MY FIRST scrolling 8X8 LED

HELLOi PICMASTERS Of The UNIVERSE
Yep it's me again, back from North Eastern Utah for another battlestar galaxy imploding adventure in programming.
The good news, I have the whole mutliplexing, DOT matrix stuff all figured out and working.
The other good news, I have a basic scrolling program that does work.
The other......news...I need help creating a lookup table that I can fetch ASCII values out of in an array type format...at least I think that is how I want to do this mission.

Help me O-PIC-E-WAN's your my only help....(sorry it's still early in the morning for me).


HERE IS MY WORKING CODE

Code:

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'****************************************************************
'*  Name    : MY FIRST SCROLLING LED.BAS                        *
'*  Author  : Tyson Earl                                        *
'*  Notice  : Copyright (c) 2008 Ty's Custom Electronics        *
'*          : All Rights Reserved                              *
'*  Date    : 8/13/2008                                        *
'*  Version : 1.0                                              *
'*  Notes  :                                                  *
'*          :                                                  *
'****************************************************************
DEFINE OSC 12

'ADCON1 = 4 'this sets ANO, AN1, AN3 ON
ADCON1 = 7' ALL DIGITAL
TRISB = 0
TRISC = 0
SINK  VAR PORTB 'ROWS
SOURCE VAR PORTC 'COLUMNS
x var byte
y var byte
z var byte
A VAR BYTE
B VAR BYTE
S VAR BYTE
STP VAR BYTE
CHAR var byte[8]

SOURCEA VAR WORD
SOURCEB VAR WORD
SOURCEC VAR WORD
SOURCED VAR WORD
SOURCEE VAR WORD
SOURCEF VAR WORD
SOURCEG VAR WORD
SOURCEH VAR WORD

COL1 VAR PORTB.0  'COLUMS ARE COMMON CATHODE, DO ALL THE SINKIN'
COL2 VAR PORTB.1
COL3 VAR PORTB.2
COL4 VAR PORTB.3
COL5 VAR PORTB.4
COL6 VAR PORTB.5
COL7 VAR PORTB.6
COL8 VAR PORTB.7
ROW1 VAR PORTC.0  'ROWS ARE THE INDIVIDUAL ANODES, DO ALL THE SOURCIN'
ROW2 VAR PORTC.1
ROW3 VAR PORTC.2
ROW4 VAR PORTC.3
ROW5 VAR PORTC.4
ROW6 VAR PORTC.5
ROW7 VAR PORTC.6
ROW8 VAR PORTC.7

HIGH SINK      'TURN OFF DOT MATRIX, NO SINKING CURRENT
LOW  SOURCE    'NO SOURCED CURRENT

MAIN:

'********************************
'HAPPY FACE APPEARS ON DOT MATRIX
'********************************
FOR z = 0 TO 200        'MULTIPLEX (SCAN) SCREEN 201 TIMES
PAUSE 1
PORTB  = %11111110
SOURCEA = %00111100
PORTC = SOURCEA
PAUSE 1
PORTB  = %11111101
SOURCEB = %01101110
PORTC = SOURCEB
PAUSE 1
PORTB  = %11111011
SOURCEC = %11011011
PORTC = SOURCEC
PAUSE 1
PORTB  = %11110111
SOURCED = %10111111
PORTC = SOURCED
PAUSE 1
PORTB  = %11101111
SOURCEE = %10111111
PORTC = SOURCEE
PAUSE 1
PORTB  = %11011111
SOURCEF = %11011011
PORTC = SOURCEF
PAUSE 1
PORTB  = %10111111
SOURCEG = %01101110
PORTC = SOURCEG
PAUSE 1
PORTB  = %01111111
SOURCEH = %00111100
PORTC = SOURCEH
NEXT z

'****************************************
'SMILEY FACE SHIFTS QUICKLY ACROSS SCREEN
'****************************************

