Tag Archives: Raspberry Pi

Raspberry Pi B+ Review

Below is a review I wrote for the Geelong Radio and Electronics Society (VK3ANR) on the Raspberry Pi model B+ that was released earlier this year.

 

2 years ago, the Raspberry Pi foundation, launched the original Raspberry Pi Model B, a 700MHz ARM processor with 256MB of ram, USB, ethernet, HDMI and a whole host of other I/O and pins for good measure all in the area of a credit card. Since there have been three other Raspberry Pi’s released: the cut-down model A, aimed at schools; the model B - version 2 which brought out more of the GPIO that was previously inaccessible and doubled the amount of RAM to 512MB, and the compute module for embedding in devices.

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2.2" ILI9340C TFT and the Raspberry Pi

Introduction

This page describes how I went about connecting a small 2.2" TFT display to the Raspberry Pi. This page is mainly for reference about what chip is in the display and what modules are required to make it work.

X server running on the 2.2" TFT in portrait mode.
X server running on the 2.2" TFT in portrait mode.

The hardware

The display is I purchases is a 2.2" Colour TFT with a resolution of 320x240. It is controlled with the ILI9340C LCD driver chip via the SPI bus and runs on 3.3v.  They can be found on eBay for a ~$6 AUD.

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Raspberry Pi

I recently received my Raspberry PI from RS a few weeks ago. Here I plan to document the oddities and things I learn. If only such that I can look them up when I forget.

I can wholly recommend the case sold by these guys it  fits perfectly.

If you plan to have your root FS on a USB harddrive, you need to upgrade the firmware, either using the tool by hexxeh using his awesome util found (https://github.com/Hexxeh/rpi-update) or by manually pulling the latest from https://github.com/raspberrypi/firmware

 

If you want to play audio from mplayer, it's broken. Well very buggy there's currently an open issue https://github.com/raspberrypi/firmware/issues/2 addressing it in which anumber of things are suggested. Although it can be bodged round using "mplayer -ao sdl" to play viasdl which some reason gets round (from my understanding) the buffer underrun in the alsa module. - This was fixed! 😛

 

A good powersupply is vital, otherwise you can expect all of the issues mentioned over at: http://elinux.org/R-Pi_Troubleshooting#Troubleshooting_power_problems

Pointless Things Discovered:

LAMMPS (http://lammps.sandia.gov/) can be run on the PI, it is however very slow. Using stock debian-arm and lammps built with gcc -mfloat-abi=softfp. I managed to achieve 100ps NPT in 89 hours for alanine with 1728TIP3P water molecules. This could be improved if I moved to Raspbian (http://www.raspbian.org/) which is built to use the hardware floating point unit.