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--- en:u3_shield_tinkering [2015/02/02 12:08]
john1117
+++ en:u3_shield_tinkering [2015/02/02 12:09] (current)
john1117
@@ Line 1: / Line 1: @@
+====== Use to U3 Shield Tinkering Kit ======
+This page introduces how you can use a Tinkering Kit compatible U3 IO Shield.
+{{:en:u3:u3io_tinkering.jpg?300|}}
+**Using a dual color LED and push button switch.**
+. Hardware settings.
+{{:en:u3:u3_tinkering_example1.png?300|}}
+. **ODROID-U3** settings.\\
+You will use GPIO-I2C to comunication with U3 IO Shield.
+  sudo modprobe i2c_dev
+  sudo modprobe i2c-gpio-custom bus0=4,200,199
+To use externel IO port of U3 IO Shield you will attach tca6416 gpio driver to i2c-gpio.4 bus.
+  echo tca6416 0x20 > /sys/devices/platform/i2c-gpio.4/i2c-4/new_device
+Now, you can use GPIO #301 ~ #304 in the Tinkering Kit.
+  echo 302 > /sys/class/gpio/export
+  echo out > /sys/class/gpio/gpio302/direction
+  echo 1 > /sys/class/gpio/gpio302/value
+. **Bash shell script example**
+<code bash>
+#!/bin/bash
+GPIOPATH="/sys/class/gpio"
+echo 301 > $GPIOPATH/unexport
+echo 302 > $GPIOPATH/unexport
+echo 303 > $GPIOPATH/unexport
+echo 301 > $GPIOPATH/export
+echo 302 > $GPIOPATH/export
+echo 303 > $GPIOPATH/export
+echo in > $GPIOPATH/gpio302/direction
+echo out > $GPIOPATH/gpio302/direction
+echo out > $GPIOPATH/gpio303/direction
+while true :
+do
+        cat=($(cat $GPIOPATH/gpio301/value))
+        if [ $cat -eq 0 ]; then
+                pushed=1
+        fi
+        if [[ ($cat -eq 1) && ($pushed -eq 1) ]]; then
+                pushed=0
+                cnt=$((($cnt + 1)%4))
+        fi
+        case $cnt in
+) echo 0 > $GPIOPATH/gpio302/value
+                   echo 0 > $GPIOPATH/gpio303/value ;;
+) echo 1 > $GPIOPATH/gpio302/value
+                   echo 0 > $GPIOPATH/gpio303/value ;;
+) echo 0 > $GPIOPATH/gpio302/value
+                   echo 1 > $GPIOPATH/gpio303/value ;;
+) echo 1 > $GPIOPATH/gpio302/value
+                   echo 1 > $GPIOPATH/gpio303/value ;;
+        esac
+        sleep 0.1
+done
+</code>