Hi all, I am interfacing 16x2 character LCD to P89LV51 and using 8bit interface mode, I am initializing the LCD by this sequence function set - 0x38 display control- 0x0f entry mode set- 0x06 cursur shift- 0x14 clear display - 0x01 and finally displaying the string but after initializing, display is blank, instead of busy check, i used delay then, still the display is void. I used the LCD initialization as given HD44780U datasheet. Still No display. But Same LCD is working actually with some other code. Can somebody tell me the exact problem.
your device has a series of strict timing requirements related to power supply and bus usage. have you verified that you are compliant?
But Same LCD is working actually with some other code
look at her code and seee the direfences.
Hi my frend,
Please post your project (simplified if you want) in a zipped or rared form to rapidshare, including also the asm with the working hardcoded delays.
Sorry but I dont' have a program with busy checking but Im'm working with code also in very diffucult assembly, hope I can help you.
However, my quick ideas are here:
1. Also for check only the busy flag (bit 7) you must read back the whole byte (both nybbles) !! 2. Do you make the proper port (data pins) direction alterings ? (onley the busy checking needs ouput(and input ?????) 0...3 as inputs)
zuisti
(chief programmer)