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It's better ATXmega256, 256kb flash, 16kb ram, 32MHz clock, 16bit, 7 USART , but TQFP 64 has a slightly different pin arrangement. You would need a pcb adapter or you could switch several paths.

The pinout is correct, but if you can achieve 420k bitrate with it. It costs a few dollars on ali, so you could buy an evaluation board and check it out, but I know PXX2 like nothing. The issue remains 16MHz and the 8 bit core. Therefore, it is crucial to find out what exactly this PXX2 in the R9M d...

Maybe upgrading to the ATMEGA2561-16AU CPU Chip ?: https://openrcforums.com/forum/viewtopic.php?f=95&t=3819&start=120#p74105 This is another idea, but you need to know PXX2 thoroughly. I have not checked if the pins match and are the same as with Atmega128. Has anyone ever done this to good...

I only considered 128. What he said is that since the 128 has more flash it has moer features implemented, and thus even less available RAM. The second one slightly reduces delays, but taking into account the human reaction time to min. about 500ms, what's the difference between 525ms and 510ms del...

I only considered 128. Secondly, atmega can also work in the terminal option only for ACCESS settings, such as in Cisco TeraTerm. If there is an intermediary cpu, there may be many concepts. When I have a moment, I will make a block drawing as I see it, because I am already thinking something up in ...

PXX2 is made by FrSky, yes. Look at the UI for ACCESS in the OpenTX simulator and the code and you'll probably understand all the things the radio has to store and know about to operate ACCESS stuff. Your STM may be able to handle the communication but you still need everything in the radio to inte...

While an external module could be used to handle the data signalling, the radio itself needs to hold data in RAM, that is read from the EEPROM, which is the configuration of ACCESS for the current model. This cannot be put in the external module. Due to the way ACCESS works, making something that l...

Hi, could you please write me a few sentences about who developed and owns the PXX2. Or is it the Frsky company? If you can help, write something about PXX2, it will be easier for me to get to the sources.

The ATMEAGA (64 and 128) also doesn't have enough spare RAM for all the additions. The Access protocol needs quite a bit of RAM, and as it also supports 24 channels, even more RAM will be needed to support the extra 8 channels. The ACCESS protocol is also full duplex and more than just telemetry is...

Unfortunately the PXX2 protocol, for an external module, runs at 420000 baud, which is 2.38uS per bit. The 9XR signal pin to the module has no UART or timer associated with it, so it is "bit-banged" as an output. It is not possible to meet this timing, while allowing the required interrup...

Flash ACCST firmware to your R9M. I did it, but I have two receivers only on ACCESS (R9MX and R9SX - they didn't give the software on ACCST). Besides, the band scan won't work because ACCST is old. On the Polish forum I found out that the PXX2 protocol is talking between the module and 9XR and I am...

Hi everyone, I recently bought a R9M from a Chinese and found it does not work with the ACCESS firmware from the 9XR. The latest soft, as I uploaded to my Turnigy 9XR, is er9xProv822j and the newer one has nothing to support the R9M module. The problem is that this firmware only supports R9M modules...