stm32一个定时器多路同频率不同占空比pwm
时间: 2023-11-26 10:05:58 浏览: 93
可以使用STM32的定时器和通道来实现多路同频率不同占空比的PWM输出。具体实现步骤如下:
1. 配置定时器的基本参数,如时钟源、预分频系数、计数器自动重载值等。
2. 配置定时器的通道,选择输出模式为PWM模式,并设置占空比。
3. 重复步骤2,配置多个通道,每个通道的占空比可以不同。
4. 启动定时器。
下面是一个简单的示例代码,使用TIM1的4个通道实现4路同频率不同占空比的PWM输出:
```c
#include "stm32f4xx.h"
void TIM1_PWM_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
TIM_TimeBaseStructure.TIM_Period = 999; // PWM频率为84MHz/1000=84kHz
TIM_TimeBaseStructure.TIM_Prescaler = 83; // 预分频系数为84
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 500; // 初始占空比为50%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
TIM_OC3Init(TIM1, &TIM_OCInitStructure);
TIM_OC4Init(TIM1, &TIM_OCInitStructure);
TIM_Cmd(TIM1, ENABLE);
}
int main(void)
{
TIM1_PWM_Init();
while (1) {
// do something
}
}
```