STM32学习之使用TIM产生频率和占空比可调的PWM波

ID:75926 · 发表于 2015-4-10 17:30

先配置GPIO:

void GPIO_Configuration()

{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;//复用推免输出

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_Init(GPIOB,&GPIO_InitStructure);

}

使用TIM的PWM波不需要中断所以不需要配置NVIC;

void TIM_Configuration(float x)

{

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;//设置TIM的结构体

TIM_OCInitTypeDef TIM_OCInitStructure;//设置TIM PWM的结构体

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;

TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;

TIM_TimeBaseStructure.TIM_Period=999;

TIM_TimeBaseStructure.TIM_Prescaler=0;

TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM2;//使用PWM2功能

TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;//跳变后变成高电平

TIM_OCInitStructure.TIM_Pulse=(short)(x*999);//跳变值

TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;

TIM_OC3Init(TIM3,&TIM_OCInitStructure);

TIM_OC3PreloadConfig(TIM3,TIM_OCPreload_Enable);

TIM_Cmd(TIM3,ENABLE);

TIM_ARRPreloadConfig(TIM3, ENABLE);

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