STM32刹车功能怎么配置和使用

只看该作者 · 2015-7-15 20:32

怎么停止PWM和启动PWM..

1万 · 2015-7-16 07:53

软件上带刹车功能的 PWM 定时器有个总的使能位,
硬件上使用刹车功能, 外部刹车(低有效)信号应该接 TIMx_BKIN 引脚.

只看该作者 · 2015-7-16 21:47

软件刹车就是直接利用定时器使能吗，如TIM_Cmd(TIM1, ENABLE);
硬件使能就是通过刹车接 TIMx_BKIN 引脚来控制吗？
只是我的大致代码，我刹车不会配置，能帮我看一下吗。给我指点一下刹车的配置。谢谢，

void TIM1_Config(void)
{
TIM_OCInitTypeDef       TIM_OCInitStructure;
TIM_BDTRInitTypeDef    TIM_BDTRInitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
GPIO_InitTypeDef       GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA |
                     RCC_APB2Periph_GPIOB |RCC_APB2Periph_AFIO, ENABLE);

  /* GPIOA Configuration: Channel 1, 2 and 3 as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 ;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* GPIOB Configuration: BKIN pin */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Mode =GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB, GPIO_Pin_12);

  TIM_TimeBaseStructure.TIM_Prescaler = 100;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period = 4095;
  TIM_TimeBaseStructure.TIM_ClockDivision =0;
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1 ;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 2047;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);

  TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
  TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
  TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
  TIM_BDTRInitStructure.TIM_DeadTime = 48;
  TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
  TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
  TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);

  TIM_CCPreloadControl(TIM1, ENABLE);
  TIM_ARRPreloadConfig(TIM1, ENABLE);
  TIM_Cmd(TIM1, ENABLE);
  TIM_CtrlPWMOutputs(TIM1, ENABLE);
}