nicsure

exFW880 Scan Test

A runnable firmware for the RT-880, it doesn't do anything other than a hard coded scan of the airband.

This is obviously not meant for use, it's to compare the behaviour of different radios.

There is no AM "Fix" on this, so strong signals will likely distort.

Press PTT to skip/ignore a frequency.

You'll need my firmware ...

RT-880 Coming Along

Progress is moving along steadily, more and more core functions are getting knocked out each day. That said, this is a full rewrite, so don’t expect Barry Allen-level speeds just yet. 😅

Since I’m rebuilding everything from scratch, I’ve taken the opportunity to overhaul the skinning system. In previous versions, a lot of UI object...

RT-880 Demonstration of problem solving

When you're working with unknowns.

GPIO 4 when set HIGH engages the filter not LOW,

I meant that GPIO-5 engages the UHF filter.

RT-880 Receive Working [progress post]

Note: The frequency the radio is tuned to is 433.55000 not 430.55000 which is why the H3 is showing 433.55000. Sorry about that, the text on the 880 is just printed and I forgot to change it.

Although I've not yet figured out how the UHF/VHF Filters are engaged. I have a feeling they're on the BK4819's GPIOs and I have no informa...

RT-880 Font Rendering done

Well that was a journey, had to write a whole separate app to convert fonts to something usable. But now, we're sporting a 24x32 font right there.

I know right now it doesn't seem like a much, writing text to a screen? But when you have no fonts, no docs, no reference, no idea how the LCD controller is mapped to the LCD module etc... Getti...

What I have to do.

One of the advantages of being a coder is that you can make a computer do anything you want it to, it just takes a little bit of effort. But damn, why isn't there a single app out there that can convert system fonts to bitmapped fonts? I mean sure there are a few that "claim" to do so, but they all suck at it.

Anyway, I should be OK for t...

RT-880 Display

This is a better display, 240x320, and its physical width is about the same as the RT-900's screen which is 160x128. This means the RT-880 has a finer dot pitch, as a result 16x16 fonts will appear considerably smaller. We are going to need 24x24 / 24x32 fonts, which is going to be a pain to create.

I've not gone digging in the SPI Flash b...

RT-880 Progress

Still far from a usable firmware but I'm getting peripheral usage down one by one. Remember I have absolutely no reference at all to work from, so this is way more of a grind.

Update: Now got the communication protocol down too.

RT-880 SPI-Flash Backup

See video for instructions

nicFW880 The First Steps

This may look pretty trivial but it's not, getting to this stage is a huge relief.

The TD-H3 was an 8051 based device, not exactly difficult to work out, it's a very simplistic MCU compared to ARM. For the 890 and 900 I had already working code to use as a reference. So getting a working binary for those models wasn't too problematic.

Firmware Flasher for the RT-880 (V1.3)

I do not like the self contained application firmware flasher Radtel supply at all. The biggest worry I have about it is that it requests Admin rights to run.

THERE'S ABSOLUTELY NO REASON FOR THIS AND IT'S A MASSIVE RED FLAG SOMETHING SKETCHY IS GOING ON!

So here's a proper user mode flasher (doesn't need admin...