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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

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\end_layout

\begin_layout Standard
\begin_inset Graphics
	filename /home/jmz/qm/ede/docs/img/dbg/debugger_overview.svg
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\begin_layout Standard
\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
bigskip
\end_layout

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

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\backslash
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Function
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Arguments
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Description
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snd
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byte
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\begin_layout Plain Layout
send a byte to the emulator via a serial or file buffer
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\begin_layout Plain Layout
rcv
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byte, length
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receive length number of bytes from a serial or file buffer
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step
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-
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\begin_layout Plain Layout
Execute instruction at PC
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run
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-
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Execute instructions from PC until a break point is reached
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set_reg
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register address, value
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\begin_layout Plain Layout
Set a register (register address between 0 and 16 as described under Memory
 Design in the Emulator Design section)
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get_reg
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register address
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\begin_layout Plain Layout
Get the value of a register
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set_flag
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flag bit, 0 or 1
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Turn a flag bit on or off.
 LSB = 0, MSB =7
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flag bit
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Get the value of a flag bit
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address high, address low, length high, length low, [byte array]
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Set a block of memory of arbitrary length with the bytes in the byte array
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Read a block of memory of arbitrary length 
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Get value of A
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Get Value of IR
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run_len
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Run for length number of instruction
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Run forever - Bypass controller
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break point index, address high, address low
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Set 1 of 8 possible break points
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\begin_layout Standard
The class also has the attribute 'Emu' which can be set to change between
 serial and file mode for the snd and rcv functions.
\end_layout

\begin_layout Standard
\begin_inset Newpage pagebreak
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\end_layout

\begin_layout Standard
The debuggers
\end_layout

\begin_layout Subsection
cli.py
\end_layout

\begin_layout Section
Debugger Testing
\end_layout

\end_body
\end_document