A practical UPDI programmer with automatic UART / UPDI selectionDesigned by MCUdude in Norway
What is it? The MCUdude SerialUPDI programmer is a tiny programmer for use with any AVR that has a UPDI programming interface. It can also be used as a standard USB to serial adapter for easy serial …Read More…
The MCUdude SerialUPDI programmer is a tiny programmer for use with any AVR that has a UPDI programming interface. It can also be used as a standard USB to serial adapter for easy serial debugging.
I made this board because there doesn't exist a SerialUPDI-based programmer that can automatically switch between UART and UPDI mode. It's also very convenient that the board can supply either 3.3V or 5V to the target. Unlike the microUPDI programmer, this programmer supports the AVR-DA, AVR-DB and AVR-DD series as well. It's also significantly faster than the microUPDI.
When the programmer is set to AUTO, it is the RTS handshake line that determines the mode. This means that the upload tool has to set this to active (low level) in order for the programmer to switch over to UPDI mode. On the other side, the serial monitor program has to set the RTS line to inactive (high level) in order for the programmer to switch over to UART mode. Avrdude and Pymcuprog set the RTS line active when programming, but serial monitors aren't that consistent. If the upload tool or serial monitor doesn't do anything with the RTS line, the RTS line would do whatever the default behavior is, depending on the OS driver.
|SerialUPDI AUTO mode||Windows||MacOS||Linux|
|Arduino serial monitor||Works||Does not work||Not yet tested|
|Platformio serial monitor||Works||Works||Works|
When using the SerialUPDI programmer with the PlatformIO serial monitor, please add the folling snippet to your platformio.ini file. (I have no idea why their serial monitor, Miniterm, believes the RTS pin actually is DTR, but it works!)
(For some reason Tindie doesn't let me format the snippet below correctly.
--dtr and 0 must each be indented with two spaces or more)
|Supported targets||All AVRs with UPDI||ATtiny and ATmega's with UPDI|
|Fully assembled||Yes *||No (Pro Micro not included)|
|Microchip Studio / MPLAB X support||No||Yes|
|USB to serial/UART||Yes (native)||Yes (emulated, limited baud rate)|
|Target power||5V / 3.3V / none||5V / 3.3V / none|
* 6-pin programming connector not soldered
1x SerialUPDI board, assembled 1x 6-pin female header 1x 6-pin male header
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