PY32F002B/Src/user/emf_hal/hal_adc.c

/* 
*   BSD 2-Clause License
*   Copyright (c) 2022, LiteEMF
*   All rights reserved.
*   This software component is licensed by LiteEMF under BSD 2-Clause license,
*   the "License"; You may not use this file except in compliance with the
*   License. You may obtain a copy of the License at:
*       opensource.org/licenses/BSD-2-Clause
* 
*/

/************************************************************************************************************
**	Description:	
************************************************************************************************************/
#include "hw_config.h"
#include "hw_board.h"
// #ifdef HW_ADC_MAP
#if 1
#include  "api/api_adc.h"
#include "py32f002b_ll_adc.h"
/******************************************************************************************************
** Defined
*******************************************************************************************************/

/******************************************************************************************************
**	static Parameters
*******************************************************************************************************/

/******************************************************************************************************
**	public Parameters
*******************************************************************************************************/

/*****************************************************************************************************
**	static Function
******************************************************************************************************/
uint16_t irq_adc[m_adc_num];                //全局变量, 防止adc采样失败数据出错
uint8_t num = 0;

/*****************************************************************************************************
**  Function
******************************************************************************************************/
/**
  * @brief  ADC calibration program.
  * @param  None
  * @retval None
  */
static void APP_AdcCalibrate(void)
{
#if (USE_TIMEOUT == 1)
  uint32_t Timeout = 0;
#endif

  if (LL_ADC_IsEnabled(ADC1) == 0)
  {

    /* Enable ADC calibration */
    LL_ADC_StartCalibration(ADC1);

#if (USE_TIMEOUT == 1)
    Timeout = ADC_CALIBRATION_TIMEOUT_MS;
#endif

    while (LL_ADC_IsCalibrationOnGoing(ADC1) != 0)
    {
#if (USE_TIMEOUT == 1)
      /* Detects if the calibration has timed out */
      if (LL_SYSTICK_IsActiveCounterFlag())
      {
        if(Timeout-- == 0)
        {

        }
      }
#endif
    }

    /* The delay between the end of ADC calibration and ADC enablement is at least 4 ADC clocks */
    LL_mDelay(1);
  }
}

/**
  * @brief  Enable ADC.
  * @param  None
  * @retval None
  */
static void APP_AdcEnable(void)
{
  /* Enable ADC */
  LL_ADC_Enable(ADC1);

  /* The delay between ADC enablement and ADC stabilization is at least 8 ADC clocks */
  LL_mDelay(1);
}

/*******************************************************************
** Parameters:		
** Returns:	
** Description:		
*******************************************************************/
uint16_t hal_adc_to_voltage(uint16_t adc)
{
	return 0;
}
bool hal_adc_value(uint8_t id, uint16_t* valp)
{
	if(id >= m_adc_num) return false;
	valp = irq_adc[id];
	return true;
}
bool hal_adc_start_scan(void)
{
	return false;
}
bool hal_adc_init(void)
{
	uint8_t id;

  	LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_ADC1);

	for(id=0; id<m_adc_num; id++){
		get_gpio_rcc(m_adc_map[id].pin);
  		LL_GPIO_SetPinMode(get_gpio_port(m_adc_map[id].pin), get_gpio_pin(m_adc_map[id].pin), LL_GPIO_MODE_ANALOG);
	}

	/* Set ADC clock to pclk/4 */
	LL_ADC_SetClock(ADC1, LL_ADC_CLOCK_SYNC_PCLK_DIV4);  

	/* Set ADC resolution to 12 bit */
	LL_ADC_SetResolution(ADC1, LL_ADC_RESOLUTION_12B);

	/* ADC conversion data alignment: right aligned */
	LL_ADC_SetDataAlignment(ADC1, LL_ADC_DATA_ALIGN_RIGHT);

	/* No ADC low power mode activated */
	LL_ADC_SetLowPowerMode(ADC1, LL_ADC_LP_MODE_NONE);

	/* Sampling time 239.5 ADC clock cycles */
	LL_ADC_SetSamplingTimeCommonChannels(ADC1, LL_ADC_SAMPLINGTIME_239CYCLES_5);

	/* ADC regular group conversion trigger from external IP: TIM1 TRGO. */
	LL_ADC_REG_SetTriggerSource(ADC1, LL_ADC_REG_TRIG_EXT_TIM1_TRGO);

	/* Set Trigger edge to rising edge */
	LL_ADC_REG_SetTriggerEdge(ADC1, LL_ADC_REG_TRIG_EXT_RISING);

	/* Set ADC conversion mode to single mode: one conversion per trigger */
	LL_ADC_REG_SetContinuousMode(ADC1, LL_ADC_REG_CONV_SINGLE);

	/* ADC regular group behavior in case of overrun: data overwritten */
	LL_ADC_REG_SetOverrun(ADC1, LL_ADC_REG_OVR_DATA_OVERWRITTEN);

	/* Disable ADC regular group sequencer discontinuous mode  */
	LL_ADC_REG_SetSequencerDiscont(ADC1, LL_ADC_REG_SEQ_DISCONT_DISABLE);
	for(id=0; id<m_adc_num; id++){
		if(id == 0){
  			LL_ADC_REG_SetSequencerChannels(ADC1, ADC_CH_ATT(id));
		}else{
			LL_ADC_REG_SetSequencerChAdd(ADC1, ADC_CH_ATT(id));
		}
	}

	/* Dose not enable internal conversion channel */
	LL_ADC_SetCommonPathInternalCh(__LL_ADC_COMMON_INSTANCE(ADC1), LL_ADC_PATH_INTERNAL_VREFINT );
		
	/* Enable EOC IT */
	LL_ADC_EnableIT_EOC(ADC1);

	NVIC_SetPriority(ADC_COMP_IRQn,1);
	NVIC_EnableIRQ(ADC_COMP_IRQn);
		
	/*  ADC automatic self-calibration */
	APP_AdcCalibrate();

	/* Enable ADC */
	APP_AdcEnable();

	/* Start ADC conversion (if it is software triggered then start conversion directly) */
	LL_ADC_REG_StartConversion(ADC1);
	return true;
}
bool hal_adc_deinit(void)
{
	LL_ADC_Disable(ADC1);
	return false;
}

/******************************************************************************/
/*           Cortex-M0+ Processor Interruption and Exception Handlers         */
/******************************************************************************/
void ADC_COMP_IRQHandler(void)
{
	  /* Clear ADC EOC IT flag */
    LL_ADC_ClearFlag_EOC(ADC1);
	irq_adc[num++]=ADC1->DR;
    if(num >= m_adc_num) i = 0;
}
#endif