writer_demo.py

[brylka787]

Hi Peter, i am new to micropython on the pi pico. I don't understand "writer_demo.py".

Create a display instance

verbose = False to suppress console output

and "ssd1306_setup.py" else: # I2C

Pyb SSD

     #3v3 Vin
     # Gnd Gnd
     # Y9 CLK
     # Y10 DATA
     if soft:
         pscl = machine.Pin('Y9', machine.Pin.OPEN_DRAIN)
         psda = machine.Pin('Y10', machine.Pin.OPEN_DRAIN)
         i2c = machine.I2C(scl=pscl, sda=psda)
     otherwise:
         i2c = machine.I2C(2)
     ssd = SSD1306_I2C(WIDTH, HEIGHT, i2c)

I use I2C and what is if soft: I can't get "writer_demo.py" to work. Nothing on display. in https://github.com/peterhinch/micropython-font-to-py/tree/master/writer Peter

[peterhinch]

You'll need to edit ssd1306_setup.py to match the electrical connections to the SSD1306 display. Existing pin numbers are for the Pybord.

[brylka787]

Hi Peter, for the Raspberry Pi Pico I have if soft: pscl = machine.Pin((1), machine.Pin.OPEN_DRAIN) psda = machine.Pin((0), machine.Pin.OPEN_DRAIN) i2c = machine.I2C(scl=pscl, sda=psda) otherwise: registered. but other users use: i2c = I2C(0,scl=pin(1), sda=pin(0))

Can you use ssd1306_setup.py for the Raspberry Pi Pico not use at all

Peter

[peterhinch]

Hardware I2C(0) on the Pico uses GPIO9 (SCL) and GPIO8 (SDA) - alternatively GPIO17 (SCL) and GPIO16 (SDA).

from machine import Pin, I2C
i2c = I2C(0, scl = Pin(9), sda = Pin(8))

You need to specify the pins because the Pico has two alternative pinouts for I2C(0). [EDIT] Also note that internal pullups are too weak for I2C. If your display does not have them fitted, you need two external resistors from SCL-3.3V and from SDA-3.3V. These should be in the range 1-10KΩ - I normally use 4.7KΩ.

[brylka787]

Hi Peter,

Thanks again for the info with pull-up resistors. and the multiple assignments of the pins for the I2c bus. At the Pico.

I'm a Python beginner and was fascinated by the module

ssd1306_setup.py

with the transfer of the parameters for the definition from the program.

writer_demo.py

and return with return.

But I still don't understand what that means.

verbose = False to suppress console output

in writer_demo.py

Is that from if verbose: print('Orientation: {} Reversal: {}'.format('horiz' \ if font.hmap() else 'vert', font.reverse()))

from writer.py and how to change.

Peter

[peterhinch]

You pass the verbose flag as an optional third argument to the Writer constructor. To suppress console oututput, pass False:

wri = Writer(ssd, freesans20, False)

[brylka787]

Hi Peter,

Thanks, Now I'm slowly beginning to understand how to pass parameters to functions and modules. And get it back too.

But I'm still looking for a solution to this SSD1306 .96 inch display the representation of cyrillic characters. I can already use font_to_py.py -x -l255. But which .TTF file can I take

Peter

[peterhinch]

I'm not sure what the problem is. There is an example in the docs for creating a font with Cyrillic characters. Clearly the TTF file must include these - to check this you could try using the TTF font on a PC before converting it.

[brylka787]

Hi Peter,

that was a bit misleading.

I didn't know at first. Where can I get a Cyrillic TTF file. And I needed a Serbian character TTF.

But I found the TTF on the internet.

And I transferred the file to a .py with font_to_py.py -x.

I can now use the Serbian alphabet on the display.

Works flawlessly.

Thank you very much again for all the information.

greeting Peter from Bamberg in Germany.

[peterhinch]

I'm glad it's working. I'm afraid I'm not much help on non-English character sets - the input on those has come from other contributors.

[brylka787]

Hi Peter,

Thanks again for the advice back then. All problems are solved. But I have a new problem. I have a new display: 1.77" TFT LCD SPI and use the module for this:

from ili934xnew import ILI9341, color565 and import tt14 import tt24

German umlauts are not included in tt14 and tt24. But I need umlauts.

tt14 and tt24 are included font_to_py.py

Code generated by font-to-py.py.

Font: CM Sans Serif 2012.ttf

version = '0.2' created. I got these from: https://github.com/jeffmer/micropython-ili9341

my self-created fonts are with:

Code generated by font_to_py.py.

Font: arial.ttf

Cmd: font_to_py.py -x -l255 arial.ttf 16 arial16255.py

version = '0.33' created.

When I use mine, I get the following error with display.set_font(arial16255):

Traceback (most recent call last): File "", line 60, in File "ili934xnew.py", line 318, in print AttributeError: 'module' object has no attribute 'get_width'

line 60 is display.print("Ä Ö Ü") line 318 is if curx + self._font.get_width(word) >= self.width:

In my arial16255.py is there end:

_mvfont = memoryview(_font) _mvsp = memoryview(_sparse) ifb = lambda l : l[0] | (l[1] << 8)

def bs(lst, val): whileTrue: m = (len(lst) & ~ 7) >> 1 v = ifb(lst[m:]) if v == val: return ifb(lst[m + 2:]) if not m: return 0 lst = lst[m:] if v < val else lst[:m]

def get_ch(ch): doff = bs(_mvsp, ord(ch)) << 3 width = ifb(_mvfont[doff : ])

 next_offs = doff + 2 + ((width - 1)//8 + 1) * 16
 return _mvfont[doff + 2:next_offs], 16, width

So the get_width(s): from tt14.py is missing.

How can I create a working arial16255.py.

Peter

[brylka787]

Hi Peter,

I was too impatient again. !!!

I have the:

font_to_py.py

from the website:

https://github.com/jeffmer/micropython-ili9341

taken and with

python font_to_py.py -l255 arial.ttf 16 arial_16255.py

created. Important: without -x for the application

And I have German umlauts.

P.S. I will still test -c and -k.

Peter

[peterhinch]

The version of font_to_py.py on that website is six years old. A lot has been done in that time :)

You might also be interested in this ili9341 driver: with that you can run nano-gui or micro-gui on these displays. Note that my recommendation of -x applies only to my display drivers. Others may well be written for vertical mapping.