GD32F303 ADC例程

以下是基于GD32F303芯片的ADC例程，你可以参考：

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

#define ADC_GPIO_PORT       GPIOA
#define ADC_GPIO_PIN        GPIO_PIN_0
#define ADC_GPIO_CLK        RCU_GPIOA
#define ADC_DMA_CHANNEL     DMA_CH0
#define ADC_DMA_CLK         RCU_DMA0
#define ADC_DMA_IRQ         DMA0_Channel0_IRQn
#define ADC_DMA_IRQHANDLER  DMA0_Channel0_IRQHandler

uint16_t adc_value[16];

void adc_gpio_config(void);
void adc_config(void);
void dma_config(void);

int main(void) 
{
    // 使能GPIOA时钟
    rcu_periph_clock_enable(ADC_GPIO_CLK);

    // 配置GPIOA.0为模拟输入
    adc_gpio_config();

    // 配置ADC
    adc_config();

    // 配置DMA
    dma_config();

    // 启动DMA传输
    dma_channel_enable(DMA0, ADC_DMA_CHANNEL);

    while (1) 
    {
        // 等待DMA传输完成
        while(!dma_flag_get(DMA0, ADC_DMA_CHANNEL, DMA_FLAG_FTF));

        // 输出ADC值
        for(int i = 0; i < 16; i++)
        {
            printf("ADC%d value: %d\n", i, adc_value[i]);
        }

        // 清除DMA传输完成标志位
        dma_flag_clear(DMA0, ADC_DMA_CHANNEL, DMA_FLAG_FTF);
    }
}

void adc_gpio_config(void)
{
    gpio_init(ADC_GPIO_PORT, GPIO_MODE_AIN, GPIO_OSPEED_50MHZ, ADC_GPIO_PIN);
}

void adc_config(void)
{
    // 使能ADC时钟
    rcu_periph_clock_enable(RCU_ADC0);

    // ADC时钟分频
    adc_clock_config(ADC_ADCCK_PCLK2_DIV8);

    // ADC模式配置
    adc_mode_config(ADC_MODE_FREE);

    // ADC通道配置
    adc_channel_length_config(ADC_REGULAR_CHANNEL, 16);
    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_regular_channel_config(8, ADC_CHANNEL_8, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(9, ADC_CHANNEL_9, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(10, ADC_CHANNEL_10, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(11, ADC_CHANNEL_11, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(12, ADC_CHANNEL_12, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(13, ADC_CHANNEL_13, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(14, ADC_CHANNEL_14, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(15, ADC_CHANNEL_15, ADC_SAMPLETIME_55POINT5);

    // ADC DMA配置
    adc_dma_mode_enable();
    adc_dma_request_after_last_enable();

    // ADC使能
    adc_enable();
    delay_1ms(1);
    adc_calibration_enable();
    delay_1ms(1);
    adc_software_trigger_enable(ADC_REGULAR_CHANNEL);
}

void dma_config(void)
{
    // 使能DMA时钟
    rcu_periph_clock_enable(ADC_DMA_CLK);

    // DMA通道配置
    dma_deinit(DMA0, ADC_DMA_CHANNEL);
    dma_init_struct.direction = DMA_PERIPHERAL_TO_MEMORY;
    dma_init_struct.memory_addr = (uint32_t)adc_value;
    dma_init_struct.memory_inc = DMA_MEMORY_INC_ENABLE;
    dma_init_struct.memory_width = DMA_MEMORY_WIDTH_16BIT;
    dma_init_struct.number = 16;
    dma_init_struct.periph_addr = (uint32_t)&ADC_RDATA(ADC0);
    dma_init_struct.periph_inc = DMA_PERIPH_INC_DISABLE;
    dma_init_struct.periph_width = DMA_PERIPHERAL_WIDTH_16BIT;
    dma_init_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
    dma_init(DMA0, ADC_DMA_CHANNEL, &dma_init_struct);

    // DMA中断配置
    nvic_irq_enable(ADC_DMA_IRQ, 0, 0);
    dma_interrupt_enable(DMA0, ADC_DMA_CHANNEL, DMA_INT_FTF);
}

void ADC_DMA_IRQHANDLER(void)
{
    dma_interrupt_flag_clear(DMA0, ADC_DMA_CHANNEL, DMA_INT_FTF);
}

需要注意的是，这个例程使用了DMA传输来获取ADC采样值，因此在使用之前需要先配置DMA。同时，在输出ADC值之前需要等待DMA传输完成。