Support for walkera telemetry.

getting off topic here now. It looks like the UP02 may be wired in reverse for rx/tx. Not really sure, but I'll see what happens if I reverse the tip and 1st ring (If you one available, short the tip and ring and see if you can use a terminal app (putty) to type and see what you enter..) Otherwise, I recommend spending a couple bucks and getting something like this:
www.ebay.com/itm/USB-2-0-to-UART-TTL-6PI...&hash=item339aeeb9e8

I'll just use a file to capture logs. I think we're still waiting on Indigo for a new build with his latest fix? After that, I'll add in some additional logging info.

Once again I will return to CYRF_SetTxRxMode()

I don't understand how it possible:
CYRF_WriteRegister(0x0F, mode == TX_EN ? 0x2C : 0x28);

I reviewed several implementations of DSM2/X protocols and as I can see they use:
CYRF_WriteRegister(0x0F, mode == TX_EN ? 0x28 : 0x2C);
CYRF_MODE_SYNTH_TX = (0x2 <<2),
CYRF_MODE_SYNTH_RX = (0x3 <<2),

How it can work with exchanged TX and RX in Deviation???

Probably I incorrectly understand how work code "mode == TX_EN ? 0x2C : 0x28".

But, very old code do the same thing:

Tested build with CYRF_WriteRegister(0x0F, mode == TX_EN ? 0x28 : 0x2C);

Nothing changed, at least for Devo protocol. All work fine.

I don't know why it is that way. perhaps because 'synth mode' is just about stabilizing the frequency after changing the channel. I double checked captures from a real devo8, and it definitely works as we've coded it.
I checked my dsm2/x logs and it is a mixed bag. Some radios use 2c for Tx, others don't' use 0x0f for forcing mode, and only use mode 0x24 (idle mode). I wouldn't be surprised if we could get rid of the mode 0x0f setting altogether.

FYI, I hooked up my logic analyzer to my UP02 and I can't get it to wiggle at all in linux using a term. There may be some magic keys sent to it to activate it or something, but regardless, it is out for now as a debug hook

What is the difference between "Synth Mode (TX)" and "Synth Mode (RX)" of CYRF6936?

In Synth Mode (TX), the synthesizer is settled to the channel frequency and the time for which it will remain in this state the synthesizer will remain tuned to this frequency. If we switch to the sleep state then the synthesizer will be switched OFF and it needs to be settled down again before transmitting.

Synth Mode (RX) is used when we are using the different frequency for transmission and reception. Before switching to the Receive mode device will switch to the Synth Mode (RX). In this the synthesizer will tune to the frequency required. Once the frequency is tuned to the Receive Frequency then the device will switch to Receive mode for reception of data, whenever required. Thus, eliminating the delay required to switch the frequency from transmit to receive.



What is the difference between "idle mode" and "RX mode" of CYRF6936?

In Idle mode the oscillator, SPI and PMU are running and it won't be receiving or transmitting. But in RX mode the oscillator, SPI, and PMU are running along with the synthesizer In this mode the device will be in the reception state. The power consumption in this mode will be more than the Idle mode.

PB, I don't quite understand from reading devo documentation about telemetry packets.

"Telemetry data is transmitted as 2 16 byte packets. Packets are sent every 2.4msec. They are processed between data packets."

What does it mean? Two telemetry packets can be received in 2.4msec, after data packet?

No, data packets are sent every 2.4msec from the tx to the rx.
data packets are also received every 2.4msec from the rx to the tx

After sending the transmit command for a data packet, the transmitter waits 700us, then starts checking for tx completeion (Reg04). It will poll Reg04 every 10us until tx completes, then switches to Rx mode. this usually happens about 950us after a packet is transmitted. Then the transmitter will look for data received. It polls Reg07 every 200us until a packets is available, at which point it is read.

Latest Indigo build 36cce5c - Devo telemetry is ON, I can see Rx voltage on Main screen, but Telemetry Monitor screen says 'Telemetry is off' (Devo 8s).

vlad_vy wrote: Tested build with CYRF_WriteRegister(0x0F, mode == TX_EN ? 0x28 : 0x2C);

Nothing changed, at least for Devo protocol. All work fine.

DSM2/X protocol also work fine.

I can't reproduce disconnect even with older builds, 36 hours with telemetry ON and Ladybird connect as usual (Devo 8s). But couple times I had lost of connection in flights.

Examples:

read.pudn.com/downloads139/doc/597220/CY...orial_1/main.c__.htm

I think we need

MyRadioAbort(RxState); // Stop the receive operation

before transmit, just in case.