Help: how to assign assorted pins to one byte variable

[ofuzzy1]

Heckler, bless your heart.
Like I said, it would help if I read a bit better --- should go to bed.

Since your the Teacher then here:

Question: does your suggestions apply to writing out to the pins as well as reading in from the pins
From the same pins? Yes, you would read what you set AND any INPUTs -- all assuming the TRIS[a,b,c] are set properly
If you need to write to other pins and maintain the LEDs then see
"OTHER_PIN_STATES"

Yes, these will write directly to the ports.

Using this order for what you want displayed in a byte
A1,A2,C0,C1,C2,B4,B5,B6

And the final value is stored in the LED_OUT a VAR BYTE

You will need to take care of the TRIS registers.

PortA = (LED_OUT & %00000011) << 1     ' get bits a1, a2 and shift UP 1 to PORTA.1.2
PortC = (LED_OUT & %00011100) >> 2     ' get bits C0,C1,C2 and shift DOWN 2 to PORTC.0.1.2
PortB = (LED_OUT & %11100000) >> 1      ' get bits B4,B5,B6 and shift DOWN 1 to PORTB.4.5.6

"OTHER_PIN_STATES"
If you need to keep other pins 'On or off' then use

 
PortB = OTHER_PIN_STATES + (LED_OUT & %11100000) >> 1

Input would be the the reverse.
Try this for an INPUT
Using this order
A1,A2,C0,C1,C2,B4,B5,B6

KEY_8x8 = ((PortA & $06) >> 1) + ((PortC & $07) << 2) + ((PortB & $70) << 1)
or
KEY_8x8 = (PortA & %00000110) >> + ((PortC & %00000111) << 2) + ((PortB & %01110000)  << 1)

PortA.1.2 are extracted and shifted down one to bits %xxxxxxAA
PortC.0.1.2 are extracted and shifted to up two bits %xxxxBBBxx
PortB.4.5.6 are extracted and shifted to up one bit %CCCxxxxxx


OTHER hints be sure to set the -- I keep forgetting then spending to much time finding that goof.

 

' setup the registers and IO PINS
'— COMPARATOR CONTROL REGISTER -- choose the correct one for your chip :o)
   CMCON = $07  'CMCON — COMPARATOR CONTROL REGISTER  ALL DIGITAL
'or
'   CMCON0 = $07  'ALL DIGITAL 12f683 & chips with a2d — COMPARATOR CONTROL REGISTER
'
'	ADCON1 = %01100000	' Set a2d convert at clk/6 [slowest]
'	ADCON1 = %00000000	' Set a2d convert at clk/2 [fastest]
	ANSEL  = %00000000  ' AN0/RA0 as analog input     1=ANALOG
	ADCON0 = %00000000	' .7=10bits left justify result!! / .0 1=a2d ON

and Pull-up the _MCLR PIN !!!!

[sean-h]

What about this?

YourByte var byte
YourByte=Value you set

portA.1 = YourByte.Bit0
portA.2 = YourByte.Bit1
PortC.0 = YourByte.Bit2
PortC.1 = YourByte.Bit3
PortC.2 = YourByte.Bit4
PortB.4 = YourByte.Bit5
PortB.5 = YourByte.Bit6
PortB.6 = YourByte.Bit7

Cheers

Sean.

[ofuzzy1]

What about this?

YourByte var byte
YourByte=Value you set

portA.1 = YourByte.Bit0
portA.2 = YourByte.Bit1
PortC.0 = YourByte.Bit2
PortC.1 = YourByte.Bit3
PortC.2 = YourByte.Bit4
PortB.4 = YourByte.Bit5
PortB.5 = YourByte.Bit6
PortB.6 = YourByte.Bit7

Cheers

Sean.

Now that was to easy! Dooh!

I was wondering this morning how to do the .bit thing

[Heckler]

I guess the real answer is... NO. There is no way in PBP to define a Variable Aliase that represents the mixed pins of different ports, and then be able to write one word to that aliase and have it go out to the pins. Similar to what you can do with a statement like...

PortC = % 10101010

Comments to each of the posters in order of reply...

@ ofuzzy1: Thanks for your persistance... I figured it may come down to brute force programming and shifting / and-ing of bits to get them all set.

@ sean-h: That looks clean... I wonder if it is any slower or faster than fuzzy's method?

@ rsocor01: Initially I was planning on using "stripboard or veroboard" so I wanted to minimize the wiring and cutting of traces. I may actually end up making a PCB board and if that is the case I'll surely just use Port C that has all 8 bits.

thanks everyone...

This is why I REALLY, REALLY wish that the PBP manual had more "real world" examples. Many of the code syntax definitions are so bare that it is hard to understand the use of them.

I guess if the manual was TOO GOOD there would be no need for a GREAT forum like this one.

The Scout Camp is this July... I will be putting together the project in the next few months and when I get it done I'll come back here and post code and pictures.

Here are a couple of excellent examples I have found:

http://www.instructables.com/id/Mini...-with-built-i/

Watch the youtube video!

http://tinkerlog.com/howto/64pixels/


Others... please post more ideas if you have them