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authorMauro Carvalho Chehab <mchehab@infradead.org>2006-05-22 09:31:37 -0400
committerMauro Carvalho Chehab <mchehab@infradead.org>2006-06-25 00:59:48 -0400
commit447d6fb8ccdc3a581a13fe4b5a62c384dc9fd36a (patch)
tree24163c66d1d1f27241c2a5c640175f3f7f42ce31 /Documentation/video4linux/cx88/hauppauge-wintv-cx88-ir.txt
parentb8d4c235d50f8512bbc9d67730c24da3309b0307 (diff)
V4L/DVB (3809b): Added missing docs at kernel tree
Date: From: Mauro Carvalho Chehab <mchehab@infradead.org> There are some docs at V4L/DVB tree that were never included at kernel. This patch includes those docs. Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'Documentation/video4linux/cx88/hauppauge-wintv-cx88-ir.txt')
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diff --git a/Documentation/video4linux/cx88/hauppauge-wintv-cx88-ir.txt b/Documentation/video4linux/cx88/hauppauge-wintv-cx88-ir.txt
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index 000000000000..93fec32a1188
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1The controls for the mux are GPIO [0,1] for source, and GPIO 2 for muting.
2
3GPIO0 GPIO1
4 0 0 TV Audio
5 1 0 FM radio
6 0 1 Line-In
7 1 1 Mono tuner bypass or CD passthru (tuner specific)
8
9GPIO 16(i believe) is tied to the IR port (if present).
10
11------------------------------------------------------------------------------------
12
13>From the data sheet:
14 Register 24'h20004 PCI Interrupt Status
15 bit [18] IR_SMP_INT Set when 32 input samples have been collected over
16 gpio[16] pin into GP_SAMPLE register.
17
18What's missing from the data sheet:
19
20Setup 4KHz sampling rate (roughly 2x oversampled; good enough for our RC5
21compat remote)
22set register 0x35C050 to 0xa80a80
23
24enable sampling
25set register 0x35C054 to 0x5
26
27Of course, enable the IRQ bit 18 in the interrupt mask register .(and
28provide for a handler)
29
30GP_SAMPLE register is at 0x35C058
31
32Bits are then right shifted into the GP_SAMPLE register at the specified
33rate; you get an interrupt when a full DWORD is recieved.
34You need to recover the actual RC5 bits out of the (oversampled) IR sensor
35bits. (Hint: look for the 0/1and 1/0 crossings of the RC5 bi-phase data) An
36actual raw RC5 code will span 2-3 DWORDS, depending on the actual alignment.
37
38I'm pretty sure when no IR signal is present the receiver is always in a
39marking state(1); but stray light, etc can cause intermittent noise values
40as well. Remember, this is a free running sample of the IR receiver state
41over time, so don't assume any sample starts at any particular place.
42
43http://www.atmel.com/dyn/resources/prod_documents/doc2817.pdf
44This data sheet (google search) seems to have a lovely description of the
45RC5 basics
46
47http://users.pandora.be/nenya/electronics/rc5/ and more data
48
49http://www.ee.washington.edu/circuit_archive/text/ir_decode.txt
50and even a reference to how to decode a bi-phase data stream.
51
52http://www.xs4all.nl/~sbp/knowledge/ir/rc5.htm
53still more info
54