User`s manual

ENDAT-D2550 USERS MANUAL

UNICORN COMPUTER CORP.

2-5. Digital I/O

J4 Pin define:

J4: Digital I/O Header (2x7 with 2.0mm)

Pin No. Function Pin No. Function

1 +5V 2 +5V

3 DIO-OUT0 4 DIO-IN0

5 DIO-OUT1 6 DIO-IN1

7 DIO GND 8 DIO GND

9 DIO-OUT2 10 DIO-IN2

11 DIO-OUT3 12 DIO-IN3

13 +3.3V 14 +3.3V

Digital I/O port address:

This function is support by onboard super I/O chip; it can be control easily by

change the register of super I/O chip via I/O port “2Eh” and “2Fh”. Please see

the sample code of below for implement. Voltage tolerance: +/- 5% with 0V to

+5V.

Sample code for input (using Turbo C/C++ 3.0):

bit No 7 6 5 4 3 2 1 0

Map

DIO-I3 DIO-I2 DIO-I1 DIO-I0 NA NA NA NA

Sample code for input (using Turbo C/C++ 3.0)

#define input_port 0x2f // Digital input data port

Unsigned char read_data;

outportb(0x2e,0x87); //Unlock register

outportb(0x2e,0x07); //set Logic Device number pointer

outportb(0x2f,0x08); //set Logic Device number

outportb(0x2e,0x30); //set Device Active

outportb(0x2f,0x02); // set Bit 1 =GPIO5 ; 0=Inactive / 1= Active Default: 03h

outportb(0x2e,0xE0); // set GPIO Output / Input Port

outportb(0x2f,0xF0); // 0=Output/ 1=Input ; Default: F0h

// Bit 0~3 DIO-O0~ DIO3 / Bit4~7 DIO-I0~DIO-I3.

outportb(0x2e,0xF1); //Read DIO-Input register.

//Bit4~Bit7 = DIO-I0~DIO-I3.(Read Only)

read_data=inportb(input_port); // Read digital input data

printf("DIO-Input=%02X\n",read_data); //Show digital input data on screen