STM32 F407 PWM模板

void Pwm_Init(unsigned long Frequency, float DC1, float DC2, float DC3, float DC4)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;
 
  uint16_t TimerPeriod = 0;
  uint16_t Channel1Pulse = 0, Channel2Pulse = 0, Channel3Pulse = 0, Channel4Pulse = 0;
  
  /* Compute the value to be set in ARR regiter to generate signal frequency at 17.57 Khz */
  TimerPeriod = (SystemCoreClock / (Frequency << 1)) - 1;
  /* Compute CCR1 value to generate a duty cycle at 50% for channel 1 and 1N */
  Channel1Pulse = (uint16_t) (((uint32_t) DC1 * (TimerPeriod - 1)) / 100);
  /* Compute CCR2 value to generate a duty cycle at 37.5%  for channel 2 and 2N */
  Channel2Pulse = (uint16_t) (((uint32_t) DC2 * (TimerPeriod - 1)) / 100);
  /* Compute CCR3 value to generate a duty cycle at 25%  for channel 3 and 3N */
  Channel3Pulse = (uint16_t) (((uint32_t) DC3 * (TimerPeriod - 1)) / 100);
  /* Compute CCR4 value to generate a duty cycle at 12.5%  for channel 4 */
  Channel4Pulse = (uint16_t) (((uint32_t) DC4 * (TimerPeriod - 1)) / 100);

  /* TIM1 clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4 , ENABLE);
  
  /* Time Base configuration */
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

  /* Channel 1, 2,3 and 4 Configuration in PWM mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

  TIM_OC1Init(TIM4, &TIM_OCInitStructure);

  TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;
  TIM_OC2Init(TIM4, &TIM_OCInitStructure);

  TIM_OCInitStructure.TIM_Pulse = Channel3Pulse;
  TIM_OC3Init(TIM4, &TIM_OCInitStructure);

  TIM_OCInitStructure.TIM_Pulse = Channel4Pulse;
  TIM_OC4Init(TIM4, &TIM_OCInitStructure);

  /* TIM1 counter enable */
  TIM_Cmd(TIM4, ENABLE);

  /* TIM1 Main Output Enable */
  TIM_CtrlPWMOutputs(TIM4, ENABLE);
}


void Pwm_GPIO_Init(void)
{
   GPIO_InitTypeDef GPIO_InitStructure;
  /* GPIOA, GPIOB and GPIOE Clocks enable */
   RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOD, ENABLE);
  
  /* GPIOA Configuration: Channel 1, 3 and 4 as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
  GPIO_Init(GPIOD, &GPIO_InitStructure);
  
  GPIO_PinAFConfig(GPIOD, GPIO_PinSource12, GPIO_AF_TIM4);
  GPIO_PinAFConfig(GPIOD, GPIO_PinSource13, GPIO_AF_TIM4);
  GPIO_PinAFConfig(GPIOD, GPIO_PinSource14, GPIO_AF_TIM4);
  GPIO_PinAFConfig(GPIOD, GPIO_PinSource15, GPIO_AF_TIM4);
}