/********************************** (C) COPYRIGHT *******************************
 * File Name          : main.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2019/10/15
 * Description        : Main program body.
 * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
 * SPDX-License-Identifier: Apache-2.0
 *******************************************************************************/ 

/*
 *@Note
 外部触发ADC转换例程：
 ADC通道2(PA2)-注入组通道，外部触发引脚(PA15)高电平触发 EXTI线15 事件，
 该模式下，通过 EXTI线15 事件触发一次ADC转换，转换结束后产生JEOC中断。

*/

#include "debug.h"

/* Global Variable */
s16 Calibrattion_Val = 0;


/*********************************************************************
 * @fn      ADC_Function_Init
 *
 * @brief   Initializes ADC collection.
 *
 * @return  none
 */
void ADC_Function_Init( void )
{
    ADC_InitTypeDef ADC_InitStructure = {0};
    GPIO_InitTypeDef GPIO_InitStructure = {0};
    NVIC_InitTypeDef NVIC_InitStructure = {0};

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE );
    RCC_APB2PeriphClockCmd( RCC_APB2Periph_ADC1, ENABLE );
    RCC_ADCCLKConfig( RCC_PCLK2_Div8 );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init( GPIOA, &GPIO_InitStructure );

    ADC_DeInit( ADC1 );
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigInjecConv_Ext_IT15_TIM8_CC4;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
    ADC_Init( ADC1, &ADC_InitStructure );

    ADC_InjectedSequencerLengthConfig( ADC1, 1 );
    ADC_InjectedChannelConfig( ADC1, ADC_Channel_2, 1, ADC_SampleTime_239Cycles5 );
    ADC_ExternalTrigInjectedConvCmd( ADC1, ENABLE );

    NVIC_InitStructure.NVIC_IRQChannel = ADC1_2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init( &NVIC_InitStructure );

    ADC_ITConfig( ADC1, ADC_IT_JEOC, ENABLE );
    ADC_Cmd( ADC1, ENABLE );

    ADC_ResetCalibration( ADC1 );
    while( ADC_GetResetCalibrationStatus( ADC1 ) );
    ADC_StartCalibration( ADC1 );
    while( ADC_GetCalibrationStatus( ADC1 ) );
    Calibrattion_Val = Get_CalibrationValue( ADC1 );
}

/*********************************************************************
 * @fn      EXTI_Event_Init
 *
 * @brief   Initializes EXTI.
 *
 * @return  none
 */
void EXTI_Event_Init( void )
{
    EXTI_InitTypeDef EXTI_InitStructure = {0};
    GPIO_InitTypeDef GPIO_InitStructure = {0};

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE );
    RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO, ENABLE );

    GPIO_EXTILineConfig( GPIO_PortSourceGPIOA, GPIO_PinSource15 );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
    GPIO_Init( GPIOA, &GPIO_InitStructure );

    EXTI_InitStructure.EXTI_Line = EXTI_Line15;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Event;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init( &EXTI_InitStructure );
}

/*********************************************************************
 * @fn      Get_ConversionVal1
 *
 * @brief   Get Conversion Value.
 *
 * @param   val - Sampling value
 *
 * @return  val+Calibrattion_Val - Conversion Value.
 */
u16 Get_ConversionVal( s16 val )
{
    if( ( val + Calibrattion_Val ) < 0 )
    {
        return 0;
    }
    if( ( Calibrattion_Val + val ) > 4095 )
    {
        return 4095;
    }
    return ( val + Calibrattion_Val );
}

/*********************************************************************
 * @fn      ADC1_2_IRQHandler
 *
 * @brief   ADC1_2 Interrupt Service Function.
 *
 * @return  none
 */
void ADC1_2_IRQHandler()
{
    u16 ADC_val;

    if( ADC_GetITStatus( ADC1, ADC_IT_JEOC ) )
    {
        printf( "ADC Extline trigger conversion...\r\n" );
        ADC_val = ADC_GetInjectedConversionValue( ADC1, ADC_InjectedChannel_1 );
        printf( "JADC%04d\r\n", Get_ConversionVal( ADC_val ) );
    }

    ADC_ClearITPendingBit( ADC1, ADC_IT_JEOC );
}

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main( void )
{
    USART_Printf_Init( 115200 );
    printf( "SystemClk:%d\r\n", SystemCoreClock );

    ADC_Function_Init();
    printf( "CalibrattionValue:%d\n", Calibrattion_Val );

    EXTI_Event_Init();

    while( 1 );
}




