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Groups > comp.arch.embedded > #30789

Convert 16x2 chars display to big TFT display

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I have a CPU board that interfaces to a standard 16x2 chars display, 
based on HD44780 controller.

I'd like to replace this display with a full-color big TFT display, 
maybe 10", but I can't change the firmware of the CPU (because I don't 
have the source code and I can't rewrite it, because of cost and time).

The simple idea is to create an interface between the current CPU board 
and the TFT display. This interface should be able to detect the signals 
from the CPU and that was directed to HD44780, interpret the 
instructions (write CGRAM/DDRAM and so on) and write the same things to 
the big TFT display.

Of course, exactly the same texts will be written on TFT display (of 
course with a bigger and visible font) and this is acceptable.

So the MCU on the interface should be able to read 8 data bits, RS and 
R/W signals syncronous to signal E.

I'm thinking to configure E signal as an external interrupt on the 
falling edge. In the interrupt, I read data bits, R/W and RS and decode 
the instruction or data.

Any suggestions? Maybe a similar code is already online.

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Thread

Convert 16x2 chars display to big TFT display pozz <pozzugno@gmail.com> - 2021-09-21 12:31 +0200
  Re: Convert 16x2 chars display to big TFT display Reinhardt Behm <rbehm@hushmail.com> - 2021-09-21 13:44 +0000
    Re: Convert 16x2 chars display to big TFT display pozz <pozzugno@gmail.com> - 2021-09-21 16:01 +0200
      Re: Convert 16x2 chars display to big TFT display Reinhardt Behm <rbehm@hushmail.com> - 2021-09-21 15:07 +0000
      Re: Convert 16x2 chars display to big TFT display Stef <me@this.is.invalid> - 2021-09-21 17:09 +0200
        Re: Convert 16x2 chars display to big TFT display pozz <pozzugno@gmail.com> - 2021-09-21 18:48 +0200
  Re: Convert 16x2 chars display to big TFT display Don Y <blockedofcourse@foo.invalid> - 2021-09-21 19:34 -0700
    Re: Convert 16x2 chars display to big TFT display olaf <olaf@criseis.ruhr.de> - 2021-09-22 06:04 +0200
      Re: Convert 16x2 chars display to big TFT display Don Y <blockedofcourse@foo.invalid> - 2021-09-21 21:38 -0700
    Re: Convert 16x2 chars display to big TFT display pozz <pozzugno@gmail.com> - 2021-09-22 08:49 +0200
      Re: Convert 16x2 chars display to big TFT display Don Y <blockedofcourse@foo.invalid> - 2021-09-22 00:58 -0700
      Re: Convert 16x2 chars display to big TFT display Rick C <gnuarm.deletethisbit@gmail.com> - 2021-10-01 21:52 -0700
    Re: Convert 16x2 chars display to big TFT display Rick C <gnuarm.deletethisbit@gmail.com> - 2021-10-01 21:40 -0700
  Re: Convert 16x2 chars display to big TFT display Michael Schwingen <news-1513678000@discworld.dascon.de> - 2021-10-31 14:42 +0000

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