Programming IC2 24LC256

[Sphere]

What programmer are you using with winpic.
Sphere....

[Squibcakes]

Looks like Winpic800 is a bit buggy... it works well using IC-prog -D... using my very simple 3 resistor programmer. :P

Have a great day.

Cheers
Squib

[Sphere]

I have a jdm myself, but I have used a SN7407 to buffer the signals to eliminate programing errors. Glad to see you sorted your problem.

Sphere...

[Darrel Taylor]

Yo Squib,

3 resistor programmer

Is there a link to more info on this? I've spent almost $300 on 3 different programmers.

Just feel like kicking myself in the ___, for not knowing.
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[Squibcakes]

Yo Squib,

3 resistor programmer


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DT, its kinda in my head, but based loosly on my simple programmer http://www.picbasic.co.uk/forum/showthread.php?t=703 the only difference is that VPP is not connected, so infact you only need two (2) resistors and a 5 volt supply.

Here's a cut and paste from the top of my code.....

' TO PROGRAM THE 24LC256 MANUALLY USE ICPROG-D. SELECT THE AT24C256 CHIP
' CONNECT TO SERIAL PORT USING SIMPLE PROGRAMMER
' CONNECTIONS:
' PIN1:PIN4 TO GROUND
' PIN5 TO DATA (DTR via 4.7k) + (CTS)
' PIN6 TO CLOCK (RTS via 4.7k)
' PIN7 TO GROUND (FROM MAIN PCB AND SERIAL PORT GROUND)
' PIN8 TO VCC (FROM ext 5V)

Cheers
squib

[Squibcakes]

Here's a funny one,

I was hoping to use both an LCD (4bit mode) and the above mentioned eeprom on a 16F88 chip.

Unfortunately, SDA is on Portb.1 and SCL is on Portb.4.

I'm using RA2:RA4 for the LCD contol lines...

How can I simultaneously hook up the LCD data lines and the I2C eeprom to the PIC? I've tried and it doesn't work.

I'm thinking the only way is to go a bigger PIC with more I/O pins.

Cheers Squib.

[Darrel Taylor]

Wow! Thanks Squib.

That just might save me some time programming external EEPROMs for my boards. I've been doing it by writing a program for the PIC that it's attached to. Downloading the data to the EEPROM. Then loading the actual program that will run on the PIC. So I have to load 2 or three programs for each board.

I'm feeling pretty dumb today. But tomorrow might be better.

For the combo LCD/EEPROM, I can't think of a good way to do that. I think the LCD data might confuse the EEPROM. Just by chance, it might write something you don't want it to. Or worse, cause a short circuit condition since I2C is "open drain" and LCD data is "driven" high and low. But I can say that you aren't limited to the SDA/SCL pins of the PIC, unless you are using the hardware Synchronous Serial Port to interface with it. The I2CREAD/I2CWRITE in PBP can use any pin.

Thanks again,
&nbsp; Darrel