hi there
i'm writing data to a HD44780 controlled LCD display with a PLD programmed in VHDL. but no data appears at all. the timing must be ok, as when i push the reset button on the development kit, the data appears on the screen, but only while i push the button.
after the initialization cycle (write "00111000" three times with appropriate timing, then "00111000" "00001111" "00000001" "00000110") i just write the data (rs high and rw low).
has anyone had the same problem? do i have to finish the instruction somehow with an instruction before the characters are shown on the display?
thanks in advance for any help, which is very much appreciated. have a nice day
toto