Aaeon BOXER-6914, Руководство пользователя

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E m b e d d e d B o x P C
B O X E R - 6 9 1 4
only supported 39 GPIO function and the pin 4 won’t be used for
GPIO function. If user wants to access internal register by SMBus
interface, the pin 48, 1, 2, 3 must be set internal pull-
high with 10KΩ.
When user don’t use the pin 4 (GPIO function), the pin will must be
set internal pull-high. In SPI interface, the pin 2, 3 must be set
internal pull-
high with 10KΩ. Also, the pin 4 will be selectively set
internal pull-
high with 10KΩ by user.
3. Register Description
When users access internal registers by LPC interface, the
configuration register will be used to control the behavior of the
corresponding devices. To configure the register, using the index
port to select the index and then writing data port to alter the
parameters. The default index port and data port are 2Eh and 2Fh
respectively. Write data 10h in index 27h of global control register to
change the default value to 4Eh/4Fh. To enable configuration, the
entry key 50h must be written to the index port. To disable
configuration, write exit key AAh to the index port. Following is an
example to enable configuration and disable configuration by using
debug.
-o 2e 50
-o 2e 50 (enable configuration)
-o 2e aa (disable configuration)
The Following is a register map (total devices) grouped in
hexadecimal address order, which shows a summary of all registers
Appendix C Programming the Digital I/Os
C-3