Lecture 6

Uli Raich

UCC semester 2017/2018

Other RPI connections

• BPM180 barometric pressure sensor

Accessing the RPI remotely

Of course we can use the interfaces on the Raspberry Pi

to connect a screen, keyboard and mouse and use it in stand-alone mode

but we can also make use of the PC resources and access it remotely

There are several ways to access the RPI remotely:

• Using the VNC server on the Pi you can access it
  with a remote desktop from the PC
• The secure shell (ssh) allows you to get a remote terminal in the Pi
• With scp you can copy files back and forth between the Pi and the PC
• With nfs you can mount part of the Pi file system into the
  PC file system tree and access the PI SD card as if it was a local PC disk.

The remote Desktop

scp

To copy a file from the PC to the Pi this would be the command:

scp myfile.c uli@rpi-10:exercises/solutions/exercise_2

This will copy the file “myfile.c” into the sub-directory

exercises/solutions/exercise_2 on my home directory on the Pi.

Of course user uli must exist on raspberry10.

Instead of specifying the machine name: rpi-10

you can also give its IP address.

Compiling C programs for the Raspberry Pi

Just like Linux on the PC, Linux on the Raspberry Pi uses the GNU C compiler gcc.

The front end:

• Lexical Analyzer
• and the parser for the grammar

However, the code generator is different since now

we compile for the ARM processor and not the

Intel processor used on the PC

Cross-Compilation for the Pi

As explained in a previous lecture we can also compile

C programs for the Raspberry Pi on the

PC Linux system using a cross-compiler.

The cross compiler we will use is named

arm-linux-gnueabihf-gcc

and it is part of the tools package for the Pi.

It exists also as an Ubuntu package to be installed with apt.