I'm constantly expanding my understanding of all the options and systems within the APM 2.5 by re-reading the wiki and looking for things that have changed or things that I hadn't considered before.
One thing that has recently caught my eye was the section here in the ArduPlane wiki titled
'How to flash the Atmega32U2 (PPM encoder) through USB'
The downloads section title description states
The wiki page was most recently updated almost a year ago (Dec 29, 2011) and doesn't specify what versions it applies to.....I don't know why this text is coming out italicized....I don't have Italics on...anyway the wiki instructions specifically refer to APM 2.0 not 2.x and the images are all of an APM 2.0 board. I realize that this is just a representation of the board at the time but it doesn'tmake any reference to APM 2.5.The downloads section here statesAPM 2.x ArduPPM Firmware v2.3.13 (recommended update for Futaba radio users)
ArduPPM v2.3.13 ATMega32U2 firmware for APM 2.xSo is the upgrade necessary for APM 2.5 or not, and is there a list of Futaba receivers known to
have n issue with the stock PPM encoder firmware? So perhaps if someone could clarify this itwould be great, also are the instructions in the wiki still applicable to an APM 2.5?
Regards,
Nathaniel ~KD2DEY
Replies
Hi all. How can you tell which version does the board have? Is there any software to check it? Thanks!
I just ran some Futaba 8ch receiver tests using oscilloscope pass-fail detection on the ppm output signal from the 32u2. I ran the tests on a APM2.0 board with the latest ArduPPM firmware before the glitch patch (V2.2.68). Radio I used is the Futaba 9C Super radio with TM-8 FASST transmitter in 8 channel mode.
R608FS:
Then I ran tests on the OrangeRX FASST receiver that Marco has reported problems with.
OrangeRX FASST:
@Marco, can you say if the Futaba F/S was on or off on your radio?
I assume this is all for 2.4GHz Futaba radios and doesn't affect any of the older 72MHz stuff right? I just ask because I use a 9C for FPV work and will be installing the APM 2.5+ in a plane and tricopter. From what I gathered, it's likely only a newer 2.4GHz issue but it would be good to know if I really need to care about this.
I used Spektrum for any of my 2.4GHz stuff so at least that shouldn't be affected.
Based on what I've been able to find on Futaba's website I would suspect that the following receivers when used with the compatible transmitters (most but perhaps not all of which are listed following the list of receivers) outputting in either MULT or MLT2 modes will experience the same issue with the PPM encoder on the APM 2.5.
Receivers: R608FS, R6008HS, R6014FS, R6014HS, R6108SB, R6208SB, R6203SB, R6203SBE, R6202SBW, R6303SB, R6303SBE
Transmitters: T8FG, T8FG SUPER, T10C, T10CG, TM14, T18MZ, T14SG
If you have one of these Receivers/Transmitters and can cofirm or add to this list that would be great!
I can confirm that the R6208SB that ships with the T8FG Super does in fact have an issue with ArduPPM firmware before 2.3.13.
Regards,
Nathaniel ~KD2DEY
Sorry if this is hard to read, I was having all sorts of format issues while typing! The text was italicized when I didn't want it to be, the font changed when I didn't change it, and the word wrap stopped working! Ah well I guess you'll get the point anyway.
Regards,
Nathaniel ~KD2DEY