83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/*
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* Author: Nandkishor Sonar
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* Copyright (c) 2014 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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/**
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* @file
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* @brief Analog input/output
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*
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* AIO is the anlog input & output interface to libmaa. It is used to read or
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* set the voltage applied to an AIO pin.
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*
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* @snippet analogin_a0.c Interesting
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include <stdint.h>
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#include "maa.h"
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#include "gpio.h"
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#define ADC_RAW_RESOLUTION_BITS (12)
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#define ADC_SUPPORTED_RESOLUTION_BITS (10)
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/**
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* Opaque pointer definition to the internal struct _aio. This context refers
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* to one single AIO pin on the board.
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*/
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typedef struct _aio* maa_aio_context;
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/**
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* Initialise an Analog input device, connected to the specified pin
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*
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* @param pin Channel number to read ADC inputs
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* @returns aio context or NULL
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*/
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maa_aio_context maa_aio_init(unsigned int pin);
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/**
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* Read the input voltage
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*
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* @param dev The AIO context
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* @returns The current input voltage, normalised to a 16-bit value
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*/
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uint16_t maa_aio_read(maa_aio_context dev);
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/**
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* Close the analog input context, this will free the memory for the context
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*
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* @param dev The AIO context
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* @return Result of operation
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*/
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maa_result_t maa_aio_close(maa_aio_context dev);
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#ifdef __cplusplus
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}
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#endif
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