Debug printf to trainer port

I am now debugging my V202 protocol, and I need to see debug printfs. As far as I understand, USART is connected to trainer port, and all printout can go there. Do I need to activate it in the code, or is it always on?

Thanks, will try today. I really need some view into what happens inside, but too lazy to attach debugger etc.

PB,

may I know where is the IRQ handler located? I wish to try some code to receive data from trainer.

Thanks.

EDIT: and the TYPE=DEV only affect the std.h?

Hmm... It probably explains that I see the signal on the oscilloscope but my USB-Serial adapter (coincidentally, also based on CP2102 as yours) can't decode it. I'll check it again, but I solved the first problem using oscilloscope, not the debug print. One more to solve - correspondence between Channels and stick positions, and I have it implemented.

That I figured from the code, thanks. In Devo 10 the trainer port is connected with 4 wires, may be I am using the wrong jack so that signal is visible on oscilloscope but too week to be interpreted by the dongle I have.

Yea, I will check with another dongle which proves to be working on 3.3v. The one I used for Devo does the echo when RX and TX shorted together, but that does not mean anything about the voltage. But usually it should pick up anything higher than 2.5v (actually, even less than that) as 1, so the dongle's voltage level should not be a problem. I still think that the timing may be wrong - I looked at the oscillogramm, it does not read as clean async serial - to short space between the stop bit of a previous byte and start bit of the next. So it still needs to be investigated - I want it to be functional for more complex cases.

Thanks PB. I will try to take a look in it.

Victzh,

whats the chipset? If it is a CP2102, it should be fine. If it is CH314, it may be ok. If it is PLXXXX, it does not work for me.

Thanks, everything is as usual is simpler and wilder than my guesses. People making this, admittedly dirt cheap, adapters mixed up TX and RX and all this time I was trying to get something sensible connecting different Devo's contacts to what is proved to be TX. I figured this with the help of oscilloscope, and everything started to work. And debug print helps a lot.