Exemplo n.º 1
0
/**
  * @brief  Configure the TIMx time base unit.
  * @param  TIMx Timer Instance
  * @param  TIM_InitStruct pointer to a @ref LL_TIM_InitTypeDef structure (TIMx time base unit configuration data structure)
  * @retval An ErrorStatus enumeration value:
  *          - SUCCESS: TIMx registers are de-initialized
  *          - ERROR: not applicable
  */
ErrorStatus LL_TIM_Init(TIM_TypeDef *TIMx, LL_TIM_InitTypeDef *TIM_InitStruct)
{
  uint32_t tmpcr1 = 0U;

  /* Check the parameters */
  assert_param(IS_TIM_INSTANCE(TIMx));
  assert_param(IS_LL_TIM_COUNTERMODE(TIM_InitStruct->CounterMode));
  assert_param(IS_LL_TIM_CLOCKDIVISION(TIM_InitStruct->ClockDivision));

  tmpcr1 = LL_TIM_ReadReg(TIMx, CR1);

  if (IS_TIM_COUNTER_MODE_SELECT_INSTANCE(TIMx))
  {
    /* Select the Counter Mode */
    MODIFY_REG(tmpcr1, (TIM_CR1_DIR | TIM_CR1_CMS), TIM_InitStruct->CounterMode);
  }

  if (IS_TIM_CLOCK_DIVISION_INSTANCE(TIMx))
  {
    /* Set the clock division */
    MODIFY_REG(tmpcr1, TIM_CR1_CKD, TIM_InitStruct->ClockDivision);
  }

  /* Write to TIMx CR1 */
  LL_TIM_WriteReg(TIMx, CR1, tmpcr1);

  /* Set the Autoreload value */
  LL_TIM_SetAutoReload(TIMx, TIM_InitStruct->Autoreload);

  /* Set the Prescaler value */
  LL_TIM_SetPrescaler(TIMx, TIM_InitStruct->Prescaler);

  if (IS_TIM_REPETITION_COUNTER_INSTANCE(TIMx))
  {
    /* Set the Repetition Counter value */
    LL_TIM_SetRepetitionCounter(TIMx, TIM_InitStruct->RepetitionCounter);
  }

  /* Generate an update event to reload the Prescaler
     and the repetition counter value (if applicable) immediately */
  LL_TIM_GenerateEvent_UPDATE(TIMx);

  return SUCCESS;
}
Exemplo n.º 2
0
void TI_TriggerInit(void)
{
	uint32_t TIM2_clk;

  /******************************/
  /* Peripheral clocks enabling */
  /******************************/
  /* Enable the peripheral clock of GPIOs */
  LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA);
  
  /* Enable the peripheral clock of TIM2 */
  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_TIM2);

  /*************************/
  /* GPIO AF configuration */
  /*************************/
  /* GPIO TIM2_CH1 configuration */
  LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_5, LL_GPIO_MODE_ALTERNATE);
  LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_5, LL_GPIO_PULL_DOWN);
  LL_GPIO_SetPinSpeed(GPIOA, LL_GPIO_PIN_5, LL_GPIO_SPEED_FREQ_HIGH);
  LL_GPIO_SetAFPin_0_7(GPIOA, LL_GPIO_PIN_5, LL_GPIO_AF_1);

  /* GPIO TIM2_CH2 configuration */
  LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_1, LL_GPIO_MODE_ALTERNATE);
  LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_1, LL_GPIO_PULL_DOWN);
  LL_GPIO_SetPinSpeed(GPIOA, LL_GPIO_PIN_1, LL_GPIO_SPEED_FREQ_HIGH);
  LL_GPIO_SetAFPin_0_7(GPIOA, LL_GPIO_PIN_1, LL_GPIO_AF_1);
  
  /*******************************/
  /* Input trigger configuration */
  /*******************************/
  /* Map TI2FP2 on TI2 */
  LL_TIM_IC_SetActiveInput(TIM2, LL_TIM_CHANNEL_CH2, LL_TIM_ACTIVEINPUT_DIRECTTI);
  
  /* TI2FP2 must detect a rising edge */
  LL_TIM_IC_SetPolarity(TIM2, LL_TIM_CHANNEL_CH2, LL_TIM_IC_POLARITY_RISING);
  
  /* Configure TI2FP2 as trigger */
  LL_TIM_SetTriggerInput(TIM2, LL_TIM_TS_TI2FP2);
  
  /* Enable the slave mode controller: TI2FP2 is used to start the counter */
  LL_TIM_SetSlaveMode(TIM2, LL_TIM_SLAVEMODE_TRIGGER);
  
  /*********************************/
  /* Output waveform configuration */
  /*********************************/
  /* Select counter mode: counting up */
  LL_TIM_SetCounterMode(TIM2, LL_TIM_COUNTERMODE_UP);
  
  /* Set the one pulse mode: generate only 1 pulse */
  LL_TIM_SetOnePulseMode(TIM2, LL_TIM_ONEPULSEMODE_SINGLE);
  
  /* In this example TIM2 input clock (TIM2CLK) is set to APB1 clock (PCLK1), */
  /* since APB1 pre-scaler is equal to /2*2 = 1.                             */
  /*    TIM2CLK = PCLK1                                                     */
  /*    PCLK1 = HCLK                                                          */
  /*    => TIM2CLK = SystemCoreClock (32 MHz)                               */  
  TIM2_clk = SystemCoreClock/1;

  /* Set the TIM2 prescaler to get counter clock frequency at 2 kHz */ 
  LL_TIM_SetPrescaler(TIM2, __LL_TIM_CALC_PSC(TIM2_clk, 2000));
  
  /* Set the capture/compare register to get a pulse delay of 2s (2000000 us)*/
  LL_TIM_OC_SetCompareCH1(TIM2, __LL_TIM_CALC_DELAY(TIM2_clk, LL_TIM_GetPrescaler(TIM2), 2000000));
  
  /* Set the autoreload register to get a pulse length of 3s (3000000 us)*/
  LL_TIM_SetAutoReload(TIM2, __LL_TIM_CALC_PULSE(TIM2_clk, LL_TIM_GetPrescaler(TIM2), 2000000, 3000000));
  
  /* Set output channel 1 in PWM2 mode */
  LL_TIM_OC_SetMode(TIM2,  LL_TIM_CHANNEL_CH1,  LL_TIM_OCMODE_PWM2);
  
  /* Configure output channel 1 configuration */
  LL_TIM_OC_ConfigOutput(TIM2, LL_TIM_CHANNEL_CH1, LL_TIM_OCPOLARITY_HIGH);
  
  /**************************/
  /* Start pulse generation */
  /**************************/
  /* Enable channel 1 */
  LL_TIM_CC_EnableChannel(TIM2, LL_TIM_CHANNEL_CH1);
  
  /* Enable auto-reload register preload */
  LL_TIM_EnableARRPreload(TIM2);

  /* Force update generation */
  LL_TIM_GenerateEvent_UPDATE(TIM2);
}