stm32输出pwm波的程序
时间: 2023-06-26 22:03:51 浏览: 70
下面是一个简单的示例程序,演示如何在STM32上使用定时器输出PWM:
```
#include "stm32f4xx.h"
#include "stm32f4xx_tim.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_gpio.h"
void TIM_Config(void);
void GPIO_Config(void);
int main(void)
{
GPIO_Config();
TIM_Config();
while(1)
{
// 在这里可以改变占空比来改变PWM波形
TIM_SetCompare1(TIM4, 500);
}
}
void TIM_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = 1000;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM4, &TIM_OCInitStructure);
TIM_Cmd(TIM4, ENABLE);
}
void GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_TIM4);
}
```
在这个示例中,我们使用了TIM4定时器输出PWM波形,频率为1kHz。在主循环中,我们可以通过改变TIM4的CCR1寄存器的值来改变占空比,从而改变PWM波形的占空比。
请注意,这只是一个简单的示例程序,实际应用中可能需要根据具体要求进行修改。