Max7219 rotation and mirrored help

Other Hardware LEDs and Multiplexing
1

Hello,
just started playing around with an 8x8 matrix a Max7219 and a duino and have run into some problems.
I used the instructions from Arduino Playground to wire it up and it works. Used the test library's and it looks great.
So im still really new to all the coding and such used on the Arduino so I have been playing around with other scripts ive found online.
I used the code from http://arduino.cc/forum/index.php/topic,22305.0.html and after some fiddling I got it running but, its rotated 90 degrees left and its mirrored.....
I tried reversing all the pins on the matrix and that just made it stay lit all the time.
Does anyone have experience with Tomas123's code and could help me out. I made no changes to his code but im not sure where I should be looking..

2

Are you using a common Anode LEd matrix vs a common Cathode matrix?

For letters, you need to turn the fonts over

Display is 5x7 right?
So each letter has 5 bytes representing the row, and th data in that byte represents the LEDs in that column that are high/low.
Draw yourself a picture of each character, and work out how to flip it around.

const uint8_t font[] PROGMEM = {
// 5 chars bitmap, stop bit is bit.7
0x00,0x00,0x00,0x00,0x80, // 0x20, 32, '
0x00,0x30,0x7D,0x30,0x80, // 0x21, 33, !
0x70,0x60,0x00,0x70,0xE0, // 0x22, 34, "
0x12,0x3F,0x12,0x3F,0x92, // 0x23, 35, #
0x12,0x6A,0x2B,0xA4,0x80, // 0x24, 36, $
0x63,0x64,0x08,0x13,0xE3, // 0x25, 37, %
0x36,0x49,0x35,0x02,0x85, // 0x26, 38, &
0x00,0x70,0x60,0x80,0x80, // 0x27, 39, '
0x00,0x3E,0x41,0x80,0x80, // 0x28, 40, (
0x00,0x41,0x3E,0x80,0x80, // 0x29, 41, )
0x08,0x3E,0x1C,0x3E,0x88, // 0x2A, 42, *
0x08,0x08,0x3E,0x08,0x88, // 0x2B, 43, +
0x00,0x03,0x03,0x80,0x80, // 0x2C, 44, ,
0x08,0x08,0x08,0x08,0x88, // 0x2D, 45, -
0x00,0x03,0x03,0x80,0x80, // 0x2E, 46, .
0x02,0x04,0x08,0x10,0xA0, // 0x2F, 47, /
0x3E,0x45,0x49,0x51,0xBE, // 0x30, 48, 0
0x00,0x21,0x7F,0x81,0x80, // 0x31, 49, 1
0x23,0x45,0x49,0x49,0xB1, // 0x32, 50, 2
0x22,0x49,0x49,0x49,0xB6, // 0x33, 51, 3
0xC,0x14,0x24,0x7F,0x84, // 0x34, 52, 4
0x7A,0x49,0x49,0x49,0xC6, // 0x35, 53, 5
0x1E,0x29,0x49,0x49,0x86, // 0x36, 54, 6
0x40,0x47,0x48,0x50,0xE0, // 0x37, 55, 7
0x36,0x49,0x49,0x49,0xB6, // 0x38, 56, 8
0x30,0x49,0x49,0x4A,0xBC, // 0x39, 57, 9
0x00,0x1B,0x1B,0x80,0x80, // 0x3A, 58, :
0x00,0x1B,0x1B,0x80,0x80, // 0x3B, 59, ;
0x08,0x14,0x22,0xC1,0x80, // 0x3C, 60, <
0x12,0x12,0x12,0x12,0x92, // 0x3D, 61, =
0x00,0x41,0x22,0x14,0x88, // 0x3E, 62, >
0x20,0x40,0x4D,0x48,0xB0, // 0x3F, 63, ?
0x3E,0x41,0x5D,0x55,0xBC, // 0x40, 64, @
0x3F,0x44,0x44,0x44,0xBF, // 0x41, 65, A
0x7F,0x49,0x49,0x49,0xB6, // 0x42, 66, B
0x3E,0x41,0x41,0x41,0xA2, // 0x43, 67, C
0x7F,0x41,0x41,0x41,0xBE, // 0x44, 68, D
0x7F,0x49,0x49,0x49,0xC1, // 0x45, 69, E
0x7F,0x48,0x48,0x48,0xC0, // 0x46, 70, F
0x3E,0x41,0x49,0x49,0xAF, // 0x47, 71, G
0x7F,0x08,0x08,0x08,0xFF, // 0x48, 72, H
0x00,0x41,0x7F,0xC1,0x80, // 0x49, 73, I
0x06,0x01,0x01,0x01,0xFE, // 0x4A, 74, J
0x7F,0x08,0x14,0x22,0xC1, // 0x4B, 75, K
0x7F,0x01,0x01,0x01,0x81, // 0x4C, 76, L
0x7F,0x20,0x10,0x20,0xFF, // 0x4D, 77, M
0x7F,0x20,0x10,0x08,0xFF, // 0x4E, 78, N
0x3E,0x41,0x41,0x41,0xBE, // 0x4F, 79, O
0x7F,0x48,0x48,0x48,0xB0, // 0x50, 80, P
0x3E,0x41,0x45,0x42,0xBD, // 0x51, 81, Q
0x7F,0x48,0x48,0x4C,0xB3, // 0x52, 82, R
0x32,0x49,0x49,0x49,0xA6, // 0x53, 83, S
0x40,0x40,0x7F,0x40,0xC0, // 0x54, 84, T
0x7E,0x01,0x01,0x01,0xFE, // 0x55, 85, U
0x7C,0x02,0x01,0x02,0xFC, // 0x56, 86, V
0x7E,0x01,0x1E,0x01,0xFE, // 0x57, 87, W
0x63,0x14,0x08,0x14,0xE3, // 0x58, 88, X
0x70,0x08,0x07,0x08,0xF0, // 0x59, 89, Y
0x47,0x49,0x51,0xE1,0x80, // 0x5A, 90, Z
};

3

Im using a common anode matrix. Its XH-1088BRW.

1023×585 57.2 KB

So after I get the letters De-mirrored how do I get it all turned 90 degrees back. The video I took was from the side the bottom should have been on.

I also found a nice instructable with a tool to make the hex codes with just filling in the matrix in an excel spreadsheet.

4

Head meet brick wall......

/*

  • copy screen_mem[] to LED Matrix 8x8
    /
    void writeArduinoOnMatrix() {
    /     here is the data for the characters /
    int i;
    for (i=0; i<8; i++)
    lc.setColumn(0,i,screen_mem    ); <<<<<<<<<< Changed to setRow and it turned 90 deg and its starts at row 0 instead of column 0 thats at the top and mirrors it.... :roll_eyes:*
    Tomas123's fonts now work also,now i have to figure out why the excel sheet fonts don't work I need to learn to pay more attention its a 5x8 font he has in his excel sheet not 5x7 as the script is made for 0xFF causes an error.... :disappointed_relieved:
    TY CrossRoads if you had not mentioned Anode Vs Cathode id probably still be stumped
    Max7219 Arduino Scrolling text - YouTube