Re: [Flashforth-devel] Arduino Classic character LCD display drive

[Christopher H. <chr...@li...>]

Hi, for the legally aware: are you treating this as "trivial code", or
did you want to attach a license to it? For the small size of the
project, Apache 2.0 might be appropriate: 
https://www.apache.org/licenses/LICENSE-2.0.html
Christopher Howard

-----Original Message-----
From: craig bair via Flashforth-devel <
fla...@li...>
Reply-To: craig bair <dab...@ya...>
To: fla...@li...
Subject: [Flashforth-devel] Arduino Classic character LCD display drive
Date: Thu, 22 Apr 2021 17:39:11 +0000 (UTC)

Hi there.    Wow, and I thought I tried to do crazy stuff in
FlashForth... Recursion?
    I've landed in a pile of classic Arduinos and been asked to come up
with some I2c based programs for sensor simulation and production board
testing.  Having little or no regard for the 'Duino psudeo-C and its
environment and performance, of course I turned to FlashForth.  I'm
happy to report that a wide spectrum of Mega2560, UNO-r3, and Pro-Mini
versions all seem to run the "FlashForth 5 ATmega328 18.11.2020" and
"FlashForth 5 ATmega2560  18.11.2020" hex binaries just fine for me so
I haven't had to try recompiling (grin).
    I can also report that the  i2c-base-avr  performs well at reading
the SHT31 temperature/humidity sensors, but since there's only a polled
master mode, I'm trying to port the TWI_Master/Slave Interrupt code out
of C.  I'll let you know how that goes.
    What I discovered along the way was that the  mt128.fs  code, as
elegantly opaque as it looks, probably won't work for driving the 16x2
char LCD displays that I've got laying around.  The ATmega328 doesn't
even have 8 pins in PortC.  Neither the UNO or the ProMini have a port
with 8 pins that are free to use unless one feels like stealing the
UART pins from PortD.  It seemed reasonable to shoot for compatability
with the old LCD-Keypad Shields so I took a Sainsmart v1.0 as my guide
but ignored the buttons and gave the  R/W  line a pin in case I wanted
to read back from it. (People have been known to steal the unused
display ram for temporary storage in a pinch.)
    Not feeling comfortable with AVR assembler yet, I rewrote it in
more conventional forth.  It's not as sophisticated as what I did in
one of the Pic18 projects, but is a good functional starting point for
this class of display.  Feel free to have your way with it if it's
useful to you and post any problems you have with it.  I make no claim
of having torture-tested every possible thing that can be done to it.
    Enjoy.    craig
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