TIM3 输出两路PWM PBO和PB1

只看该作者 · 2014-7-22 19:19

void TIM3_PWM_Init(u16 val_1,u16 val_2)          //¶¨Ê±Æ÷3  Êä³öPWM
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1; //TIM_CH1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //??????
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

TIM_DeInit(TIM3);
TIM_TimeBaseInitStructure.TIM_Period = 20000;                      // ???????
TIM_TimeBaseInitStructure.TIM_Prescaler =71 ;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCNPolarity_Low;
TIM_OCInitStructure.TIM_Pulse = val_1;
TIM_OCInitStructure.TIM_OutputNState = ENABLE;
TIM_OC3Init(TIM3,&TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM3,TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_Pulse = val_2;
TIM_OC4Init(TIM3,&TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM3,TIM_OCPreload_Enable);

TIM_CtrlPWMOutputs(TIM3,ENABLE);

TIM_ARRPreloadConfig(TIM3,ENABLE);
TIM_Cmd(TIM3,ENABLE);
}