change program from 16f84a to 16f818 - Electronic Circuits Projects Diagrams Free

Totally blank · 3rd December 2007, 01:55 PM

Hi

Since my last posts I have had some great help from a member here to get my project off the ground, we decided pots would be best for speed and stroke so had to upgrade to the 16f818 chip

The problem now is just running a basic set of commands

Code:

loop:
StepCCW 150, 1000
WaitUs 1000

StepCW 150, 1000
WaitUs 1000

Goto loop

The above works 100% with the 84a BUT when using it in the 818 it stutters, searches, just generally behaves very erratic.

The 84a has a 4meg OSC the 818 needs to be set so we added this to the top of the file

Code:

OSCCON = 0x60

It is still verry erratic, am I missing something?

I am using the Oshonsoft Bacis compiler and ICProg

ICProg settings are intRC, CP Off, WRT Off, FUSES: PWRT & MCLR are ticked and the rest are unticked.

Any help would be greatfully appreciated, thanks

Pommie · 3rd December 2007, 02:46 PM

Have you setup ADCON1 so you have the correct pins as analogue or digital?

Mike.

ericgibbs · 3rd December 2007, 02:49 PM

hi,
Did you get my email regarding what is connected to PIC pins 15/16 on the 16F84A socket??

Totally blank · 3rd December 2007, 02:53 PM

Hi Mike / Eric

Mike ADCON1 = 0x05

Eric, yes and I sent you a reply with an image attached,let me know if you get it.

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3rd December 2007, 01:55 PM	(permalink)
Totally blank	change program from 16f84a to 16f818 Hi Since my last posts I have had some great help from a member here to get my project off the ground, we decided pots would be best for speed and stroke so had to upgrade to the 16f818 chip The problem now is just running a basic set of commands Code: loop: StepCCW 150, 1000 WaitUs 1000 StepCW 150, 1000 WaitUs 1000 Goto loop The above works 100% with the 84a BUT when using it in the 818 it stutters, searches, just generally behaves very erratic. The 84a has a 4meg OSC the 818 needs to be set so we added this to the top of the file Code: OSCCON = 0x60 It is still verry erratic, am I missing something? I am using the Oshonsoft Bacis compiler and ICProg ICProg settings are intRC, CP Off, WRT Off, FUSES: PWRT & MCLR are ticked and the rest are unticked. Any help would be greatfully appreciated, thanks

3rd December 2007, 02:46 PM	(permalink)
Pommie	Have you setup ADCON1 so you have the correct pins as analogue or digital? Mike.

3rd December 2007, 02:49 PM	(permalink)
ericgibbs	hi, Did you get my email regarding what is connected to PIC pins 15/16 on the 16F84A socket?? __________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/

3rd December 2007, 02:53 PM	(permalink)
Totally blank	Hi Mike / Eric Mike ADCON1 = 0x05 Eric, yes and I sent you a reply with an image attached,let me know if you get it.