Graphics on ESP8266

[espruino-discuss]

Posted at 2017-02-11 by navas

Hi Everyone,

Is anyone knows how to display on Max7291?

I am trying to create a Graphics buffer as mentioned on

http://www.espruino.com/MAX7219

var g = Graphics.createArrayBuffer(8,8,1); // Create graphics

But getting an "Uncaught Reference" error :(

Can anyone help?

Thanks
Navas

[espruino-discuss]

Posted at 2017-02-11 by navas

Ok, I figured 1v91 doesn't have Graphics library inbuilt, so I had to use 1v86.171.

Now, the following example doesn't display "Hi" rather it displays some weird characters on the display. Any idea?

https://goo.gl/photos/8qLAqh571H3u8rTH6

var SPI2 = new SPI();
SPI2.setup({mosi:D0, sck:D2});
var disp = require("MAX7219").connect(SPI2, D3);

var g = Graphics.createArrayBuffer(8,8,1); // Create graphics
g.flip = function() { disp.raw(g.buffer); }; // To send to the display

g.drawString("Hi");
g.flip(); // update what's on the display

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Posted at 2017-02-11 by @MaBecker

or download 1v91 with Graphics 512K or 4MB

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Posted at 2017-02-11 by navas

@MaBecker
I am using esp-01 upgraded version (1MB), Do you have a version which I can flash?

Thanks
Navas

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Posted at 2017-02-11 by @MaBecker

you can use the 512K version

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Posted at 2017-02-11 by navas

Thanks, I will give it a try.

@MaBecker, did you see the image? Do you have any idea what is causing this problem?

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Posted at 2017-02-11 by Wilberforce

@navas, try changing the baud rate, I think the default is 50,000.

Try 100,000

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Posted at 2017-02-11 by Wilberforce

@navas how will you use in the esp-01 it only has 2 gpio pins?

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Posted at 2017-02-12 by navas

@MaBecker, I tried flashing the 512KB version, but it didn't work. Getting continuous message like this

rl.l��|.�là|....�.lì.b|��.ì.�r�b�.b�ònn�lnn�âì.b.pì�lrlrlpònà....�.l......b.nâ|.lìl��b�ònnî.l��l`.�..nn.�.l..nr���n...ll`.pònà....r���âà....b.nâ|.ì���b�ònnî..�l`.�..nn.�.l..nr���n..�.l`.pònà....r���âàì...b.nâ|.l��.b�ònnî..�l`.�..nn.l`...nr���n..r.l`..r��n..r.l`.rl��n��ònn���â�r.nnn�.l�b�bp�lb.l..ì.�lì.���......�..�lll~rl..ì.�llln�â.......�.l�ll.l..ì.�l��nà�.nì�n~..��llà�b..llpb�.br��ìl`nl�p�ìl`bl`.l��n..�n��ânl�|.b....l...l

So I had to revert to the 1v86.171 version. This is the command I have used

esptool.py --port /dev/tty.SLAB_USBtoUART --baud 115200 write_flash   --flash_freq 40m --flash_mode qio --flash_size 8m   0x0000 "boot_v1.6.bin" 0x1000 espruino_esp8266_user1.bin 0xFC000 esp_init_data_default.bin 0x1FC000 blank.bin

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Posted at 2017-02-12 by navas

@wilberforce, Once you setup the Wifi I can use ESP-01, RX / TX pins. They are simple connected to D3 and D1, please check the following image

http://take.ms/wEC8B

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Posted at 2017-02-12 by @MaBecker

Hi @navas,

first erase the flash and then use the flash setting for 512KB listed in README_flash.txt

     _____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
              |_| http://espruino.com
 1v91.2149 Copyright 2016 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
Flash map 512KB:256/256, manuf 0xe0 chip 0x4016
WARNING: *** Your flash chip does not match your flash map ***
> 

you can ignore the warning, but you should seriously think about a donation

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Posted at 2017-02-12 by navas

you can ignore the warning, but you should seriously think about a donation

I would love too! How do I a do it. I have a paypal account.

Thanks
Navas

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Posted at 2017-02-12 by @MaBecker

http://espruino.com/Donate and click on the donate button - it offers PayPal too

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Posted at 2017-02-12 by navas

@gfwilliams Just placed an order for pico from official tindie, order # 64437.

http://take.ms/WuHIh

Also donated $5 with paypal. Confirmation number: 8GF29176FL1303242

I am not making any money using Espruino / ESP8266. I am just a hobbyist. :)

But I love working with Espruino on my spare time. It makes myself alive. I love this community and thanks for doing this great work!

Espruino Rocks!

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Posted at 2017-02-12 by navas

@wilberforce changed the baud rate. No luck yet!

I guess it is best suitable for numbers and HELP!

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Posted at 2017-02-12 by Wilberforce

@navas
Sorry - I was not clear. Not the connection baud rate, the SPI baud rate to connect to your LCD module:

http://www.espruino.com/Reference#l_SPI_setup

SPI2.setup({mosi:D0, sck:D2,baud:100000});

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Posted at 2017-02-13 by navas

@wilberforce,

Yes, I did try exactly what you have mentioned, but no luck so far...

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Posted at 2017-02-13 by Wilberforce

I think the debug output will use one the D2. You would need to disable both the uart and the debug uart - as the serial output could be upsetting your spi output

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Posted at 2017-02-13 by @MaBecker

try this pins

// NodeMCU ESP8266
SPI1.setup({sck:NodeMCU.D5,mosi:NodeMCU.D7,baud:100000});

// Native ESP8266
SPI1.setup({sck:D14,mosi:D13,baud:100000});

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Posted at 2017-02-13 by Wilberforce

He is using an esp-01 so won't have those pins!

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Posted at 2017-02-13 by @MaBecker

Sorry - shame .....

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Posted at 2017-02-14 by navas

Nope, tried with ESP-12E as well. Ended up with the same result.

But thanks for the response, appreciate it.

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Posted at 2017-02-14 by Wilberforce

The NodeMcu:Dx notation that @MaBecker referenced maps to the PIN numbers as labelled on the board.

If you use D0 this is gpio0 , and not the PIN label on the board...

Do you understand what I'm trying to say?

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Posted at 2017-02-14 by navas

Yes, I understand that. I am not using node MCU notation, just plain 12E. Also I see that displaying "--HELP--" and numbers works just fine. But with Graphics I couldn't get it work.

Thanks for the response.

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Posted at 2017-02-14 by Wilberforce

ok . so you can write text and numbers to the display.

It is not clear what you actual issue is. What graphics are you trying to display?

If you posted some code, perhaps it would be apparent what you are trying to do?