帮我写一个STM32产生PWM的程序
时间: 2023-03-09 21:50:28 浏览: 70
我可以为您提供一个示例代码,它可以帮助您在STM32上产生PWM:#include<stdio.h>
#include "stm32f4xx.h"
//定义PWM输出引脚
#define PWM_OUTPUT_PIN_1 GPIO_Pin_9
#define PWM_OUTPUT_PIN_2 GPIO_Pin_11
//定义PWM引脚的端口
#define PWM_OUTPUT_PIN_GPIO_PORT GPIOA
//定义PWM波形的频率
#define PWM_FREQUENCY 10000
//定义PWM模块的通道
#define PWM_CHANNEL_1 TIM_Channel_2
#define PWM_CHANNEL_2 TIM_Channel_4
//定义PWM模块
#define PWM_TIMER TIM4
//定义PWM模块的定时器时钟
#define PWM_TIMER_CLK RCC_APB1Periph_TIM4
//定义PWM模块的引脚时钟
#define PWM_OUTPUT_PIN_GPIO_CLK RCC_AHB1Periph_GPIOA
//定义PWM模块的初始化结构体
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
//PWM初始化函数
void PWM_Init(void)
{
//使能PWM模块的时钟
RCC_APB1PeriphClockCmd(PWM_TIMER_CLK, ENABLE);
//使能PWM引脚的时钟
RCC_AHB1PeriphClockCmd(PWM_OUTPUT_PIN_GPIO_CLK, ENABLE);
//配置PWM引脚的GPIO
GPIO_InitStructure.GPIO_Pin = PWM_OUTPUT_PIN_1 | PWM_OUTPUT_PIN_2;
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(PWM_OUTPUT_PIN_GPIO_PORT, &GPIO_InitStructure);
//将GPIO与TIM4相连接
GPIO_PinAFConfig(PWM_OUTPUT_PIN_GPIO_PORT, GPIO_PinSource9, GPIO_AF_TIM4);
GPIO_PinAFConfig(PWM_OUTPUT_PIN_GPIO_PORT, GPIO_PinSource11, GPIO_AF_TIM4);
//设置PWM模块的定时器参数
TIM_TimeBaseStructure.TIM_Period = (SystemCoreClock / PWM_FREQUENCY) - 1;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(PWM_TIMER, &TIM_TimeBaseStructure);
//设置PWM模块的输出参数
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_Pulse = 0;
//初始化PWM模块的通道1
TIM_OC2Init(PWM_TIMER, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(PWM_TIMER, TIM_OCPreload_Enable);
//初始化PWM模块的通道2
TIM_OC4Init(PWM_TIMER, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(PWM_TIMER, TIM_OCPreload_Enable);
//使能PWM模块
TIM_Cmd(PWM_TIMER, ENABLE);
}
//设置PWM输出的占空比
void PWM_SetDutyCycle_Channel1(u16 DutyCycle)
{
TIM_SetCompare2(PWM_TIMER, DutyCycle);
}
//设置PWM输出的占空比
void PWM_SetDutyCycle_Channel2(u16 DutyCycle)
{
TIM_SetCompare4(PWM_TIMER, DutyCycle);
}
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