IDP/ARK-2151S/Test GPIO

PIN 0-5 DI
PIN 6-7 DO
PIN 8-9 GND

DI
i2cget -y 7 0x27 0x00
All off
0xff => 11111111
0: on
0x7f => 01111111
1: on
0xbf => 10111111

DO 0x06 => 110

i2cset -y 7 0x27 0x06 0x00

i2cset -y 7 0x27 0x06 0xff

DO LED Application

Test Script

#!/bin/bash
modprobe i2c-dev
echo "Blink LED on DO. Press [CTRL+C] to stop."
while :
do
   i2cset -y 7 0x27 0x06 0x00
   sleep 0.5
   i2cset -y 7 0x27 0x06 0xff
   sleep 0.5
done