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#LyX 2.0 created this file. For more info see http://www.lyx.org/
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\begin_body

\begin_layout Part
The Debugger
\end_layout

\begin_layout Section
Design
\end_layout

\begin_layout Standard
The debugger is designed to issue commands to and receive data from an instant
 of the emulator running either as a process or on a micro-controller.
\end_layout

\begin_layout Standard
\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
bigskip
\end_layout

\end_inset


\end_layout

\begin_layout Standard
\begin_inset Graphics
	filename /home/jmz/qm/ede/docs/img/dbg/debugger_overview.svg
	display false

\end_inset


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\begin_layout Standard
\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
bigskip
\end_layout

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\end_layout

\begin_layout Standard
The debugger will implement the protocol described under the Emulator Design
 section of this report.
\end_layout

\begin_layout Standard
\begin_inset Newpage pagebreak
\end_inset


\end_layout

\begin_layout Section
Implementation
\end_layout

\begin_layout Subsection
dbg.py
\end_layout

\begin_layout Standard
The debugger has been implemented as a Python class with the following functions
\end_layout

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status open

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\backslash
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\begin_layout Plain Layout
Function
\end_layout

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Arguments
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Description
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snd
\end_layout

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byte
\end_layout

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</cell>
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\begin_inset Text

\begin_layout Plain Layout
send a byte to the emulator via a serial or file buffer
\end_layout

\end_inset
</cell>
</row>
<row>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
rcv
\end_layout

\end_inset
</cell>
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\begin_inset Text

\begin_layout Plain Layout
length
\end_layout

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</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
receive length number of bytes from a serial or file buffer
\end_layout

\end_inset
</cell>
</row>
<row>
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\begin_inset Text

\begin_layout Plain Layout
step
\end_layout

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<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
-
\end_layout

\end_inset
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
Execute instruction at PC
\end_layout

\end_inset
</cell>
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<row>
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\begin_inset Text

\begin_layout Plain Layout
run
\end_layout

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\begin_inset Text

\begin_layout Plain Layout
-
\end_layout

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</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
Execute instructions from PC until a break point is reached
\end_layout

\end_inset
</cell>
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\begin_layout Plain Layout
set_reg
\end_layout

\end_inset
</cell>
<cell alignment="left" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
register address, value
\end_layout

\end_inset
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
Set a register (register address between 0 and 16 as described under Memory
 Design in the Emulator Design section)
\end_layout

\end_inset
</cell>
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<row>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
get_reg
\end_layout

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\begin_inset Text

\begin_layout Plain Layout
register address
\end_layout

\end_inset
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
Get the value of a register
\end_layout

\end_inset
</cell>
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\begin_inset Text

\begin_layout Plain Layout
set_flag
\end_layout

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</cell>
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\begin_inset Text

\begin_layout Plain Layout
flag bit, 0 or 1
\end_layout

\end_inset
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
Turn a flag bit on or off.
 LSB = 0, MSB =7
\end_layout

\end_inset
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get_flag
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flag bit
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\begin_inset Text

\begin_layout Plain Layout
Get the value of a flag bit
\end_layout

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set_block
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\begin_inset Text

\begin_layout Plain Layout
address high, address low, length high, length low, [byte array]
\end_layout

\end_inset
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
Set a block of memory of arbitrary length with the bytes in the byte array
\end_layout

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get_block
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address high, address low, length high, length low
\end_layout

\end_inset
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
Read a block of memory of arbitrary length 
\end_layout

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get_a
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-
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<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
Get value of A
\end_layout

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get_flags
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-
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Get value of flags
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get_ir
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-
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\begin_layout Plain Layout
Get Value of IR
\end_layout

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run_len
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length high, length low
\end_layout

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Run for length number of instruction
\end_layout

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free_run
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-
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\begin_layout Plain Layout
Run forever - Bypass controller
\end_layout

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set_bp
\end_layout

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</cell>
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\begin_inset Text

\begin_layout Plain Layout
break point index, address high, address low
\end_layout

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</cell>
<cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
Set 1 of 8 possible break points
\end_layout

\end_inset
</cell>
</row>
</lyxtabular>

\end_inset


\end_layout

\begin_layout Standard
The class also has the attribute 'Emu' which can be set to point the debugger
 at either an emulator process or a serial port.
\end_layout

\begin_layout Standard
\begin_inset Newpage pagebreak
\end_inset


\end_layout

\begin_layout Standard
The rcv function needs to check that the emulator's output buffer is the
 correct length before returning the data to the user.
 Below is a pseudo-code representation of how this is achieved.
\end_layout

\begin_layout Standard
\begin_inset listings
lstparams "basicstyle={\ttfamily},captionpos=b,frame=tb,framexbottommargin=1em,framextopmargin=1em,keywordstyle={\color{blue}},tabsize=4"
inline false
status open

\begin_layout Plain Layout

rcv ( length ):
\end_layout

\begin_layout Plain Layout

	while output buffer size != length:
\end_layout

\begin_layout Plain Layout

		wait
\end_layout

\begin_layout Plain Layout

	return output buffer
\end_layout

\end_inset


\end_layout

\begin_layout Subsection
cli.py
\end_layout

\begin_layout Standard
This file offers the user a text based interface to the debug class.
 It implements the following commands:
\end_layout

\begin_layout Standard
\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
bigskip
\end_layout

\end_inset


\end_layout

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Function
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run
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run
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sr
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set_reg
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<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

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gr
\end_layout

\end_inset
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\begin_inset Text

\begin_layout Plain Layout
get_reg
\end_layout

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\begin_inset Text

\begin_layout Plain Layout
sf
\end_layout

\end_inset
</cell>
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\begin_inset Text

\begin_layout Plain Layout
set_flag
\end_layout

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</cell>
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gr
\end_layout

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\begin_inset Text

\begin_layout Plain Layout
get_flag
\end_layout

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sb
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set_block
\end_layout

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\begin_inset Text

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gb
\end_layout

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get_block
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\begin_inset Text

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ga
\end_layout

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\begin_inset Text

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get_a
\end_layout

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gf
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\begin_inset Text

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get_flags
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gir
\end_layout

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get_ir
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runl
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run_length
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frun
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free_run
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sbp
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set_bp
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exc
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exc
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status open

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\backslash
bigskip
\end_layout

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\begin_layout Standard
Commands are issued at a terminal followed by any arguments separated by
 a space.
 The exc function enables the interpreter mode described in the EDE Use
 Cases section above.
\end_layout

\begin_layout Standard
\begin_inset Newpage pagebreak
\end_inset


\end_layout

\begin_layout Standard
Symbols are defined which map parts of the emulators memory to the encoding
 used in the control functions.
 Tables are provided below.
\end_layout

\begin_layout Standard
\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
bigskip
\end_layout

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\end_layout

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<column alignment="center" valignment="top" width="0">
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Register
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Encoding
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R0_0
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\end_layout

\begin_layout Section
Debugger Testing
\end_layout

\begin_layout Standard
The debugger was tested with an automated test method using python scripting.
 The script uses the debug controller class to fill all of the emulators
 memory structures with known values.
 It then requests these values back and compares the results, if the values
 are not the same the test fails.
 The test then steps through the emulators entire memory space, and then
 checks the program counter to see if it has reached the end.
 The test files and results can be found in the Supporting Material.
\end_layout

\end_body
\end_document