182 lines
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182 lines
8.5 KiB
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<title>AVRDUDE: 5.3 SerialUPDI programmer</title>
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<meta name="description" content="AVRDUDE: 5.3 SerialUPDI programmer">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="SerialUPDI-programmer"></a>
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<table class="header" cellpadding="1" cellspacing="1" border="0">
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<tr><td valign="middle" align="left">[<a href="avrdude_14.html#Programmer-Specific-Information" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_16.html#Atmel-DFU-bootloader-using-FLIP-version-1" title="Previous section in reading order"> < </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_14.html#Programmer-Specific-Information" title="Up section"> Up </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_18.html#Platform-Dependent-Information" title="Next section in reading order"> > </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_18.html#Platform-Dependent-Information" title="Next chapter"> >> </a>]</td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left">[<a href="avrdude.html#Introduction" title="Cover (top) of document">Top</a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
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<td valign="middle" align="left">[Index]</td>
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<td valign="middle" align="left">[<a href="avrdude_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
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</tr></table>
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<a name="SerialUPDI-programmer-1"></a>
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<h2 class="section">5.3 SerialUPDI programmer</h2>
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<p>SerialUPDI programmer can be used for programming UPDI-only devices
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using very simple serial connection.
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You can read more about the details here
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<a href="https://github.com/SpenceKonde/AVR-Guidance/blob/master/UPDI/jtag2updi.md">https://github.com/SpenceKonde/AVR-Guidance/blob/master/UPDI/jtag2updi.md</a>
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</p>
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<p>SerialUPDI programmer has been tested using FT232RL USB->UART interface
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with the following connection layout (copied from Spence Kohde’s page linked
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above):
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</p>
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<div class="example">
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<pre class="example">-------------------- To Target device
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DTR| __________________
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Rx |--------------,------------------| UPDI---\/\/---------->
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Tx---/\/\/\---Tx |-------|<|---' .--------| Gnd 470 ohm
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resistor Vcc|---------------------------------| Vcc
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1k CTS| .` |__________________
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Gnd|--------------------'
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--------------------
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</pre></div>
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<p>There are several limitations in current SerialUPDI/AVRDUDE integration,
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listed below.
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</p>
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<p>At the end of each run there are fuse values being presented to the user.
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For most of the UPDI-enabled devices these definitions (low fuse, high
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fuse, extended fuse) have no meaning whatsoever, as they have been
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simply replaced by array of fuses: fuse0..9. Therefore you can simply
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ignore this particular line of AVRDUDE output.
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</p>
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<p>Currently available devices support only UPDI NVM programming model 0
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and 2, but there is also experimental implementation of model 3 - not
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yet tested.
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</p>
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<p>One of the core AVRDUDE features is verification of the connection by
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reading device signature prior to any operation, but this operation
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is not possible on UPDI locked devices. Therefore, to be able to
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connect to such a device, you have to provide ‘<samp>-F</samp>’ to override
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this check.
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</p>
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<p>Please note: using ‘<samp>-F</samp>’ during write operation to locked device
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will force chip erase. Use carefully.
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</p>
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<p>Another issue you might notice is slow performance of EEPROM writing
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using SerialUPDI for AVR Dx devices. This can be addressed by changing
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<em>avrdude.conf</em> section for this device - changing EEPROM page
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size to 0x20 (instead of default 1), like so:
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</p>
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<div class="example">
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<pre class="example">#------------------------------------------------------------
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# AVR128DB28
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#------------------------------------------------------------
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part parent ".avrdx"
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id = "avr128db28";
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desc = "AVR128DB28";
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signature = 0x1E 0x97 0x0E;
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memory "flash"
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size = 0x20000;
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offset = 0x800000;
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page_size = 0x200;
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readsize = 0x100;
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;
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memory "eeprom"
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size = 0x200;
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offset = 0x1400;
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page_size = 0x1;
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readsize = 0x100;
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;
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;
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</pre></div>
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<p>USERROW memory has not been defined for new devices except for
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experimental addition for AVR128DB28. The point of USERROW is to
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provide ability to write configuration details to already locked
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device and currently SerialUPDI interface supports this feature,
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but it hasn’t been tested on wide variety of chips. Treat this as
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something experimental at this point. Please note: on locked devices
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it’s not possible to read back USERROW contents when written, so
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the automatic verification will most likely fail and to prevent
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error messages, use ‘<samp>-V</samp>’.
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</p>
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<p>Please note that SerialUPDI interface is pretty new and some
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issues are to be expected. In case you run into them, please
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make sure to run the intended command with debug output enabled
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(‘<samp>-v -v -v</samp>’) and provide this verbose output with your
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bug report. You can also try to perform the same action using
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<em>pymcuprog</em> (<a href="https://github.com/microchip-pic-avr-tools/pymcuprog">https://github.com/microchip-pic-avr-tools/pymcuprog</a>)
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utility with ‘<samp>-v debug</samp>’ and provide its output too.
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You will notice that both outputs are pretty similar, and this
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was implemented like that on purpose - it was supposed to make
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analysis of UPDI protocol quirks easier.
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</p>
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<hr>
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<table class="header" cellpadding="1" cellspacing="1" border="0">
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<tr><td valign="middle" align="left">[<a href="avrdude_14.html#Programmer-Specific-Information" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_16.html#Atmel-DFU-bootloader-using-FLIP-version-1" title="Previous section in reading order"> < </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_14.html#Programmer-Specific-Information" title="Up section"> Up </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_18.html#Platform-Dependent-Information" title="Next section in reading order"> > </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_18.html#Platform-Dependent-Information" title="Next chapter"> >> </a>]</td>
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</tr></table>
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