Raspberry Pi configuration

Install raspian

Disable searial console as described in [1]:

For: Raspian Wheezy (see http://www.raspberry-projects.com/pi/pi-operating-systems/raspbian/io-pins-raspbian/uart-pins):
* remove console=ttyAMA0,115200 from commadline in /boot/commandline.txt
* comment out line with ttyAMA0 in /etc/inittab

For: Raspian Jessie (see https://www.raspberrypi.org/forums/viewtopic.php?f=44&t=153063):
* disable "serial console" through "sudo raspi-config" (under Advanced Settings). Reboot the pi.
* "sudo nano /boot/config.txt", and change "enable_uart=0" to "enable_uart=1 (at the bottom of the file):
* disable the ModemMonitor service: "sudo systemctl disable ModemManager.service"
* Add user to the dialout group: "sudo adduser pi dialout".  Note: replace pi with the correct user name.

[1] http://www.raspberry-projects.com/pi/pi-operating-systems/raspbian/io-pins-raspbian/uart-pins

Set serial line speed
=====================

* set line speed
stty -F /dev/ttyAMA0 9600

* check line speed (make sure it reads 9600)
stty -F /dev/ttyAMA0


Test serial communication with cu
=================================

* Install terminal program (cu), if not already installed with:
aptitude install cu

* connect with cu  ( exit with ~. on a new line )
cu -l /dev/ttyAMA0

eWeb commands
=============
LcPnnn          Activate Lob at channel c with power nnn
TcPnnnFmmmWiii  Activate Tadel at channel c with power nnn frequency mmm Waveform iii
tcPnnnFmmmWiii  Activate Tadel with sensitiv mode
A               Read current state of the analog inputs
S               Read current state of the digital inputs

Notes:
* Numbers start with 0 e.g. the first channel is 0, the first waveform is 0
* Each command starts at the begining of a line.
* The command will be executed once a CR (0x13) has been received.
* The receiver turns off automatically if the command is not repeated within 5 seconds.
* An empty line repeats the last command
* Use 8 bit values (0..255) for power and frequency
Examples:

L0              Lob channel 0 off
L0P0            Lob channel 0 off
L1P000          Lob channel 1 off
L1P128          Lob channel 1 50%
T               Tadel channel 0 off
T0P0            Tadel channel 0 off
T1P20F100W0     Tadel channel 1 power 20 frequency 100 waveform 0
T1F100P20       Tadel channel 1 power 20 frequency 100 waveform 0
T2P20           Tadel channel 2 power 20 frequency 0 waveform 0