Advantech MIC-770 V2 User Manual page 109

B.1.2 GPIO Example Program
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Enter the extended function mode, interruptible double-write
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MOV DX, 2EH
MOV AL, 87H
OUT DX, AL
OUT DX, AL
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Configure logical device 7(GP10~GP17), configuration register CRE4,CRE5,CRE6
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MOV DX, 2EH
MOV AL, 07H ; Point to Logical Device Number Reg.
OUT DX, AL
MOV DX, 2FH
MOV AL, 07H ; Select logical device 7
OUT DX, AL
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Configure GPIO1 I/O Register
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MOV DX, 2EH
MOV AL, ECH
OUT DX, AL
MOV DX, 2FH
MOV AL, ??H ; 0: The respective GPIO1 PIN is programmed as an output port
;1: The respective GPIO1 PIN is programmed as an input port.
OUT DX, AL
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Configure GPIO1 Inversion Register
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MOV DX, 2EH
MOV AL, EEH
OUT DX, AL
MOV DX, 2FH
MOV AL, 00H ; Set GPIO is normal not inverter
OUT DX, AL
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Configure GPIO1 Data Register
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MOV DX, 2EH
MOV AL, EDH
OUT DX, AL
MOV DX, 2FH
MOV AL, ??H ; Put the output value into AL
OUT DX, AL
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Exit extended function mode |
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MOV DX, 2EH
MOV AL, AAH
OUT DX, AL
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