Commit 6286d2b1 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab

[media] doc-rst: add documentation for radiotrack

Convert it to ReST and add it to the media/v4l-drivers book.
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent f0bb8dd9
......@@ -32,4 +32,5 @@ License".
omap4_camera
pvrusb2
pxa_camera
radiotrack
zr364xx
NOTES ON RADIOTRACK CARD CONTROL
by Stephen M. Benoit (benoits@servicepro.com) Dec 14, 1996
----------------------------------------------------------------------------
The Radiotrack radio driver
===========================
Document version 1.0
Author: Stephen M. Benoit <benoits@servicepro.com>
Date: Dec 14, 1996
ACKNOWLEDGMENTS
----------------
This document was made based on 'C' code for Linux from Gideon le Grange
(legrang@active.co.za or legrang@cs.sun.ac.za) in 1994, and elaborations from
Frans Brinkman (brinkman@esd.nl) in 1996. The results reported here are from
......@@ -18,6 +20,7 @@ want to use the RadioTrack card in an environment other than MS Windows.
WHY THIS DOCUMENT?
------------------
I have a RadioTrack card from back when I ran an MS-Windows platform. After
converting to Linux, I found Gideon le Grange's command-line software for
running the card, and found that it was good! Frans Brinkman made a
......@@ -33,6 +36,7 @@ So, without further delay, here are the details.
PHYSICAL DESCRIPTION
--------------------
The RadioTrack card is an ISA 8-bit FM radio card. The radio frequency (RF)
input is simply an antenna lead, and the output is a power audio signal
available through a miniature phone plug. Its RF frequencies of operation are
......@@ -46,6 +50,7 @@ gets clipped beyond the limits mentioned above.
CONTROLLING THE CARD WITH IOPORT
--------------------------------
The RadioTrack (base) ioport is configurable for 0x30c or 0x20c. Only one
ioport seems to be involved. The ioport decoding circuitry must be pretty
simple, as individual ioport bits are directly matched to specific functions
......@@ -55,82 +60,98 @@ the ioports appears to be the "Stereo Detect" bit.
The bits of the ioport are arranged as follows:
MSb LSb
+------+------+------+--------+--------+-------+---------+--------+
| VolA | VolB | ???? | Stereo | Radio | TuneA | TuneB | Tune |
| (+) | (-) | | Detect | Audio | (bit) | (latch) | Update |
| | | | Enable | Enable | | | Enable |
+------+------+------+--------+--------+-------+---------+--------+
.. code-block:: none
VolA . VolB [AB......]
-----------
0 0 : audio mute
0 1 : volume + (some delay required)
1 0 : volume - (some delay required)
1 1 : stay at present volume
Stereo Detect Enable [...S....]
--------------------
0 : No Detect
1 : Detect
MSb LSb
+------+------+------+--------+--------+-------+---------+--------+
| VolA | VolB | ???? | Stereo | Radio | TuneA | TuneB | Tune |
| (+) | (-) | | Detect | Audio | (bit) | (latch) | Update |
| | | | Enable | Enable | | | Enable |
+------+------+------+--------+--------+-------+---------+--------+
==== ==== =================================
VolA VolB Description
==== ==== =================================
0 0 audio mute
0 1 volume + (some delay required)
1 0 volume - (some delay required)
1 1 stay at present volume
==== ==== =================================
==================== ===========
Stereo Detect Enable Description
==================== ===========
0 No Detect
1 Detect
==================== ===========
Results available by reading ioport >60 msec after last port write.
Results available by reading ioport >60 msec after last port write.
0xff ==> no stereo detected, 0xfd ==> stereo detected.
Radio to Audio (path) Enable [....R...]
----------------------------
0 : Disable path (silence)
1 : Enable path (audio produced)
============================= =============================
Radio to Audio (path) Enable Description
============================= =============================
0 Disable path (silence)
1 Enable path (audio produced)
============================= =============================
TuneA . TuneB [.....AB.]
-------------
0 0 : "zero" bit phase 1
0 1 : "zero" bit phase 2
===== ===== ==================
TuneA TuneB Description
===== ===== ==================
0 0 "zero" bit phase 1
0 1 "zero" bit phase 2
1 0 "one" bit phase 1
1 1 "one" bit phase 2
===== ===== ==================
1 0 : "one" bit phase 1
1 1 : "one" bit phase 2
24-bit code, where bits = (freq*40) + 10486188.
The Most Significant 11 bits must be 1010 xxxx 0x0 to be valid.
The bits are shifted in LSb first.
24-bit code, where bits = (freq*40) + 10486188.
The Most Significant 11 bits must be 1010 xxxx 0x0 to be valid.
The bits are shifted in LSb first.
Tune Update Enable [.......T]
------------------
0 : Tuner held constant
1 : Tuner updating in progress
================== ===========================
Tune Update Enable Description
================== ===========================
0 Tuner held constant
1 Tuner updating in progress
================== ===========================
PROGRAMMING EXAMPLES
--------------------
Default: BASE <-- 0xc8 (current volume, no stereo detect,
.. code-block:: none
Default: BASE <-- 0xc8 (current volume, no stereo detect,
radio enable, tuner adjust disable)
Card Off: BASE <-- 0x00 (audio mute, no stereo detect,
Card Off: BASE <-- 0x00 (audio mute, no stereo detect,
radio disable, tuner adjust disable)
Card On: BASE <-- 0x00 (see "Card Off", clears any unfinished business)
Card On: BASE <-- 0x00 (see "Card Off", clears any unfinished business)
BASE <-- 0xc8 (see "Default")
Volume Down: BASE <-- 0x48 (volume down, no stereo detect,
Volume Down: BASE <-- 0x48 (volume down, no stereo detect,
radio enable, tuner adjust disable)
* wait 10 msec *
wait 10 msec
BASE <-- 0xc8 (see "Default")
Volume Up: BASE <-- 0x88 (volume up, no stereo detect,
Volume Up: BASE <-- 0x88 (volume up, no stereo detect,
radio enable, tuner adjust disable)
* wait 10 msec *
wait 10 msec
BASE <-- 0xc8 (see "Default")
Check Stereo: BASE <-- 0xd8 (current volume, stereo detect,
Check Stereo: BASE <-- 0xd8 (current volume, stereo detect,
radio enable, tuner adjust disable)
* wait 100 msec *
wait 100 msec
x <-- BASE (read ioport)
BASE <-- 0xc8 (see "Default")
x=0xff ==> "not stereo", x=0xfd ==> "stereo detected"
Set Frequency: code = (freq*40) + 10486188
Set Frequency: code = (freq*40) + 10486188
foreach of the 24 bits in code,
(from Least to Most Significant):
to write a "zero" bit,
......@@ -143,5 +164,3 @@ Set Frequency: code = (freq*40) + 10486188
disable, "one" bit phase 1, tuner adjust)
BASE <-- 0x07 (audio mute, no stereo detect, radio
disable, "one" bit phase 2, tuner adjust)
----------------------------------------------------------------------------
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