50 lines
2 KiB
TeX
50 lines
2 KiB
TeX
\subsection{Testing and Measurement}
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For functional testing and verification of implementation goals measurements
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needed to be performed in various different ways, and testing software was
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required.
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\subsubsection{Measurements}
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Measurements were performed, if not noted otherwise, with the Analog Discovery
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2 from Digilent as it has 16bit digital I/O Pins as well a a Waveform generator
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and 2 differential oszilloscope inputs\cite{ad2}. These were enough for all
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nescessary measurements. Though due to the size and construction of the device,
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which can be seen in figure \ref{fig:ad2},
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errors were encountered while performing the measurements. These are noted on
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occurance.
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\begin{figure}[H]
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\centering
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\includegraphics[width=.6\textwidth, angle=0]{pics/ad2}
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\caption{Digilent Analog Discovery 2;Source: \url{https://www.sparkfun.com/}}
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\label{fig:ad2}
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\end{figure}
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\subsubsection{Testing}
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All testing was performed with an Atmel ATMega2560 due to it's large amount
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of I/O pins, 5V I/O, which is the more common voltage level on CMOS
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peripherals, way of addressing pins (8 at a time) and availability.
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\cite{atmega2560} All
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testing software was written for this ATMega and compiled using the avr-gcc
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from the GNU-Project.
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To fully test the developed modules on the backplane a seprate module for the
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ATMega was developed, which can be seen in figure \ref{fig:atmega_mod}. The
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ATMega is beneath the the black PCB \footnote{Printed circuit board} in the
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center, which is an Arduino\texttrademark Mega. The Arduino\texttrademark is,
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for all indends and purposes, only a breakout of the ATMega 2560 and has only
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been used in that way. No parts of the Arduino\texttrademark IDE or other parts
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of the Arduino\texttrademark software suite have been used, as they consume too
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much memory and the abstraction models used are not compatiable with building
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processor peripherals.
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\begin{figure}[H]
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\centering
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\includegraphics[width=\textwidth, angle=0]{pics/atmega}
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\caption{The ATMega 2560 module for the backplane}
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\label{fig:atmega_mod}
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\end{figure}
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