fd1c1c80f4
* Intel Galileo Rev D: Added analog information * maa_check_aio, similar to maa_check_gpio, will setup multiplexers. * aio: Removed now duplicated functionality. Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>
75 lines
2.4 KiB
C
75 lines
2.4 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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/** @file
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*
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* This file defines the aio (analog in) interface for libmaa
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*
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*/
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#include <stdio.h>
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#include <fcntl.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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typedef struct {
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unsigned int channel;
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FILE *adc_in_fp;
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} maa_aio_context;
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/** Initialise an Analog input device, connected to the specified pin
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*
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* @param aio_channel channel number to read ADC inputs
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*
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* @returns pointer to maa_aio_context structure after initialisation of Analog
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* input pin successfully, else returns null.
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*/
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maa_aio_context* maa_aio_init(unsigned int aio_channel);
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/** Read the input voltage, represented as an unsigned short in the range [0x0,
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* 0xFFFF]
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*
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* @param dev - pointer to maa_aio_context structure initialised by
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* maa_aio_init()
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*
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* @returns 16-bit unsigned integer representing the current input voltage,
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* normalised to a 16-bit value
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*/
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unsigned int maa_aio_read_u16(maa_aio_context* dev);
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/** Close the analog input context
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* - Will free the memory for the context.
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*
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* @param dev - pointer to maa_aio_context structure initialised by
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* maa_aio_init()
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*
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* @return maa_result_t - result type.
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*/
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maa_result_t maa_aio_close(maa_aio_context* dev);
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