Acnodes FPC 7619 - Manual (Page 54)

FPC 7619
19 inch Atom Fanless Panel PC
© Copyright 2012 Acnodes, Inc.
All rights reserved. Product description and product specifications
are subject to change without notice. For latest product information,
please visit Acnodes’ web site at www.acnodes.com. 14628 Central Ave,
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tel:909.597.7588, fax:909.597.1939
outportb(0 x4E, 0x30); //Logic device ac tivation contro l
outportb(0 x4F, (inportb(0x4F)|0x4));
//S et bit[2] to enable GP IO Por t6 if LDN= 8
Configure GPIO register
E xample x86 as sembly code:
m ov dx, 4Eh
m ov al, 0E 6h ;GP IO inversion reg.
out dx , al
m ov dx, 4Fh
m ov al, 000h ;0 – norm al, 1 - inverted
out dx , al
m ov dx, 4Eh
m ov al, 0E 4h ;GP IO I/O selec tion reg.
out dx , al
m ov dx, 4Fh
m ov al, 0FFh ;0 – Output, 1 – Input
;or m ov al, 0F0h to s et ou tput
out dx , al
E xample C c ode:
outportb(0 x4E, 0xE 6); //GP IO I/O selec tion reg.
outportb(0 x4F, 0x0); //0 – nor mal, 1 – inv erted
outportb(0 x4E, 0xE4); //GP IO inversion reg.
outportb(0 x4F, 0xFF); //0 – Output, 1 - Input
or
outportb(0 x4E, 0xE 4); //GP IO invers ion reg.
outportb(0 x4F, 0xF0); //0 – Output, 1 – Input
Read GPIO value
E xample x86 as sembly code:
m ov dx, 4Eh
m ov al, 0E 5h ;GP IO data reg.
out dx , al
m ov dx, 4Fh
in al, dx ;Bit[3::0] = GPI[3::0] value
E xample C c ode:
outportb(0 x4E, 0xE 5); //GP IO data reg.