Proof that the nRF52832 is a beast of computation power

RE: Proof that the nRF52832 is a beast of computation power

Fabien Comte — Sat, 19 Mar 2016 21:02:42 GMT

Here is the final prototype board :-) Sub meter vertical displacements catched by GPS. fabiencomte.tumblr.com/.../voir-des-mouvements-verticaux-relatifs-inférieurs

RE: Proof that the nRF52832 is a beast of computation power

Fabien Comte — Mon, 29 Feb 2016 20:52:44 GMT

Screen is 128 x 64 monochrome => 8192 bits => 1024 bytes

I use a double buffer so about 2 x 1024 bytes + 1024 bytes as decompression work buffer + few more bytes.

So say less than 4 Kbytes RAM.

Cat animation is 35.7 Kbytes uncompressed and 21.1 Kbytes after custom compression.

RE: Proof that the nRF52832 is a beast of computation power

Anders Strand — Mon, 22 Feb 2016 10:13:16 GMT

Cool stuff! What resolution is the screen, and how much memory is used for storing and processing the image?

RE: Proof that the nRF52832 is a beast of computation power

wlgrd — Mon, 22 Feb 2016 08:22:42 GMT

Nice :)

RE: Proof that the nRF52832 is a beast of computation power

Fabien Comte — Sun, 21 Feb 2016 19:45:31 GMT

Hello,

I cannot provide any source because this is the property of my client but i found that during my pre research (github.com/.../u8glib). I have not used it because I have written a special graphics lib that minimise SPI transferts to minimum to maximum avoid radio perturbations for GPS*.

*: fun fact, I did some tests. Average bytes count exchanged to update image pass from more than 1 Kbytes to 35 bytes (I just send deltas) !!! On GPS cold start for difficults conditions (indoor), first fix is up to 2 times faster (mean on multiple tries) when I activate minimisation in my lib.

RE: Proof that the nRF52832 is a beast of computation power

wlgrd — Sat, 20 Feb 2016 07:16:38 GMT

@fabien, Really cool work! Do you have any source available for this?

RE: Proof that the nRF52832 is a beast of computation power

Fabien Comte — Wed, 17 Feb 2016 10:34:44 GMT

I checked that I can prepare / transfert a lot of FPS (with Saleae Logic analyser) but pixels are so light grey that it's not acceptable for a confortable human read.

But in my case I will use the display for a portable device with a low FPS target (4) and it's not a problem. The screen is transflective and that's useful, you can read it outside (with sun) and consumption is quite low (if you not activate RGB backlight or heating for sure). On the demo video, partial green backlight was activated. Without backlight it's very 90's Nintendo Gameboy style.

RE: Proof that the nRF52832 is a beast of computation power

Wojtek — Tue, 16 Feb 2016 17:32:37 GMT

Nice! Sad that display limited real framerate, but good to see that anyway.

RE: Proof that the nRF52832 is a beast of computation power

Luis — Tue, 16 Feb 2016 09:00:31 GMT

Nice! Would be great to see what is achievable with a higher refresh speed screen. :)