【CuriosityNano测试报告】+ ADC测量差值输入

#include <atmel_start.h>

#include <util/delay.h>

#include <stdio.h>

#include <avr/io.h>

#include <stdbool.h>

#include <string.h>



volatile uint8_t switchPressInterruptFlag;

volatile uint8_t pitInterruptFlag;



volatile int16_t adcVal;

static void PORT_init(void);

static void VREF0_init(void);

static void ADC0_init(void);

static void ADC0_start(void);

static bool ADC0_conversionDone(void);

static int16_t ADC0_read(void);

static void SYSTEM_init(void);





static void PORT_init(void)

{

    /* Disable interrupt and digital input buffer on PD3 */

    PORTD.PIN3CTRL &= ~PORT_ISC_gm;

    PORTD.PIN3CTRL |= PORT_ISC_INPUT_DISABLE_gc;

    /* Disable interrupt and digital input buffer on PD4 */

    PORTD.PIN4CTRL &= ~PORT_ISC_gm;

    PORTD.PIN4CTRL |= PORT_ISC_INPUT_DISABLE_gc;

    

    /* Disable pull-up resistor */

    PORTD.PIN3CTRL &= ~PORT_PULLUPEN_bm;

    PORTD.PIN4CTRL &= ~PORT_PULLUPEN_bm;

}



static void VREF0_init(void)

{

    VREF.ADC0REF = VREF_REFSEL_2V048_gc;  /* Internal 2.048V reference */

}



static void ADC0_init(void)

{

    ADC0.CTRLC = ADC_PRESC_DIV4_gc;       /* CLK_PER divided by 4 */

    ADC0.CTRLA = ADC_ENABLE_bm            /* ADC Enable: enabled */

               | ADC_RESSEL_12BIT_gc      /* 12-bit mode */

               | ADC_CONVMODE_bm          /* Differential Conversion */

               | ADC_FREERUN_bm;          /* Enable Free-Run mode */

    ADC0.MUXPOS = ADC_MUXPOS_AIN3_gc;     /* Select ADC channel AIN3 <-> PD3 */

    ADC0.MUXNEG = ADC_MUXNEG_AIN4_gc;     /* Select ADC channel AIN4 <-> PD4 */

}



static int16_t ADC0_read(void)

{

    /* Clear the interrupt flag by reading the result */

    return ADC0.RES;

}



static void ADC0_start(void)

{

    /* Start conversion */

    ADC0.COMMAND = ADC_STCONV_bm;

}



static bool ADC0_conversionDone(void)

{

    /* Check if the conversion is done  */

    return (ADC0.INTFLAGS & ADC_RESRDY_bm);

}



static void SYSTEM_init(void)

{

    PORT_init();

    VREF0_init();

    ADC0_init();

}





int main(void)

{

        /* Initializes MCU, drivers and middleware */

        atmel_start_init();

    SYSTEM_init();

    ADC0_start();

    

    

        while (1) {

        if(ADC0_conversionDone()){

         adcVal = ADC0_read();

         printf("%d \r\n",adcVal);

         _delay_ms(1000);

        }

        }

}