/**
 * @file adc.c
 * @author Ethan.Tao (tzj0429@163.com)
 * @brief 
 * @version 0.1
 * @date 2020-12-13
 * 
 * @copyright Copyright (c)  
 * 
 */
#include "adc.h"
#include "gpio.h"
#include "gd32e23x_adc.h"
static __IO uint16_t ad_value[2];
static void ADC_GPIOCfg(void)
{
    /* enable DMA clock */
    rcu_periph_clock_enable(RCU_DMA);

    /* enable ADC clock */
    rcu_periph_clock_enable(RCU_ADC);

    gpio_mode_set(CURRENT_AI_PORT, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, CURRENT_AI_PIN);
    gpio_mode_set(VOLTAGE_AI_PORT, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, VOLTAGE_AI_PIN);
}
static void ADC_DMAconfig(void)
{
    dma_parameter_struct dma_init_struct;

    /* initialize DMA channel0 */
    dma_deinit(DMA_CH0);
    dma_init_struct.direction = DMA_PERIPHERAL_TO_MEMORY;
    dma_init_struct.memory_addr = (uint32_t)ad_value;
    dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
    dma_init_struct.memory_width = DMA_MEMORY_WIDTH_16BIT;
    dma_init_struct.number = 2;
    dma_init_struct.periph_addr = (uint32_t) & (ADC_RDATA);
    dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
    dma_init_struct.periph_width = DMA_PERIPHERAL_WIDTH_16BIT;
    dma_init_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
    dma_init(DMA_CH0, &dma_init_struct);

    /* configure DMA mode */
    dma_circulation_enable(DMA_CH0);
    dma_memory_to_memory_disable(DMA_CH0);

    /* enable DMA channel0 */
    dma_channel_enable(DMA_CH0);
}
extern void ADC_Init(void)
{
    ADC_GPIOCfg();
    ADC_DMAconfig();
    /* ADC channel length config */
    adc_channel_length_config(ADC_REGULAR_CHANNEL, 2); //¹æÔò×é ¹²2¸öͨµÀ

    /* ADC regular channel config */
    adc_regular_channel_config(0, ADC_CHANNEL_1, ADC_SAMPLETIME_7POINT5);
    adc_regular_channel_config(1, ADC_CHANNEL_2, ADC_SAMPLETIME_7POINT5);

    /* ADC external trigger enable */
    adc_external_trigger_config(ADC_REGULAR_CHANNEL, ENABLE);
    /* ADC external trigger source config */
    adc_external_trigger_source_config(ADC_REGULAR_CHANNEL, ADC_EXTTRIG_REGULAR_T0_CH2);
    /* ADC data alignment config */
    adc_data_alignment_config(ADC_DATAALIGN_RIGHT);
    /* enable ADC interface */
    adc_enable();
    /* ADC calibration and reset calibration */
    adc_calibration_enable();
    /* ADC DMA function enable */
    adc_dma_mode_enable();
}

extern uint16_t ADC_GetChannleValue(uint8_t ch)
{
    while (!dma_flag_get(DMA_CH0, DMA_FLAG_FTF))
        ;
    /* clear channel0 transfer complete flag */
    dma_flag_clear(DMA_CH0, DMA_FLAG_FTF);
    return ad_value[ch];
}