696b9d146b
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30534 a1c6a512-1295-4272-9138-f99709370657
94 lines
3 KiB
C
94 lines
3 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) 2011 by Amaury Pouly
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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 "adc.h"
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#include "adc-target.h"
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/* dedicate two channels to temperature sensing
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* dedicate channel 7 to battery
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* and channel 6 to vddio */
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static int pmos_chan, nmos_chan;
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static int battery_chan, vddio_chan;
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void adc_init(void)
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{
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imx233_lradc_init();
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battery_chan = 7;
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imx233_lradc_reserve_channel(7);
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vddio_chan = 6;
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imx233_lradc_reserve_channel(6);
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pmos_chan = imx233_lradc_acquire_channel(0);
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if(pmos_chan < 0) panicf("No LRADC channel for PMOS !");
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nmos_chan = imx233_lradc_acquire_channel(0);
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if(nmos_chan < 0) panicf("No LRADC channel for NMOS !");
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// setup them
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imx233_lradc_setup_channel(battery_chan, false, false, 0, HW_LRADC_CHANNEL_BATTERY);
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imx233_lradc_setup_channel(vddio_chan, false, false, 0, HW_LRADC_CHANNEL_VDDIO);
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imx233_lradc_setup_channel(nmos_chan, false, false, 0, HW_LRADC_CHANNEL_NMOS_THIN);
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imx233_lradc_setup_channel(pmos_chan, false, false, 0, HW_LRADC_CHANNEL_PMOS_THIN);
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}
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int adc_read_physical_ex(int virt)
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{
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imx233_lradc_clear_channel(virt);
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imx233_lradc_kick_channel(virt);
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imx233_lradc_wait_channel(virt);
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int v = imx233_lradc_read_channel(virt);
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return v;
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}
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int adc_read_physical(int src)
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{
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int virt = imx233_lradc_acquire_channel(TIMEOUT_BLOCK);
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// divide by two for wider ranger
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imx233_lradc_setup_channel(virt, false, false, 0, src);
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int val = adc_read_physical_ex(virt);
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imx233_lradc_release_channel(virt);
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return val;
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}
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unsigned short adc_read_virtual(int c)
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{
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switch(c)
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{
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case IMX233_ADC_BATTERY:
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return adc_read_physical_ex(battery_chan);
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case IMX233_ADC_VDDIO:
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return adc_read_physical_ex(vddio_chan);
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case IMX233_ADC_DIE_TEMP:
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// do kelvin to celsius conversion
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return imx233_lradc_sense_die_temperature(nmos_chan, pmos_chan) - 273;
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default:
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return 0;
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}
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}
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unsigned short adc_read(int channel)
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{
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int c = imx233_adc_mapping[channel];
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if(c < 0)
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return adc_read_virtual(c);
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else
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return adc_read_physical(c);
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}
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