimeBaseStructure.TIM_Period = 1000 - 1; // 定时器周期为1ms
TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1; // 定时器分频为72
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
// PWM模式配置
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0; // 初始占空比为0
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
// 启动计数器
TIM_Cmd(TIM3, ENABLE);
uint16_t duty_cycle = 0;
uint16_t step = 50;
while (1)
{
// 呼吸灯效果
duty_cycle += step;
if (duty_cycle >= 1000)
{
duty_cycle = 1000;
step = -step;
}
else if (duty_cycle == 0)
{
duty_cycle = 0;
step = -step;
}
TIM_SetCompare1(TIM3, duty_cycle);
delay_ms(10);
}
}
// 简单延时函数
void delay_ms(uint32_t ms)
{
volatile uint32_t i, j;
for (i = 0; i < ms; i++)
{
for (j = 0; j < 2000; j++);
}
}
```
该程序使用了TIM3定时器的PWM模式,实现了一个简单的呼吸灯效果。可以根据需要修改占空比的变化规律,并且可以通过调整计时器的分频和周期,调整呼吸灯的频率。