Re: [Flashforth-devel] FF 3.8 onto newer PIC18FxxK22 chips

[Herman A. <exp...@vn...>]

Hi Craig and Mike

The 18FxxK22 controllers are good choice, because they have several nice features. (2UARTS, 64MHz, lot of timers ...)
If you want to use them, you have to modify the ff18_usb.asm file. The main problem with the using uart, the RX enable incompatibility. These controllers use ansela, anselb, anselc, anseld instead of ansel, anselh. The new RX enable routine:
; RX enable
#ifdef ANSELH
#ifdef ANS11
		bcf		ANSELH, ANS11, A ; Enable digital RB5 for RX  
#endif
#endif

#ifdef ANSELC
#ifdef ANSC7
		BANKSEL		ANSELC
		bcf		ANSELC, ANSC7, BANKED   ; Enable digital RC7 for RX
#endif
#endif

        movlw   b'10010000'
        movwf   RCSTA, A
        bsf     PIE1, RCIE, A

You must use banked addressing, because anselc is out of range access bank!

These controllers can run 64MHz with internal oscillator with PLL, but using this feature need a modification in FF. That's why the PLL enable in config bits is uneffective for the internal oscillator.

#ifdef OSCCON
        movlw   0x70            ; Use full internal OSC frequency
        movwf   OSCCON, A
#endif
#ifdef PLL_EN			; Activate PLL
	movlw   0x40            
        movwf   OSCTUNE, A
#endif

To activate it, place the next line in 18f-main.cfg :

#define PLL_EN	\ Activate PLL from SW

I suggest to build this modifications in the FF.

BR
Attila Herman