Maybe a bug ?

[fmelle]

Hello all,

Dealing with battery voltage calibration, I may have found a bug.

I do have a DSM2 module installed in the Turnigy 9x and a switch that enable the radio to either use the standard JR port on the back or the inside DSM2 module (from LP4DSM). When I calibrate the voltage on a model using PPM (for the standard flysky module plugged in the back), it is OK as long as I stay on models in PPM. But when I swith to the model on DSM2 protocol, the voltage shifts and get 0.7v less ... If I calibrate it on DSM2, it is OK until I switch to a model using PPM protocol ! Then it is +0.7V

It acts this way whatever the switch mode is, meaning it is not an hardware issue but a software one.

Does anyone noticed that ?

[erazz]

That's really weird. I don't seem to have this problem....

Could you post your EEPROM file here?

[Kilrah]

How did you wire the switch? Does it cut the power line or PPM line (or both)?

[fmelle]

I do have ground for both module then either one module has PPM and VCC either the other module ...

Changing switch does not change battery voltage behaviour.

FYI, I have the LCD backlight module in the 9x with the transistor ... No other mods except the wires to program the er9x. For the eeprom, it is 1am here in France, I will post it tomorrow.

I am on open9x firmware for now.

[fmelle]

OK, back from work, it is 8:07pm and I have updated my 9x with open9x-r515 version is V2.00H, date of firmware is 2012-04-11, EEPROMv205

Here is a way to reproduct the behaviour each time on my radio :
- create 2 models : one with PPM named for exemple PPM_TEST and another with DSM2 for exemple DSM2_TEST
- calibrate the transmitter battery voltage using PPM_TEST
- change model to DSM2_TEST and exit to see voltage : voltage reading is correct
- power off / power on the transmitter => the voltage has shifted
- change model to PPM_TEST and exit to see voltage => voltage is still shifted
- power off / power on the transmitter => the voltage is now correct (as it was calibrated with PPM and booted on PPM)

If you want, I can upload the eeprom somewhere ...

[bertrand35]

Yes please!
Thanks,
Bertrand.

[fmelle]

OK, here is my eeprom file : http://www.packupload.com/AP9OXZF64DM

[fmelle]

No idea at all ?