207c54a5e7
Signed-off-by: Nandkishor Sonar <nandkishor.sonar@intel.com> Reviewed-by: Brendan Le Foll <brendan.le.foll@intel.com>
83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
/*
|
|
* Author: Nandkishor Sonar
|
|
* Copyright (c) 2014 Intel Corporation.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <stdio.h>
|
|
#include <fcntl.h>
|
|
|
|
#include "maa.h"
|
|
#include "gpio.h"
|
|
|
|
#define TOTAL_ANALOG_INPUTS_ON_BOARD (6)
|
|
|
|
static const unsigned int A0 = 0;
|
|
static const unsigned int A1 = 1;
|
|
static const unsigned int A2 = 2;
|
|
static const unsigned int A3 = 3;
|
|
static const unsigned int A4 = 4;
|
|
static const unsigned int A5 = 5;
|
|
|
|
#define ADC_RAW_RESOLUTION_BITS (12)
|
|
#define ADC_SUPPORTED_RESOLUTION_BITS (10)
|
|
#define ADC_COMMON_GATE_A4_A5 (29)
|
|
|
|
static const unsigned int
|
|
adc_gate_pins[TOTAL_ANALOG_INPUTS_ON_BOARD] = {37, 36, 23, 22, 21, 20};
|
|
|
|
typedef struct {
|
|
unsigned int channel;
|
|
FILE *adc_in_fp;
|
|
} maa_aio_context;
|
|
|
|
/** Initialise an Analog input device, connected to the specified pin
|
|
*
|
|
* @param aio_channel channel number to read ADC inputs
|
|
*
|
|
* @returns pointer to maa_aio_context structure after initialisation of Analog
|
|
* input pin successfully, else returns null.
|
|
*/
|
|
maa_aio_context* maa_aio_init(unsigned int aio_channel);
|
|
|
|
/** Read the input voltage, represented as an unsigned short in the range [0x0,
|
|
* 0xFFFF]
|
|
*
|
|
* @param dev - pointer to maa_aio_context structure initialised by
|
|
* maa_aio_init()
|
|
*
|
|
* @returns 16-bit unsigned integer representing the current input voltage,
|
|
* normalised to a 16-bit value
|
|
*/
|
|
unsigned int maa_aio_read_u16(maa_aio_context* dev);
|
|
|
|
/** Close the analog input context
|
|
* - Will free the memory for the context.
|
|
*
|
|
* @param dev - pointer to maa_aio_context structure initialised by
|
|
* maa_aio_init()
|
|
*
|
|
* @return maa_result_t - result type.
|
|
*/
|
|
maa_result_t maa_aio_close(maa_aio_context* dev);
|