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Author Topic: DotStar/SPI library  (Read 3520 times)

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Offline Ivoah

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DotStar/SPI library
« on: July 01, 2015, 04:17:57 am »
I'm working on a super simple SPI library for the TI-8[34]\+( C?SE)? calculators. The goal is to be able to control some Adafruit DotStar individually addressable LEDs with my calculator. I have the basic SPI part done, and I've managed to bang out a "library" for controlling up to 256 LEDs from the linkport. Here's a picture of it running on my 84+ SE:


The code can be found here: https://github.com/Ivoah/z80DotStar

You might notice the two microcontrollers on the breadboard, don't worry, I didn't cheat ;) The one on the bottom is an Arduino Micro and is only being used for 5V, and the one on the top is an ESP8266 + FT232H breakout (uart/gpio/i2c/spi to USB) that just happen to be occupying the other half of the breadboard. You can see the edge of ESP8266 on the far left of the image. The spi.asm file is easily usable in another project, just #include it at the bottom of you code.
« Last Edit: July 01, 2015, 04:20:28 am by Ivoah »


  • Calculators owned: TI-86 (now broken), TI SR-56, TI-Nspire CX CAS, TI-84+ SE, TI-84+ SE, TI-85, TI-73 Explorer VS, ViewScreen, TI-84+ CSE, TI-83+ SE

Offline xlibman

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Re: DotStar/SPI library
« Reply #1 on: July 01, 2015, 05:03:56 am »
Do you think you could display parts of the LCD content on a LED grid with this? O.O
  • Calculators owned: TI-57, 73, TI-80 (broken), TI-81, TI-82, TI-83, TI-83+ (broken), TI-83+ (broken), TI-83+SE (broken), TI-84+, TI-84+CSE, TI-84+CE, TI-85, TI-86, TI-89T, TI-92, TI-Nspire, TI-Nspire CX (semi-broken), HP 39gII, HP Prime, Casio fx-7000G, fx-7400G+, fx-7700GE, fx-9750G+, fx-9750GII, fx-9860G, cfx-9850G, FX-1.0+, fx-CG10, fx-CP400
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Offline Ivoah

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Re: DotStar/SPI library
« Reply #2 on: July 01, 2015, 05:10:35 am »
Do you think you could display parts of the LCD content on a LED grid with this? O.O

Easily, if you had enough you could mirror the entire LCD, but that would require 320*240=76800 LEDs, and at $0.36 a pop, that'd be $27,648, not to mention the crazy power requirements and the fact that my program can only handle 256 LEDs. A feasible application for this would be light painting.
  • Calculators owned: TI-86 (now broken), TI SR-56, TI-Nspire CX CAS, TI-84+ SE, TI-84+ SE, TI-85, TI-73 Explorer VS, ViewScreen, TI-84+ CSE, TI-83+ SE

Offline xlibman

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Re: DotStar/SPI library
« Reply #3 on: July 01, 2015, 05:14:19 am »
Wait, don't you mean 96x64, since it's for the 84+? That said, it would still be pretty expensive. >.<
  • Calculators owned: TI-57, 73, TI-80 (broken), TI-81, TI-82, TI-83, TI-83+ (broken), TI-83+ (broken), TI-83+SE (broken), TI-84+, TI-84+CSE, TI-84+CE, TI-85, TI-86, TI-89T, TI-92, TI-Nspire, TI-Nspire CX (semi-broken), HP 39gII, HP Prime, Casio fx-7000G, fx-7400G+, fx-7700GE, fx-9750G+, fx-9750GII, fx-9860G, cfx-9850G, FX-1.0+, fx-CG10, fx-CP400
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Offline Streetwalrus

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Re: DotStar/SPI library
« Reply #4 on: July 01, 2015, 06:46:34 pm »
Oh nice. It can only handle one-way communications though but it's still possible to implement a half duplex system for it I guess.
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Offline Snektron

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Re: DotStar/SPI library
« Reply #5 on: July 01, 2015, 06:51:54 pm »
I was actually hinking of tha a while ago, controlling another LCD with a 84+.
You can probably do it with a few SIPO's :P
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Offline Streetwalrus

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Re: DotStar/SPI library
« Reply #6 on: July 01, 2015, 07:01:34 pm »
Mgos did that with an arduino actually. It was pretty neat.
  • Calculators owned: TI-80, HP 40G, TI-84 Plus rev G (yay 128k RAM), TI-83 Plus Silver Edition (broken LCD), TI-82 Stats.fr (black), TI-Nspire CX rev C (yay Nlaunchy), TI-83+ SE ViewScreen



