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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| How to convert a string and set 5 bytes to an array |
 Posted: Tue May 09, 2006 12:42 pm |
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I have following segment data array (char Font[])
If i have a string with let say Input_string = "TESTING"
then the corresponding 5 bytes must be placed in an new string
This string has 50 bytes (Output_string[50])
The first bytes must be filled with 0x01, 0x01, 0x7F, 0x01, 0x01
= Char T
The next bytes must filled with 0x7F, 0x49, 0x49, 0x49, 0x41
= Char E
and so on
How can i made that
Please give me a source code
| Code: |
// Declare and Init the font array data
char Font[] = {
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
};
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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Posted: Tue May 09, 2006 3:17 pm |
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If i have only 5 data packets write to the string, the problem is that there are byte filled with crap
How can i fill the unused with 0x00? |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Tue May 09, 2006 4:04 pm |
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| I don't have time to give you a complete example program, but let me suggest you to study the chapter on multi dimensional arrays in your C language book. |
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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Posted: Thu May 11, 2006 2:16 pm |
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This is my code so far.
But i have a problem
If have will display the letters "ABCDEFGHIJK"
then dot matrix for the I remains blank
Is there an error in the
void max7221_fill_buffer(char *buffer) routine
Please HELP
| Code: |
#ifndef MAX7221_CS
#define MAX7221_CS PIN_C0
#define MAX7221_CLK PIN_C3
#define MAX7221_DIN PIN_C5
#endif
// Register address map
#define NO_OP 0x00 // Used when cascading max7221s
#define DIGIT_0 0x01 // Digit 0 register
#define DIGIT_1 0x02 // Digit 1 register
#define DIGIT_2 0x03 // Digit 2 register
#define DIGIT_3 0x04 // Digit 3 register
#define DIGIT_4 0x05 // Digit 4 register
#define DIGIT_5 0x06 // Digit 5 register
#define DIGIT_6 0x07 // Digit 6 register
#define DIGIT_7 0x08 // Digit 7 register
#define DECODE_MODE 0x09 // Decode mode register
#define INTENSITY 0x0A // Intensity register
#define SCAN_LIMIT 0x0B // Scan-limit register
#define SHUT_DOWN 0x0C // Shutdown register
#define DISPLAY_TEST 0x0F // Display-test register
// Shutdown register
#define SHUTDOWN_MODE 0x00 // Shutdown mode
#define NORMAL_MODE 0x01 // Normal mode
// Decode-mode register
#define NO_DECODE_DIGITS_7_0 0x00 // No decode for digits 7-0
#define CODE_B_DECODE_DIGIT_0 0x01 // Code B decode for digit 0
#define CODE_B_DECODE_DIGITS_3_0 0x0F // Code B decode for digits 3-0
#define CODE_B_DECODE_DIGITS_7_0 0xFF // Code B decode for digits 7-0
// Intensity register
#define DUTY_CYCLE_1 0x00 // Intensity min
#define DUTY_CYCLE_2 0x01
#define DUTY_CYCLE_3 0x02
#define DUTY_CYCLE_4 0x03
#define DUTY_CYCLE_5 0x04
#define DUTY_CYCLE_6 0x05
#define DUTY_CYCLE_7 0x06
#define DUTY_CYCLE_8 0x07
#define DUTY_CYCLE_9 0x08
#define DUTY_CYCLE_10 0x09
#define DUTY_CYCLE_11 0x0A
#define DUTY_CYCLE_12 0x0B
#define DUTY_CYCLE_13 0x0C
#define DUTY_CYCLE_14 0x0D
#define DUTY_CYCLE_15 0x0E
#define DUTY_CYCLE_16 0x0F // Intensity full
// Scan-limit register
#define DISPLAY_DIGIT_0 0x00 // Display digit 0
#define DISPLAY_DIGITS_01 0x01 // Display digits 0 & 1
#define DISPLAY_DIGITS_012 0x02 // Display digits 0 1 2
#define DISPLAY_DIGITS_0123 0x03 // Display digits 0 1 2 3
#define DISPLAY_DIGITS_01234 0x04 // Display digits 0 1 2 3 4