FOR STP = 0 TO 7          'SCROLL MR. SMILEY OFF SCREEN
    FOR S = 0 TO 20        'SCAN SCREEN 21 TIMES (FAST) BETWEEN SCROLLING
        PAUSE 1
        PORTB = %11111110
        PORTC = SOURCEA >>STP
        PAUSE 1
        PORTB = %11111101
        PORTC = SOURCEB >>STP
        PAUSE 1
        PORTB = %11111011
        PORTC = SOURCEC >>STP
        PAUSE 1
        PORTB = %11110111
        PORTC = SOURCED >>STP
        PAUSE 1
        PORTB = %11101111
        PORTC = SOURCEE >>STP
        PAUSE 1
        PORTB = %11011111
        PORTC = SOURCEF >>STP
        PAUSE 1
        PORTB = %10111111
        PORTC = SOURCEG >>STP
        PAUSE 1
        PORTB = %01111111
        PORTC = SOURCEH >>STP
    NEXT S
NEXT STP
GOTO MAIN

---

HERE IS MY OTHER MAIN PROGRAM THAT DOES NOT WORK

Code:

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'IN MAIN2 I WANT TO BE ABLE TO ENTER A "PARSED" STRING/SENTENCE TO THE SCREEN
'THE IDEA BEING THAT YOU CAN ENTER IN "I DID IT!" AND THE 8X8 DOT MATRIX WILL
'SCROLL ...I DID IT! FAST ACROSS SCREEN

MAIN2:                          'NOT WORKING OBVIOUSLY
FOR CHAR = "A","B","C","D","E")  'LOOKUP ASCII DECIMAL VALUE BY STEP/SHIFT????
    FOR STP = 0 TO 8            'SCROLL CHARACTER OFF PAGE NOT SURE HOW TO IMPLEMENT
        FOR S = 0 TO 20          'MULTIPLEX SCREEN PAUSING ~10ms EACH SCAN
                  GoSub display                'FETCH THE 8 ROWS
        NEXT S
    NEXT STP
NEXT CHAR               

GOTO MAIN2

'LETS ASSUME THAT THE DECIMAL VALUES FOR A~E WHERE ACTUALLY 0,1,2,3,4
'IN THIS LOOKUP TABLE I WANT TO FETCH ALL 8 ROWS THAT MAKE UP ASCII CHARACTER
'EVENTUALLY I WILL NEED TO HAVE FULL ASCII TABLE BUILT TO LOOKUP (IN TO)
display:            'A  'B  'C  'D  'E 
        Lookup CHAR[0], [$3F, $06, $5B, $4F, $66], PORTC
        PORTB = %11111110
        PAUSE 1
        Lookup CHAR[1], [$3F, $06, $5B, $4F, $66], PORTC
        PORTB = %11111101
        PAUSE 1
        Lookup CHAR[2], [$3F, $06, $5B, $4F, $66], PORTC
        PORTB = %11111011
        PAUSE 1
        Lookup CHAR[3], [$3F, $06, $5B, $4F, $66], PORTC
        PORTB = %11111011
        PAUSE 1
        Lookup CHAR[4], [$3F, $06, $5B, $4F, $66], PORTC
        PORTB = %11101111
        PAUSE 1
        Lookup CHAR[5], [$3F, $06, $5B, $4F, $66], PORTC
        PORTB = %11011111
        PAUSE 1
        Lookup CHAR[6], [$3F, $06, $5B, $4F, $66], PORTC
        PORTB = %10111111
        PAUSE 1
        Lookup CHAR[7], [$3F, $06, $5B, $4F, $66], PORTC
        PORTB = %01111111
        PAUSE 1
RETURN

---

OBVIOUSLY you cannot count your way through a STING, and also probably obviously I have not idea what I am doing with the arrays either. I think by looking at my working program you will see where I am heading with MAIN2: and be able to offer some ideas that might get me back on track. I have tried to comment our all my ideas.

Thanks for any help you can lend.
May the force be with you!

http://www.picbasic.co.uk/forum/show...ght=copystring
Simple macro to copy a string from the mainline of code into a byte array of STRING.
Then you can dribble thru that byte array, pull out whatever you need...

