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This directory contains the device entries for the Consumer
IR Transmitter.


HARDWARE
   The consumer IR transmitter 38 KHz output is on the lowest
numbered pin on the connector (pin 2 or pin 10).  The next pin
(4 or 10) is driven high to indicate that an IR data packet
is being transmitted.  This pin normally is tied to an LED
through a 180 Ohm resistor.
   The remaining two pins on the connector are general purpose
I/O pins.


DEVICE NODES
   The device interfaces for the IR transmitter include the
input to the IR encoder as well as the direction and current
value of the GPIO pins.

.../irxmit
   This write-only node has the IR packet to send as string
of ones and zeros terminated by a newline.  A blank line
indicates that a REPEAT IR packet should be sent.

.../gpiodir
   The direction of the two GPIO pins as a single numeric
digit followed by a newline.  A value of 0 make both lines
an input and a value of 3 makes both lines an output.  A
value of 2 make the lower numbered GPIO pin (pin 6 or pin
14) an output and a value of 1 makes the higher numbers pin
(8 or 16) an output.

.../gpioval
   The value on the GPIO pins.  Write to this device node to
set an output and read from it to get the current value on
the pins.  A read requires a round trip over the USB-serial
link and may take a few milliseconds.  In time critical
applications you may want to use select() to wait for the
data.  The LSB of the return value is the value on the highest
numbered pin (pin 8 or pin 16).