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max array size PIC18F4620

 
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The Puma



Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands

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max array size PIC18F4620
PostPosted: Sat May 13, 2006 9:41 am     Reply with quote
i have this array.
It displayed the characters correct to the fontdata of the "S"
Thereafter there is only junk
Can this be a problem with the array size?




Code:

// Declare and Init the font array data
char Font[96][5] = {
   0x00, 0x00, 0x00, 0x00, 0x00,  // 0x20, Space
   0x00, 0x00, 0x5F, 0x00, 0x00,  // 0x21, !
   0x00, 0x07, 0x00, 0x07, 0x00,  // 0x22, "
   0x14, 0x7F, 0x14, 0x7F, 0x14,  // 0x23, #
   0x24, 0x2A, 0x7F, 0x2A, 0x12,  // 0x24, $
   0x23, 0x13, 0x08, 0x64, 0x62,  // 0x25, %
   0x36, 0x49, 0x55, 0x22, 0x50,  // 0x26, &
   0x00, 0x05, 0x03, 0x00, 0x00,  // 0x27, '
   0x00, 0x1C, 0x22, 0x41, 0x00,  // 0x28, (
   0x00, 0x41, 0x22, 0x1C, 0x00,  // 0x29, )
   0x08, 0x2A, 0x1C, 0x2A, 0x08,  // 0x2a, *
   0x08, 0x08, 0x3E, 0x08, 0x08,  // 0x2b, +
   0x00, 0x50, 0x30, 0x00, 0x00,  // 0x2c, ,
   0x08, 0x08, 0x08, 0x08, 0x08,  // 0x2d, -
   0x00, 0x60, 0x60, 0x00, 0x00,  // 0x2e, .
   0x20, 0x10, 0x08, 0x04, 0x02,  // 0x2f, /
   0x3E, 0x51, 0x49, 0x45, 0x3E,  // 0x30, 0
   0x00, 0x42, 0x7F, 0x40, 0x00,  // 0x31, 1
   0x42, 0x61, 0x51, 0x49, 0x46,  // 0x32, 2
   0x21, 0x41, 0x45, 0x4B, 0x31,  // 0x33, 3
   0x18, 0x14, 0x12, 0x7F, 0x10,  // 0x34, 4
   0x27, 0x45, 0x45, 0x45, 0x39,  // 0x35, 5
   0x3C, 0x4A, 0x49, 0x49, 0x30,  // 0x36, 6
   0x01, 0x71, 0x09, 0x05, 0x03,  // 0x37, 7
   0x36, 0x49, 0x49, 0x49, 0x36,  // 0x38, 8
   0x06, 0x49, 0x49, 0x29, 0x1E,  // 0x39, 9
   0x00, 0x36, 0x36, 0x00, 0x00,  // 0x3a, :
   0x00, 0x56, 0x36, 0x00, 0x00,  // 0x3b, ;
   0x00, 0x08, 0x14, 0x22, 0x41,  // 0x3c, <
   0x14, 0x14, 0x14, 0x14, 0x14,  // 0x3d, =
   0x41, 0x22, 0x14, 0x08, 0x00,  // 0x3e, >
   0x02, 0x01, 0x51, 0x09, 0x06,  // 0x3f, ?
   0x32, 0x49, 0x79, 0x41, 0x3E,  // 0x40, @
   0x7E, 0x11, 0x11, 0x11, 0x7E,  // 0x41, A
   0x7F, 0x49, 0x49, 0x49, 0x36,  // 0x42, B
   0x3E, 0x41, 0x41, 0x41, 0x22,  // 0x43, C
   0x7F, 0x41, 0x41, 0x22, 0x1C,  // 0x44, D
   0x7F, 0x49, 0x49, 0x49, 0x41,  // 0x45, E
   0x7F, 0x09, 0x09, 0x01, 0x01,  // 0x46, F
   0x3E, 0x41, 0x41, 0x51, 0x32,  // 0x37, G
   0x7F, 0x08, 0x08, 0x08, 0x7F,  // 0x48, H
   0x00, 0x41, 0x7F, 0x41, 0x00,  // 0x49, I
   0x20, 0x40, 0x41, 0x3F, 0x01,  // 0x4a, J
   0x7F, 0x08, 0x14, 0x22, 0x41,  // 0x4b, K
   0x7F, 0x40, 0x40, 0x40, 0x40,  // 0x4c, L
   0x7F, 0x02, 0x04, 0x02, 0x7F,  // 0x4d, M
   0x7F, 0x04, 0x08, 0x10, 0x7F,  // 0x4e, N
   0x3E, 0x41, 0x41, 0x41, 0x3E,  // 0x4f, O
   0x7F, 0x09, 0x09, 0x09, 0x06,  // 0x50, P
   0x3E, 0x41, 0x51, 0x21, 0x5E,  // 0x51, Q
   0x7F, 0x09, 0x19, 0x29, 0x46,  // 0x52, R
   0x46, 0x49, 0x49, 0x49, 0x31,  // 0x53, S