And if you do a search for 'printstr' (or in my case printstr2), you'll find another macro that is actually set up for either an LCD or the serial port but could be easily modified to drive 8x8 LEDs...which for all practical purposes are just like a graphic LCD as far as showing items.

Take a look at them. If you've never messed with macro's, this is a perfect place to try them out and get to know them...
Obviously, you can most likely do this without the macro's and just use lookup tables and such. I think you'll be much happier with the copystring/printstr/tables-in-flash concept.

Skimask,
I will do some looking into the macro coding,
Looks like it does the job, can you show me where I would insert my string of characters?

I would really like to use lookup tables for this project as I have a grasp on them.
Right now I am just really stumped on how to use arrays with lookup tables to get a full 8x8 matrice of values to the screen one column at a time...???? then of coarse how to shift that entire matrice left or right while fetching the next array to feed into the screen.

Quote:

---

Originally Posted by earltyso

Skimask,
I will do some looking into the macro coding,
Looks like it does the job, can you show me where I would insert my string of characters?

I would really like to use lookup tables for this project as I have a grasp on them.
Right now I am just really stumped on how to use arrays with lookup tables to get a full 8x8 matrice of values to the screen one column at a time...???? then of coarse how to shift that entire matrice left or right while fetching the next array to feed into the screen.

---

If the PIC you're using has internal eeprom, put the table there (the table is actually a matrix of what each character will look like when displayed on the LEDs, almost like what you've got in your first post). In fact, for testing, you could probably use the tables that are already in some of that code (5x7 font) and expand them later on. If the PIC doesn't have internal eeprom, you could still put the table into the code space (search 'making code space your playground').

Shifting - tables - Rather than trying to figure out how to shift an entire column or whatever, I think you have to worry more about getting the thing to work in the first place just displaying single characters at will. Once that's finished, the code for shifting one column at a time should fall into place.

Just as a for instance, say you want to display an O ( a big square O because it's easy) on an 8x8 LED. First byte (first column) is $ff, all 1's, 2nd-7th byte (columns) are %10000001 ($81), top and bottom LEDs on, last byte (column) is just like the first.
When you display a character, you give it a code, such as using ASCII as I did (just not all of it). A big, capital O is ASCII value $4F (79 decimal).
So now, say you've got a table already setup with all of the values plugged in. There's 127 ASCII characters (ok, not all of them displayable according to the ASCII standard, but you can use those non-displayable characters for 'special' characters).
127 characters times 8 columns for each = 1,016 bytes total, call it 1K.
You want to display character 'O', as in capital O. The ASCII value is $4F, so your loop would start at offset $4F times the number of bytes for each character (8), $4F x 8 = $278 (632 decimal), and run for 7 additional columns past that, for 8 columns total. After each read from memory for the byte values, you put that out to the LED matrix.

If you get that working, it'll be a piece of cake to figure out how to do scrolling...

I like the idea of storing the table to eeprom.
Here is what I have come up with. So far I have built up A,B,C,D in my library and they are scrolling just fine by shifting 8 times to the left. Now what I want to do is have the letters scroll TOGETHER so that the letters merge into a sentence without 8 columns of dead space between letters.
I will be trying to figure this out over the weekend. I still need to optimize my table but at its a start.

Code:

---

DEFINE OSC 12

'ADCON1 = 4 'this sets ANO, AN1, AN3 ON
ADCON1 = 7' ALL DIGITAL
TRISB = 0
TRISC = 0
SINK  VAR PORTB 'ROWS
SOURCE VAR PORTC 'COLUMNS
x var byte
y var byte
z var byte
A VAR BYTE
B VAR BYTE
S VAR BYTE
STP VAR BYTE
'CHAR var byte[8]

SOURCEA VAR WORD
SOURCEB VAR WORD
SOURCEC VAR WORD
SOURCED VAR WORD
SOURCEE VAR WORD
SOURCEF VAR WORD
SOURCEG VAR WORD
SOURCEH VAR WORD

