| /*************************************************************************** |
| * __________ __ ___. |
| * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| * \/ \/ \/ \/ \/ |
| * $Id$ |
| * |
| * Copyright (C) 2006 by Linus Nielsen Feltzing |
| * |
| * 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 "config.h" |
| #include "cpu.h" |
| #include "system.h" |
| #include "kernel.h" |
| #include "thread.h" |
| #include "adc.h" |
| #include "pcf50606.h" |
| |
| /* get remaining 2 bits and return 10 bit value */ |
| static int get_10bit_voltage(int msbdata) |
| { |
| int data = msbdata << 2; |
| data |= pcf50606_read(0x31) & 0x3; |
| return data; |
| } |
| |
| unsigned short adc_scan(int channel) |
| { |
| static const int adcc2_parms[] = |
| { |
| [ADC_BUTTONS] = 0x81 | (5 << 1), /* 8b - ADCIN2 */ |
| [ADC_REMOTE] = 0x81 | (6 << 1), /* 8b - ADCIN3 */ |
| [ADC_BATTERY] = 0x01 | (0 << 1), /* 10b - BATVOLT, resistive divider */ |
| }; |
| |
| int level; |
| int data; |
| |
| level = disable_irq_save(); |
| |
| pcf50606_write(0x2f, adcc2_parms[channel]); |
| data = pcf50606_read(0x30); |
| |
| if (channel == ADC_BATTERY) |
| data = get_10bit_voltage(data); |
| |
| restore_irq(level); |
| |
| return (unsigned short)data; |
| } |