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Need some help with moving message with max7221

 
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The Puma



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

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Need some help with moving message with max7221
PostPosted: Wed Oct 04, 2006 10:21 am     Reply with quote
Hallo,

I open this topic already earler,
but i lose my source file for scrolling the text on the dotmatrix

I have 10 max7221 cascaded together, and each of this max are connected to a 5x7 dot matrix display

With this code on the right 4 dot matrix display the letters "TEST" are print
This is good.

But my question is now, how can i move the text one dot row to left?
Here is the code:

Code:

#include <18F4620.h>
#use delay(clock=20000000)
#fuses HS,NOWDT,NOBROWNOUT,NOPUT,NOLVP,DEBUG,NOSTVREN,NOPROTECT

#include <programmable led scrolling message board.h>

void main() {
   
   setup_spi(SPI_MASTER | SPI_H_TO_L | SPI_CLK_DIV_16);
   
   max7221_init();
   max7221_clear();
   
   strcpy(text,"TSET");
   max7221_fill_buffer(text);
   
   max7221_display_message();
}


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_MIN    0x00
#define DOT_MATRIX_DISPLAY_MAX    0x09

// Declare and Init the font array data
char const font5x7[96][6] = {
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00  // 0x20, Space
   0x00, 0x00, 0x5F, 0x00, 0x00, 0x00  // 0x21, !
   0x00, 0x07, 0x00, 0x07, 0x00, 0x00  // 0x22, "
   0x14, 0x7F, 0x14, 0x7F, 0x14, 0x00  // 0x23, #
   0x12, 0x2A, 0x7F, 0x2A, 0x24, 0x00  // 0x24, $
   0x62, 0x64, 0x08, 0x13, 0x23, 0x00  // 0x25, %
   0x50, 0x22, 0x55, 0x49, 0x36, 0x00  // 0x26, &
   0x00, 0x00, 0x03, 0x05, 0x00, 0x00  // 0x27, '
   0x00, 0x41, 0x22, 0x1C, 0x00, 0x00  // 0x28, (
   0x00, 0x1C, 0x22, 0x41, 0x00, 0x00  // 0x29, )
   0x08, 0x2A, 0x1C, 0x2A, 0x08, 0x00  // 0x2A, *
   0x08, 0x08, 0x3E, 0x08, 0x08, 0x00  // 0x2B, +
   0x00, 0x00, 0x30, 0x50, 0x00, 0x00  // 0x2C, ,
   0x08, 0x08, 0x08, 0x08, 0x08, 0x00  // 0x2D, -
   0x00, 0x00, 0x60, 0x60, 0x00, 0x00  // 0x2E, .
   0x02, 0x04, 0x08, 0x10, 0x20, 0x00  // 0x2F, /
   0x3E, 0x45, 0x49, 0x51, 0x3E, 0x00  // 0x30, 0
   0x00, 0x40, 0x7F, 0x42, 0x00, 0x00  // 0x31, 1
   0x46, 0x49, 0x51, 0x61, 0x42, 0x00  // 0x32, 2
   0x31, 0x4B, 0x45, 0x41, 0x21, 0x00  // 0x33, 3
   0x10, 0x7F, 0x12, 0x14, 0x18, 0x00  // 0x34, 4
   0x39, 0x45, 0x45, 0x45, 0x27, 0x00  // 0x35, 5
   0x30, 0x49, 0x49, 0x4A, 0x3C, 0x00  // 0x36, 6
   0x03, 0x05, 0x09, 0x71, 0x01, 0x00  // 0x37, 7
   0x36, 0x49, 0x49, 0x49, 0x36, 0x00  // 0x38, 8
   0x1E, 0x29, 0x49, 0x49, 0x06, 0x00  // 0x39, 9
   0x00, 0x00, 0x36, 0x36, 0x00, 0x00  // 0x3A, :
   0x00, 0x00, 0x36, 0x56, 0x00, 0x00  // 0x3B, ;
   0x41, 0x22, 0x14, 0x08, 0x00, 0x00  // 0x3C, <0x14>
   0x06, 0x09, 0x51, 0x01, 0x02, 0x00  // 0x3F, ?
   0x3E, 0x41, 0x79, 0x49, 0x32, 0x00  // 0x40, @
   0x7E, 0x11, 0x11, 0x11, 0x7E, 0x00  // 0x41, A
   0x36, 0x49, 0x49, 0x49, 0x7F, 0x00  // 0x42, B
