stm32f405 pwm呼吸灯
时间: 2023-10-14 19:08:02 浏览: 111
要实现 STM32F405 的 PWM 呼吸灯效果,可以使用定时器和通道来控制 PWM 波形的占空比。具体步骤如下:
1. 初始化定时器和通道,设置 PWM 的频率和占空比。
2. 在主循环中,通过改变占空比的值来实现呼吸灯效果。
3. 可以使用延时函数或者定时器中断来控制呼吸灯的速度。
以下是一个简单的示例代码:
```c
#include "stm32f4xx.h"
void TIM_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
TIM_OCInitTypeDef TIM_OCInitStruct;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseInitStruct.TIM_Prescaler = 0;
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStruct.TIM_Period = 1000 - 1;
TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStruct.TIM_Pulse = 500 - 1;
TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM2, &TIM_OCInitStruct);
TIM_Cmd(TIM2, ENABLE);
}
int main(void)
{
TIM_Config();
while (1) {
for (int i = 0; i < 500; i++) {
TIM_SetCompare1(TIM2, i);
for (int j = 0; j < 10000; j++);
}
for (int i = 500; i > 0; i--) {
TIM_SetCompare1(TIM2, i);
for (int j = 0; j < 10000; j++);
}
}
}
```
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