   0x01, 0x01, 0x7F, 0x01, 0x01,  // 0x54, T
   0x3F, 0x40, 0x40, 0x40, 0x3F,  // 0x55, U
   0x1F, 0x20, 0x40, 0x20, 0x1F,  // 0x56, V
   0x7F, 0x20, 0x18, 0x20, 0x7F,  // 0x57, W
   0x63, 0x14, 0x08, 0x14, 0x63,  // 0x58, X
   0x03, 0x04, 0x78, 0x04, 0x03,  // 0x59, Y
   0x61, 0x51, 0x49, 0x45, 0x43,  // 0x5a, Z
   0x00, 0x00, 0x7F, 0x41, 0x41,  // 0x5b, [
   0x02, 0x04, 0x08, 0x10, 0x20,  // 0x5c, \
   0x41, 0x41, 0x7F, 0x00, 0x00,  // 0x5d, ]
   0x04, 0x02, 0x01, 0x02, 0x04,  // 0x5e, ^
   0x40, 0x40, 0x40, 0x40, 0x40,  // 0x5f, _
   0x00, 0x01, 0x02, 0x04, 0x00,  // 0x60, `
   0x20, 0x54, 0x54, 0x54, 0x78,  // 0x61, a
   0x7F, 0x48, 0x44, 0x44, 0x38,  // 0x62, b
   0x38, 0x44, 0x44, 0x44, 0x20,  // 0x63, c
   0x38, 0x44, 0x44, 0x48, 0x7F,  // 0x64, d
   0x38, 0x54, 0x54, 0x54, 0x18,  // 0x65, e
   0x08, 0x7E, 0x09, 0x01, 0x02,  // 0x66, f
   0x08, 0x14, 0x54, 0x54, 0x3C,  // 0x67, g
   0x7F, 0x08, 0x04, 0x04, 0x78,  // 0x68, h
   0x00, 0x44, 0x7D, 0x40, 0x00,  // 0x69, i
   0x20, 0x40, 0x44, 0x3D, 0x00,  // 0x6a, j
   0x00, 0x7F, 0x10, 0x28, 0x44,  // 0x6b, k
   0x00, 0x41, 0x7F, 0x40, 0x00,  // 0x6c, l
   0x7C, 0x04, 0x18, 0x04, 0x78,  // 0x6d, m
   0x7C, 0x08, 0x04, 0x04, 0x78,  // 0x6e, n
   0x38, 0x44, 0x44, 0x44, 0x38,  // 0x6f, o
   0x7C, 0x14, 0x14, 0x14, 0x08,  // 0x70, p
   0x08, 0x14, 0x14, 0x18, 0x7C,  // 0x71, q
   0x7C, 0x08, 0x04, 0x04, 0x08,  // 0x72, r
   0x48, 0x54, 0x54, 0x54, 0x20,  // 0x73, s
   0x04, 0x3F, 0x44, 0x40, 0x20,  // 0x74, t
   0x3C, 0x40, 0x40, 0x20, 0x7C,  // 0x75, u
   0x1C, 0x20, 0x40, 0x20, 0x1C,  // 0x76, v
   0x3C, 0x40, 0x30, 0x40, 0x3C,  // 0x77, w
   0x44, 0x28, 0x10, 0x28, 0x44,  // 0x78, x
   0x0C, 0x50, 0x50, 0x50, 0x3C,  // 0x79, y
   0x44, 0x64, 0x54, 0x4C, 0x44,  // 0x7a, z
   0x00, 0x08, 0x36, 0x41, 0x00,  // 0x7b, {
   0x00, 0x00, 0x7F, 0x00, 0x00,  // 0x7c, |
   0x00, 0x41, 0x36, 0x08, 0x00,  // 0x7d, }
   0x08, 0x08, 0x2A, 0x1C, 0x08,  // 0x7e, ~
   0x08, 0x1C, 0x2A, 0x08, 0x08   // 0x7f, DEL
};


And this is the routine to fill a string with fontdata
Code:

char *message,*text;

void max7221_fill_buffer(char *buffer) {
   int txtptr;
   int messptr=0;
   
   memset(message,0x00,50);
   for(txtptr=0;buffer[txtptr];txtptr++) {
      strncopy(message+messptr,font+((buffer[txtptr]-0x60)*5),5);
      message[messptr+5]=0;
      messptr+=5;
   }
}
JBM



Joined: 12 May 2004
Posts: 54
Location: edinburgh, Scotland

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PostPosted: Sat May 13, 2006 11:13 am     Reply with quote
Just a hunch-

There isn't a problem with the amount of RAM to store the array in, but looks like it's to do with how you're addressing it:
in CCS, an int = int8 = 8 bits, with a maximum of 256
this would tally with the 'S', as it's about 256 characters in to your array.

try changing your ints to int16's and see what happens.

-JBM
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