Thank you KR, and what AVR chip do you use in your projects and testing the release? I will try to align :-)
-- CeDeROM, SQ7MHZ, http://www.tomek.cedro.info On Sun, Oct 4, 2026 at 9:54 AM <[email protected]> wrote: > > Hi, > > if I was trying to do this with a DYI solution while aiming for single > USB connection, I'd have a look at something based on FT2232H from FTDI. > Dual channel serial device, in UART mode by default but can switch > (among others) to SPI which is used by both ATMEGA128A and ATMEGA2560 > for program memory programming. > > If I am not mistaken, both of those chips could also be powered from > 3.3V output of the FTDI - albeit not with highest clock with the 2560. > > Avrdude on the PC side for uploading the program. > > I am not familiar with any AVR boards except for their name in NuttX > configuration so can't tell you if there is a solution the can be bought > and used out-of-the-box. > > As for what is the most popular chip for use in NuttX - no idea. The > arduino-mega2560 was chosen to be covered by MemBrowse Memory Report but > IDK what was the reason to pick that board specifically. There is pretty > much no development activity in arch/avr so can't judge much from that > either. If someone wanted me to recommend AVR chip for new design, I > would certainly recommend the new generation (AVR128DA28 etc.) but > support for that family was added last year so there is little chance > that it is the most popular one. > > I believe Alan was trying to run NuttX on one of the older supported > chips last year but as far as I know, could not make it work. Don't > remember which chip was that though. > > Btw. if I remember correctly, the AtMega256 has a bug in NuttX - one of > the I/O registers that facilitates access to program memory addresses > higher than 16 bits is not stored in process context. The other chips > with 128kB of flash are not affected. So I would probably not use that > one for any tests that are designed to try to break things. > > On 2026-10-03 11:37, Tomek CEDRO wrote: > > Hello world :-) > > > > I am looking for hints on how to quickly connect AVR device over > > single USB connection to have flash and shell connectivity to my test > > suite. > > > > I have several bigger devices but only as cpu module bare bones on a > > pcb so no interfacing even no power supply: ATMEGA128A and > > ATMEGA2560. > > > > Which AVR devices are most popular on NuttX? If not 128 or 2560 but > > some inexpensive board with flash+shell link onboard then I will get > > one please let me know :-) > > > > Any hints welcome :-) > > Tomek > > > > -- > > CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
