**BUT** all is not swell! It gets further, but no cigar!

Just need to get onto the forums for the MPLAB X folks and mention.. AHEM … 18F26K22 ?!? 3.37 (or newer) please?!

–Doug

Mind you all modern PICs are internally calibrated to within 1% tolerances (internal clock) at the factory before shipping to customer and have some temperature compensation as well built in. This calibration is not able to be re-done, except for fine tuning via OSCTUNE. I’ve made the following changes as well during the port:

tune&=31; // mask off upper bits
OSCTUNE = tune;

to:

tune&=63; // mask off upper bits
OSCTUNE = tune;

I store minor calibrations in EE and read into memory and set the fine tuner (something I do when programming). Usually only -1 or -2 as these devices (2685 and now 26K22) like to run about 1/2% faster than they should… (mind you an error of 4% and you’ll STILL have taggers joining and debriefing fine — just me being picky).

–Doug

Analog disable is a little different on the K22 series, instead of:

// no analog
ADCON1=255; // all analog input disabled
// Vref internal only
ADCON1bits.VCFG0=0;
ADCON1bits.VCFG1=0;

changed to:

// no analog
ANSELA=0;
ANSELB=0;
ANSELC=0;
ADCON1=0;
ADCON0bits.ADON=0;

and then every place where I has xxxxUSART (like OpenUSART) I simple changed to xxxx1USART !!

Also the clock required slight changing, from:

OSCCONbits.IRCF0=1;

to:

OSCCONbits.IRCF0=0; // this was 1 on 8Mhz device.. now 0 on 16Mhz device

Core differences between the two models

1. 2685 has more memory 96KB  / 26K22 has 64KB (but using about 7.5KB)
2. 2685 has CAN (high speed network often found in newer cars) 26K22 doesn’t — development MCUs tend to have more extras than final production MCUs
3. 2685 has one UART and one MSSP / 26K22 has two UARTS (serial ports) and two MSSP (for SPI or I2C) — a bonus but not used in THIS project (future ones will use two SPI devices)
4. 2685 MAX clock is 40MHZ / 26K22 MAX clock is 64MHZ — don’t need the speed, actually turn down the clock to match same speed in dev MCU
5. 2685 has ADC functions  / 26K22 has more ADC functions (including DAC output) — not usable any ADC/DAC
6. 2685 is a bit more costly / 26K22 is about 1/2 the cost per unit

Had to update the MPLAB IDE and C compiler and also discovered a new development platform from Microchip called MPLAB X which is written entirely in Java and Microchip will support this NEW development IDE on OSX and Linux (as well as Windows).

Talk about putting a smile on my face — supposedly converting projects is fairly easy from an MPLAB IDE 8.x project (which is the major version I am using)… Needless to say, I hope I can kiss  my  Windows(tm) VM goodbye soon! Not that I don’t like the IDE, it’s pretty good and step debugging is nice. I hope all that plus MORE is available under MPLAB X.

I am hoping it is more like Eclipse (which has seriously awesome context awareness when writing code, I like Eclipse — which is what I wrote my Linux GUI code in).