path: root/Documentation/video4linux/hauppauge-wintv-cx88-ir.txt
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-The controls for the mux are GPIO [0,1] for source, and GPIO 2 for muting.
- 0 0 TV Audio
- 1 0 FM radio
- 0 1 Line-In
- 1 1 Mono tuner bypass or CD passthru (tuner specific)
-GPIO 16(i believe) is tied to the IR port (if present).
->From the data sheet:
- Register 24'h20004 PCI Interrupt Status
- bit [18] IR_SMP_INT Set when 32 input samples have been collected over
- gpio[16] pin into GP_SAMPLE register.
-What's missing from the data sheet:
-Setup 4KHz sampling rate (roughly 2x oversampled; good enough for our RC5
-compat remote)
-set register 0x35C050 to 0xa80a80
-enable sampling
-set register 0x35C054 to 0x5
-Of course, enable the IRQ bit 18 in the interrupt mask register .(and
-provide for a handler)
-GP_SAMPLE register is at 0x35C058
-Bits are then right shifted into the GP_SAMPLE register at the specified
-rate; you get an interrupt when a full DWORD is received.
-You need to recover the actual RC5 bits out of the (oversampled) IR sensor
-bits. (Hint: look for the 0/1and 1/0 crossings of the RC5 bi-phase data) An
-actual raw RC5 code will span 2-3 DWORDS, depending on the actual alignment.
-I'm pretty sure when no IR signal is present the receiver is always in a
-marking state(1); but stray light, etc can cause intermittent noise values
-as well. Remember, this is a free running sample of the IR receiver state
-over time, so don't assume any sample starts at any particular place.
-This data sheet (google search) seems to have a lovely description of the
-RC5 basics
- and more data
-and even a reference to how to decode a bi-phase data stream.
-still more info