48 lines
1.5 KiB
C
48 lines
1.5 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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* $Id$
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*
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* Copyright (C) 2011 Marcin Bukat
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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 "config.h"
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#include "cpu.h"
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#include "system.h"
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#include "kernel.h"
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#include "thread.h"
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#include "adc.h"
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unsigned int adc_scan(int channel)
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{
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ADC_CTRL = (1<<4) | (1<<3) | (channel & (NUM_ADC_CHANNELS - 1));
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/* wait for conversion ready ~10us */
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while (ADC_STAT & 0x01);
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/* 10bits result */
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return (ADC_DATA & 0x3ff);
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}
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void adc_init(void)
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{
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/* ADC clock divider to reach max 1MHz */
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SCU_DIVCON1 = (SCU_DIVCON1 & ~(0xff<<10)) | (49<<10);
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/* enable clocks for ADC */
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SCU_CLKCFG |= 3<<23;
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}
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