introduction new member

Welcome to the element14 community!  There are plenty of great projects other cool write ups that you can use to help you learn more about the ATmega 328p.  Check out all of the Arduino Projects under "Challenges & Projects/Arduino".

hello thanks for your answer,

but I wanna work without arduino, just with atmega328p, I dont wann use libray for now, for best understand the code, and leran a lithe more,

thanks

the N I can put it work nice, N=1 for 1line and N=1 for 2 line,

the DL is always 0, I think it's work good beacuse I can display caracther on displa.

but when tyr change de F to 0 or 1  nothing hapen :D

I can not imagine that the format of the commands should ever change depending on the 4/8bit mode.  Sometimes it is helpful to look at the specification of other chips that are listed as compatible.  Here is a link to a compatible chip that might help you figure out the issues.

https://www.sparkfun.com/datasheets/LCD/HD44780.pdf

Good luck.

I ported this driver to other controllers and a linux device. I also did it without Arduino. But I used their code as a starting point.

In your case, the Arduino driver is already targeted to your controller. Taking the Arduino code and removing the Arduino specifics should be a doable exercise.

You have a library that's known to work with the display. And you remove the flavour that you don't want in your code.

This is a very good point.  Working from a know good starting point (existing library), allows you to see an example of how to write your standalone software.  Also, if you have an Arduino, you can write a simple program to control the LCD, proving that it is functional.

I have some arduinos, and some times  I test with some library for check if is every thing ok., after tested onvarduido I start "coding" on MCstudio.

I will check hd44780 data sheet .

thanks

I will return with feedback

I will check this, thanks

hello

I see on the 44780, and we can coclusion they have a mystake on st7066 datasheet, on pag 20, the N and F bit are repositioned, right?

thanks

Sitronix left, Hitachi old mid Hitachi newer right

Here's a link to my port of the driver: https://github.com/jancumps/hercules_libraries/tree/master/lcd

To map code to flowchart.

Line 164 of my driver is the very first command in the lowest block:

Totally agree. Even if it's a learning exercise to do it from scratch, it is still worthwhile using existing code if possible first, as some sort of testbench, otherwise sometimes many hours can be wasted if the problem is elsewhere too (e.g. bad wiring or if the contrast voltage is physically not set correctly on the appropriate pin).

Yes. Having a working setup that you can look at, probe, ...

Else, you're always wondering if it is a hardware fault. And that does not help solving software issues.

Yes. Having a working setup that you can look at, probe, ...

Else, you're always wondering if it is a hardware fault. And that does not help solving software issues.