139f9f28e9
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11392 a1c6a512-1295-4272-9138-f99709370657
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2006 by Linus Nielsen Feltzing
|
|
*
|
|
* All files in this archive are subject to the GNU General Public License.
|
|
* See the file COPYING in the source tree root for full license agreement.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
#include "config.h"
|
|
#include "cpu.h"
|
|
#include "system.h"
|
|
#include "kernel.h"
|
|
#include "thread.h"
|
|
#include "adc.h"
|
|
#include "pcf50606.h"
|
|
|
|
static unsigned char adcdata[NUM_ADC_CHANNELS];
|
|
|
|
static int adcc2_parms[] =
|
|
{
|
|
[ADC_BUTTONS] = 0x80 | (5 << 1) | 1, /* ADCIN2 */
|
|
[ADC_REMOTE] = 0x80 | (6 << 1) | 1, /* ADCIN3 */
|
|
[ADC_BATTERY] = 0x80 | (0 << 1) | 1, /* BATVOLT, resistive divider */
|
|
[ADC_REMOTEDETECT] = 0x80 | (2 << 1) | 1, /* ADCIN1, resistive divider */
|
|
};
|
|
|
|
unsigned short adc_scan(int channel)
|
|
{
|
|
int level = set_irq_level(HIGHEST_IRQ_LEVEL);
|
|
unsigned char data;
|
|
|
|
pcf50606_write(0x2f, adcc2_parms[channel]);
|
|
data = pcf50606_read(0x30);
|
|
|
|
adcdata[channel] = data;
|
|
|
|
set_irq_level(level);
|
|
return data;
|
|
}
|
|
|
|
|
|
unsigned short adc_read(int channel)
|
|
{
|
|
return adcdata[channel];
|
|
}
|
|
|
|
static int adc_counter;
|
|
|
|
static void adc_tick(void)
|
|
{
|
|
if(++adc_counter == HZ)
|
|
{
|
|
adc_counter = 0;
|
|
adc_scan(ADC_BATTERY);
|
|
adc_scan(ADC_REMOTEDETECT); /* Temporary. Remove when the remote
|
|
detection feels stable. */
|
|
}
|
|
}
|
|
|
|
void adc_init(void)
|
|
{
|
|
or_l(0x80600080, &GPIO_FUNCTION); /* GPIO7: CS
|
|
GPIO21: Data In (to the ADC)
|
|
GPIO22: CLK
|
|
GPIO31: Data Out (from the ADC) */
|
|
or_l(0x00600080, &GPIO_ENABLE);
|
|
or_l(0x80, &GPIO_OUT); /* CS high */
|
|
and_l(~0x00400000, &GPIO_OUT); /* CLK low */
|
|
|
|
adc_scan(ADC_BATTERY);
|
|
|
|
tick_add_task(adc_tick);
|
|
}
|