Matrix user forums

Hi everyone.
Has anyone made a design/program using 18F8627 succesfully?
I have been trying to make it work @20MHz but there seem to be some oscillator problem, if I make a loop with a 2mS delay and toggle a port pin I get 498Hz!
Tried to compensate this by reducing the oscillator speed in projekt options, but still it´s very hard to get it perfect.
Also when I try using the RF component it just doesnt do anything, but perhaps that it because of the oscillator speed problems.

Is this a problem to anyone else here??


Best Regards

electronix

Hello Electronix,

Do you need the frequency out from the pin to be exactly 500hz? If so then you might be better off using a timer interrupt to control the time period. The delays might have a slight overhead (this will be reported in the compiler messages) and the port out function will also create a slight overhead to the delays which may explain your missing 2hz.

Regarding the RF component problem. Could you attach your program and I will take a look for you.

Hi Ben.

Thanks for your very quick reply, the main problem is not the missing 2Hz but the lack of coms with the RF unit, I just thought it may be related someway.
Sure I´ll post the program but all it actually does is; send a byte and wait a sec.

Thanks alot Ben.

electronix

Hello,

Maybe try turning down the baud rate a bit. I think to get a baud of 19200 bps working you need to tune the transmit and receive parameters to ensure the signal comes through reliably.

Hi Ben

Ok I´ll try that straight away.

Thanks alot Ben

electronix