Omega Engineering OME-PIO-D96 manual Read/Write 8-bit data Register

3.3.8Read/Write 8-bit data Register

(Read/Write):wBase+0xc0/0xc4/0xc8/0xd0/0xd4/0xd8/

0xe0/0xe4/0xe8/0xf0/0xf4/0xf8/

Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
D7	D6	D5	D4	D3	D2	D1	D0

Note. Refer to Sec. 3.1 for more information about wBase.

There are twelve 8-bit I/O port in the OME-PIO-D96. Every I/O port can be programmed as D/I or D/O port. Refer to Sec. 3.3.8 for D/I or D/O selection. When the PC is power-up, all twelve ports are used as D/I port.

outportb(wBase+0xc0,Val);	/* write to Port0	*/
Val=inportb(wBase+0xc0);	/* read from Port0	*/
outportb(wBase+0xcc,0x07);	/* set port0~port2 as D/O ports	*/
outportb(wBase+0xc0,i1);	/* write to Port0	*/
outportb(wBase+0xc4,i2);	/* write to Port1	*/
outportb(wBase+0xc8,i3);	/* write to Port2	*/
outportb(wBase+0xec,0x04);	/* set Port6 & Port7 as D/I ports */
	/* set Port8 as D/O port	*/
j1=inportb(wBase+0xe0);	/* read Port6	*/
j2=inportb(wBase+0xe4);	/* read Port7	*/
outportb(wBase+0xe8,j3);	/* write to Port8	*/

NOTE: Make sure the I/O port configuration (DI or DO) before performing read/write to the data register. (Refer to sec. 3.3.7)

OME-PIO-D96 User Manual (Ver.1.1, Mar/2003) ---- 35