STM32 4路PWM配置函数

硬件连接：战舰STM32F103ZET6或其他

实验目标：通过调制占空比调节多路PWM控制LED的明暗；

#include "pwm.h"

#include "led.h"

//PWM输出初始化

//arr：自动重装值

//psc：时钟预分频数

void TIM3_PWM_Init(u16 arr,u16 psc)

{

GPIO_InitTypeDef GPIO_InitStructure;

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_OCInitTypeDef TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);//

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB , 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_Mode = GPIO_Mode_AF_PP; //复用推挽输出

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1 ; //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(GPIOB, &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(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

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 = 300; //设置待装入捕获比较寄存器的脉冲值

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

TIM_OC1Init(TIM3, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx

TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_Pulse = 150;

TIM_OC2Init(TIM3, &TIM_OCInitStructure);

TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_Pulse = 150;

TIM_OC3Init(TIM3, &TIM_OCInitStructure);

TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_Pulse = 150;

TIM_OC4Init(TIM3, &TIM_OCInitStructure);

TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);

TIM_CtrlPWMOutputs(TIM3,ENABLE); //MOE 主输出使能

TIM_ARRPreloadConfig(TIM3, ENABLE); //使能TIMx在ARR上的预装载寄存器

TIM_Cmd(TIM3, ENABLE); //使能TIM1

}

.#include "led.h"

#include "delay.h"

#include "sys.h"

#include "pwm.h"

int main(void)

{

u16 led0pwmval=150;

u16 led1pwmval=150;

u16 led2pwmval=150;

u16 led3pwmval=150;

u8 dir=1;

u16 math=0;

delay_init(); //延时函数初始化

LED_Init(); //初始化与LED连接的硬件接口

TIM3_PWM_Init(899,0);//不分频。PWM频率=72000/(899+1)=80Khz

while(1)

{

delay_ms(10);

math++;

if(math)

{

delay_ms(10);

if(dir)

{led0pwmval++;led1pwmval++;led2pwmval++;led3pwmval++;}

else {led0pwmval--;led1pwmval--;led2pwmval--;led3pwmval--;}

if(led0pwmval>600||led1pwmval>600||led2pwmval>600||led3pwmval>600) dir=0;

if(led0pwmval==0||led1pwmval==0||led2pwmval==0||led3pwmval==0) dir=1;

math=0;

}

TIM_SetCompare1(TIM3,led0pwmval);

TIM_SetCompare2(TIM3,led1pwmval);

TIM_SetCompare3(TIM3,led2pwmval);

TIM_SetCompare4(TIM3,led3pwmval);

}

}

方法二：

void PWM_Configuration(void)//PWM初始化函数

{

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;//定时器初始化结构

TIM_OCInitTypeDef TIM_OCInitStructure;//通道输出初始化结构

GPIO_InitTypeDefGPIO_InitStructure;//输出通道的GPIO管脚结构

//(1)TIM3初始化,时间基部分

TIM_TimeBaseStructure.TIM_Period=（1000-1）; //周期0～999

TIM_TimeBaseStructure.TIM_Prescaler =（72-1）; //时钟分频

TIM_TimeBaseStructure.TIM_ClockDivision =TIM_CKD_DIV1; //时钟分割

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

TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure); //初始化

//TIM_ITConfig(TIM3, TIM_IT_CC4,ENABLE); //打开中断，中断需要这行代码

//(2)TIM3通道初始化 ，CCP部分

TIM_OCStructInit(&TIM_OCInitStructure); //默认参数

TIM_OCInitStructure.TIM_OCMode =TIM_OCMode_PWM1; //工作状态

TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable; //设定为输出，需要PWM输出才需要这行代码

TIM_OCInitStructure.TIM_Pulse =250; //占空长度

TIM_OCInitStructure.TIM_OCPolarity =TIM_OCPolarity_High; //高电平

TIM_OC4Init(TIM3,&TIM_OCInitStructure); //通道初始化

TIM_OCInitStructure.TIM_OCMode =TIM_OCMode_PWM1; //工作状态

TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable; //设定为输出，需要PWM输出才需要这行代码

TIM_OCInitStructure.TIM_Pulse =500; //占空长度

TIM_OCInitStructure.TIM_OCPolarity =TIM_OCPolarity_High; //高电平

TIM_OC3Init(TIM3,&TIM_OCInitStructure); //通道初始化

TIM_OC3Init(TIM3, &TIM_OCInitStructure);

TIM_OCInitStructure.TIM_OCMode =TIM_OCMode_PWM1; //工作状态

TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable; //设定为输出，需要PWM输出才需要这行代码

TIM_OCInitStructure.TIM_Pulse =750; //占空长度

TIM_OCInitStructure.TIM_OCPolarity =TIM_OCPolarity_High; //高电平

TIM_OC2Init(TIM3, &TIM_OCInitStructure);

TIM_OCInitStructure.TIM_OCMode =TIM_OCMode_PWM1; //工作状态

TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable; //设定为输出，需要PWM输出才需要这行代码

TIM_OCInitStructure.TIM_Pulse =900; //占空长度