ADC — ADC 温度 & Vref

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

void rcu_config(void);
void dma_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();
    /* DMA configuration */
    dma_config();
    /* ADC configuration */
    adc_config();
    /* USART configuration */
    gd_eval_com_init(EVAL_COM0);

    while(1){
        /* delay a time in milliseconds */
        delay_1ms(2000);

        /* value convert */
        temperature = (1.43 - adc_value[0]*3.3/4096) * 1000 / 4.3 + 25;
        vref_value = (adc_value[1] * 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");
    }
}

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

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       = 2;
    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 mode config */
    adc_mode_config(ADC_MODE_FREE);
    /* ADC contineous function disable */
    adc_special_function_config(ADC0, ADC_CONTINUOUS_MODE, ENABLE);
    /* ADC scan mode disable */
    adc_special_function_config(ADC0, ADC_SCAN_MODE, ENABLE);
    /* ADC data alignment config */
    adc_data_alignment_config(ADC0, ADC_DATAALIGN_RIGHT);

    /* ADC channel length config */
    adc_channel_length_config(ADC0, ADC_ROUTINE_CHANNEL, 2);
    /* ADC temperature sensor channel config */
    adc_routine_channel_config(ADC0, 0, ADC_CHANNEL_16, ADC_SAMPLETIME_239POINT5);
    /* ADC internal reference voltage channel config */
    adc_routine_channel_config(ADC0, 1, ADC_CHANNEL_17, ADC_SAMPLETIME_239POINT5);

    /* ADC trigger config */
    adc_external_trigger_source_config(ADC0, ADC_ROUTINE_CHANNEL, ADC0_1_2_EXTTRIG_ROUTINE_NONE);
    adc_external_trigger_config(ADC0, ADC_ROUTINE_CHANNEL, ENABLE);

    /* ADC temperature and Vrefint enable */
    adc_tempsensor_vrefint_enable();

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

    /* ADC software trigger enable */
    adc_software_trigger_enable(ADC0, ADC_ROUTINE_CHANNEL);
}