大神求助，STM32F103 pwm输出问题。

zhoutao · 发表于 2017-10-26 17:17:41

想设置PB8、9、10、11为PWM输出模式，一直没有成功，望各位大侠看看。

初始化函数
void PWM_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
TIM_DeInit(TIM2);
TIM_DeInit(TIM4);
GPIO_AFIODeInit();

GPIO_PinRemapConfig(GPIO_PartialRemap2_TIM2, ENABLE);//¶Ë¿úÖØó3éä
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
//RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

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

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler =psc;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

TIM_OCStructInit(&TIM_OCInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_Pulse = 0;

TIM_OC3Init(TIM2,&TIM_OCInitStructure);
TIM_OC4Init(TIM2,&TIM_OCInitStructure);

TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);
TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable);

//TIM_Cmd(TIM2, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler =psc;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

//TIM_OCStructInit(&TIM_OCInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_Pulse = 0;

TIM_OC3Init(TIM4,&TIM_OCInitStructure);
TIM_OC4Init(TIM4,&TIM_OCInitStructure);

TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);
TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);

TIM_Cmd(TIM4, ENABLE);
TIM_Cmd(TIM2, ENABLE);
}

void PWM_MOTO(int16_t MOTO1_PWM,int16_t MOTO2_PWM,int16_t MOTO3_PWM,int16_t MOTO4_PWM)
{

   TIM4->CCR3 = MOTO1_PWM;
TIM4->CCR4 = MOTO2_PWM;
TIM2->CCR3 = MOTO3_PWM;
TIM2->CCR4 = MOTO4_PWM;

}

主函数

int main(void)
{

RCC_Configuration();
delay_init(72);
PWM_Init(899,1);

//LED_Init();
while(1)
{

delay_ms(1000);
delay_ms(1000);

PWM_MOTO(10,10,10,10);

delay_ms(1000);
delay_ms(1000);
PWM_MOTO(0,0,0,0);

//LED_1();

}

}