aio.h File Reference

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API Description

AIO is the anlog input & output interface to libmraa. It is used to read or set the voltage applied to an AIO pin.

#include "mraa/aio.h"

int main ()
{
    mraa_aio_context adc_a0;
    uint16_t adc_value = 0;

    adc_a0 = mraa_aio_init(0);
    if (adc_a0 == NULL) {
        return 1;
    }

    for(;;) {
        adc_value = mraa_aio_read(adc_a0);
        fprintf(stdout, "ADC A0 read %X - %d\n", adc_value, adc_value);
    }

    mraa_aio_close(adc_a0);

    return MRAA_SUCCESS;
}

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Functions
mraa_aio_context	mraa_aio_init (unsigned int pin)
uint16_t	mraa_aio_read (mraa_aio_context dev)
mraa_result_t	mraa_aio_close (mraa_aio_context dev)

Typedefs
typedef struct _aio *	mraa_aio_context

Function Documentation

mraa_aio_context mraa_aio_init

(

unsigned int

pin

)

Initialise an Analog input device, connected to the specified pin

Parameters

pin	Channel number to read ADC inputs

Returns

aio context or NULL

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uint16_t mraa_aio_read

(

mraa_aio_context

dev

)

Read the input voltage

Parameters

dev	The AIO context

Returns

The current input voltage, normalised to a 16-bit value

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mraa_result_t mraa_aio_close

(

mraa_aio_context

dev

)

Close the analog input context, this will free the memory for the context

Parameters

dev	The AIO context

Returns

Result of operation

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Typedef Documentation

typedef struct _aio* mraa_aio_context

Opaque pointer definition to the internal struct _aio. This context refers to one single AIO pin on the board.