On 20 Oct 2015 at 2:43, Richard R. Pope wrote:
> Hello all,
>      I am trying to get a 16f877a to talk to a
> NHD-0216BZ-FL-YBW lcd.=20
> PortD is connected to the data lines and RA0, RA1, and RA2 are the
> control lines. They are R/S, R/W, and EN in that order. I have
> checked=20
> power, ground, and the clock. These are all ok. I also checked the
> frequency and it is 7.99997 MHz with a 8.0 MHz crystal. The LCD is
> not=20
> initializing. It never goes in to 2 line mode. There is also no
> cursor.=20
> I am using MpLabX and the XC8 compiler. I am using a PICKit2 for my
> programmer. I have spent several hours trying to sort this out and I
> am=20
> stumped. Could I please get some help? Should I post the source code
> here?
> Thanks,
> Richard R. Pope
> President
> Reedsburg Area Model Railroad Club, RAMRC
> 1230 19th Street #5
> Reedsburg, WI 53959
> 608-768-7448
> mechanic_2@charter.net
> --=20
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Richard,

Be sure all analog registers are set to turn off=20
analog functions on the pins you are using for=20
control. Since each chip varies you will have tor=20
efer to the spec sheet. Do a search in your PDF=20
reader for analog and note the registers involved=20
like ADCON, etc. Read the list of bit controls and=20
set them to ensure they are off.

If you don't do that, you cannot guarantee the state=20
of the pins even if you have sent them as outputs.

Best,
Ray

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