LETTERS VAR BYTE ' VARIABLE TO HOLD CHARACTERS IN F/N LOOP
CHAR var byte[26]' ARRAY VARIABLE NAMED CHAR 26 ELEMENTS

'* * * * * * LOAD ARRAY WITH STRING VALUE * * * * * * * * * * *

CHAR[0]= "A"
CHAR[1]= "B"
CHAR[2]= "C"
CHAR[3]= "D"
CHAR[4]= "E"
CHAR[5]= "F"
CHAR[6]= "G"
CHAR[7]= "H"
CHAR[8]= "I"
CHAR[9]= "J"
CHAR[10]="K"
CHAR[11]="L"
CHAR[12]="M"
CHAR[13]="N"
CHAR[14]="O"
CHAR[15]="P"
CHAR[16]="Q"
CHAR[17]="R"
CHAR[18]="S"
CHAR[19]="T"
CHAR[20]="U"
CHAR[21]="V"
CHAR[22]="W"
CHAR[23]="X"
CHAR[24]="Y"
CHAR[25]="Z"

MAIN2:
for x = 0 to 10
lookup x, [0,1,2,3,3,3,2,2,1,1,0], LETTERS      'EQUIVALENT TO a,b,c,d,d,d,c,c,b,b,a
                                    'NOT WORKING OBVIOUSLY
'FOR LETTERS = 0 TO 2              'LOOKUP ASCII CHARACTERS STORED IN MATRICE ARRAY ,A,B,C
    'FOR STP = 0 TO 1              'SCROLL CHARACTER OFF PAGE NOT SURE HOW TO IMPLEMENT
        'FOR S = 0 TO 1            'MULTIPLEX SCREEN PAUSING ~10ms EACH SCAN
                  GoSub display                    'FETCH THE 8 ROWS
        'NEXT S
    'NEXT STP
   
NEXT X               
GOTO MAIN2

display:            'A  'B  'C  'D  'E 
        Lookup LETTERS, [$0, $0, $0, $0], SOURCEA
        PORTC = SOURCEA
        PORTB = %11111110
        PAUSE 1
        Lookup LETTERS, [%01000010, %01111110, %01111110,%01111110], SOURCEB
        PORTC = SOURCEB
        PORTB = %11111101
        PAUSE 1
        Lookup LETTERS, [%01000010, %01000010, %00000010,%01000010], SOURCEC
        PORTC = SOURCEC
        PORTB = %11111011
        PAUSE 1
        Lookup LETTERS, [%01111110,%01000010 , %00000010,%01000010], SOURCED
        PORTC = SOURCED
        PORTB = %11110111
        PAUSE 1
        Lookup LETTERS, [%01000010, %01000110, %00100010,%01100010], SOURCEE
        PORTC = SOURCEE
        PORTB = %11101111
        PAUSE 1                   
        Lookup LETTERS, [%00111100, %00111010, %00111100,%01011100], SOURCEF
        PORTC = SOURCEF
        PORTB = %11011111
        PAUSE 1
        Lookup LETTERS, [$0, %00000010, $0,%01000000], SOURCEG
        PORTC = SOURCEG
        PORTB = %10111111
        PAUSE 1
        Lookup LETTERS, [$0, %00000010, $0,%01000000], SOURCEH
        PORTC = SOURCEH
        PORTB = %01111111
        PAUSE 1
       
FOR STP = 0 TO 7          'SCROLL MR. SMILEY OFF SCREEN
    FOR S = 0 TO 15        'SCAN SCREEN 21 TIMES (FAST) BETWEEN SCROLLING
        PAUSE 1
        PORTB = %11111110
        PORTC = SOURCEA >>STP
        PAUSE 1
        PORTB = %11111101
        PORTC = SOURCEB >>STP
        PAUSE 1
        PORTB = %11111011
        PORTC = SOURCEC >>STP
        PAUSE 1
        PORTB = %11110111
        PORTC = SOURCED >>STP
        PAUSE 1
        PORTB = %11101111
        PORTC = SOURCEE >>STP
        PAUSE 1
        PORTB = %11011111
        PORTC = SOURCEF >>STP
        PAUSE 1
        PORTB = %10111111
        PORTC = SOURCEG >>STP
        PAUSE 1
        PORTB = %01111111
        PORTC = SOURCEH >>STP
    NEXT S
NEXT STP
'GOTO MAIN
       
