12f675_fuse_about_to_blow!

[LEDave]

Hi mackrackit

Well that was easy....

Only because you and Henrik are such good teachers....!

We need to think of something harder

Ok, but be gentle with me.

How about this:

Yup, Write code and set the hardware up so whatever you send to the PIC® echos bach to the PC

From an earlier brief.

Dave

[HenrikOlsson]

Looking good Dave! As you see the Select Case can provide a much cleaner look than the IF THEN in some cases. What you also can do is have a CASE ELSE where you "capture" invalid input (anything BUT + - / *).

You have a lot of Pauses in there that doesn't need to be there if there's no specific reason for it.

Now, since you have the LCD, why not make the messages appear on it instead of the PC-screen? You can still receive the "commands" thru the PC, to begin with.

[LEDave]

Hi Henrik,

Now, since you have the LCD, why not make the messages appear on it instead of the PC-screen? You can still receive the "commands" thru the PC, to begin with.

That would be brilliant, I'm ready when you are!

I've uploaded the PDF for the LCD.

Quick point, on my PICkit1, I'm using two 22k resistors on the DB9 data cable (pin2&3) do I still use these for the LCD?

Dave

[mackrackit]

Hey Dave,
I will but back in....

Check out the LCD section of the manual and compare to the LCD data sheet for the pin outs. Make needed adjustments and....

[LEDave]

Make needed adjustments and....

I'm not sure how much of the display I need to connect up?

How does this look / sound:

PIN1 - VSS - GND
PIN2 - VDD - +5V
PIN3 - V0 - 20k pot (contrast)
PIN4 - RegSel - PORTA.4? with 10k pull res.
PIN5 - ReadWrite - GND
PIN6 - PORTB.3?

PIN11 - D4 - I/O - Data LSB - PORTA.0?
PIN12 - D5 - I/O - Data - PORTA.1?
PIN13 - D6 - I/O - Data - PORTA.2?
PIN14 - D7 - I/O - Data MSB - PORTA.3?

The manual qoutes for a PIC16F84 I'm using a 16F684, don't forget, hence the question marks.
I'm thinking it still applies the same though.

Dave

[HenrikOlsson]

Hi Dave,
That looks OK to me. Don't forget that if your pin assignment differs from the "standard" shown in the manual (I haven't checked but I think yours is different) you need to DEFINE that as shown in the manual. Simply copy the complete DEFINE-block to your code and change it to match your setup.

/Henrik.

[LEDave]

Hi Henrik

I've bought a breadboard today and have decided to make the project on it.
So starting from scratch really.

Yes the code does need adjusting to match the manual (probably the best way around at this stage) so lots to do and think about.

If this LCD ever fires up and works it'll be a minor, no major miracle!

Dave