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<title>Simulavr: 4. Display Coprocesses</title>
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<meta name="description" content="Simulavr: 4. Display Coprocesses">
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<a name="Display-Coprocesses"></a>
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<a name="SEC8"></a>
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<table cellpadding="1" cellspacing="1" border="0">
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<tr><td valign="middle" align="left">[<a href="simulavr_7.html#SEC7" title="Previous section in reading order"> < </a>]</td>
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<td valign="middle" align="left">[<a href="simulavr.html#Top" title="Cover (top) of document">Top</a>]</td>
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<td valign="middle" align="left">[<a href="simulavr_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
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<td valign="middle" align="left">[<a href="simulavr_11.html#SEC11" title="Index">Index</a>]</td>
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<td valign="middle" align="left">[<a href="simulavr_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
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</tr></table>
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<h1 class="chapter"> 4. Display Coprocesses </h1>
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<p>This chapter documents the protocol that simulavr uses to pass register
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and memory information to a display coprocess.
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</p>
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<p>A display coprocess is a separate program started by simulavr for the
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sole purpose of displaying register and memory information while an AVR
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program is running in the simulator. Using a separate program and a
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standardized communication protocol, keeps the simulavr code simpler and
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allows for a variety of display programs to be used.
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</p>
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<p>When the user asks simulavr to display register and memory information
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during execution, simulavr will start a coprocess to perform the display
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work. A pipe will be opened in simulavr into which the data will be
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written using the following commands:
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</p>
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<table>
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<tr><td><p> ‘<samp>q</samp>’
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</p></td><td><p> Quit.
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</p>
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</td></tr>
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<tr><td><p> ‘<samp>r<reg>:<val></samp>’
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</p></td><td><p> Set register to val.
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</p>
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</td></tr>
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<tr><td><p> ‘<samp>p<val></samp>’
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</p></td><td><p> Set program counter to val.
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</p>
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</td></tr>
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<tr><td><p> ‘<samp>i<reg>:<val></samp>’
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</p></td><td><p> Set io register to val.
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</p>
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</td></tr>
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<tr><td><p> ‘<samp>I<reg>:<name></samp>’
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</p></td><td><p> Set io register name.
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</p>
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</td></tr>
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<tr><td><p> ‘<samp>s<addr>,<len>:XX</samp>’
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</p></td><td><p> Set sram addrs to values (one XX pair per addr).
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</p>
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</td></tr>
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<tr><td><p> ‘<samp>e<addr>,<len>:XX</samp>’
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</p></td><td><p> Set eeprom addrs to values (one XX pair per addr).
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</p>
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</td></tr>
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<tr><td><p> ‘<samp>f<addr>,<len>:XXXX</samp>’
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</p></td><td><p> Set flash addrs to values (one XXXX quad per addr).
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</p>
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</td></tr>
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<tr><td><p> ‘<samp>n<clock_ticks></samp>’
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</p></td><td><p> Update the number of clock ticks.
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</p>
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</td></tr>
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</table>
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<p>All values are hexidecimal numbers, except for <name> which is a string.
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</p>
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<p>In order for the display process to know which pipe to read the
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information, it must handle either the ‘<samp>--pfd <fd></samp>’ option or check
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the <code>SIM_PIPE_FD</code> enviroment variable. The value passed using
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either method will be the file descriptor number of the pipe from which
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the display prgram will read the informtion.
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</p>
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<p>Simulavr will start all display programs like so (sizes are decimal
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numbers of bytes and sram_start is just the decimal address of the
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first byte of sram, usually 0x60 [96] or 0x100 [256]):
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</p>
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<p>‘<samp><prog> --pfd <fd> <flash_size> <sram_size> <sram_start> <eeprom_size></samp>’
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</p>
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<p>The user can specify the display program to use via the
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‘<samp>--disp-prog</samp>’ option to simulavr or using the <code>SIM_DISP_PROG</code>
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environment variable. If both are not specified, then no display will be
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used.
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</p>
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<hr size="6">
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<tr><td valign="middle" align="left">[<a href="simulavr_7.html#SEC7" title="Previous section in reading order"> < </a>]</td>
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<p>
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