Ttl I/O (Di-0/Di-1, Do-0/Do-1) Programming - FabiaTech Fanless Series User Manual

FabiaTech Corporation

TTL I/O (DI-0/DI-1, DO-0/DO-1) programming

The following is an Assembly program, which demonstrates how to set the GPIO
(DI-0/DI-1, DO-0/DO-1) type and how to read and write values.
;------------------------------------------------------------------------------------------
; Enter the extended function mode, interruptible double-write
;------------------------------------------------------------------------------------------
Mov dx, 2eh
Mov al, 87h
Out dx,al
Out dx,al
;------------------------------------------------------------------------------------------------------
; Configures logical device7, configuration register CRF0, CRF1, CRF2
; CRF0 (DI-0/DI-1, DO-0/DO-1 selection register.)
; When set to a "1", respective DI-0/DI-1port is programmed as input port.
; When set to a "0", respective DO-0/DO-1 port is programmed as an output port.
; CRF1 (DI-0/DI-1/DO-0/DO-1 data register.)
; If a port is programmed to be an output port, then its respective bit can be read
or written.
; If a port is programmed to be an input port, then its respective bit can only be
read.
; CRF2 (DI-0/DI-1, DO-0/DO-1 inversion register.)
; When set to a "1", the incoming/outgoing port value is inverted.
; When set to a "0", the incoming/outgoing port value is same as in data register.
;------------------------------------------------------------------------------------------------------
Mov dx,2eh
Mov al,07h
Out dx,al
Mov dx,2fh
Mov al,07h
Mov dx,al
Mov dx,2eh
Mov al,f0h
Out dx,al
Mov dx,2fh
Mov al,03h
Out dx,al
Mov dx,2eh
Mov al,f1h
Out dx,al
Mov dx,2fh
In al,dx
And al,03h
Mov ah,0ch
Or al,ah
Out dx,al
;------------------------------------------
; Enter to extended function mode
; point to Logical Device Number Reg.
; Select Logical Device 7
;Select CRF0
;Set DI-0/DI-1(Bit 0/1) is input and DO-0/DO-1(Bit 2/3) is output
;Update CRF0 with value 03h
;Select CRF1
;Read DI-0/DI-1 (Bit 0/1) Input value
;Write DO-0/DO-1 (Bit 2/3) Output value is "xxxx11xxb"
; update CRF1 with value
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