Aio Class Reference

Detailed Description

This file defines the aio interface for libmraa

    /* initialize AIO */
    mraa::Aio aio(AIO_PORT);

    while (flag) {
        value = aio.read();
        float_value = aio.readFloat();
        std::cout << "ADC A0 read %X - %d" << value << value << std::endl;
        std::cout << "ADC A0 read float - %.5f" << float_value << std::endl;
    }

Public Member Functions
	Aio (int pin)
	Aio (void *aio_context)
	~Aio ()
unsigned int	read ()
float	readFloat ()
Result	setBit (int bits)
int	getBit ()

Constructor & Destructor Documentation

Aio ( int  pin )

inline

Aio Constructor, takes a pin number which will map directly to the board number

Parameters

pin	channel number to read ADC inputs

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Aio ( void *  aio_context )

inline

Aio Constructor, takes a pointer to the AIO context and initialises the AIO class. Aio pins are always 0 indexed reguardless of their position. Check your board mapping for details. An arduino style layout will have A0 as pin14 but AIO0.

Parameters

aio_context

void * to an AIO context

~Aio ( )

inline

Aio destructor

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Member Function Documentation

unsigned int read ( )

inline

Read a value from the AIO pin. By default mraa will shift the raw value up or down to a 10 bit value.

Exceptions

std::invalid_argument

in case of error

Returns

The current input voltage. By default, a 10bit value

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float readFloat ( )

inline

Read a value from the AIO pin and return it as a normalized float.

Exceptions

std::invalid_argument

in case of error

Returns

The current input voltage as a normalized float (0.0f-1.0f)

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Result setBit ( int  bits )

inline

Set the bit value which mraa will shift the raw reading from the ADC to. I.e. 10bits

Parameters

bits	the bits the return from read should be i.e 10

Returns

mraa::Result type

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int getBit ( )

inline

Gets the bit value mraa is shifting the analog read to.

Returns

bit value mraa is set return from the read function

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The documentation for this class was generated from the following file:

• api/mraa/aio.hpp