/**
  ******************************************************************************
  * @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 "py32md420xx_ll_Start_Kit.h"

/* Private define ------------------------------------------------------------*/
#define ADC_CALIBRATION_TIMEOUT_MS         ((uint32_t) 1)
#define VDDA_APPLI                         ((uint32_t)3300)
#define VAR_CONVERTED_DATA_INIT_VALUE      (__LL_ADC_DIGITAL_SCALE(LL_ADC_RESOLUTION_12B) + 1)

/* Private variables ---------------------------------------------------------*/
__IO uint32_t ADCxConvertedDatas[4];
__IO uint16_t uhADCxConvertedData               = VAR_CONVERTED_DATA_INIT_VALUE;
__IO uint16_t uhADCxConvertedData_Voltage_mVolt = 0;

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

/**
  * @brief  Main program.
  * @param  None
  * @retval int
  */
int main(void)
{
  /* Configure system clock */
  APP_SystemClockConfig();

  /* Initialize LED */
  BSP_LED_Init(LED_GREEN);

  /* Initialize debug USART (used for printf) */
  BSP_USART_Config();
  
  /* Reset ADC clock */
  LL_ADC_Reset(ADC1);
  
  /* Enable ADC1 clock */
  LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_ADC1);

  /* Configure DMA */
  APP_DmaConfig();

  /* Configure ADC parameters */
  APP_AdcConfig();
  
  /* ADC calibration */
  APP_AdcCalibrate();

  /* Enable ADC */
  APP_AdcEnable();

  /* Start ADC conversion */
  LL_ADC_REG_StartConversion(ADC1);

  while (1)
  {
    /* LED blinking */
    BSP_LED_Toggle(LED_GREEN);

    LL_mDelay(1000);

    /* Enable ADC */
    APP_AdcEnable();
    
    /* Start ADC conversion */
    LL_ADC_REG_StartConversion(ADC1);
  }
}

/**
  * @brief  ADC configuration function
  * @param  None
  * @retval None
  */
static void APP_AdcConfig(void)
{
  /* Enable GPIOA clock */
  LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA);

  /* Configure pins PA4/5/6/7 as analog inputs */
  LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_4| LL_GPIO_PIN_5| LL_GPIO_PIN_6  \
                     | LL_GPIO_PIN_7, LL_GPIO_MODE_ANALOG);

  /* ADC channel and clock source should be configured when ADEN=0, others should be configured when ADSTART=0 */
  /* Configure internal conversion channel */
  LL_ADC_SetCommonPathInternalCh(__LL_ADC_COMMON_INSTANCE(ADC1), LL_ADC_PATH_INTERNAL_NONE);

  /* Set ADC clock */
  LL_ADC_SetClock(ADC1, LL_ADC_CLOCK_SYNC_PCLK_DIV8);

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

  /* Set data alignment to right */
  LL_ADC_SetDataAlignment(ADC1, LL_ADC_DATA_ALIGN_RIGHT);

  /* Set low power mode */
  LL_ADC_SetLowPowerMode(ADC1, LL_ADC_LP_AUTOWAIT);

  /* Set channel conversion time */
  LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_4, LL_ADC_SAMPLINGTIME_41CYCLES_5);
  LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_5, LL_ADC_SAMPLINGTIME_41CYCLES_5);
  LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_6, LL_ADC_SAMPLINGTIME_41CYCLES_5);
  LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_7, LL_ADC_SAMPLINGTIME_41CYCLES_5);
  
  /* Set trigger source as software */
  LL_ADC_REG_SetTriggerSource(ADC1, LL_ADC_REG_TRIG_SOFTWARE);

  /* Set conversion mode to single */
  LL_ADC_REG_SetContinuousMode(ADC1, LL_ADC_REG_CONV_SINGLE);

  /* Set DMA mode to unlimited */
  LL_ADC_REG_SetDMATransfer(ADC1, LL_ADC_REG_DMA_TRANSFER_UNLIMITED);

  /* Set overrun management mode to data overwritten */
  LL_ADC_REG_SetOverrun(ADC1, LL_ADC_REG_OVR_DATA_OVERWRITTEN);

  /* Set scan direction to forward */
  LL_ADC_REG_SetSequencerScanDirection(ADC1,LL_ADC_REG_SEQ_SCAN_DIR_FORWARD);

  /* Set discontinuous mode to disabled */
  LL_ADC_REG_SetSequencerDiscont(ADC1, LL_ADC_REG_SEQ_DISCONT_DISABLE);

