OpenGD77

What I did one some other radios is write a pin scanning function, which writes to Segger RTT Print. It constantly scans all pins and prints if any pin changes its value. My method was a bit more rudimentary :lol: I used a multimeter to test for continuity pin by pin. Then I could find out what eac...

I forget the exact differences. I know one type, you set an interrupt when one pin changes from Low to High (or perhaps High to Low) and read the other pin. But the version in the RT3S seems to be different and generates multiple pulses. The rotary encoder in my RT3S is terrible, it skips all the t...

BTW, I might ask for help later with the rotary control. It's exactly the same as the MD-UV380/390 uses (not the one in the GD77S). I haven't figured out yet how it works, but first I need to make the firmware work and the radio boot up

Another option for storage is to solder an I2S EEPROM to the I2S connections to the AT1846S. This is effectively what the GD-77 has, as both the EEPROM and AT1846S share the same I2S bus. Or if you don't want GPS, then perhaps use the connectons to the AES chip That's actually a great idea. I'll tr...

Do any of the pins to this chip support UART RX? Because it could be an easy way to connect a GPS module You read my mind! That's my next step if I manage to make the firmware work and make the radio usable (as there is no flash, I can't use voice prompts, but I've developed on paper a way to opera...

All of the radios seem to have a chip like this. The GD77 diagram show it as ALPU-MP-1413. The MD9600 shows it as HRV-3000S. Yeah, at first I thought it was an ALPU-MP clone or copy, as it’s also connected to the I2C in the GD77. But I wasn’t sure, as I checked the datasheet and the ALPU has 6 pins...

Hi! I'm trying to port the OpenGD77 firmware to a couple Retevis RT50 (aka TYT MD-680D), that also uses the MK22, C6000, AT1846S, the RT3S rotary, etc. So far I've mapped the entire MK22 100 pins (took me ages), found out how the "hidden" 7-segment display works and I'm currently working on the sour...

Doesn't happen for me, or any of the people who normally test the firmware That is weird. Mine is a 390, not 380, maybe that's where the problem is. I'm still surprised as internally they are the same radio, only waterproof. Haven't found any other problems though. Also, it only happens in the menu...

I'm gonna buy another of this radios in case the newer ones never get supported. Does anyone know if this problem is present too with the MD-UV390 (not 380) GPS version? I suppose it is, as internally they are the same radio, but I hope they are using older stock for the 390. I just asked the seller...

Thanks for your work! That was an annoying problem and it's great that you managed to fix it. I'll check out the calibration screen when I have time, but at the moment, the "Factory Cal" option doesn't stay on, when I go back to the setting is back in "No". I was trying yesterday the safe power-on o...