MSI MS-98I0 - Appendix: GPIO Sample Code

A-3
WDT & GPIO MS-98I0
GPIO Sample Code
 GPI 0 ~ GPI 3
GPI 0 GPI 1 GPI 2 GPI 3
Memory Address 0FED8C428h
0FED8C420h
0FED8C440h
0FED8C410h
SIO IO Register
Bit 0 0 0 0
Sample code #1
 GPO 0 ~ GPO 3
GPO 0 GPO 1 GPO 2 GPO 3
Memory Address 0FED8C400h
0FED8C418h
0FED8C438h
0FED8C408h
SIO PIO Register
Bit 1 1 1 1
Sample code #2
GPI0_Addr equ 0FED8C428h
GPO0_Addr equ 0FED8C400h
Sample Code:
#1: Get GPI 0 status
Push es
Push 0
Pop es
Push esi
; Get GPI 0 Pin Status Register
mov esi, GPI0_Addr
mov al, byte ptr es:[esi]
;al bit0 = GPI 0 status
Pop esi
Pop es
#2: Set GPO 0 value to high
Push es
Push 0
Pop es
Push esi
; Get GPO 0 Pin Status Register
mov esi, GPO0_Addr
mov al, byte ptr es:[esi]
or al, 02h
mov byte ptr es:[esi],al
Pop esi
Pop es