RETURN

---

Instead of this:

Code:

---

'* * * * * * LOAD ARRAY WITH STRING VALUE * * * * * * * * * * *
CHAR[0]= "A"
CHAR[1]= "B"
CHAR[2]= "C"
CHAR[3]= "D"
CHAR[4]= "E"
CHAR[5]= "F"
CHAR[6]= "G"
CHAR[7]= "H"
CHAR[8]= "I"
CHAR[9]= "J"
CHAR[10]="K"
CHAR[11]="L"
CHAR[12]="M"
CHAR[13]="N"
CHAR[14]="O"
CHAR[15]="P"
CHAR[16]="Q"
CHAR[17]="R"
CHAR[18]="S"
CHAR[19]="T"
CHAR[20]="U"
CHAR[21]="V"
CHAR[22]="W"
CHAR[23]="X"
CHAR[24]="Y"
CHAR[25]="Z"

---

Try this:

Code:

---

For temp = "A" to "Z" : CHAR[ temp - "A" ] = temp : Next temp

---

Easier to type, uses less memory, and so on...

Another idea for you...

Put the complete message into an array of bytes, the whole message, columns and all, not just the ASCII representation of each character (i.e. each character will use up 8 bytes in the array).
Then, when displaying the message, (is the matrix actually 8x8? or are there really more 8x8 chunks involved?), shift the array by one column, pause, redisplay it...

Quote:

---

Originally Posted by skimask

Instead of this:

Code:

---

'* * * * * * LOAD ARRAY WITH STRING VALUE * * * * * * * * * * *
CHAR[0]= "A"
CHAR[1]= "B"
CHAR[2]= "C"
CHAR[3]= "D"
CHAR[4]= "E"
CHAR[5]= "F"
CHAR[6]= "G"
CHAR[7]= "H"
CHAR[8]= "I"
CHAR[9]= "J"
CHAR[10]="K"
CHAR[11]="L"
CHAR[12]="M"
CHAR[13]="N"
CHAR[14]="O"
CHAR[15]="P"
CHAR[16]="Q"
CHAR[17]="R"
CHAR[18]="S"
CHAR[19]="T"
CHAR[20]="U"
CHAR[21]="V"
CHAR[22]="W"
CHAR[23]="X"
CHAR[24]="Y"
CHAR[25]="Z"

---

Try this:

Code:

---

For temp = "A" to "Z" : CHAR[ temp ] = temp : Next temp

---

Easier to type, uses less memory, and so on...

Another idea for you...

Put the complete message into an array of bytes, the whole message, columns and all, not just the ASCII representation of each character (i.e. each character will use up 8 bytes in the array).
Then, when displaying the message, (is the matrix actually 8x8? or are there really more 8x8 chunks involved?), shift the array by one column, pause, redisplay it...

---

Ski,


About the array loop and indexing it;

When Temp = "A", how will "CHAR[ temp ] = temp" work?

Where will "A" go? CHAR[65] ?


What about CHAR[Temp-65] = Temp ?


---------------------

Note: I just realized that my edit updated after Ski posted!

Quote:

---

Originally Posted by sayzer

Ski,

About the array loop and indexing it;

When Temp = "A", how will "CHAR[ temp ] = temp" work?

Where will "A" go?
CHAR[65] ?

Nothing personal, just want to know :)

---

DOH!!!
Char[ temp - "A" ]
That should be a bit better, ya think?

Note: I just saw that Sayzer had edited after I had posted :D