Commell FS-A74, User Manual

Page: 42 / 44

FS-A74 User’s Manual
-
41
-
Appendix D <Programming GPIO’s>
The GPIO’can be programmed with the MSDOS debug program using
simple IN/OUT commands.The following lines show an example how to
do this.
GPIO0…..GPIO7 bit0……bit7
-o 2 E 87 ;enter configuration
-o 2E 87
-o 2E 07
-o 2F 09 ;enale GPIO function
-o 2E 30
-o 2F 02 ;enable GPIO configuration
-o 2E F0
-o 2F xx ;set GPIO as input/output; set ‘1’ for input,’0’for
output
-o 2E F1
-o 2F xx ;if set GPIO’s as output,in this register its value can
be set
Optional :
-o 2E F2
-o 2F xx ; Data inversion register ; ‘1’ inverts the current valus
of the bits ,’0’ leaves them as they are
-o 2E 30
-o 2F 01 ; active GPIO’s
For further information, please refer to Winbond W83627DHG-P datasheet.