1d4a9c6366
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11357 a1c6a512-1295-4272-9138-f99709370657
98 lines
2.4 KiB
C
Executable file
98 lines
2.4 KiB
C
Executable file
/***************************************************************************
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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) 2006 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 "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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#include "pcf50606.h"
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static unsigned short adcdata[NUM_ADC_CHANNELS];
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static const int adcc2_parms[] =
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{
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[ADC_BUTTONS] = 0x80 | (5 << 1) | 1, /* ADCIN2 */
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[ADC_REMOTE] = 0x80 | (6 << 1) | 1, /* ADCIN3 */
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[ADC_BATTERY] = 0x80 | (0 << 1) | 1, /* BATVOLT, resistive divider */
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};
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/* have buttons scan by default */
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static volatile bool button_scan_on = true;
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void adc_enable_button_scan(bool enable)
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{
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button_scan_on = enable;
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}
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bool adc_get_button_scan_enabled(void)
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{
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return button_scan_on;
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}
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unsigned short adc_scan(int channel)
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{
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int level;
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unsigned char data;
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if (channel == ADC_BUTTONS)
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{
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/* no button scan if nothing pushed */
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if (!button_scan_on)
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return adcdata[channel] = 0xff;
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}
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else if (channel == ADC_REMOTE)
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{
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/* no remote scan if not plugged */
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if (GPIO_READ & 0x01000000)
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return adcdata[channel] = 0xff;
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}
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level = set_irq_level(HIGHEST_IRQ_LEVEL);
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pcf50606_write(0x2f, adcc2_parms[channel]);
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data = pcf50606_read(0x30);
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adcdata[channel] = data;
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set_irq_level(level);
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return data;
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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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static int adc_counter;
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static void adc_tick(void)
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{
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if (++adc_counter == HZ)
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{
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adc_counter = 0;
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adc_scan(ADC_BATTERY);
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}
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}
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void adc_init(void)
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{
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adc_scan(ADC_BATTERY);
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tick_add_task(adc_tick);
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}
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