想利用一个timer3输出4路PWM，但是似乎不对，请指教。

98675972

代码如下：
/////////////////////////////////////
由于版本问题，所以汉字是乱码，不过比较简单，应该可以看懂。
////////////////////////////////////
#include "timer.h"
#include "usart.h"

void TIM3_Int_Init(u16 arr,u16 psc)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //????

TIM_TimeBaseStructure.TIM_Period = arr; //??????????????????????????? ???5000?500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //??????TIMx???????????  10Khz?????  
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //??????:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM??????
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //??TIM_TimeBaseInitStruct?????????TIMx???????
 
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //?????TIM3??,??????

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3??
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //?????0?
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //????3?
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ?????
NVIC_Init(&NVIC_InitStructure);  //??NVIC_InitStruct???????????NVIC???

TIM_Cmd(TIM3, ENABLE);  //??TIMx??
 
}
//???3??????
void TIM3_IRQHandler(void)  
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //?????TIM??????:TIM ??? 
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );  //??TIMx???????:TIM ??? 
}
}




//TIM3 PWM????? 
//PWM?????
//arr:?????
//psc:??????
//use TIM3 FOR 4 PWM
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); //?????3??
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  //??GPIO????

   //???????,??TIM3 CH2?PWM????
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //TIM_CH1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  //????
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);//???GPIO

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  //????
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);//???GPIO

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);  //??GPIOB????

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //TIM_CH3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  //????
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//???GPIO

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //TIM_CH4
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  //????
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//???GPIO

   //???TIM3
TIM_TimeBaseStructure.TIM_Period = arr; //???????????????????????????
TIM_TimeBaseStructure.TIM_Prescaler =psc; //??????TIMx??????????? 
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //??????:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM??????
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //??TIM_TimeBaseInitStruct?????????TIMx???????

//???TIM3 Channel2 PWM??  
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //???????:TIM????????1
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //??????
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //????:TIM???????
TIM_OC1Init(TIM3, &TIM_OCInitStructure);  //??T??????????TIM3 OC1

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //???????:TIM????????2
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //??????
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //????:TIM???????
TIM_OC2Init(TIM3, &TIM_OCInitStructure);  //??T??????????TIM3 OC2

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //???????:TIM????????1
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //??????
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //????:TIM???????
TIM_OC3Init(TIM3, &TIM_OCInitStructure);  //??T??????????TIM3 OC3

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //???????:TIM????????2
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //??????
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //????:TIM???????
TIM_OC4Init(TIM3, &TIM_OCInitStructure);  //??T??????????TIM3 OC4

TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);  //??TIM3?CCR1????????
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);  //??TIM3?CCR2????????
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);  //??TIM3?CCR3????????
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);  //??TIM3?CCR4????????

TIM_Cmd(TIM3, ENABLE);  //??TIM3
}

正点原子

自然是要选择复用输出。

98675972

发现了，是IO口输出模式不对，我选用通用推挽输出，软件仿真时没有反应，但是当我选用如图模式时，就可以了，但这是为什么呢？如果我下到STM32里，控制无刷电机时，应该选用那个模式呢？

98675972

如图，Altemate output Push-pull