ADC — ADC 模拟看门狗

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#include "gd32f30x.h"
#include "systick.h"
#include <stdio.h>
#include "gd32f307c_eval.h"
#define BOARD_ADC_CHANNEL   ADC_CHANNEL_13
#define ADC_GPIO_PORT_RCU   RCU_GPIOC
#define ADC_GPIO_PORT       GPIOC
#define ADC_GPIO_PIN        GPIO_PIN_3
#define ADC_WATCHDOG_HT     0x0A00
#define ADC_WATCHDOG_LT     0x0400

void rcu_config(void);
void gpio_config(void);
void nvic_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);
    /* NVIC configuration */
    nvic_config();
    /* ADC configuration */
    adc_config();

    while(1){
        delay_1ms(1000);
        adc_value = adc_routine_data_read(ADC1);
        printf("\r\n ADC1 watchdog low threshold: %04X \r\n",ADC_WATCHDOG_LT);
        printf("\r\n ADC1 watchdog hgih threshold: %04X \r\n",ADC_WATCHDOG_HT);
        printf("\r\n ADC1 routine channel data = %04X \r\n",adc_value);
        printf("\r\n ***********************************\r\n");
        if(1 == data){
            /* turn off LED2 */
            if((adc_value < ADC_WATCHDOG_HT) && (adc_value > ADC_WATCHDOG_LT)){
                data = 0;
                gd_eval_led_off(LED2);
            }
        }
    }
}

void rcu_config(void)
{
    /* enable GPIOA clock */
    rcu_periph_clock_enable(ADC_GPIO_PORT_RCU);
    /* enable ADC1 clock */
    rcu_periph_clock_enable(RCU_ADC1);
    /* config ADC clock */
    rcu_adc_clock_config(RCU_CKADC_CKAPB2_DIV4);
}

void gpio_config(void)
{
    /* configure led GPIO */
    gd_eval_led_init(LED2);
    /* config the GPIO as analog mode */
    gpio_init(ADC_GPIO_PORT, GPIO_MODE_AIN, GPIO_OSPEED_MAX, ADC_GPIO_PIN);
}

void nvic_config(void)
{
    nvic_priority_group_set(NVIC_PRIGROUP_PRE2_SUB2);
    nvic_irq_enable(ADC0_1_IRQn, 0, 0);
}

void adc_config(void)
{
    /* ADC continuous function enable */
    adc_special_function_config(ADC1, ADC_CONTINUOUS_MODE, ENABLE);
    adc_special_function_config(ADC1, ADC_SCAN_MODE, DISABLE);
    /* ADC trigger config */
    adc_external_trigger_source_config(ADC1, ADC_ROUTINE_CHANNEL, ADC0_1_2_EXTTRIG_ROUTINE_NONE); 
    /* ADC data alignment config */
    adc_data_alignment_config(ADC1, ADC_DATAALIGN_RIGHT);
    /* ADC mode config */
    adc_mode_config(ADC_MODE_FREE); 
    /* ADC channel length config */
    adc_channel_length_config(ADC1, ADC_ROUTINE_CHANNEL, 1);

    /* ADC routine channel config */
    adc_routine_channel_config(ADC1, 0, BOARD_ADC_CHANNEL, ADC_SAMPLETIME_55POINT5);

    adc_external_trigger_config(ADC1, ADC_ROUTINE_CHANNEL, ENABLE);

    /* enable ADC interface */
    adc_enable(ADC1);
    delay_1ms(1);
    /* ADC calibration and reset calibration */
    adc_calibration_enable(ADC1);

    /* ADC analog watchdog threshold config */
    adc_watchdog_threshold_config(ADC1, ADC_WATCHDOG_LT, ADC_WATCHDOG_HT);
    /* ADC analog watchdog single channel config */
    adc_watchdog_single_channel_enable(ADC1, BOARD_ADC_CHANNEL);
    /* ADC interrupt config */
    adc_interrupt_enable(ADC1, ADC_INT_WDE);

    /* ADC software trigger enable */
    adc_software_trigger_enable(ADC1, ADC_ROUTINE_CHANNEL);
}