gibberish output when printing (ESP32 + micropython)

[palmerabollo]

Hi, I'm trying to print BMP images in a Tiny Thermal Printer using your code and following your detailed post and https://kapusta.cc/2017/12/16/printing-bitmaps-with-a-thermal-printer/ (thanks).

This is how the image I'm using for my tests looks like, that is taken from your repo (https://github.com/ayoy/micropython-thermal-printer/blob/master/gfx/aykm.bmp):

And this the output I get:

I've tried different BMP formats, using printBitmapFromFile & printBMPImage, using LaaT=True and LaaT=False

This is the only attempt that somehow resembles the original image:

printer.printBitmapFromFile(384, 384, "image.bmp", LaaT=True)

Do you know what could be happening?

Additional info:

• The printer is powered with 2A/5V and printing text works fine.
• I am using the params heatdots=1, heattime=155, heatinterval=1 the same way you did at https://github.com/ayoy/micropython-thermal-printer/blob/master/printertest.py#L64=
• I am using UART2 pins (tx=17, rx=16)

I've spent a couple of weeks trying to figure this out... any idea about what could be the cause or what else could I try would be really appreciated.

Thank you.