/**
  ******************************************************************************
  * @file    main.c
  * @author  MCU Application Team
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2023 Puya Semiconductor Co.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by Puya under BSD 3-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-3-Clause
  *
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-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-3-Clause
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "py32f032xx_ll_Start_Kit.h"

/* Private define ------------------------------------------------------------*/
#define ADC_CALIBRATION_TIMEOUT_MS         5

/* Private variables ---------------------------------------------------------*/
__IO uint32_t wait_loop_index = 0;

/* Private user code ---------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static void APP_SystemClockConfig(void);
static void APP_AdcConfig(void);
static void APP_AdcCalibrate(void);
static void APP_AdcEnable(void);

/**
  * @brief  Main program.
  * @param  None
  * @retval int
  */
int main(void)
{
  /* Enable SYSCFG and PWR clock */
  LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_SYSCFG);
  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);

  /* Configure system clock */
  APP_SystemClockConfig();

  /* Initialize UART (for printf use) */
  BSP_UART_Config();

  /* ADC configuration */
  APP_AdcConfig();

  /* ADC Calibrate */
  APP_AdcCalibrate();
   
  /* ADC Enable */   
  APP_AdcEnable();

  while (1)
  {   
    LL_ADC_REG_StartConversion(ADC1);
    while(LL_ADC_IsActiveFlag_EOS(ADC1)==0)
    {

    }
    LL_ADC_ClearFlag_EOS(ADC1);
    printf("Channel4: %umV\r\n",(2048*LL_ADC_REG_ReadConversionData12(ADC1)/4095));
    LL_mDelay(1000);
  }
}

/**
  * @brief  ADC calibration function.
  * @param  None
  * @retval None
  */
static void APP_AdcCalibrate()
{
  #if (USE_TIMEOUT == 1)
  uint32_t Timeout = 0; /* Variable used for timeout management */
  #endif /* USE_TIMEOUT */
  
  if (LL_ADC_IsEnabled(ADC1) == 0)
  { 
    /* Clear EOCAL */
    LL_ADC_ClearFlag_EOCAL(ADC1);

    LL_ADC_StartCalibration(ADC1,LL_ADC_CALIBRATION_NUMBER_1);
    
    /* Poll for ADC effectively calibrated */
    #if (USE_TIMEOUT == 1)
    Timeout = ADC_CALIBRATION_TIMEOUT_MS;
    #endif /* USE_TIMEOUT */
    
    while (LL_ADC_IsActiveFlag_EOCAL(ADC1) != 1)
    {
    #if (USE_TIMEOUT == 1)
      /* Check Systick counter flag to decrement the time-out value */
      if (LL_SYSTICK_IsActiveCounterFlag())
      {
        if(Timeout-- == 0)
        {
          APP_ErrorHandler();
        }
      }
    #endif /* USE_TIMEOUT */
    }   

    wait_loop_index = (LL_ADC_DELAY_CALIB_ENABLE_ADC_CYCLES >> 1);
    while(wait_loop_index != 0)
    {
      wait_loop_index--;
    }  
  }
}

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

  /* Enable ADC */
  LL_ADC_Enable(ADC1);

  while(LL_ADC_IsActiveFlag_ADRDY(ADC1)==0);
}

/**
  * @brief ADC1 Initialization Function
  * @param None
  * @retval None
  */
static void APP_AdcConfig(void)
{
  LL_ADC_InitTypeDef ADC_InitStruct = {0};
  LL_ADC_REG_InitTypeDef ADC_REG_InitStruct = {0};

  /* Set ADC Clock Source Sysclk */
  LL_RCC_SetADCClockSource(LL_RCC_ADC_CLKSOURCE_SYSCLK);

  LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_ADC1);
  LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA);
  LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_VREFBUF);

  /* Configure pins PA4 as analog */
  LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_4, LL_GPIO_MODE_ANALOG);

  ADC_InitStruct.Resolution = LL_ADC_RESOLUTION_12B;                                              /* Resolution 12 */
  ADC_InitStruct.DataAlignment = LL_ADC_DATA_ALIGN_RIGHT;                                         /* DataAlignment Right */
  ADC_InitStruct.LowPowerMode = LL_ADC_LP_MODE_NONE;                                              /* LowPowerMode None */
  LL_ADC_Init(ADC1, &ADC_InitStruct);

  ADC_REG_InitStruct.TriggerSource = LL_ADC_REG_TRIG_SOFTWARE;                                    /* Trigger Software */
  ADC_REG_InitStruct.SequencerLength = LL_ADC_REG_SEQ_SCAN_DISABLE;                               /* Scan Disable */
  ADC_REG_InitStruct.SequencerDiscont = LL_ADC_REG_SEQ_DISCONT_DISABLE;                           /* Discont Disable */
  ADC_REG_InitStruct.ContinuousMode = LL_ADC_REG_CONV_SINGLE;                                     /* Mode Single */
  ADC_REG_InitStruct.DMATransfer = LL_ADC_REG_DMA_TRANSFER_NONE;                                  /* DMA transfer none */ 
  ADC_REG_InitStruct.Overrun = LL_ADC_REG_OVR_DATA_OVERWRITTEN;                                   /* Overrun overwriten*/
  LL_ADC_REG_Init(ADC1, &ADC_REG_InitStruct);

  LL_ADC_SetCommonClock(ADC_COMMON,LL_ADC_CLOCK_SYNC_PCLK_DIV4);

  LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_1, LL_ADC_CHANNEL_4);                        /* Channel 4 */
  LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_4, LL_ADC_SAMPLINGTIME_640CYCLES_5);         /* Sampletime 640.5 */

  LL_VREFBUF_SetVrefbufVoltage(LL_VREFBUF_Voltage_2P048V);                                        /* VrefBufVoltage 2.048V */
  LL_VREFBUF_Enable();                                                                            /* VrefBuf Enable */

  LL_ADC_SetReference(__LL_ADC_COMMON_INSTANCE(ADC1),LL_ADC_REFERENCE_VREFBUF);                   /* ADC Reference Vrefbuf */ 
}

/**
  * @brief  Configure system clock
  * @param  None
  * @retval None
  */
static void APP_SystemClockConfig(void)
{
  /* Enable HSI */
  LL_RCC_HSI_Enable();
  while(LL_RCC_HSI_IsReady() != 1)
  {
  }

  /* Set AHB prescaler: HCLK = SYSCLK */
  LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);

  /* Select HSISYS as system clock source */
  LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSISYS);
  while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSISYS)
  {
  }

  /* Set APB prescaler: PCLK = HCLK */
  LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
  LL_Init1msTick(8000000);

  /* Update the SystemCoreClock global variable(which can be updated also through SystemCoreClockUpdate function) */
  LL_SetSystemCoreClock(8000000);
}

/**
  * @brief  Error executing function.
  * @param  None
  * @retval None
  */
void APP_ErrorHandler(void)
{
  while (1)
  {
  }
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* Users can add their own printing information as needed,
     for example: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* Infinite loop */
  while (1)
  {
  }
}
#endif /* USE_FULL_ASSERT */

/************************ (C) COPYRIGHT Puya *****END OF FILE******************/
