93 lines
3 KiB
C
93 lines
3 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2011 by Amaury Pouly
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#include "adc-imx233.h"
|
|
|
|
void adc_init(void)
|
|
{
|
|
}
|
|
|
|
static short adc_read_physical_ex(int virt)
|
|
{
|
|
imx233_lradc_clear_channel(virt);
|
|
imx233_lradc_kick_channel(virt);
|
|
imx233_lradc_wait_channel(virt);
|
|
return imx233_lradc_read_channel(virt);
|
|
}
|
|
|
|
static short adc_read_physical(int src, bool div2)
|
|
{
|
|
int virt = imx233_lradc_acquire_channel(TIMEOUT_BLOCK);
|
|
// divide by two for wider ranger
|
|
imx233_lradc_setup_channel(virt, div2, false, 0, src);
|
|
int val = adc_read_physical_ex(virt);
|
|
imx233_lradc_release_channel(virt);
|
|
return val;
|
|
}
|
|
|
|
static short adc_read_virtual(int c)
|
|
{
|
|
switch(c)
|
|
{
|
|
case IMX233_ADC_BATTERY:
|
|
return imx233_lradc_read_battery_voltage();
|
|
case IMX233_ADC_VDDIO:
|
|
/* VddIO pin has a builtin 2:1 divide */
|
|
return adc_read_physical(HW_LRADC_CHANNEL_VDDIO, false);
|
|
case IMX233_ADC_VDD5V:
|
|
/* Vdd5V pin has a builtin 4:1 divide */
|
|
return adc_read_physical(HW_LRADC_CHANNEL_5V, false) * 2;
|
|
case IMX233_ADC_DIE_TEMP:
|
|
{
|
|
// don't block on second channel otherwise we might deadlock !
|
|
int nmos_chan = imx233_lradc_acquire_channel(TIMEOUT_BLOCK);
|
|
int pmos_chan = imx233_lradc_acquire_channel(TIMEOUT_NOBLOCK);
|
|
int val = 0;
|
|
if(pmos_chan >= 0)
|
|
{
|
|
val = imx233_lradc_sense_die_temperature(nmos_chan, pmos_chan) - 273;
|
|
imx233_lradc_release_channel(pmos_chan);
|
|
}
|
|
imx233_lradc_release_channel(nmos_chan);
|
|
return val;
|
|
}
|
|
#ifdef IMX233_BATT_TEMP_SENSOR
|
|
case IMX233_ADC_BATT_TEMP:
|
|
{
|
|
int virt = imx233_lradc_acquire_channel(TIMEOUT_BLOCK);
|
|
int val = imx233_lradc_sense_ext_temperature(virt, IMX233_BATT_TEMP_SENSOR);
|
|
imx233_lradc_release_channel(virt);
|
|
return val;
|
|
}
|
|
#endif
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
unsigned short adc_read(int channel)
|
|
{
|
|
int c = imx233_adc_mapping[channel];
|
|
if(c < 0)
|
|
return adc_read_virtual(c);
|
|
else
|
|
return adc_read_physical(c, true);
|
|
}
|