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1 | NOTES ON RADIOTRACK CARD CONTROL |
2 | by Stephen M. Benoit (benoits@servicepro.com) Dec 14, 1996 |
3 | ---------------------------------------------------------------------------- |
4 | |
5 | Document version 1.0 |
6 | |
7 | ACKNOWLEDGMENTS |
8 | ---------------- |
9 | This document was made based on 'C' code for Linux from Gideon le Grange |
10 | (legrang@active.co.za or legrang@cs.sun.ac.za) in 1994, and elaborations from |
11 | Frans Brinkman (brinkman@esd.nl) in 1996. The results reported here are from |
12 | experiments that the author performed on his own setup, so your mileage may |
13 | vary... I make no guarantees, claims or warranties to the suitability or |
14 | validity of this information. No other documentation on the AIMS |
15 | Lab (http://www.aimslab.com/) RadioTrack card was made available to the |
16 | author. This document is offered in the hopes that it might help users who |
17 | want to use the RadioTrack card in an environment other than MS Windows. |
18 | |
19 | WHY THIS DOCUMENT? |
20 | ------------------ |
21 | I have a RadioTrack card from back when I ran an MS-Windows platform. After |
22 | converting to Linux, I found Gideon le Grange's command-line software for |
23 | running the card, and found that it was good! Frans Brinkman made a |
24 | comfortable X-windows interface, and added a scanning feature. For hack |
25 | value, I wanted to see if the tuner could be tuned beyond the usual FM radio |
26 | broadcast band, so I could pick up the audio carriers from North American |
27 | broadcast TV channels, situated just below and above the 87.0-109.0 MHz range. |
28 | I did not get much success, but I learned about programming ioports under |
29 | Linux and gained some insights about the hardware design used for the card. |
30 | |
31 | So, without further delay, here are the details. |
32 | |
33 | |
34 | PHYSICAL DESCRIPTION |
35 | -------------------- |
36 | The RadioTrack card is an ISA 8-bit FM radio card. The radio frequency (RF) |
37 | input is simply an antenna lead, and the output is a power audio signal |
38 | available through a miniature phone plug. Its RF frequencies of operation are |
39 | more or less limited from 87.0 to 109.0 MHz (the commercial FM broadcast |
40 | band). Although the registers can be programmed to request frequencies beyond |
41 | these limits, experiments did not give promising results. The variable |
42 | frequency oscillator (VFO) that demodulates the intermediate frequency (IF) |
43 | signal probably has a small range of useful frequencies, and wraps around or |
44 | gets clipped beyond the limits mentioned above. |
45 | |
46 | |
47 | CONTROLLING THE CARD WITH IOPORT |
48 | -------------------------------- |
49 | The RadioTrack (base) ioport is configurable for 0x30c or 0x20c. Only one |
50 | ioport seems to be involved. The ioport decoding circuitry must be pretty |
51 | simple, as individual ioport bits are directly matched to specific functions |
52 | (or blocks) of the radio card. This way, many functions can be changed in |
53 | parallel with one write to the ioport. The only feedback available through |
54 | the ioports appears to be the "Stereo Detect" bit. |
55 | |
56 | The bits of the ioport are arranged as follows: |
57 | |
58 | MSb LSb |
59 | +------+------+------+--------+--------+-------+---------+--------+ |
60 | | VolA | VolB | ???? | Stereo | Radio | TuneA | TuneB | Tune | |
61 | | (+) | (-) | | Detect | Audio | (bit) | (latch) | Update | |
62 | | | | | Enable | Enable | | | Enable | |
63 | +------+------+------+--------+--------+-------+---------+--------+ |
64 | |
65 | |
66 | VolA . VolB [AB......] |
67 | ----------- |
68 | 0 0 : audio mute |
69 | 0 1 : volume + (some delay required) |
70 | 1 0 : volume - (some delay required) |
71 | 1 1 : stay at present volume |
72 | |
73 | Stereo Detect Enable [...S....] |
74 | -------------------- |
75 | 0 : No Detect |
76 | 1 : Detect |
77 | |
78 | Results available by reading ioport >60 msec after last port write. |
79 | 0xff ==> no stereo detected, 0xfd ==> stereo detected. |
80 | |
81 | Radio to Audio (path) Enable [....R...] |
82 | ---------------------------- |
83 | 0 : Disable path (silence) |
84 | 1 : Enable path (audio produced) |
85 | |
86 | TuneA . TuneB [.....AB.] |
87 | ------------- |
88 | 0 0 : "zero" bit phase 1 |
89 | 0 1 : "zero" bit phase 2 |
90 | |
91 | 1 0 : "one" bit phase 1 |
92 | 1 1 : "one" bit phase 2 |
93 | |
94 | 24-bit code, where bits = (freq*40) + 10486188. |
95 | The Most Significant 11 bits must be 1010 xxxx 0x0 to be valid. |
96 | The bits are shifted in LSb first. |
97 | |
98 | Tune Update Enable [.......T] |
99 | ------------------ |
100 | 0 : Tuner held constant |
101 | 1 : Tuner updating in progress |
102 | |
103 | |
104 | PROGRAMMING EXAMPLES |
105 | -------------------- |
106 | Default: BASE <-- 0xc8 (current volume, no stereo detect, |
107 | radio enable, tuner adjust disable) |
108 | |
109 | Card Off: BASE <-- 0x00 (audio mute, no stereo detect, |
110 | radio disable, tuner adjust disable) |
111 | |
112 | Card On: BASE <-- 0x00 (see "Card Off", clears any unfinished business) |
113 | BASE <-- 0xc8 (see "Default") |
114 | |
115 | Volume Down: BASE <-- 0x48 (volume down, no stereo detect, |
116 | radio enable, tuner adjust disable) |
117 | * wait 10 msec * |
118 | BASE <-- 0xc8 (see "Default") |
119 | |
120 | Volume Up: BASE <-- 0x88 (volume up, no stereo detect, |
121 | radio enable, tuner adjust disable) |
122 | * wait 10 msec * |
123 | BASE <-- 0xc8 (see "Default") |
124 | |
125 | Check Stereo: BASE <-- 0xd8 (current volume, stereo detect, |
126 | radio enable, tuner adjust disable) |
127 | * wait 100 msec * |
128 | x <-- BASE (read ioport) |
129 | BASE <-- 0xc8 (see "Default") |
130 | |
131 | x=0xff ==> "not stereo", x=0xfd ==> "stereo detected" |
132 | |
133 | Set Frequency: code = (freq*40) + 10486188 |
134 | foreach of the 24 bits in code, |
135 | (from Least to Most Significant): |
136 | to write a "zero" bit, |
137 | BASE <-- 0x01 (audio mute, no stereo detect, radio |
138 | disable, "zero" bit phase 1, tuner adjust) |
139 | BASE <-- 0x03 (audio mute, no stereo detect, radio |
140 | disable, "zero" bit phase 2, tuner adjust) |
141 | to write a "one" bit, |
142 | BASE <-- 0x05 (audio mute, no stereo detect, radio |
143 | disable, "one" bit phase 1, tuner adjust) |
144 | BASE <-- 0x07 (audio mute, no stereo detect, radio |
145 | disable, "one" bit phase 2, tuner adjust) |
146 | |
147 | ---------------------------------------------------------------------------- |
148 |
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