/********************************** (C) COPYRIGHT *******************************
 * File Name          : main.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2021/06/06
 * Description        : Main program body.
 *********************************************************************************
 * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
 * Attention: This software (modified or not) and binary are used for 
 * microcontroller manufactured by Nanjing Qinheng Microelectronics.
 *******************************************************************************/

/*
 *@Note
 *Touchkey detection routine:
 *This example demonstrates channel 2 (PA2), which is a Touchkey application.
 *
 */

#include "debug.h"

/* Global define */

/*********************************************************************
 * @fn      Touch_Key_Init
 *
 * @brief   Initializes Touch Key collection.
 *
 * @return  none
 */
void Touch_Key_Init(void)
{
	GPIO_InitTypeDef GPIO_InitStructure={0};
	ADC_InitTypeDef ADC_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_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_Cmd(ADC1, ENABLE);
	TKey1->CTLR1 |= (1<<26)|(1<<24);     // Enable TouchKey and Buffer
}

/*********************************************************************
 * @fn      Touch_Key_Adc
 *
 * @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  val - The Data conversion value.
 */
u16 Touch_Key_Adc(u8 ch)
{
  ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_7Cycles5 );
  TKey1->IDATAR1 =0x10;  //Charging Time
  TKey1->RDATAR =0x8;   //Discharging Time
  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));
  return (uint16_t) TKey1->RDATAR;

}

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

	SystemCoreClockUpdate();
	Delay_Init();
	USART_Printf_Init(115200);
	printf("SystemClk:%d\r\n",SystemCoreClock);
	printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );

	Touch_Key_Init();
	while(1)
	{
	    ADC_val = Touch_Key_Adc(ADC_Channel_2);
	    printf("TouckKey Value:%d\r\n",ADC_val);
	    Delay_Ms(500);
	}
}