/*!
    \file  main.c
    \brief ADC channel of temperature and Vref 
*/

/*
    Copyright (C) 2017 GigaDevice

    2017-02-10, V1.0.0, firmware for GD32F30x
*/

#include "gd32f30x.h"
#include "systick.h"
#include <stdio.h>
#include "main.h"
#include "gd32f30x_eval.h"


float temperature;
float vref_value;

void rcu_config(void);
void adc_config(void);

/*!
    \brief      main function
    \param[in]  none
    \param[out] none
    \retval     none
*/

int main(void)
{
    /* configure systick */
    systick_config();  
    /* system clocks configuration */
    rcu_config();
    /* ADC configuration */
    adc_config();
    /* USART configuration */
    gd_eval_com_init(EVAL_COM1);


    while(1){
        /* ADC software trigger enable */
        adc_software_trigger_enable(ADC0, ADC_INSERTED_CHANNEL);
        /* delay a time in milliseconds */
        delay_1ms(2000);
      
        /* value convert */
        temperature = (1.43 - ADC_IDATA0(ADC0)*3.3/4096) * 1000 / 4.3 + 25;
        vref_value = (ADC_IDATA1(ADC0) * 3.3 / 4096);
      
        /* value print */
        printf(" the temperature data is %2.0f degrees Celsius\r\n", temperature);
        printf(" the reference voltage data is %5.3fV \r\n", vref_value);
        printf(" \r\n");
    }

}

/*!
    \brief      configure the different system clocks
    \param[in]  none
    \param[out] none
    \retval     none
*/
void rcu_config(void)
{
    /* enable ADC clock */
    rcu_periph_clock_enable(RCU_ADC0);
    /* config ADC clock */
    rcu_adc_clock_config(RCU_CKADC_CKAPB2_DIV4);
}


/*!
    \brief      configure the ADC peripheral
    \param[in]  none
    \param[out] none
    \retval     none
*/
void adc_config(void)
{
    /* ADC SCAN function enable */
    adc_special_function_config(ADC0, ADC_SCAN_MODE, ENABLE);
    adc_special_function_config(ADC1, ADC_CONTINUOUS_MODE, DISABLE); 
    /* ADC trigger config */
    adc_external_trigger_source_config(ADC0, ADC_INSERTED_CHANNEL, ADC0_1_2_EXTTRIG_INSERTED_NONE);
    /* ADC mode config */
    adc_mode_config(ADC_MODE_FREE);
    /* ADC data alignment config */
    adc_data_alignment_config(ADC0, ADC_DATAALIGN_RIGHT);  
    /* ADC channel length config */
    adc_channel_length_config(ADC0, ADC_INSERTED_CHANNEL, 2);

  
    /* ADC temperature sensor channel config */
    adc_inserted_channel_config(ADC0, 0, ADC_CHANNEL_16, ADC_SAMPLETIME_239POINT5);
    /* ADC internal reference voltage channel config */
    adc_inserted_channel_config(ADC0, 1, ADC_CHANNEL_17, ADC_SAMPLETIME_239POINT5);

    adc_external_trigger_config(ADC0, ADC_INSERTED_CHANNEL, ENABLE);
  
    /* ADC temperature and Vrefint enable */
    adc_tempsensor_vrefint_enable();
 
    
    /* enable ADC interface */
    adc_enable(ADC0);
    delay_1ms(1);
    /* ADC calibration and reset calibration */
    adc_calibration_enable(ADC0);
}

/* retarget the C library printf function to the USART */
int fputc(int ch, FILE *f)
{
    usart_data_transmit(EVAL_COM1, (uint8_t) ch);
    while (RESET == usart_flag_get(EVAL_COM1,USART_FLAG_TBE));
    return ch;
}
