2019年09月26日 | stm32-4路pwm优化

/*********************************************************

TIM3输出4路pwm,单独控制占空比

**********************************************************/

#ifndef _PWM_

#define _PWM_

#include "stm32f10x.h"

#define  CLOCK 72000

void set_pwm1(u32 arr,u16 psc);

void set_pwm2(u32 arr,u16 psc);

void set_pwm3(u32 arr,u16 psc);

void set_pwm4(u32 arr,u16 psc);

/*******************************************************************************

* 函 数 名         :PWM4_Init(u16 arr,u16 psc)

* 函数功能     : 4路pwm初始化函数

* 输    入         : 频率，分频

频率：

//Fpwm = 72M / ((arr+1)*(psc+1))(单位：Hz)

* 输    出         : 无

*******************************************************************************/

void PWM4_Init(u32 arr, u32 psc);

#endif

tim_pwm4.c

/*********************************************************

TIM1输出4路pwm,单独控制占空比

**********************************************************/

#include "tim_pwm4.h"

//PWM输出初始化

//arr：自动重装值

//psc：时钟预分频数

void set_pwm1(u32 arr,u16 psc)

{

double T_ARR,DPwm_CCR2;

T_ARR=(double)72000000/arr; 

DPwm_CCR2=(double)(T_ARR * psc)/10000;

T_ARR=T_ARR+0.5;//四舍五入算法

DPwm_CCR2=DPwm_CCR2+0.5;//四舍五入算法

// PWM_Config_step((u16)T_ARR, (u16)DPwm_CCR2, 1);

TIM1->ARR = (u16)T_ARR;

TIM1->CCR1 =DPwm_CCR2;

}

void set_pwm2(u32 arr,u16 psc)

{

double T_ARR,DPwm_CCR2;

T_ARR=(double)72000000/arr; 

DPwm_CCR2=(double)(T_ARR * psc)/10000;

T_ARR=T_ARR+0.5;//四舍五入算法

DPwm_CCR2=DPwm_CCR2+0.5;//四舍五入算法

// PWM_Config_step((u16)T_ARR, (u16)DPwm_CCR2, 1);

TIM1->ARR = (u16)T_ARR;

TIM1->CCR2 =DPwm_CCR2;

}

void set_pwm3(u32 arr,u16 psc)

{

double T_ARR,DPwm_CCR2;

T_ARR=(double)72000000/arr; 

DPwm_CCR2=(double)(T_ARR * psc)/10000;

T_ARR=T_ARR+0.5;//四舍五入算法

DPwm_CCR2=DPwm_CCR2+0.5;//四舍五入算法

// PWM_Config_step((u16)T_ARR, (u16)DPwm_CCR2, 1);

TIM1->ARR = (u16)T_ARR;

TIM1->CCR3 =DPwm_CCR2;

}

void set_pwm4(u32 arr,u16 psc)

{

double T_ARR,DPwm_CCR2;

T_ARR=(double)72000000/arr; 

DPwm_CCR2=(double)(T_ARR * psc)/10000;

T_ARR=T_ARR+0.5;//四舍五入算法

DPwm_CCR2=DPwm_CCR2+0.5;//四舍五入算法

// PWM_Config_step((u16)T_ARR, (u16)DPwm_CCR2, 1);

TIM1->ARR = (u16)T_ARR;

TIM1->CCR4 =DPwm_CCR2;

}

void PWM4_Init(u32 arr,u32 psc)

{  

         GPIO_InitTypeDef GPIO_InitStructure;

        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

        TIM_OCInitTypeDef  TIM_OCInitStructure;

        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_TIM1 , ENABLE);  //使能GPIO外设时钟使能

   //设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11 ; //TIM_CH1

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出

        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

        GPIO_Init(GPIOA, &GPIO_InitStructure);

        TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值         80K

        TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  不分频

        TIM_TimeBaseStructure.TIM_ClockDivision =0; //设置时钟分割:TDTS = Tck_tim

        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式

        TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

//TIM1通道一

        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2

        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能

        TIM_OCInitStructure.TIM_Pulse = 100;  /*占空长度 0 – 周期(max)*/

        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性高

        TIM_OC1Init(TIM1, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx

//TIM1通道二

  TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable;

  TIM_OCInitStructure.TIM_Pulse = 100; /*占空长度 0 – 周期(max)*/

  TIM_OC2Init(TIM1, &TIM_OCInitStructure);

  TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);

//TIM1通道三

  TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable;

  TIM_OCInitStructure.TIM_Pulse = 100; /*占空长度 0 – 周期(max)*/

  TIM_OC3Init(TIM1, &TIM_OCInitStructure);

  TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);

//TIM1通道四

  TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable;

  TIM_OCInitStructure.TIM_Pulse = 100; /*占空长度 0 – 周期(max)*/

  TIM_OC4Init(TIM1, &TIM_OCInitStructure);

  TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);

  TIM_CtrlPWMOutputs(TIM1,ENABLE);        //MOE 主输出使能        

  TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器

        TIM_Cmd(TIM1, ENABLE);  //使能TIM1

}