电机驱动程序求问

7496zhanglu · 发表于 2017-12-6 15:30:02

用的是stm32f103zet6，使用定时器3的四个通道产生四个pwm波，但是测试发现PC7有问题，大神们请帮忙看看。
void pwm_Init(u16 arr,u16 psc)
{

GPIO_InitTypeDef  GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;//初始化TIM3的外设

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE);  //使能PB,PC端口时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

GPIO_PinRemapConfig(GPIO_FullRemap_TIM3,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9;                      //PC6789 pwm
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;          //
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;                               //PB567 dir  PA5  dir
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;          //
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// GPIO_ResetBits(GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7);          //PB8蜂鸣器

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;                                        //PA5 dir
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;          //
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler =psc;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式1  TIM_OCMode_PWM1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_Pulse = 0; //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);
TIM_OC1PreloadConfig(TIM3,TIM_OCPreload_Enable);//使能或者失能TIMx在CCR1上的预装载寄存器

// TIM_OCInitStructure.TIM_OutputState= TIM_OutputState_Enable;
//  TIM_OCInitStructure.TIM_Pulse =CCR2_Val;
  TIM_OC2Init(TIM3,&TIM_OCInitStructure);
  TIM_OC2PreloadConfig(TIM3,TIM_OCPreload_Enable);
//  TIM_OCInitStructure.TIM_OutputState= TIM_OutputState_Enable;
//  TIM_OCInitStructure.TIM_Pulse =CCR3_Val;
  TIM_OC3Init(TIM3,&TIM_OCInitStructure);
  TIM_OC3PreloadConfig(TIM3,TIM_OCPreload_Enable);
//  TIM_OCInitStructure.TIM_OutputState= TIM_OutputState_Enable;
//  TIM_OCInitStructure.TIM_Pulse =CCR4_Val;
  TIM_OC4Init(TIM3,&TIM_OCInitStructure);
  TIM_OC4PreloadConfig(TIM3,TIM_OCPreload_Enable);
  TIM_ARRPreloadConfig(TIM3,ENABLE);    //使能TIM3重载寄存器ARR
TIM_Cmd(TIM3,ENABLE);//使能TIM3
}
u8 val=0;
void qianjin(void)
{
TIM_SetCompare1(TIM3,val);
TIM_SetCompare2(TIM3,val);
TIM_SetCompare3(TIM3,val);
TIM_SetCompare4(TIM3,val);
GPIO_ResetBits(GPIOA,GPIO_Pin_5);
GPIO_SetBits(GPIOB,GPIO_Pin_5);
GPIO_SetBits(GPIOB,GPIO_Pin_6);
GPIO_SetBits(GPIOB,GPIO_Pin_7);
}
PC的6，8，9产生的pwm波正常，减减速和变向都没问题。
PC7直接是电机不转，查了表PC7也没有被占用，所以我不太明白，大神们赐教。
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