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RE: General IO Port A?
GPIO A bit 0-3 is used for a button, the LED etc. Refer to the
developer board schematics
If you want to use GPIO you have three options:
1. Use the parallel port pins (GPIO port G). You can find an example in
2. Use the GPIO port A. The transceiver for COM 2 must be removed.
3. Use the GPIO port B. The transceiver for COM 1 must be removed.
>When i try to set the direction of the GPIO A using register
>R_PORT_PA_DIR, then bool failure.
>the program line : *R_PORT_PA_DIR = 0x00; //ALL PINS AS INPUT
>in the module_init.
The boot up may fail due to a collision on the GPIO port A (e.g.
you try to write to a button).
Behalf Of Eric Tang
Sent: Wednesday, June 05, 2002 7:34 AM
Subject: General IO Port A?
I try to use the GPIO Port A, but i have got some problems,
Can you all give me some directions?
First, I can't find where the GPIO A is located in the board.
It seems that the COM2 Female is using GPIO A (4,5,6,7), so
if i use the GPIO A, then i need to disable the COM2 Debug Port??
And where is the 0-3 pins?
When i try to set the direction of the GPIO A using register
R_PORT_PA_DIR, then bool failure.
the program line : *R_PORT_PA_DIR = 0x00; //ALL PINS AS INPUT
in the module_init.