   0x22, 0x41, 0x41, 0x41, 0x3E, 0x00  // 0x43, C
   0x1C, 0x22, 0x41, 0x41, 0x7F, 0x00  // 0x44, D
   0x41, 0x49, 0x49, 0x49, 0x7F, 0x00  // 0x45, E
   0x01, 0x01, 0x09, 0x09, 0x7F, 0x00  // 0x46, F
   0x32, 0x51, 0x41, 0x41, 0x3E, 0x00  // 0x37, G
   0x7F, 0x08, 0x08, 0x08, 0x7F, 0x00  // 0x48, H
   0x00, 0x41, 0x7F, 0x41, 0x00, 0x00  // 0x49, I
   0x01, 0x3F, 0x41, 0x40, 0x20, 0x00  // 0x4A, J
   0x41, 0x22, 0x14, 0x08, 0x7F, 0x00  // 0x4B, K
   0x40, 0x40, 0x40, 0x40, 0x7F, 0x00  // 0x4C, L
   0x7F, 0x02, 0x04, 0x02, 0x7F, 0x00  // 0x4D, M
   0x7F, 0x10, 0x08, 0x04, 0x7F, 0x00  // 0x4E, N
   0x3E, 0x41, 0x41, 0x41, 0x3E, 0x00  // 0x4F, O
   0x06, 0x09, 0x09, 0x09, 0x7F, 0x00  // 0x50, P
   0x5E, 0x21, 0x51, 0x41, 0x3E, 0x00  // 0x51, Q
   0x46, 0x29, 0x19, 0x09, 0x7F, 0x00  // 0x52, R
   0x31, 0x49, 0x49, 0x49, 0x46, 0x00  // 0x53, S
   0x01, 0x01, 0x7F, 0x01, 0x01, 0x00  // 0x54, T
   0x3F, 0x40, 0x40, 0x40, 0x3F, 0x00  // 0x55, U
   0x1F, 0x20, 0x40, 0x20, 0x1F, 0x00  // 0x56, V
   0x7F, 0x20, 0x18, 0x20, 0x7F, 0x00  // 0x57, W
   0x63, 0x14, 0x08, 0x14, 0x63, 0x00  // 0x58, X
   0x03, 0x04, 0x78, 0x04, 0x03, 0x00  // 0x59, Y
   0x43, 0x45, 0x49, 0x51, 0x61, 0x00  // 0x5A, Z
   0x41, 0x41, 0x7F, 0x00, 0x00, 0x00  // 0x5B, [
   0x20, 0x10, 0x08, 0x04, 0x02, 0x00  // 0x5C, \
   0x00, 0x00, 0x7F, 0x41, 0x41, 0x00  // 0x5D, ]
   0x04, 0x02, 0x01, 0x02, 0x04, 0x00  // 0x5E, ^
   0x40, 0x40, 0x40, 0x40, 0x40, 0x00  // 0x5F, _
   0x00, 0x04, 0x02, 0x01, 0x00, 0x00  // 0x60, `
   0x78, 0x54, 0x54, 0x54, 0x20, 0x00  // 0x61, a
   0x38, 0x44, 0x44, 0x48, 0x7F, 0x00  // 0x62, b
   0x20, 0x44, 0x44, 0x44, 0x38, 0x00  // 0x63, c
   0x7F, 0x48, 0x44, 0x44, 0x38, 0x00  // 0x64, d
   0x18, 0x54, 0x54, 0x54, 0x38, 0x00  // 0x65, e
   0x02, 0x01, 0x09, 0x7E, 0x08, 0x00  // 0x66, f
   0x3C, 0x54, 0x54, 0x14, 0x08, 0x00  // 0x67, g
   0x78, 0x04, 0x04, 0x08, 0x7F, 0x00  // 0x68, h
   0x00, 0x40, 0x7D, 0x44, 0x00, 0x00  // 0x69, i
   0x00, 0x3D, 0x44, 0x40, 0x20, 0x00  // 0x6A, j
   0x44, 0x28, 0x10, 0x7F, 0x00, 0x00  // 0x6B, k
   0x00, 0x40, 0x7F, 0x41, 0x00, 0x00  // 0x6C, l
   0x78, 0x04, 0x18, 0x04, 0x7C, 0x00  // 0x6D, m
   0x78, 0x04, 0x04, 0x08, 0x7C, 0x00  // 0x6E, n
   0x38, 0x44, 0x44, 0x44, 0x38, 0x00  // 0x6F, o
   0x08, 0x14, 0x14, 0x14, 0x7C, 0x00  // 0x70, p
   0x7C, 0x18, 0x14, 0x14, 0x08, 0x00  // 0x71, q
   0x08, 0x04, 0x04, 0x08, 0x7C, 0x00  // 0x72, r
   0x20, 0x54, 0x54, 0x54, 0x48, 0x00  // 0x73, s
   0x20, 0x40, 0x44, 0x3F, 0x04, 0x00  // 0x74, t
   0x7C, 0x20, 0x40, 0x40, 0x3C, 0x00  // 0x75, u
   0x1C, 0x20, 0x40, 0x20, 0x1C, 0x00  // 0x76, v
   0x3C, 0x40, 0x30, 0x40, 0x3C, 0x00  // 0x77, w
   0x44, 0x28, 0x10, 0x28, 0x44, 0x00  // 0x78, x
   0x3C, 0x50, 0x50, 0x50, 0x0C, 0x00  // 0x79, y
   0x44, 0x4C, 0x54, 0x64, 0x44, 0x00  // 0x7A, z
   0x00, 0x41, 0x36, 0x08, 0x00, 0x00  // 0x7B, {
   0x00, 0x00, 0x7F, 0x00, 0x00, 0x00  // 0x7C, |
   0x00, 0x08, 0x36, 0x41, 0x00, 0x00  // 0x7D, }
   0x08, 0x1C, 0x2A, 0x08, 0x08, 0x00  // 0x7E, ~
   0x08, 0x08, 0x2A, 0x1C, 0x08, 0x00  // 0x7F, DEL
};

