/********************************** (C) COPYRIGHT *******************************
* File Name          : main.c
* Author             : WCH
* Version            : V1.0.0
* Date               : 2021/08/08
* Description        : Main program body.
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* SPDX-License-Identifier: Apache-2.0
*******************************************************************************/

/*
 *@Note
 模拟看门狗例程：
 ADC通道2(PA2),检测该规则组通道上 ADC转换数据为 2000 - 3500 之外触发模拟
 看门狗中断。

*/

#include "debug.h"

/*********************************************************************
 * @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_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
    ADC_Init( ADC1, &ADC_InitStructure );

    ADC_RegularChannelConfig( ADC1, ADC_Channel_2, 1, ADC_SampleTime_239Cycles5 );

    /* Higher Threshold:3500, Lower Threshold:2000 */
    ADC_AnalogWatchdogThresholdsConfig( ADC1, 3500, 2000 );
    ADC_AnalogWatchdogSingleChannelConfig( ADC1, ADC_Channel_2 );
    ADC_AnalogWatchdogCmd( ADC1, ADC_AnalogWatchdog_SingleRegEnable );

    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_AWD, ENABLE );
    ADC_Cmd( ADC1, ENABLE );

    ADC_BufferCmd( ADC1, DISABLE ); //disable buffer
    ADC_ResetCalibration( ADC1 );
    while( ADC_GetResetCalibrationStatus( ADC1 ) );
    ADC_StartCalibration( ADC1 );
    while( ADC_GetCalibrationStatus( ADC1 ) );
    ADC_BufferCmd( ADC1, ENABLE ); //enable buffer
}

/*********************************************************************
 * @fn      Get_ADC_Val
 *
 * @brief   Returns ADCx conversion result data.
 *
 * @param   ch - ADC channel.
 *            ADC_Channel_0 - ADC Channel0 selected.
 *            ADC_Channel_1 - ADC Channel1 selected.
 *            ADC_Channel_2 - ADC Channel2 selected.
 *            ADC_Channel_3 - ADC Channel3 selected.
 *            ADC_Channel_4 - ADC Channel4 selected.
 *            ADC_Channel_5 - ADC Channel5 selected.
 *            ADC_Channel_6 - ADC Channel6 selected.
 *            ADC_Channel_7 - ADC Channel7 selected.
 *            ADC_Channel_8 - ADC Channel8 selected.
 *            ADC_Channel_9 - ADC Channel9 selected.
 *            ADC_Channel_10 - ADC Channel10 selected.
 *            ADC_Channel_11 - ADC Channel11 selected.
 *            ADC_Channel_12 - ADC Channel12 selected.
 *            ADC_Channel_13 - ADC Channel13 selected.
 *            ADC_Channel_14 - ADC Channel14 selected.
 *            ADC_Channel_15 - ADC Channel15 selected.
 *            ADC_Channel_16 - ADC Channel16 selected.
 *            ADC_Channel_17 - ADC Channel17 selected.
 *
 * @return  none
 */
u16 Get_ADC_Val( u8 ch )
{
    u16 val;

    ADC_SoftwareStartConvCmd( ADC1, ENABLE );

    while( !ADC_GetFlagStatus( ADC1, ADC_FLAG_EOC ) );

    val = ADC_GetConversionValue( ADC1 );

    return val;
}

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main( void )
{
    u16 ADC_val;

    NVIC_PriorityGroupConfig( NVIC_PriorityGroup_4 );
    Delay_Init();
    USART_Printf_Init( 115200 );
    printf( "SystemClk:%d\r\n", SystemCoreClock );

    ADC_Function_Init();

    while( 1 )
    {
        ADC_val = Get_ADC_Val( ADC_Channel_2 );
        Delay_Ms( 500 );
        printf( "%04d\r\n", ADC_val );
        Delay_Ms( 2 );
    }
}

/*********************************************************************
 * @fn      ADC1_2_IRQHandler
 *
 * @brief   This function handles analog wathdog exception.
 *
 * @return  none
 */
void ADC1_2_IRQHandler( void )
{
    if( ADC_GetITStatus( ADC1, ADC_IT_AWD ) )
    {
        printf( "Enter AnalogWatchdog Interrupt\r\n" );
    }

    ADC_ClearITPendingBit( ADC1, ADC_IT_AWD );
}
