marcelstoer/nodemcu-max7219

A NodeMCU library to write to MAX7219 8x8 matrix and 7-segment displays using SPI

Hi there 👋

I'm Marcel and GitHub is - at times - my second home.

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nodemcu-max7219's Issues

Allow to write arbitrary byte[] rather than table of chars

Add scrolling support

Add oscillation support

Add "rotate" parameter to setup(), extend rotation in write()

Basic rotation, reflecting the design of the display (modules combined this or that way), should be set during setup(). An extra rotation during write() would make a nice addition, in particular if angles of 90, 180 and 270 degrees would be supported :)
(BTW, what about mirroring?)

Allow to set font table so you can write strings rather than byte[]s

Something like this maybe:

fontTable = {{}, {}, ...} -- or load from file
max7219.setup({ numberOfModules = 4, slaveSelectPin = 8, font = fontTable })
max7219.write("abcd", { rotate = "left" })

Example code does not work: max7219.lua:70: bad argument #1 to 'ipairs' (table or rotable expected, got nil)

The example code does not work:

[MAX7219] number of modules: 4, SS pin: 8
max7219.lua:70: bad argument #1 to 'ipairs' (table or rotable expected, got nil)
stack traceback:
	[C]: in function 'ipairs'
	max7219.lua:70: in function '?'
	max7219.lua:177: in function 'write'
	summy2.lua:3: in main chunk
	[C]: in function 'dofile'
	stdin:1: in main chunk

NodeMCU version:

NodeMCU custom build by frightanic.com
	branch: master
	commit: 22e1adc4b06c931797539b986c85e229e5942a5f
	SSL: false
	modules: bit,bme280,cjson,file,gpio,i2c,mqtt,net,node,spi,tmr,u8g,uart,wifi
 build 	built on: 2017-04-17 16:21
 powered by Lua 5.1.4 on SDK 2.0.0(656edbf)

Addition: Set/clear/toggle individual pixels

Currently, text output is the major focus of the module.
For simple graphics and effects, it should be possible to set/clear individual pixels (or rectangles), or toggle them.
The latter functionality would require to keep an image of the display in memory, I think.
Having a bit pattern in memory would also provide support for scrolling (issue #3) and what I think "oscillation" (issue #4) means...

Addition: Write to specific module

Right now, for multiple 7-segment modules, it just extends the length of the string that can be written. But it would be great if you could write text to a specific module.