stm32l053的comparator驱动及中断

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stary666 发布时间：2015-4-9 15:57

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uint16_t
ComparatorInitial(void)
{
uint32_t u32_StsCheckimeOut;

GPIOPinInitial(LOOP_POSITIVE_ISOLLATED_MONITOR_PORT, LOOP_POSITIVE_ISOLLATED_MONITOR_PIN_NUMBER, GPIO_MOD_ANALOG_FUNCTION, GPIO_NOPUPD);

/* Enable the VREFINT by setting EN_VREFINT bit in the CFGR3 register */
RCC->APB2ENR    |= (RCC_APB2ENR_SYSCFGEN);
SYSCFG->CFGR3    |= SYSCFG_CFGR3_EN_BGAP;
/* Enable the Buffer for the COMP by setting EN_VREFINT bit and the ENBUFLP_VREFINT_COMP in the CFGR3 register */
SYSCFG->CFGR3    |= (SYSCFG_CFGR3_ENBUFLP_BGAP_COMP | SYSCFG_CFGR3_EN_BGAP);
// CLEAR CSR
COMP2->CSR       =  0;
COMP2->CSR       |= (COMP_CSR_COMP2INPSEL_PA3);
#if ((LOOP_POSITIVE_ISOLLATED_MONITOR_PORT == GPIO_A) && (LOOP_POSITIVE_ISOLLATED_MONITOR_PIN_NUMBER == 3))
COMP2->CSR       |= (COMP_CSR_COMP2INPSEL_PA3 | COMP_CSR_COMP2INNSEL_VREFINT_3_DIV_4);
#elif ((LOOP_POSITIVE_ISOLLATED_MONITOR_PORT == GPIO_B) && (LOOP_POSITIVE_ISOLLATED_MONITOR_PIN_NUMBER == 4))
COMP2->CSR       |= (COMP_CSR_COMP2INPSEL_PB4 | COMP_CSR_COMP2INNSEL_VREFINT_DIV4);
#else
COMP2->CSR       |= (COMP_CSR_COMP2INPSEL_PA3 | COMP_CSR_COMP2INNSEL_VREFINT_3_DIV_4);
#endif
COMP2->CSR       |= COMP_CSR_COMP2SPEED;
COMP2->CSR       &=  (~COMP_CSR_COMPxEN);
EXTI->FTSR       |= COMP_EXTI_LINE_COMP2_EVENT;
EXTI->RTSR       |= COMP_EXTI_LINE_COMP2_EVENT;
EXTI->IMR       |= COMP_EXTI_LINE_COMP2_EVENT;
EXTI->PR       |= COMP_EXTI_LINE_COMP2_EVENT;
// VREFINT Check
/* VREFINT reference for ADC enable bit*/
SYSCFG->CFGR3    |= (SYSCFG_CFGR3_ENBUF_BGAP_ADC);
u32_StsCheckimeOut = GET_SYSTEM_TICK_VALUE();

while (RESET == (SYSCFG->CFGR3  &= (~SYSCFG_VREFINT_ADC_RDYF)))
{
      if (GET_SYSTEM_TICK_ECLIPSE(u32_StsCheckimeOut) > CHECK_STATUS_TIMEROUT_TICK)
      {
         return ERROR;
      }
}

while (RESET == (SYSCFG->CFGR3  &= (~SYSCFG_CFGR3_VREFINT_COMP_RDYF)))
{
      if (GET_SYSTEM_TICK_ECLIPSE(u32_StsCheckimeOut) > CHECK_STATUS_TIMEROUT_TICK)
      {
         return ERROR;
      }
}

/*Configure the NVIC for COMP2 */
NVIC_SetPriority(ADC1_COMP_IRQn, INTERRUPT_PRIORITY_COMPARATOR);
NVIC_EnableIRQ(ADC1_COMP_IRQn);
return SUCCESS;
}

void
ComparatorConfig(FlagStatus enum_SetReset)
{
if (enum_SetReset == RESET)
{
      COMP2->CSR &=  (~COMP_CSR_COMPxEN);
}
else
{
      COMP2->CSR |=  COMP_CSR_COMPxEN;
}
}