12f675_fuse_about_to_blow!

[LEDave]

Hi Henrik,

Yes, NOT GATE or inverted output, here's a Wiki link for any other newbies:

http://en.wikipedia.org/wiki/Inverter_(logic_gate)

Like I said in my post above, it's easy to jump to the wrong conclusions(that's why I appreciate your and mackrackit's help so much)

Speaking of help, I blew the dust of the old LCD and ran a modified program from mackrackits link:

MyVAR VAR BYTE
Mybyte var byte
Mybit VAR bit

LET MyByte = 7

For MyVar = 0 to 7
MyBit = MyByte.0(MyVar)
LCDOut $FE,1,"Bit ",#MyVar,"=",#MyBit
Pause 2000
Next MyVar

When I ran it, Bits 0-1-2 were 1's the rest 0's following the pattern for Bin 7. So onto Bruce's code below:

' Only DAT_OUT bits 1 and 2 are used. We add a few 1's in bit
    ' positions 0,3,5,7 to balance out the data packet being sent.
    DAT_OUT = %10101001
    ' Get data on button inputs & invert 0's to 1's
    DAT_OUT.0[1]=~GPIO.3
    DAT_OUT.0[2]=~GPIO.4
    INTCON.0 = 0  ' Clear int on change flag
      
    ' Build checksum of 2 data bytes
    CHK_SUM = (DAT_OUT * 2)

Well the checksum would be two BYTES of:

DAT_OUT = %10101001

With bits 1 & 2 being 0's (not inverted).....I think.

DAT_OUT = %10101001  DAT_OUT.0[1]=~GPIO.3 DAT_OUT.0[2]=~GPIO.4

Would mean (I think again) bit 1 & 2 would invert to a 1 in the DAT_OUT_BYTE. Or saying that maybe it's only bits 1 & 2 that are inverted and sent. Mm, not sure but I'll go with the first option.

Tin hat on, duck, am I close? (if not, just say so and I'll carry on thinking / reading).

Dave