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RASP-GPS-ULTIME-Uart (voir la source)
Version du 31 décembre 2016 à 15:07
, 31 décembre 2016 à 15:07→Etape 2: modifier /etc/inittab
Note vous devriez voir '''console=serial0,115200''' ou '''console=ttyS0,115200''' et retirer cet élément s'il est visible sur la ligne.
Note vous devriez voir '''console=serial0,115200''' ou '''console=ttyS0,115200''' et retirer cet élément s'il est visible sur la ligne.
== Etape 2: modifier /etc/inittab ==
== Etape 2 ==
=== Raspbian Wheezy uniquement ===
Nous allons modifier le script de démarrage présent dans {{fname|/etc/inittab}}
Saisissez la commande suivante dans une console/terminal:
Saisissez la commande suivante dans une console/terminal:
'''#Spawn a getty on Raspberry Pi serial line<br />#T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100'''
'''#Spawn a getty on Raspberry Pi serial line<br />#T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100'''
=== Raspbian Jessie (et suivant) ===
{{traduction}}
For the '''Raspberry Pi 1 or 2''' (but NOT the 3!) Run the following two commands to stop and disable the tty service:
<nowiki>sudo systemctl stop serial-getty@ttyAMA0.service
sudo systemctl disable serial-getty@ttyAMA0.service</nowiki>
However for the '''Raspberry Pi 3''' you need to use the '''/dev/ttyS0''' port since that is what is normally connected to the GPIO serial port pins. Use these two commands instead:
<nowiki>sudo systemctl stop serial-getty@ttyS0.service
sudo systemctl disable serial-getty@ttyS0.service</nowiki>
== Etape 3: Raspberry Pi 3 uniquement ==
{{traduction}}
'''For the Raspberry Pi 3''' you need to explicitly enable the serial port on the GPIO pins. The reason for this is a change with the Pi 3 to use the hardware serial port for Bluetooth and instead use a slightly different software serial port for the GPIO pins. A side effect of this change is that the serial port will actually change speed as the Pi CPU clock throttles up and down--this will unfortunately cause problems for most serial devices like GPS receivers!
Luckily there's an easy fix detailed in [http://spellfoundry.com/2016/05/29/configuring-gpio-serial-port-raspbian-jessie-including-pi-3 this excellet blog post] to force the Pi CPU into a fixed frequency which prevents speed changes on the serial port. The Pi might not perform as well but it will have a stable serial port speed.
To make this change edit the '''/boot/config.txt''' file by running:
sudo nano /boot/config.txt
At the very bottom of the file add this on a new line:
enable_uart=1
Save the file (press '''Ctrl-O''', then enter) and exit (press '''Ctrl-X'''). You're all set!
== Etape 3: Rebooter votre Pi ==
== Etape 3: Rebooter votre Pi ==