My "Library" for ST7920 Graphical displays, works fine, but...

[CuriousOne]

So only one way to get the speed, is to use SPI, but with MSSP?

[CuriousOne]

By the way, as PIC16F886 datasheet says:

Master Synchronous Serial Port (MSSP) Module
supporting 3-wire SPI (all 4 modes) and I2C™
Master and Slave Modes with I2C Address Mask

This means, I can use MSSP for I2C too, via PBP?

[tumbleweed]

Yes, the MSSP does both.

[CuriousOne]

Yes, found some sample code for hardware I2C listed here. Reading thru them slowly....

[CuriousOne]

Added "giant" size, 16x24 pixels font to the charset. But some letters need fine tuning. Once completed, will make this font .hex file free for everyone.

[CuriousOne]

Bought larger version, which has 128x64 pixels arrangement.
But the issue is, that above code can write only to upper 32 lines of display.

https://blog.projectryu.com/using-di...d-with-pic18f/

This appears to be quite similar, but not exactly, to my module. And by sending some wild bits, I found out two things:

1. it is somehow possible to adjust contrast via software, but I guess, I'm sending wrong bytes, since display hangs after this (but remaining picture has high contrast)

LCDOUT $FE, $80
LCDOUT $FE, 10

above mentioned code mentions some X variable, which seems to be the "divider" between upper and lower parts of the screen, based on this pic: https://blog.projectryu.com/wp-conte...ddress-Map.jpg

But I can't get idea, where to write it?

[CuriousOne]

Solved issue with writing to lower lines.
These screens are actually divided into 64x32 blocks, which are addressed as 256x32, but physically located as
AB
CD
So this is it.