PIC24FJ EPMP / EDS issue

[jmusselman64]

Hello,

I'm converting an application to Mickrobasic that uses the PI24FJ128GA204 on the Microchip PIC24 Curiosity board.
The code uses the EPMP on that chip to drive an LCD display using a circular buffer and timer.

So far so good except for the following:

Code: Select all

dim LCDCMD as word absolute 0x8000             ' RS = 0  For each address, bit 15 is set to trigger EDS. (See datasheet)
dim LCDDAT as word absolute 0x8002             ' RS = 1

These lines give 'Bad absolute address' errors.

From what I can tell, the area above 0x7FFF is undefined in the .mlk file for that chip.

Is this function unimplemented in Mikrobasic?
If so, how would I attempt this ?

Thanks,
Jerry

[filip]

Hi,

I have tried this in the 7.1.0. version (latest) and I could compile this without any errors.

Regards,
Filip.

[jmusselman64]

Thanks, Filip...

..but I should have included the entire test code:

Code: Select all

program EPMP_test

dim LCDCMD as word absolute 0x8000             ' RS = 0  For each address, bit 15 is set to trigger EDS. (See datasheet)
dim LCDDAT as word absolute 0x8002             ' RS = 1

main:
'   Main program 

LCDCMD = 0x55

LCDDAT = 0xAA

end.

This gives the errors I mentioned.

Thanks, Jerry

[filip]

Hi,

The addresses above 0x8000 belong to Extended Data Space, which is currently not supported by the compiler,
the compiler allocates 8K of RAM for this device (you may see this upon compilation).

Maybe I can do a little tweak in the MLK file, but I'm not sure that it will work, I will let you know.

Regards,
Filip.

[jmusselman64]

Thanks Filip...I'd appreciate anything you can do.

I think this module would be a good addition to Libstock when finished.

Jerry

[jmusselman64]

Hello Philip,

I'd really like to implement this chip in a project...have you been able to find a work-around for the compiler to recognize the EDS memory ?

Thanks much,
Jerry