在mbed环境下跑一下SAMD21：ADC

#include "PeripheralPins.h"



/************ADC***************/

const PinMap PinMap_ADC[] = {

    {PA02,  ADC_0, 1},

    {PA03,  ADC_1, 1},

    {PB08,  ADC_2, 1},

    {PB09,  ADC_3, 1},

    {PA04,  ADC_4, 1},

    {PA05,  ADC_5, 1},

    {PA06,  ADC_6, 1},

    {PA07,  ADC_7, 1},

    {PB00,  ADC_8, 1},

    {PB01,  ADC_9, 1},

    {PB02,  ADC_10, 1},

    {PB03,  ADC_11, 1},

    {PB04,  ADC_12, 1},

    {PB05,  ADC_13, 1},

    {PB06,  ADC_14, 1},

    {PB07,  ADC_15, 1},

    {PA08,  ADC_16, 1},

    {PA09,  ADC_17, 1},

    {PA10,  ADC_18, 1},

    {PA11,  ADC_19, 1},



    /* Not connected */

    {NC  , NC   , NC}

};



/************DAC***************/

const PinMap PinMap_DAC[] = {

    {PA02,  DAC_0, 1},



    /* Not connected */

    {NC  , NC   , NC}

};



/************SERCOM Pins***********/

const PinMap PinMap_SERCOM_PAD[] = {

    {PA00, SERCOM1_PAD0, 3},

    {PA01, SERCOM1_PAD1, 3},

    {PA04, SERCOM0_PAD0, 3},

    {PA05, SERCOM0_PAD1, 3},

    {PA06, SERCOM0_PAD2, 3},

    {PA07, SERCOM0_PAD3, 3},

    {PA08, SERCOM0_PAD0, 2},

    {PA09, SERCOM0_PAD1, 2},

    {PA10, SERCOM0_PAD2, 2},

    {PA11, SERCOM0_PAD3, 2},

    {PA12, SERCOM2_PAD0, 2},

    {PA13, SERCOM2_PAD1, 2},

    {PA14, SERCOM2_PAD2, 2},

    {PA15, SERCOM2_PAD3, 2},

    {PA16, SERCOM1_PAD0, 2},

    {PA17, SERCOM1_PAD1, 2},

    {PA18, SERCOM1_PAD2, 2},

    {PA19, SERCOM1_PAD3, 2},

    {PA20, SERCOM3_PAD2, 3},

    {PA21, SERCOM3_PAD3, 3},

    {PA22, SERCOM3_PAD0, 2},

    {PA23, SERCOM3_PAD1, 2},

    {PA24, SERCOM3_PAD2, 2},

    {PA25, SERCOM3_PAD3, 2},

    {PA30, SERCOM1_PAD2, 3},

    {PA31, SERCOM1_PAD3, 3},

    {PB00, SERCOM5_PAD2, 3},

    {PB01, SERCOM5_PAD3, 3},

    {PB02, SERCOM5_PAD0, 3},

    {PB03, SERCOM5_PAD1, 3},

    {PB08, SERCOM4_PAD0, 3},

    {PB09, SERCOM4_PAD1, 3},

    {PB10, SERCOM4_PAD2, 3},

    {PB11, SERCOM4_PAD3, 3},

    {PB12, SERCOM4_PAD0, 2},

    {PB13, SERCOM4_PAD1, 2},

    {PB14, SERCOM4_PAD2, 2},

    {PB15, SERCOM4_PAD3, 2},

    {PB16, SERCOM5_PAD0, 2},

    {PB17, SERCOM5_PAD1, 2},

    {PB22, SERCOM5_PAD2, 3},

    {PB23, SERCOM5_PAD3, 3},

    {PB30, SERCOM5_PAD0, 3},

    {PB31, SERCOM5_PAD1, 3},



    /* Not connected */

    {NC  , NC   , NC}

};



/*******SERCOM Pins extended*******/

const PinMap PinMap_SERCOM_PADEx[] = {

    {PA08, SERCOM2_PAD0, 3},

    {PA09, SERCOM2_PAD1, 3},

    {PA10, SERCOM2_PAD2, 3},

    {PA11, SERCOM2_PAD3, 3},

    {PA12, SERCOM4_PAD0, 3},

    {PA13, SERCOM4_PAD1, 3},

    {PA14, SERCOM4_PAD2, 3},

    {PA15, SERCOM4_PAD3, 3},

    {PA16, SERCOM3_PAD0, 3},

    {PA17, SERCOM3_PAD1, 3},

    {PA18, SERCOM3_PAD2, 3},

    {PA19, SERCOM3_PAD3, 3},

    {PA20, SERCOM5_PAD2, 2},

    {PA21, SERCOM5_PAD3, 2},

    {PA22, SERCOM5_PAD0, 3},

    {PA23, SERCOM5_PAD1, 3},

    {PA24, SERCOM5_PAD2, 3},

    {PA25, SERCOM5_PAD3, 3},



    /* Not connected */

    {NC  , NC   , NC}

};





