64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2016 by Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "adc.h"
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#include "adc-target.h"
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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static int adc_fd = -1; /* file descriptor */
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static const char *nwz_adc_channel_name[NWZ_ADC_MAX_CHAN + 1] =
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{
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[NWZ_ADC_VCCBAT] = "VCCBAT",
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[NWZ_ADC_VCCVBUS] = "VCCBUS",
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[NWZ_ADC_ADIN3] = "ADIN3",
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[NWZ_ADC_ADIN4] = "ADIN4",
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[NWZ_ADC_ADIN5] = "ADIN5",
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[NWZ_ADC_ADIN6] = "ADIN6",
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[NWZ_ADC_ADIN7] = "ADIN7",
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[NWZ_ADC_ADIN8] = "ADIN8"
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};
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void adc_init(void)
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{
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adc_fd = open(NWZ_ADC_DEV, O_RDONLY);
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}
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unsigned short adc_read(int channel)
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{
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unsigned char val;
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if(ioctl(adc_fd, NWZ_ADC_GET_VAL(channel), &val) < 0)
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return 0;
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else
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return val;
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}
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const char *adc_name(int channel)
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{
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if(channel < NWZ_ADC_MIN_CHAN || channel > NWZ_ADC_MAX_CHAN)
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return "";
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return nwz_adc_channel_name[channel];
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}
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