6694212a6f
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5302 a1c6a512-1295-4272-9138-f99709370657
109 lines
3.3 KiB
C
109 lines
3.3 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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* Tuner "middleware" for Samsung S1A0903X01 chip
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*
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* Copyright (C) 2003 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 <stdbool.h>
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#include "tuner.h" /* tuner abstraction interface */
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#include "fmradio.h" /* physical interface driver */
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#define DEFAULT_IN1 0x100003 /* Mute */
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#define DEFAULT_IN2 0x140884 /* 5kHz, 7.2MHz crystal */
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#define PLL_FREQ_STEP 10000
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int debug_fm_detection;
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static int fm_in1;
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static int fm_in2;
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/* tuner abstraction layer: set something to the tuner */
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void samsung_set(int setting, int value)
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{
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switch(setting)
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{
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case RADIO_INIT:
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fm_in1 = DEFAULT_IN1;
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fm_in2 = DEFAULT_IN2;
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fmradio_set(1, fm_in1);
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fmradio_set(2, fm_in2);
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break;
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case RADIO_FREQUENCY:
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{
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int pll_cnt;
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/* We add the standard Intermediate Frequency 10.7MHz
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** before calculating the divisor
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** The reference frequency is set to 50kHz, and the VCO
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** output is prescaled by 2.
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*/
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pll_cnt = (value + 10700000) / (PLL_FREQ_STEP/2) / 2;
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/* 0x100000 == FM mode
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** 0x000002 == Microprocessor controlled Mute
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*/
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fm_in1 = (fm_in1 & 0xfff00007) | (pll_cnt << 3);
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fmradio_set(1, fm_in1);
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break;
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}
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case RADIO_MUTE:
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fm_in1 = (fm_in1 & 0xfffffffe) | (value?1:0);
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fmradio_set(1, fm_in1);
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break;
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case RADIO_IF_MEASUREMENT:
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fm_in1 = (fm_in1 & 0xfffffffb) | (value?4:0);
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fmradio_set(1, fm_in1);
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break;
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case RADIO_SENSITIVITY:
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fm_in2 = (fm_in2 & 0xffff9fff) | ((value & 3) << 13);
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fmradio_set(2, fm_in2);
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break;
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case RADIO_FORCE_MONO:
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fm_in2 = (fm_in2 & 0xfffffffb) | (value?0:4);
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fmradio_set(2, fm_in2);
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break;
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}
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}
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/* tuner abstraction layer: read something from the tuner */
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int samsung_get(int setting)
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{
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int val = -1;
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switch(setting)
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{
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case RADIO_PRESENT:
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fmradio_set(2, 0x140885); /* 5kHz, 7.2MHz crystal, test mode 1 */
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val = fmradio_read(0);
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debug_fm_detection = val;
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val = (val == 0x140885);
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break;
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case RADIO_DEVIATION:
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val = fmradio_read(3);
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val = 10700 - ((val & 0x7ffff) / 8); /* convert to kHz */
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break;
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case RADIO_STEREO:
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val = fmradio_read(3);
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val = ((val & 0x100000) ? true : false);
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}
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return val;
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}
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