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45 lines
1.7 KiB
Text
45 lines
1.7 KiB
Text
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The TRAB keyboard implementation is similar to that for LWMON and
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R360MPI boards. The only difference concerns key naming. There are 4
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keys on TRAB: 1, 2, 3, 4.
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1) The "kbd" command provides information about the current state of
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the keys. For example,
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TRAB # kbd
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Keys: 1 0 1 0
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means that keys 1 and 3 are pressed. The keyboard status is also
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stored in the "keybd" environment variable. In this example we get
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keybd=1010
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2) The "preboot" variable is set according to current environment
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settings and keys pressed. This is an example:
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TRAB # setenv magic_keys XY
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TRAB # setenv key_magicX 12
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TRAB # setenv key_cmdX echo ## Keys 1 + 2 pressed ##\;echo
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TRAB # setenv key_magicY 13
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TRAB # setenv key_cmdY echo ## Keys 1 + 3 pressed ##\;echo
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Here "magic_keys=XY" means that the "key_magicX" and "key_magicY"
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variables will be checked for a match. Each variable "key_magic*"
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defines a set of keys. In the our example, if keys 1 and 3 are
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pressed during reset, then "key_magicY" matches, so the "preboot"
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variable will be set to the contents of "key_cmdY":
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preboot=echo ## Keys 1 + 3 pressed ##;echo
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3) The TRAB board has optional modem support. When a certain key
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combination is pressed on the keyboard at power-on, the firmware
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performs the necessary initialization of the modem and allows for
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dial-in. The key combination is specified in the
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"include/configs/trab.h" file. For example:
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#define CONFIG_MODEM_KEY_MAGIC "23"
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means that modem will be initialized if and only if both keys 2, 3
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are pressed. Note that the format of this string is similar to the
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format of "key_magic*" environment variables described above.
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