stm32多通道输出pwm波
时间: 2023-11-12 19:08:08 浏览: 52
在STM32中,可以使用定时器来生成PWM波。下面是一个多通道输出PWM波的示例代码:
```c
#include "stm32f10x.h"
void TIM2_PWM_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
//使能GPIO和TIM2的时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
//配置GPIO为复用功能,推挽输出
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//TIM2的基本配置
TIM_TimeBaseStructure.TIM_Period = 999; //计数器周期为1000
TIM_TimeBaseStructure.TIM_Prescaler = 71; //预分频器为72
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
//通道1 PWM模式配置
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 499; //占空比50%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
//通道2 PWM模式配置
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 249; //占空比25%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC2Init(TIM2, &TIM_OCInitStructure);
//通道3 PWM模式配置
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 749; //占空比75%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC3Init(TIM2, &TIM_OCInitStructure);
//通道4 PWM模式配置
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 99; //占空比10%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC4Init(TIM2, &TIM_OCInitStructure);
//启动TIM2
TIM_Cmd(TIM2, ENABLE);
}
```
说明:
1. 使用了TIM2定时器,并且将GPIOA的0、1、2、3引脚配置为复用功能,推挽输出。
2. TIM2的时钟频率为72MHz,通过预分频器设置为1MHz,计数器周期设置为1000,即每1ms计数一次。
3. 通道1、2、3、4都使用了PWM模式,占空比分别为50%、25%、75%、10%。
在上面的例子中,通过修改TIM_OCInitStructure的TIM_Pulse成员可以控制占空比的大小,从而实现多通道输出不同占空比的PWM波。