STM32利用标准库编写同时输出4路PWM信号的程序（Proteus）仿真

news/2024/4/27 20:24:47

先看看结果：

这个是根据上午发的文章的基础上更改的，很简单，只是用了一个定时器，初始化了4个比较器而已，就可以单独的控制每一路PWM的占空比了，好了，把源文件展示一下，完事去接孩子放学。

PWM.c文件：

#include "stm32f10x.h"                  // Device headervoid PWM_Init(void)
{RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);TIM_InternalClockConfig(TIM2);TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;TIM_TimeBaseInitStruct.TIM_Period = 100-1;TIM_TimeBaseInitStruct.TIM_Prescaler = 720-1;TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);TIM_OCInitTypeDef TIM_OCInitStruct;TIM_OCStructInit(&TIM_OCInitStruct);TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;TIM_OCInitStruct.TIM_Pulse = 0;TIM_OC1Init(TIM2, &TIM_OCInitStruct);TIM_OC2Init(TIM2, &TIM_OCInitStruct);TIM_OC3Init(TIM2, &TIM_OCInitStruct);TIM_OC4Init(TIM2, &TIM_OCInitStruct);GPIO_InitTypeDef GPIO_InitStruct;GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 |GPIO_Pin_3;GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStruct);TIM_Cmd(TIM2, ENABLE);}//  设置PWM的函数，第一个参数是第几个比较器的意思，   第二个参数是这个比较器的值是多少？
void SET_PWM(uint16_t num, uint16_t key)
{if(num == 1){TIM_SetCompare1(TIM2, key);}if(num == 2){TIM_SetCompare2(TIM2, key);}if(num == 3){TIM_SetCompare3(TIM2, key);}if(num == 4){TIM_SetCompare4(TIM2, key);}
}

PWM.h文件：

#ifndef __PWM_H
#define __PWM_Hvoid PWM_Init(void);void SET_PWM(uint16_t num, uint16_t key);#endif

main.c主函数文件：

#include "stm32f10x.h"                  // Device header
#include "OLED.h"
#include "PWM.h"int main(void)
{OLED_Init();       //oled  屏幕初始化PWM_Init();SET_PWM(1, 10);   //设置通道1的占空比为10%SET_PWM(2, 20);   //设置通道2的占空比为20%SET_PWM(3, 30);   //设置通道3的占空比为30%SET_PWM(4, 40);   //设置通道4的占空比为40%while(1){}
}

其实整个过程只是增加了一个函数而已：这个函数就是：

好了，自己理解吧。