Offline Ivoah

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Re: DotStar/SPI library
« Reply #7 on: July 01, 2015, 09:20:54 pm »
Wait, don't you mean 96x64, since it's for the 84+? That said, it would still be pretty expensive. >.<

Well, it will run on either, just a change of include file and header tokens. The latest version actually has a define for choosing target.
  • Calculators owned: TI-86 (now broken), TI SR-56, TI-Nspire CX CAS, TI-84+ SE, TI-84+ SE, TI-85, TI-73 Explorer VS, ViewScreen, TI-84+ CSE, TI-83+ SE

Offline alexgt

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Re: DotStar/SPI library
« Reply #8 on: July 02, 2015, 12:17:24 am »
That is awesome O.O!
Now I remake Nagoji 4x3 on Ti-84+ :P
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Offline xlibman

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Re: DotStar/SPI library
« Reply #9 on: July 06, 2015, 03:30:20 am »
Wait, don't you mean 96x64, since it's for the 84+? That said, it would still be pretty expensive. >.<

Well, it will run on either, just a change of include file and header tokens. The latest version actually has a define for choosing target.
Aah I see now. Thanks for the clarification :)
  • Calculators owned: TI-57, 73, TI-80 (broken), TI-81, TI-82, TI-83, TI-83+ (broken), TI-83+ (broken), TI-83+SE (broken), TI-84+, TI-84+CSE, TI-84+CE, TI-85, TI-86, TI-89T, TI-92, TI-Nspire, TI-Nspire CX (semi-broken), HP 39gII, HP Prime, Casio fx-7000G, fx-7400G+, fx-7700GE, fx-9750G+, fx-9750GII, fx-9860G, cfx-9850G, FX-1.0+, fx-CG10, fx-CP400
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Offline Ivoah

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Re: DotStar/SPI library
« Reply #10 on: October 12, 2015, 03:16:26 pm »
bump

I made this for the 4th of July and forgot to update the topic here


It's kind of hard to see, but the LEDs are cycling through red, white, and blue.
  • Calculators owned: TI-86 (now broken), TI SR-56, TI-Nspire CX CAS, TI-84+ SE, TI-84+ SE, TI-85, TI-73 Explorer VS, ViewScreen, TI-84+ CSE, TI-83+ SE

Offline xlibman

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Re: DotStar/SPI library
« Reply #11 on: October 13, 2015, 06:29:02 am »
I was expecting some fireworks :P, but glad that the calculator is safe. THis is cool, by the way :). Was it hard to control from the calc?
  • Calculators owned: TI-57, 73, TI-80 (broken), TI-81, TI-82, TI-83, TI-83+ (broken), TI-83+ (broken), TI-83+SE (broken), TI-84+, TI-84+CSE, TI-84+CE, TI-85, TI-86, TI-89T, TI-92, TI-Nspire, TI-Nspire CX (semi-broken), HP 39gII, HP Prime, Casio fx-7000G, fx-7400G+, fx-7700GE, fx-9750G+, fx-9750GII, fx-9860G, cfx-9850G, FX-1.0+, fx-CG10, fx-CP400
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Offline Ivoah

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Re: DotStar/SPI library
« Reply #12 on: October 14, 2015, 01:10:24 am »
I was expecting some fireworks :P, but glad that the calculator is safe. THis is cool, by the way :). Was it hard to control from the calc?

Not really, it's just a static animation right now, but I'm trying to make a GUI using DCS. Here's what I have so far:
  • Calculators owned: TI-86 (now broken), TI SR-56, TI-Nspire CX CAS, TI-84+ SE, TI-84+ SE, TI-85, TI-73 Explorer VS, ViewScreen, TI-84+ CSE, TI-83+ SE

Offline xlibman

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Re: DotStar/SPI library
« Reply #13 on: October 14, 2015, 03:00:23 am »
Oh that would be nice for controlling, since some people earlier asked on IRC for an hardware schematic, meaning that they probably are interested in reproducing your hardware mod. :)
  • Calculators owned: TI-57, 73, TI-80 (broken), TI-81, TI-82, TI-83, TI-83+ (broken), TI-83+ (broken), TI-83+SE (broken), TI-84+, TI-84+CSE, TI-84+CE, TI-85, TI-86, TI-89T, TI-92, TI-Nspire, TI-Nspire CX (semi-broken), HP 39gII, HP Prime, Casio fx-7000G, fx-7400G+, fx-7700GE, fx-9750G+, fx-9750GII, fx-9860G, cfx-9850G, FX-1.0+, fx-CG10, fx-CP400
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