  /* Set channels 4/5/6/7 as conversion channels */
  LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_1 ,LL_ADC_CHANNEL_4);
  LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_2 ,LL_ADC_CHANNEL_5);
  LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_3 ,LL_ADC_CHANNEL_6);
  LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_4 ,LL_ADC_CHANNEL_7);
}

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

  if (LL_ADC_IsEnabled(ADC1) == 0)
  {
    /* Disable ADC DMA transfer during calibration */
    backup_setting_adc_dma_transfer = LL_ADC_REG_GetDMATransfer(ADC1);
    LL_ADC_REG_SetDMATransfer(ADC1, LL_ADC_REG_DMA_TRANSFER_NONE);

    /* Enable 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)
      /* Check if calibration is timeout */
      if (LL_SYSTICK_IsActiveCounterFlag())
      {
        if(Timeout-- == 0)
        {
          APP_ErrorHandler();
        }
      }
#endif
    }

    /* Delay between ADC calibration end and ADC enable: minimum 4 ADC Clock cycles */
    LL_mDelay(1);

    /* Restore ADC DMA configuration */
    LL_ADC_REG_SetDMATransfer(ADC1, backup_setting_adc_dma_transfer);
  }
}

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

  /* ADC stabilization time, minimum 8 ADC Clock cycles */
  LL_mDelay(1);
}

/**
  * @brief  DMA configuration function
  * @param  None
  * @retval None
  */
static void APP_DmaConfig()
{
  /* Enable DMA1 clock */
  LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_DMA1);

  /* Enable syscfg clock */
  LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_SYSCFG);

  /* ADC corresponds to channel LL_DMA_CHANNEL_1 */
  LL_SYSCFG_SetDMARemap(DMA1,LL_DMA_CHANNEL_1, LL_SYSCFG_DMA_MAP_ADC);

  /* Configure DMA data transfer direction as peripheral to memory */
  LL_DMA_SetDataTransferDirection(DMA1, LL_DMA_CHANNEL_1, LL_DMA_DIRECTION_PERIPH_TO_MEMORY);

  /* Configure DMA priority as high */
  LL_DMA_SetChannelPriorityLevel(DMA1, LL_DMA_CHANNEL_1, LL_DMA_PRIORITY_HIGH);

  /* Configure DMA in circular mode */
  LL_DMA_SetMode(DMA1, LL_DMA_CHANNEL_1, LL_DMA_MODE_CIRCULAR);

  /* Configure DMA peripheral increment mode as no increment */
  LL_DMA_SetPeriphIncMode(DMA1, LL_DMA_CHANNEL_1, LL_DMA_PERIPH_NOINCREMENT);

  /* Configure DMA memory increment mode as increment */
  LL_DMA_SetMemoryIncMode(DMA1, LL_DMA_CHANNEL_1, LL_DMA_MEMORY_INCREMENT);

  /* Configure DMA peripheral data size as word */
  LL_DMA_SetPeriphSize(DMA1, LL_DMA_CHANNEL_1, LL_DMA_PDATAALIGN_WORD);

  /* Configure DMA memory data size as word */
  LL_DMA_SetMemorySize(DMA1, LL_DMA_CHANNEL_1, LL_DMA_MDATAALIGN_WORD);

  /* Configure DMA data length as 4 */
  LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_1, 4);

  /* Configure DMA peripheral and memory addresses */
  LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_1, (uint32_t)&ADC1->DR,\
                         (uint32_t)ADCxConvertedDatas, LL_DMA_GetDataTransferDirection(DMA1, LL_DMA_CHANNEL_1));

  /* Enable DMA transfer complete interrupt */
  LL_DMA_EnableIT_TC(DMA1, LL_DMA_CHANNEL_1);

  /* DMA interrupt configuration */
  NVIC_SetPriority(DMA1_Channel1_IRQn, 0);
  NVIC_EnableIRQ(DMA1_Channel1_IRQn);

  /* Enable DMA */
  LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_1);
}

/**
  * @brief  DMA transfer complete callback function
  * @param  None
  * @retval None
  */
void APP_DMATransferCompleteCallback()
{
  for(int i=0; i<4; i++)
  {
    uhADCxConvertedData_Voltage_mVolt = __LL_ADC_CALC_DATA_TO_VOLTAGE(VDDA_APPLI, \
                                        ADCxConvertedDatas[i], LL_ADC_RESOLUTION_12B);
    printf("%s%d%s%umV\r\n","Channel",i+4," : ",(unsigned int)uhADCxConvertedData_Voltage_mVolt);
  }
}

/**
  * @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******************/
