MSI MS-9A61, User Manual

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WDT & GPIO Touch Panel PC
A-3
WDT & GPIO Touch Panel PC
GPIO Sample Code

GPI 0 ~ GPI 3
GPI 0 GPI 1 GPI 2 GPI 3
IO Address 50Ch 50Ch 50Ch 50Ch
SIO GPIO Register
Bit 24 26 27 28
Sample code #1 #1 #1 #1

GPO 0 ~ GPO 3
GPO 0 GPO 1 GPO 2 GPO 3
IO Address 538h 538h 538h 538h
SIO GPIO Register
Bit 1 2 6 7
Sample code #2 #2 #2 #2
GPO_0 equ 00000010b
GPO_1 equ 00000100b
GPO_2 equ 01000000b
GPO_3 equ 10000000b
Sample Code:
#1 : Get GPI 0 status
; Get GPI 0/1/2/3 Pin Status Register
mov dx, 50Ch
in eax, dx
;eax bit24 = GPI 0 status
;eax bit26 = GPI 1 status
;eax bit27 = GPI 2 status
;eax bit28 = GPI 3 status
#2 : Set GPO 0/1/2/3 status to high
; Set GPO 0/1/2/3 Status to high(1).
mov dx, 538h
in eax, dx
or eax, GPO_0 + GPO_1 + GPO_2 + GPO_3
out dx,eax