/************PWM***************/

const PinMap PinMap_PWM[] = {

    {PA00, PWM_2, 4},

    {PA01, PWM_2, 4},

    {PA04, PWM_0, 4},

    {PA05, PWM_0, 4},

    {PA06, PWM_1, 4},

    {PA07, PWM_1, 4},

    {PA08, PWM_1, 5},

    {PA09, PWM_1, 5},

    {PA10, PWM_1, 4},

    {PA11, PWM_1, 4},

    {PA12, PWM_2, 4},

    {PA13, PWM_2, 4},

    {PA14, PWM_0, 5},

    {PA15, PWM_0, 5},

    {PA16, PWM_2, 4},

    {PA17, PWM_2, 4},

    {PA18, PWM_0, 5},

    {PA19, PWM_0, 5},

    {PA20, PWM_0, 5},

    {PA21, PWM_0, 5},

    {PA22, PWM_0, 5},

    {PA23, PWM_0, 5},

    {PA24, PWM_1, 5},

    {PA25, PWM_1, 5},

    {PA30, PWM_1, 4},

    {PA31, PWM_1, 4},

    {PB10, PWM_0, 5},

    {PB11, PWM_0, 5},

    {PB12, PWM_0, 5},

    {PB13, PWM_0, 5},

    {PB16, PWM_0, 5},

    {PB17, PWM_0, 5},

    {PB30, PWM_1, 5},

    {PB31, PWM_1, 5},



    /* Not connected */

    {NC  , NC   , NC}

};



/**********EXTINT*************/

const PinMap PinMap_EXTINT[] = {

    {PA16,  EXTINT_0, 0},

    {PB00,  EXTINT_0, 0},

    {PB16,  EXTINT_0, 0},

    {PA00,  EXTINT_0, 0},



    {PA17,  EXTINT_1, 0},

    {PB01,  EXTINT_1, 0},

    {PB17,  EXTINT_1, 0},

    {PA01,  EXTINT_1, 0},



    {PA18,  EXTINT_2, 0},

    {PA02,  EXTINT_2, 0},

    {PB02,  EXTINT_2, 0},



    {PA03,  EXTINT_3, 0},

    {PA19,  EXTINT_3, 0},

    {PB03,  EXTINT_3, 0},



    {PA04,  EXTINT_4, 0},

    {PA20,  EXTINT_4, 0},

    {PB04,  EXTINT_4, 0},



    {PA05,  EXTINT_5, 0},

    {PA21,  EXTINT_5, 0},

    {PB05,  EXTINT_5, 0},



    {PA06,  EXTINT_6, 0},

    {PA22,  EXTINT_6, 0},

    {PB06,  EXTINT_6, 0},

    {PB22,  EXTINT_6, 0},



    {PA07,  EXTINT_7, 0},

    {PA23,  EXTINT_7, 0},

    {PB07,  EXTINT_7, 0},

    {PB23,  EXTINT_7, 0},



    {PA28,  EXTINT_8, 0},

    {PB08,  EXTINT_8, 0},



    {PA09,  EXTINT_9, 0},

    {PB09,  EXTINT_9, 0},



    {PA10,  EXTINT_10, 0},

    {PA30,  EXTINT_10, 0},

    {PB10,  EXTINT_10, 0},



    {PA11,  EXTINT_11, 0},

    {PA31,  EXTINT_11, 0},

    {PB11,  EXTINT_11, 0},



    {PA12,  EXTINT_12, 0},

    {PA24,  EXTINT_12, 0},

    {PB12,  EXTINT_12, 0},



    {PA13,  EXTINT_13, 0},

    {PA25,  EXTINT_13, 0},

    {PB13,  EXTINT_13, 0},



    {PB14,  EXTINT_14, 0},

    {PB30,  EXTINT_14, 0},

    {PA14,  EXTINT_14, 0},



    {PA15,  EXTINT_15, 0},

    {PA27,  EXTINT_15, 0},

    {PB15,  EXTINT_15, 0},

    {PB31,  EXTINT_15, 0},



    /* Not connected */

    {NC  , NC   , NC}

};



const struct pwm_pin_channel pwn_pins[] = {

    {PA00, PWM_2, 0},

    {PA01, PWM_2, 1},

    {PA04, PWM_0, 0},

    {PA05, PWM_0, 1},

    {PA06, PWM_1, 0},

    {PA07, PWM_1, 1},

    {PA08, PWM_1, 2},

    {PA09, PWM_1, 3},

    {PA10, PWM_1, 0},

    {PA11, PWM_1, 1},

    {PA12, PWM_2, 0},

    {PA13, PWM_2, 1},

    {PA14, PWM_0, 4},

    {PA15, PWM_0, 5},

    {PA16, PWM_2, 0},

    {PA17, PWM_2, 1},

    {PA18, PWM_0, 2},

    {PA19, PWM_0, 3},

    {PA20, PWM_0, 6},

    {PA21, PWM_0, 7},

    {PA22, PWM_0, 4},

    {PA23, PWM_0, 5},

    {PA24, PWM_1, 2},

    {PA25, PWM_1, 3},

    {PA30, PWM_1, 0},

    {PA31, PWM_1, 1},

    {PB10, PWM_0, 4},

    {PB11, PWM_0, 5},

    {PB12, PWM_0, 6},

    {PB13, PWM_0, 7},

    {PB16, PWM_0, 4},

    {PB17, PWM_0, 5},

    {PB30, PWM_1, 2},

    {PB31, PWM_1, 3},



    /* Not connected */

    {NC  , NC   , NC}

};

#include "mbed.h"

 

// Initialize a pins to perform analog input and digital output fucntions

AnalogIn   ain(PA02);

DigitalOut dout(LED1);

 

int main(void)

{

    while (1) {

        // test the voltage on the initialized analog pin

        //  and if greater than 0.3 * VCC set the digital pin

        //  to a logic 1 otherwise a logic 0

        if(ain > 0.3f) {

            dout = 1;

        } else {

            dout = 0;

        }

        

        // print the percentage and 16 bit normalized values

        printf("percentage: %3.3f%%\n", ain.read()*100.0f);

        printf("normalized: 0x%04X \n", ain.read_u16());

        wait(0.2f);

    }

}