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LCD PROBLEM

PRANAM gharat

hi,i am working on lpc 2106 .i have interfaced lcd in 4bit mode succesfully.

pins i used when it is working. EN=P0.22 RS=PO.23

D4=P0.3 D5=P0.4 D6=P0.5 D7=P0.6

but to use spi port i have changed data lines
to
D4=P0.26
D5=P0.27
D6=P0.28
D7=P0.29

direction control and pinsel i have checked several times it seems to be ok.

is DGBSEL need to be grounded?
i heve left unconnected is this the cause of problem?

Parents
  • 0 in reply to PRANAM gharat

    From your description we should think that you are praying for the LCD to work by magic.

    1) How are you initializing the display? What and how many are the init sequences you are sending, and what is the period between init sequences?
    2) Are you sending any data to the display at all?
    3) Are you paying attention to the LCD control lines timing? The ARM is a quite fast processor, so you can easily send pulses less than 100ns wide.
    4) What is the VCC of the LCD and the ARM?
    5) Are you sure the output signals are being generated at all?

Reply
  • 0 in reply to PRANAM gharat

    From your description we should think that you are praying for the LCD to work by magic.

    1) How are you initializing the display? What and how many are the init sequences you are sending, and what is the period between init sequences?
    2) Are you sending any data to the display at all?
    3) Are you paying attention to the LCD control lines timing? The ARM is a quite fast processor, so you can easily send pulses less than 100ns wide.
    4) What is the VCC of the LCD and the ARM?
    5) Are you sure the output signals are being generated at all?

Children
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