GD32F3x0_Firmware_Library/Examples/ADC/Regular_channel_discontinuous_mode/main.c

/*!
    \file  main.c
    \brief ADC discontinuous mode for regular channel 
*/

/*
    Copyright (C) 2017 GigaDevice

    2017-06-06, V1.0.0, firmware for GD32F3x0
*/

#include "gd32f3x0.h"
#include "systick.h"
#include <stdio.h>
#include "main.h"
#include "gd32f3x0_eval.h"

uint16_t adc_value[16];

void rcu_config(void);
void gpio_config(void);
void dma_config(void);
void adc_config(void);

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

int main(void)
{
    /* system clocks configuration */
    rcu_config();
    /* systick configuration */
    systick_config();  
    /* GPIO configuration */
    gpio_config();
    /* DMA configuration */
    dma_config();
    /* ADC configuration */
    adc_config();
  
    while(1){
        /* delay 1s */
        delay_1ms(1000);
        /* ADC software trigger enable */
        adc_software_trigger_enable(ADC_REGULAR_CHANNEL);
    }
}

/*!
    \brief      configure the different system clocks
    \param[in]  none
    \param[out] none
    \retval     none
*/
void rcu_config(void)
{
    /* enable GPIOC clock */
    rcu_periph_clock_enable(RCU_GPIOA);
    /* enable ADC clock */
    rcu_periph_clock_enable(RCU_ADC);
    /* enable DMA clock */
    rcu_periph_clock_enable(RCU_DMA);
    /* config ADC clock */
    rcu_adc_clock_config(RCU_ADCCK_APB2_DIV6);
}

/*!
    \brief      configure the GPIO peripheral
    \param[in]  none
    \param[out] none
    \retval     none
*/
void gpio_config(void)
{
    /* config the GPIO as analog mode */ 
    gpio_mode_set(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3);
    gpio_mode_set(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7);
}

/*!
    \brief      configure the DMA peripheral
    \param[in]  none
    \param[out] none
    \retval     none
*/
void dma_config(void)
{
    /* ADC_DMA_channel configuration */
    dma_parameter_struct dma_data_parameter;
    
    /* ADC DMA_channel configuration */
    dma_deinit(DMA_CH0);
    
    /* initialize DMA single data mode */
    dma_data_parameter.periph_addr  = (uint32_t)(&ADC_RDATA);
    dma_data_parameter.periph_inc   = DMA_PERIPH_INCREASE_DISABLE;
    dma_data_parameter.memory_addr  = (uint32_t)(&adc_value);
    dma_data_parameter.memory_inc   = DMA_MEMORY_INCREASE_ENABLE;
    dma_data_parameter.periph_width = DMA_PERIPHERAL_WIDTH_16BIT;
    dma_data_parameter.memory_width = DMA_MEMORY_WIDTH_16BIT;  
    dma_data_parameter.direction    = DMA_PERIPHERAL_TO_MEMORY;
    dma_data_parameter.number       = 16;
    dma_data_parameter.priority     = DMA_PRIORITY_HIGH;
    dma_init(DMA_CH0, dma_data_parameter);

    dma_circulation_enable(DMA_CH0);
  
    /* enable DMA channel */
    dma_channel_enable(DMA_CH0);
}

/*!
    \brief      configure the ADC peripheral
    \param[in]  none
    \param[out] none
    \retval     none
*/
void adc_config(void)
{
    /* ADC trigger config */
    adc_external_trigger_source_config(ADC_REGULAR_CHANNEL, ADC_EXTTRIG_REGULAR_NONE); 
    /* ADC data alignment config */
    adc_data_alignment_config(ADC_DATAALIGN_RIGHT);
    /* ADC channel length config */
    adc_channel_length_config(ADC_REGULAR_CHANNEL, 8);

    /* ADC regular channel config */
    adc_regular_channel_config(0, ADC_CHANNEL_0, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(1, ADC_CHANNEL_1, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(2, ADC_CHANNEL_2, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(3, ADC_CHANNEL_3, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(4, ADC_CHANNEL_4, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(5, ADC_CHANNEL_5, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(6, ADC_CHANNEL_6, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(7, ADC_CHANNEL_7, ADC_SAMPLETIME_55POINT5);

    adc_external_trigger_config(ADC_REGULAR_CHANNEL, ENABLE);

    /* ADC discontinuous mode */
    adc_discontinuous_mode_config(ADC_REGULAR_CHANNEL, 3);

    /* enable ADC interface */
    adc_enable();
    delay_1ms(1);

    /* ADC calibration and reset calibration */
    adc_calibration_enable();

    /* ADC DMA function enable */
    adc_dma_mode_enable();
}