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→Préparer votre Arduino / RPi-ShieldBridge
Wire.write(0xAA); // send 0xAA
Wire.write(0xAA); // send 0xAA
}</nowiki>
}</nowiki>
== Préparé votre Pi ==
Activate I2C:
<nowiki>$ sudo modprobe i2c_bcm2708 baudrate=100000
$ sudo modprobe i2c-dev</nowiki>
Install i2c-tools and python-smbus:
<nowiki>$ sudo apt-get update
$ sudo apt-get install i2c-tools
$ sudo apt-get install python-smbus</nowiki>
Test I2C bus:
$ sudo i2cdetect -y 1
The Raspberry Pi hardware revision 1 boards connect I2C bus 0 (GPIO 0 + 1) and revision 2 boards connect I2C bus 1 (GPIO 2 + 3) to the GPIO connector.
Note: As default the reset pin of the Arduino is connected to GPIO18 (Pin 12) of the Raspberry Pi (GPIO18 high = reset on, GPIO18 low = reset off).
To disable the reset:
<nowiki>$ sudo -i
$ echo 18 > /sys/class/gpio/export
$ echo out > /sys/class/gpio/gpio18/direction
$ echo 0 > /sys/class/gpio/gpio18/value
$ exit</nowiki>
Or if you have installed WiringPi (voir [[Pi-WiringPi|notre tutoriel WiringPi]]):
<nowiki>gpio -g mode 18 out
gpio -g write 18 1</nowiki>
== Tester ==
=== Commande Shell ===
Switch on LED:
$ sudo i2cset -y 1 0x30 0x01
Switch off LED:
$ sudo i2cset -y 1 0x30 0x00
=== Python ===
Create a test script named i2ctest.py:
$ nano i2ctest.py
Et copiez y le code suivant:
<nowiki>#!/usr/bin/env python
# -*- coding: latin-1 -*-
import time
import smbus
bus = smbus.SMBus(1)
addr = 0x30
while True:
bus.write_byte(addr, 0x01)
print "on"
time.sleep(1)
bus.write_byte(addr, 0x00)
print "off"
time.sleep(1)</nowiki>
Run the script:
$ sudo python i2ctest.py
{{RPI-ShieldBridge-TRAILER}}
{{RPI-ShieldBridge-TRAILER}}