ADC — ADC 不连续模式

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#include "gd32f30x.h"
#include "systick.h"
#include <stdio.h>
#include "gd32f307c_eval.h"

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();
    /* configure COM port */
    gd_eval_com_init(EVAL_COM0);
    /* DMA configuration */
    dma_config();
    /* ADC configuration */
    adc_config();

    while(1){
        /* delay 1s */
        delay_1ms(1000);
        printf("\r\n ***********************************\r\n");
        printf("\r\n ADC0 routine channel data 0, PA0 = %04X \r\n", adc_value[0]);
        printf("\r\n ADC0 routine channel data 1, PA1 = %04X \r\n", adc_value[1]);
        printf("\r\n ADC0 routine channel data 2, PA2 = %04X \r\n", adc_value[2]);
        printf("\r\n ADC0 routine channel data 3, PA3 = %04X \r\n", adc_value[3]);
        printf("\r\n ADC0 routine channel data 4, PA4 = %04X \r\n", adc_value[4]);
        printf("\r\n ADC0 routine channel data 5, PA5 = %04X \r\n", adc_value[5]);
        printf("\r\n ADC0 routine channel data 6, PA6 = %04X \r\n", adc_value[6]);
        printf("\r\n ADC0 routine channel data 7, PA7 = %04X \r\n", adc_value[7]);
    }
}

void rcu_config(void)
{
    /* enable GPIOA clock */
    rcu_periph_clock_enable(RCU_GPIOA);
    /* enable ADC0 clock */
    rcu_periph_clock_enable(RCU_ADC0);
    /* enable DMA0 clock */
    rcu_periph_clock_enable(RCU_DMA0);
    /* config ADC clock */
    rcu_adc_clock_config(RCU_CKADC_CKAPB2_DIV4);
}

void gpio_config(void)
{
    /* config the GPIO as analog mode */
    gpio_init(GPIOA, GPIO_MODE_AIN, GPIO_OSPEED_MAX, GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3);
    gpio_init(GPIOA, GPIO_MODE_AIN, GPIO_OSPEED_MAX, GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7);
    /* config the GPIO as floating input mode, for EXTI */
    gpio_init(GPIOA, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_MAX,GPIO_PIN_11);
}

void dma_config(void)
{
    /* ADC_DMA_channel configuration */
    dma_parameter_struct dma_data_parameter;

    /* ADC DMA_channel configuration */
    dma_deinit(DMA0, DMA_CH0);

    /* initialize DMA single data mode */
    dma_data_parameter.periph_addr = (uint32_t)(&ADC_RDATA(ADC0));
    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 = 8;
    dma_data_parameter.priority = DMA_PRIORITY_HIGH;
    dma_init(DMA0, DMA_CH0, &dma_data_parameter);

    dma_circulation_enable(DMA0, DMA_CH0);

    /* enable DMA channel */
    dma_channel_enable(DMA0, DMA_CH0);
}

void adc_config(void)
{
    /* ADC continuous function disable */
    adc_special_function_config(ADC0, ADC_CONTINUOUS_MODE, DISABLE);
    adc_special_function_config(ADC0, ADC_SCAN_MODE, DISABLE);
    /* ADC trigger config */
    adc_external_trigger_source_config(ADC0, ADC_ROUTINE_CHANNEL, ADC0_1_EXTTRIG_ROUTINE_EXTI_11); 
    /* ADC data alignment config */
    adc_data_alignment_config(ADC0, ADC_DATAALIGN_RIGHT);
    /* ADC mode config */
    adc_mode_config(ADC_MODE_FREE); 
    /* ADC channel length config */
    adc_channel_length_config(ADC0, ADC_ROUTINE_CHANNEL, 8);

    /* ADC DMA function enable */
    adc_dma_mode_enable(ADC0);

    /* ADC routine channel config */
    adc_routine_channel_config(ADC0, 0, ADC_CHANNEL_0, ADC_SAMPLETIME_55POINT5);
    adc_routine_channel_config(ADC0, 1, ADC_CHANNEL_1, ADC_SAMPLETIME_55POINT5);
    adc_routine_channel_config(ADC0, 2, ADC_CHANNEL_2, ADC_SAMPLETIME_55POINT5);
    adc_routine_channel_config(ADC0, 3, ADC_CHANNEL_3, ADC_SAMPLETIME_55POINT5);
    adc_routine_channel_config(ADC0, 4, ADC_CHANNEL_4, ADC_SAMPLETIME_55POINT5);
    adc_routine_channel_config(ADC0, 5, ADC_CHANNEL_5, ADC_SAMPLETIME_55POINT5);
    adc_routine_channel_config(ADC0, 6, ADC_CHANNEL_6, ADC_SAMPLETIME_55POINT5);
    adc_routine_channel_config(ADC0, 7, ADC_CHANNEL_7, ADC_SAMPLETIME_55POINT5);

    adc_external_trigger_config(ADC0, ADC_ROUTINE_CHANNEL, ENABLE);

    /* ADC discontinuous mode */
    adc_discontinuous_mode_config(ADC0, ADC_ROUTINE_CHANNEL, 3);

    /* enable ADC interface */
    adc_enable(ADC0);
    delay_1ms(1);
    /* ADC calibration and reset calibration */
    adc_calibration_enable(ADC0);
}

void exti_config(void)
{
    /* connect EXTI line to GPIO pin for routine sequence */
    gpio_exti_source_select(GPIO_PORT_SOURCE_GPIOA, GPIO_PIN_SOURCE_11);
    /* configure EXTI line for routine sequence */
    exti_init(EXTI_11, EXTI_EVENT, EXTI_TRIG_RISING);
    exti_flag_clear(EXTI_11);
}