How to check oscillator frequency

[mister_e]

yeah... it run but the default OSC speed is set to 32KHz

just add those

OSCCON= %01100000       ' configure internal OSC  @ 4MHZ
While OSCCON.2=0 : wend ' wait until OSC is stable

at the top of your code.

For the configuration bits, it's usual and recommended to set them in your code, have a look at the following...

http://www.picbasic.co.uk/forum/showthread.php?t=543

and here's a short example for a 18F2431, as inspiration source

        '
        '       Pic Configuration
        '       =================
        ASM         
        __CONFIG _CONFIG1H, _OSC_IRCIO_1H  & _FCMEN_OFF_1H & _IESO_OFF_1H
        __CONFIG _CONFIG2L, _PWRTEN_ON_2L & _BOREN_ON_2L & _BORV_45_2L
        __CONFIG _CONFIG2H, _WDTEN_OFF_2H & _WINEN_OFF_2H 
        __CONFIG _CONFIG3L, _T1OSCMX_OFF_3L & _HPOL_LOW_3L & _LPOL_HIGH_3L & _PWMPIN_OFF_3L
        __CONFIG _CONFIG3H, _MCLRE_ON_3H
        __CONFIG _CONFIG4L, _LVP_OFF_4L & _DEBUG_OFF_4L
        ENDASM
        DEFINE OSC 4

Now if you want to switch to the external OSC, use...

        ASM         
        __CONFIG _CONFIG1H, _OSC_HS_1H  & _FCMEN_OFF_1H & _IESO_OFF_1H
        __CONFIG _CONFIG2L, _PWRTEN_ON_2L & _BOREN_ON_2L & _BORV_45_2L
        __CONFIG _CONFIG2H, _WDTEN_OFF_2H & _WINEN_OFF_2H 
        __CONFIG _CONFIG3L, _T1OSCMX_OFF_3L & _HPOL_LOW_3L & _LPOL_HIGH_3L & _PWMPIN_OFF_3L
        __CONFIG _CONFIG3H, _MCLRE_ON_3H
        __CONFIG _CONFIG4L, _LVP_OFF_4L & _DEBUG_OFF_4L
        ENDASM
        DEFINE OSC 8

and remove the OSCCON & WHILE : WEND lines

[Johan]

Thank you Mr.E,

On my programmer's setup page ( easypic ) there are configuration bits to setup ( see attachment ) . If I put the configuration at PBP, will this be a problem ?

[mister_e]

Nope, there's no problem at all. In fact, if you set the bits in your code, you'll no longer need to set them in Picflash as they're now included in the .HEX file.

Try the above, a click on 'Reload HEX'. You'll see that the Oscillator bit have change to HS or INT RC... depending which code above you have used.

I also have that board. Can't live without now

[Johan]

Mr.E,

I tried to put those asm lines, and got error messages :
Error 118 bla,bla,bla : Overwriting previous address content

But my problem is solved just by adding : define OSC 8

[mister_e]

Yeah, but it seems you didn't read the first link i sent?

Read it (from post #1 to at least #5), and you'll know why it happen, and how to solve it.

[Johan]

Hi Steve,

I did read the posts and "still" try to understand it.
I forgot to mention that I use MPASM 5.03 assembler, because PM does not have inc file for 18F4431 ( or does it ? )

Melanie said :
3.b. When using Microchip's (MPASM) Assembler

If you're going to use MPASM, look for the appropriate file (example for a 16F628 look for P16F628.INC) located in something like the MCHIP_Tools subdirectory of your MPLAB installation. Here you’ll find the Configuration Bits located near the bottom of the list. Simply just use the ones you want. Hey presto your PIC is all defined and ready to run.

But how ? I am new to PBP, please help


Thanks,

Johan

[skimask]

I did read the posts and "still" try to understand it.

Old version. Latest is 5.11. Download MPLAB IDE v 7.61 (maybe 7.62 by now)

I forgot to mention that I use MPASM 5.03 assembler, because PM does not have inc file for 18F4431 ( or does it ? )

PM does NOT support 18Fxxxx.

Melanie said :
3.b. When using Microchip's (MPASM) Assembler
If you're going to use MPASM, look for the appropriate file (example for a 16F628 look for P16F628.INC) located in something like the MCHIP_Tools subdirectory of your MPLAB installation. Here you’ll find the Configuration Bits located near the bottom of the list. Simply just use the ones you want. Hey presto your PIC is all defined and ready to run.
But how ? I am new to PBP, please help

Edit the file using WORDPAD, NOTEPAD, or any other pad you can find, comment out the config bits you're NOT wanting and un-comment the rest.