I2C with PIC24FJ series?

[Holger]

Ok, I'm abit stymified here. I try to initialize the I2C1 on a PIC24FJ64GA002. After some days with forth I eventually tried it in Assember, where it works. But on forth I don't even seem to be able to set the registers, i.e. a

$9000 $0206 ! $0206 @

will return 0 on the stack. I even went so far as to change the "!"- routine into

mov.w [W14--], W0
mov.w #0x200,W1
cp w0,w1
bra LTU,jmp1
mov.w #0x210,W1
cp W0,W1
bra GTU,jmp1
nop ; this is the breakpoint for I2C1-tests
nop
jmp1:
mov.w #PFLASH, W1
cp W0, W1
bra GEU, STORE1
mov.w [W14--], [W0]
return

to have a look into the registers, but it looks as if "mov.w [W14--], [W0]" simply won't write within the range $200 - $220

Anything I'm missing?

[Mikael Nordman]

Yes, FF disables all unused peripherals.
Check the PMD registers.
Mike

[Holger]

Ts! I checked the PMD at Microchips reference and I checked the PMD in Assembler & at FF reset. But I didn't check it after FF initialized itself.

Now it works (i.e. I may at least set the registers)

Thanks