LCD 2X16 PROBLEM

[Great_Alex]

Hi all

i have a problem for interfacing lcd 2x16 (hitachi character lcd ) with mcu without use of RW pin (pin 5)
in fact when RW connected to ground
the initialize of lcd does not work and lcd does not work so

please help about this problem and if its possible share the library for overcome this problem

with best regards
Alex

[Sean_Goddard]

What programming language, what micro please?

[moodz]

...you cant do anything with the LCD if you just ground the RW ..... the RW is used to "clock" data into the device ... 1. set data on data lines then bring RW from HI to LO ( normally ) ... have to do this for each piece of data 8bit/4bit .... or HI LO HI depends on datasheet.
The device is "stuck" if you only hold RW at ground.

Please post the part number / device number or datasheet if you have it. Thanks.

[Great_Alex]

thanks sean_goddard and moodz

i solve the problem by increasing time delay after each command send to lcd for ignoring BusyFlag of lcd
i use HITACHI HD44780 LCD 2X16 AND ATMEGA8 AVR WITH C LANGUAGE (AVR Studio 6) .

[moodz]

Good one ... hope it goes well.

[Mr Eastwood]

...you cant do anything with the LCD if you just ground the RW ..... the RW is used to "clock" data into the device ... 1. set data on data lines then bring RW from HI to LO ( normally ) ... have to do this for each piece of data 8bit/4bit .... or HI LO HI depends on datasheet.
The device is "stuck" if you only hold RW at ground.
.

Hi, that's not true, the data is clocked in using the "enable" pin not the r/w pin; in nearly all cases you would tie the r/w pin to ground. I have done a few projects which included custom characters, but all you ever need to do is write commands and data to the LCD.

[Edit]

Added useful link below..

http://www.learningaboutelectronics....d-write-RW-pin