char message[50];
char text[10];

void max7221_fill_buffer(char *buffer) {
   char currentchar;
   char *msgptr;
   
   memset(message,0x00,50);
   
   msgptr=&message[0];
   currentchar=*buffer;
   while(currentchar) {
      memcpy(msgptr,font5x7[currentchar-0x20],5);
      msgptr+=5;
      currentchar=*(++buffer);
   }
}

void max7221_display_message() {
   int column,matrix,index;
   
   for(column=DIGIT_0;column<=DIGIT_4;column++) {
      index=5-column;
      output_low(MAX7221_CS);
      for(matrix=DOT_MATRIX_DISPLAY_MIN;matrix<=DOT_MATRIX_DISPLAY_MAX;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_MIN;matrix<=DOT_MATRIX_DISPLAY_MAX;matrix++) {
      spi_write(addr);
      spi_write(data);
   }
   output_high(MAX7221_CS);
}

void max7221_clear() {
   int column;
   
   for(column=DIGIT_0;column<=DIGIT_4;column++) {
      max7221_put(column,0x00);
   }
}

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_2);
}
yerpa



Joined: 19 Feb 2004
Posts: 58
Location: Wisconsin

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PostPosted: Wed Oct 04, 2006 12:07 pm     Reply with quote
Without testing this code, it looks like you could add a variable to your "max7221_fill_buffer()" routine so that the line "msgptr=&message[0];" could instead be written as "msgptr=&message[new_variable];", where new_variable could increment to scroll the message. You will have to zero-fill your display buffer for locations message[0] thru message[new-variable -1].

Basically, you need to scroll the data in the buffer prior to calling the display routine.

Good Luck!
The Puma



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

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PostPosted: Thu Oct 05, 2006 9:22 am     Reply with quote
Please can someone help me with a sample code to do this ?
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