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

[CuriousOne]

Ok, measured I2C CLK speed. it is about 48khz. So I guess, this is the main issue, right?

[tumbleweed]

Well, that's going to make I2C operations about ten times slower than what it could be running at.

A while back you mentioned using software SPI and complained about it being slow too.
You'd probably find the same sort of issue.

The builtin high-level commands make things easy to use, but you pay a price for that.

[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.