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<title>Tiny PIC bootloader</title>
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<h1>Usage for Tiny PIC bootloader</h1>
<p>After you browse or enter the name of the hex file, select the COM port and
baud rate:</p>
<ol>
<li>You can keep the TinyBootloader interface opened, then click WriteFlash, or
double-click the tray icon, and after that reset (or power-up) the PIC. If your
program is continuously sending serial data to PC, (that will be interpreted
as a bootloader response) use the second method:<li>first press PIC reset,
click WriteFlash, then release PIC reset;<li>Use a hardware (RTS) or
software reset (codes to send first).</ol>
If all things are set up properly the program will be loaded into the pic and
executed.
<H3>Write Flash</H3>
<div align="left">
<table border="1" width="800" style="border-collapse: collapse" id="table5">
<tr>
<td valign="top">
<img border="0" src="tbld06.gif"></td>
<td valign="top">
<ol>
<li>
<p align="left">Connects to the specified port with the chosen baud rate
(both are editable, any value can be typed in)</li>
<li>
<p align="left">Reads and analyzes the hex file, determines if it's a 16F or 18F
code, determine the size, eeprom and
config data; check for a goto in the first 4 words, and gives warnings if
necessary;</li>
<li>
<p align="left">Pings the serial port (with the "Code sent by PC for
activation") at a rate given by "Timeout" until there is a response from the PIC or
until the "SearchDelay" timeout will expire.</li>
<li>
<p align="left">When a response from the PIC is received the PIC type is
identified and the user program written.<br>
(no eeprom or config words are written. if needed, this can be done by using
one of the available commands).</li>
</ol>
</td>
</tr>
</table>
</div>
<h3>Commands</h3>
<div align="left">
<table border="1" width="800" style="border-collapse: collapse" id="table2">
<tr>
<td valign="top">
<img border="0" src="tbld01.gif"></td>
<td valign="top">Command line parameter: hex filename to be written.
<p>When using a command line parameter writing flash will start
automatically.</p>
<p> </td>
</tr>
</table>
</div>
Some commands that can be written in the Log window:<table border="1" cellspacing="1" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="table1">
<tr>
<td width="30%"><font face="Courier" size="2">?</font></td>
<td width="70%"><font face="Courier" size="2">help</font></td>
</tr>
<tr>
<td width="30%"><font face="Courier" size="2">ontop </font></td>
<td width="70%"><font size="2">keep the window on top of the others</font></td>
</tr>
<tr>
<td width="30%"><font face="Courier" size="2">logdetails </font></td>
<td width="70%"><font size="2">lists detailed stuff happening inside (used only for debugging)</font></td>
</tr>
<tr>
<td width="30%"><font face="Courier" size="2">clearallflash </font></td>
<td width="70%"><font size="2">clears all flash except the bootloader (actually it <b>fills</b>
all flash with FFh)</font></td>
</tr>
<tr>
<td width="30%"><font face="Courier" size="2">writeeeprom <addr> <dat></font></td>
<td width="70%"><font size="2">writes the byte <dat> at the address <addr> (numbers can be
either dec or hex)<br>eg: <font face="Courier"> writeeeprom 0 b6h
</font> -
writes B6h in the first eeprom location</font></td>
</tr>
<tr>
<td width="30%"><font face="Courier" size="2">writeconfig <adrLow> <dat></font></td>
<td width="70%"><font size="2">only for 18F; writes the configuration byte <dat> at the
address 300000h+<addrLow><br>eg: <font face="Courier"> writeconfig 3 FFh
</font> -
activates WDT</font></td>
</tr>
</table>
<p align="left"> </p>
<h3>Options</h3>
<table border="1" width="800" style="border-collapse: collapse" id="table3">
<tr>
<td valign="top">
<img border="0" src="tbld02.gif"></td>
<td valign="top">
<ul>
<li>
<p align="justify">List of codes to send first: could be interpreted by a user
program as a reset (or activate bootloader command);</li>
<li>
<p align="justify">"SearchDelay" is the amount of time the
application will try to contact the pic.</li>
<li>
<p align="justify">"Timeout" is the ping interval; also it acts as a
timeout for all serial operations. If you expect large
communication delays, you should increase this (but don't forget to
also increase the timeout in tinybld)</li>
</ul>
</td>
</tr>
<tr>
<td valign="top">
<img src="resetPIC.gif"></td>
<td valign="top">
<ul>
<li>Reset could also be performed by hardware, "Reset PIC using RTS
line". There are several ways to do it; some require that after
reset the RTS should remain low, others prefer "RTS to remain
active"</li>
</ul>
</td>
</tr>
</table>
<h3>Terminal</h3>
<table border="1" width="800" style="border-collapse: collapse" id="table4">
<tr>
<td valign="top">
<img border="0" src="tbld04.gif"></td>
<td valign="top">A rudimentary Terminal, with the following
possibilities:<ul>
<li>Display received data as text, hex dump or character codes.</li>
<li>Automatically saves raw data to the specified file (rewrite at
every terminal activation).</li>
<li>Can send:<ul>
<li>ascii string</li>
<li>one by one characters as you type</li>
<li>decimal or hex codes</li>
</ul>
</li>
<li>It has a limited (adjustable) display buffer (default 10k)</li>
</ul>
</td>
</tr>
</table>
<p align="center">
</p>
<h2>What do you need</h2>
<H3>Hardware</H3>
<ul>
<li>An external programmer is needed (only) the first time in order to write the bootloader into the PIC</li>
<li>On your board, you must have the PIC (pins TX,RX) connected to the serial port of the PC
(pins Rx,Tx), usually using a MAX232 level converter:<br>
<img border="0" src="max232.gif" width="450" height="236"> </li>
</ul>
<H3>Software</H3>
<ol>
<li>You can use one of the provided .hex files or</li>
<li>Modify tinybld.asm and assemble it using MPASM IDE (or Mpasmwin.exe)
<ul>
<li>Modify "xtal", "baud", "_??_OSC" to what you need; assemble it
(for example with .\MPLAB\MCHIP_Tools\Mpasmwin.exe); write the
HEX it with a PIC programmer; put the PIC on you board and connect it to the PC
serial port.</li>
</ul>
</li>
<li>Requirements for your program:<ul>
<li>The program must meet this requirement: it must have in the first 4 words of
memory a GOTO to the start of the main program. (this is what the majority of the bootloaders require).
So in assembler it should look something like this:<table width=300 style="border-collapse: collapse; font-family:courier; font-size: 75%; padding: 0 3 0 3;" border="1" id="table6">
<tr>
<th>PIC16F</th>
<th>PIC16F</th> <th>PIC18F</th>
</tr>
<tr>
<td>org 0<br>;clrf STATUS<br>clrf PCLATH<br>goto Main</td>
<td>org 0<br>;clrf STATUS<br>pagesel Main<br>goto Main</td>
<td>org 0<br>goto Main<br>
<br>
</td>
</tr>
</table>
<li>If you use a compiler, search the help for a directive that allows
coexistence with a bootloader;</ul>
</li>
</ol>
<p>Critics and suggestions at: <img src="../clmail.gif" width="169" height="15"></p>
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