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Recent Forum Posts

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 Today, 01:22

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

Excellent news,,
jackberg1 Today, 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 Yesterday, 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 Yesterday, 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 Yesterday, 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 Yesterday, 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

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

ASM , very impressif code,

thanks.
jackberg1 - 7th October 2025, 08:17

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

its always better to use the hardware than bit-banged routines and there is nothing better than a ring-buffer to overcome traffic snarls

...
richard - 7th October 2025, 02:57

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