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Recent Forum Posts

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

Great work Richard!

Works very well. Thank you.

I had to change LCD_COMMANDUS to 2000 from 1500 for best performance.

I just did not understood what all these ff's at the end of the code do....
Ioannis Yesterday, 19:00

I'm also stuck with FSR error when using DT's elapsed timer on 16F1936

No MIBAM this time :)

I tried to use original files, but they got that error, then I found this post:
...
CuriousOne Yesterday, 17:25

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

removed debug messages that are sent before spbrg set to correct value
since 1827 has more resources have increased buffer size, u may not need pacing any longer to compensate for
the 4 bit lcd...
richard Yesterday, 01:22

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

Excellent news,,
jackberg1 Yesterday, 00:14

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

Thanks Richard.

The new code:

works OK with LCD Backlight On/Off
works OK sending text over the serial port
works OK sending commands to LCD over serial port
On power up LCD shows...
Ioannis - 9th October 2025, 22:34

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

a bit out of practice , forgot porta.4 is input only plus 1827 has bits and pieces in other banks

so tested and working version

...
richard - 9th October 2025, 10:06

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

For a 1827 it would look like this [untested]

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' Name : 16F1827 LCD BACKPACK ...
richard - 9th October 2025, 01:45

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

maybe the chip?

for my part I used

12F683, 16F690 old regular Pic.

I tried richard code, and it's impressive asm code, that I can't do for sure.

so I stick to basic.
jackberg1 - 9th October 2025, 00:51

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

Tried different baud rate but still only Backlight work. The rest is just irrelevant characters on screen.

Then tried the new code of Richards, but have 1827 chip, so asm code is not compatible.
...
Ioannis - 8th October 2025, 23:34

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

here's the revised baud rate test chart

9998
jackberg1 - 7th October 2025, 11:26

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