f725641ff9
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1273 a1c6a512-1295-4272-9138-f99709370657
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/***************************************************************************
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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) 2002 by Linus Nielsen Feltzing
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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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 "sh7034.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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static int current_channel;
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static unsigned short adcdata[NUM_ADC_CHANNELS];
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static unsigned int adcreg[NUM_ADC_CHANNELS] =
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{
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ADDRAH_ADDR, ADDRBH_ADDR, ADDRCH_ADDR, ADDRDH_ADDR,
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ADDRAH_ADDR, ADDRBH_ADDR, ADDRCH_ADDR, ADDRDH_ADDR
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};
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static void adc_tick(void)
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{
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/* Read the data that has bee converted since the last tick */
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adcdata[current_channel] =
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*(unsigned short *)adcreg[current_channel] >> 6;
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/* Start a conversion on the next channel */
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current_channel++;
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if(current_channel == NUM_ADC_CHANNELS)
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current_channel = 0;
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ADCSR = ADCSR_ADST | current_channel;
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}
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unsigned short adc_read(int channel)
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{
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return adcdata[channel];
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}
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void adc_init(void)
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{
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ADCR = 0; /* No external trigger */
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current_channel = 0;
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tick_add_task(adc_tick);
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}
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