12f675_fuse_about_to_blow!

[LEDave]

Hi mackrackit,

I've re-cheched my connections:

PIC12F683 on my PICKit1.

I've got common pin5 on the DB9 cable (yellow) going to VSS PIC pin8.

I've got pin3 on the DB9 cable (red) going to GPIO.0 PIC pin7.

And pin2 on the DB9 cable (brown) going to GPIO.2 PIC pin5.

Pin 5
Common, ground, zero rail...
This must be connected to both devices for any serial to work.

Pin 2
Data is sent to the PC via this pin. PIC® -->> PC

Pin 3
Data is sent to the PIC® via this pin. PIC® <<-- PC

So data is coming from the pc onto GPIO.0

data is going from the PIC to pc on GPIO.2

How does that look / sound?

Dave

[LEDave]

I've added 'modedefs.bas' and set mode '0' still no joy

 CMCON0 = %00000111 
ANSEL = %00000000 
TRISIO = %00000000 
GPIO = %00000000
 
DEFINE SER2_BITS 8

INCLUDE "modedefs.bas"

MYVAR  VAR BYTE 
 
MAIN

pause250

serin2 GPIO.0, 0, [DEC MYVAR]

IF MYVAR = 3 THEN HIGH GPIO.5
PAUSE 250
GOTO MAIN

[mackrackit]

CMCON0 = %00000111 
ANSEL = %00000000 
TRISIO = %00000000 
GPIO = %00000000

MYVAR  VAR BYTE 
 
MAIN:
PAUSE 250
SERIN2 GPIO.0, 16780, [DEC MYVAR] '2400 INVERTED
IF MYVAR = 3 THEN HIGH GPIO.5
PAUSE 250
GOTO MAIN

But if GPIO.0 is connected to the POT it may not work.

[LEDave]

Hi mackrackit

I've metered GPIO.0 out to the pot, it does seem to be connected(getting some strange readings though).

I then changed the cable from GPIO.0 to GPIO.4 (and the program to reflect the change) when I send from the serial communicator two LED's briefly flash on then off ( pretty quick though).

I increased the pause time from 250 to 2000, still only a brief flash but definately
flashing!

Dave

[mackrackit]

Two LEDs ???

GPIO.4 is connected to a LED ?

If you have a 14 pin chip try it. I think some of the pins from a 14 will go directly to the J3 header.

Making progress though!!!

[LEDave]

Hi mackrackit

Was getting there, I say was because every time I try and load a program now 'checksum verify failed' appears.Any ideas on that one.

Dave

[mackrackit]

Disconnect the serial cable from the PC?