#define DISPLAY_DIGITS_012345 0x05 // Display digits 0 1 2 3 4 5
#define DISPLAY_DIGITS_0123456 0x06 // Display digits 0 1 2 3 4 5 6
#define DISPLAY_DIGITS_01234567 0x07 // Display digits 0 1 2 3 4 5 6 7
// Display-test register
#define NORMAL_OPERATION 0x00 // Normal operation
#define DISPLAY_TEST_MODE 0x01 // Display-test mode, all leds on
// Dot-matrix displays
#define DOT_MATRIX_DISPLAY_LEFT 0x00
#define DOT_MATRIX_DISPLAY_RIGHT 0x09
// Declare and Init the font array data
char Font[] = {
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
};
char message[];
char *text;
int messptr=0;
void max7221_fill_buffer(char *buffer) {
int txtptr;
for(txtptr=0;buffer[txtptr];txtptr++) {
strncpy(message+messptr,font+((buffer[txtptr]-0x20)*5),5);
message[messptr+5]=0;
messptr+=5;
}
while(messptr<50)
message[messptr++]=0;
}
void max7221_display_message() {
int column,matrix,index;
for(column=DIGIT_0;column<=DIGIT_4;column++) {
index=column-1;
output_low(MAX7221_CS);
for(matrix=DOT_MATRIX_DISPLAY_LEFT;matrix<=DOT_MATRIX_DISPLAY_RIGHT;matrix++) {
spi_write(column);
spi_write(message[index]);
index+=5;
}
output_high(MAX7221_CS);
}
}
void max7221_put(int addr,int data) {
int matrix;
output_low(MAX7221_CS);
for(matrix=DOT_MATRIX_DISPLAY_LEFT;matrix<=DOT_MATRIX_DISPLAY_RIGHT;matrix++) {
spi_write(addr);
spi_write(data);
}
output_high(MAX7221_CS);
}
void max7221_clear() {
int column,matrix;
for(column=DIGIT_0;column<=DIGIT_4;column++) {
output_low(MAX7221_CS);
for(matrix=DOT_MATRIX_DISPLAY_LEFT;matrix<=DOT_MATRIX_DISPLAY_RIGHT;matrix++) {
spi_write(column);
spi_write(0x00);
}
output_high(MAX7221_CS);
}
}
void max7221_init() {
max7221_put(DECODE_MODE,NO_DECODE_DIGITS_7_0);
max7221_put(SCAN_LIMIT,DISPLAY_DIGITS_01234);
max7221_put(SHUT_DOWN,NORMAL_MODE);
max7221_put(DISPLAY_TEST,NORMAL_OPERATION);
max7221_put(INTENSITY,DUTY_CYCLE_1);
}
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| Code: |
#include <18F4620.h>
#use delay(clock=20000000)
#fuses HS,NOWDT,NOBROWNOUT,NOPUT,NOLVP,DEBUG,NOSTVREN,NOPROTECT
#include <string.h>
#include <max7221 (5x7 dot matrix).h>
void main() {
setup_spi(SPI_MASTER | SPI_H_TO_L | SPI_CLK_DIV_16);
max7221_init();
max7221_clear();
strcpy(text,"ABCDEFGHIJK");
max7221_fill_buffer(text);
max7221_display_message();
}
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Fri May 12, 2006 3:12 am |
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strncpy() will copy all data until the specified number of characters is reached or a null character (0x00) is found. In your string 'ABCDEFGHIJK', the character 'I' is the first character to contain a 0x00 byte in the 5 bytes to be copied and that is where the copy stops.
Also your variable messptr is now a global and only set to 0 at program startup, after that is never reset to 0 again.
Try the replacement below and tell us the results: | Code: | void max7221_fill_buffer(char *Buffer)
{
char CurrentChar;
char *MsgPtr;
// Clear message
memset(message, 0x00, 50);
// Copy font for each character
MsgPtr = &message[0];
CurrentChar = *Buffer;
while (CurrentChar)
{
memcpy(MsgPtr, font[CurrentChar - 0x20], 5);
MsgPtr += 5;
CurrentChar = *(++Buffer);
}
} |
Another tip: make your font array a constant array by adding the 'const' keyword: | Code: | | const char Font[] = { |
This will save a lot of your program and RAM memory space as it keeps the data in program area instead of copying all the data at program start to RAM also. |
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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Posted: Sat May 20, 2006 6:52 am |
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Ok, this works now, but how can i move the text by one column each from left to right?
@ckielstra
I have sent a mail |
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