![](/media/cache/profiles/32cfdce9631d8c7906e8e9d6e68b514b.50x50_q85.jpg)
Test program for Adafruit's 32x16 RGB LED matrix. Should look like this: [[https://www.youtube.com/watch?v=YjY66pOaO_M]]
Test program for Adafruit's 32x16 RGB LED matrix. Should look like this: https://www.youtube.com/watch?v=YjY66pOaO_M
main.cpp@0:1f58ecec51d6, 2012-11-19 (annotated)
- Committer:
- RRacer
- Date:
- Mon Nov 19 02:08:11 2012 +0000
- Revision:
- 0:1f58ecec51d6
- Child:
- 1:dd0dcd303d6d
Verified test program for Adafruits 16x32 RGB LED matrix.; http://www.adafruit.com/products/420
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
RRacer | 0:1f58ecec51d6 | 1 | /* |
RRacer | 0:1f58ecec51d6 | 2 | The goal of this program is to show the basic connections and workings of Adafruits 32x16 RGB LED matrix board (http://www.adafruit.com/products/420), |
RRacer | 0:1f58ecec51d6 | 3 | also sold on other places, for instance http://www.ebay.com/itm/PH6-RGB-Full-Color-LED-16-32-Dot-Matrix-Display-Module-/310303408628?pt=LH_DefaultDomain_0&hash=item483f8641f4 (no |
RRacer | 0:1f58ecec51d6 | 4 | affiliation with either of them). |
RRacer | 0:1f58ecec51d6 | 5 | This program is not intended to be highly optimized or a guideline in C programming in any way (more of the opposite actually). |
RRacer | 0:1f58ecec51d6 | 6 | There are probably lots of ways to make this perform better, perhaps by using Neal Hormans port of the Adafruit_GFX library (http://mbed.org/users/nkhorman/code/Adafruit_GFX/). |
RRacer | 0:1f58ecec51d6 | 7 | No error checking or out-of-bounds checking is done. Use at your own peril. |
RRacer | 0:1f58ecec51d6 | 8 | For more detailed information on the driver chip, see http://www.bjtopspace.com/ziliao/CYT62726.pdf |
RRacer | 0:1f58ecec51d6 | 9 | Although the chips on my board says jx15020, I've been informed that they are equvivalent to the CYT62726, and so far it's a match. |
RRacer | 0:1f58ecec51d6 | 10 | Feel free to use all or parts of this work. |
RRacer | 0:1f58ecec51d6 | 11 | If you choose to do so, I would appreciate a small mentioning in the scrolling opening credits ;) |
RRacer | 0:1f58ecec51d6 | 12 | |
RRacer | 0:1f58ecec51d6 | 13 | Best regards, |
RRacer | 0:1f58ecec51d6 | 14 | Hugo Harming |
RRacer | 0:1f58ecec51d6 | 15 | upgraded@hotmail.com |
RRacer | 0:1f58ecec51d6 | 16 | */ |
RRacer | 0:1f58ecec51d6 | 17 | |
RRacer | 0:1f58ecec51d6 | 18 | #include "mbed.h" |
RRacer | 0:1f58ecec51d6 | 19 | #define LOW 0 |
RRacer | 0:1f58ecec51d6 | 20 | #define HIGH 1 |
RRacer | 0:1f58ecec51d6 | 21 | |
RRacer | 0:1f58ecec51d6 | 22 | BusOut ABC(p24,p25,p26); // Row address. |
RRacer | 0:1f58ecec51d6 | 23 | DigitalOut CLK(p21); // Data clock - rising edge |
RRacer | 0:1f58ecec51d6 | 24 | DigitalOut LAT(p22); // Data latch - active low (pulse up after data load) |
RRacer | 0:1f58ecec51d6 | 25 | DigitalOut OE(p23); // Output enable - active low (hold high during data load, bring low after LAT pulse) |
RRacer | 0:1f58ecec51d6 | 26 | DigitalOut R1(p27); // RED Serial in for upper half |
RRacer | 0:1f58ecec51d6 | 27 | DigitalOut R2(p28); // RED Serial in for lower half |
RRacer | 0:1f58ecec51d6 | 28 | DigitalOut G1(p5); // GREEN Serial in for upper half |
RRacer | 0:1f58ecec51d6 | 29 | DigitalOut G2(p6); // GREEN Serial in for lower half |
RRacer | 0:1f58ecec51d6 | 30 | DigitalOut B1(p7); // BLUE Serial in for upper half |
RRacer | 0:1f58ecec51d6 | 31 | DigitalOut B2(p8); // BLUE Serial in for lower half |
RRacer | 0:1f58ecec51d6 | 32 | |
RRacer | 0:1f58ecec51d6 | 33 | unsigned char gm[32][6]; // Buffer with 32x6 bytes. Graphics memory if you like. |
RRacer | 0:1f58ecec51d6 | 34 | unsigned long CT; // Counter for demo code |
RRacer | 0:1f58ecec51d6 | 35 | |
RRacer | 0:1f58ecec51d6 | 36 | void MkPattern() // Fill graphics buffer with colorful test pattern. |
RRacer | 0:1f58ecec51d6 | 37 | { |
RRacer | 0:1f58ecec51d6 | 38 | unsigned int col,r,g,b; |
RRacer | 0:1f58ecec51d6 | 39 | r=0x0f0f0f0f; |
RRacer | 0:1f58ecec51d6 | 40 | g=0x33333333; |
RRacer | 0:1f58ecec51d6 | 41 | b=0x55555555; |
RRacer | 0:1f58ecec51d6 | 42 | for(col=0; col<32; col++) { |
RRacer | 0:1f58ecec51d6 | 43 | gm[col][0]=(r>>(col % 8)) & 0xff; // Shift red value and mask out LSB. |
RRacer | 0:1f58ecec51d6 | 44 | gm[col][1]=(g>>(col % 8)) & 0xff; // Shift green value and mask out LSB. |
RRacer | 0:1f58ecec51d6 | 45 | gm[col][2]=(b>>(col % 8)) & 0xff; // Shift blue value and mask out LSB. |
RRacer | 0:1f58ecec51d6 | 46 | gm[col][3]=gm[col][0]; // Copy top red byte to bottom red byte. |
RRacer | 0:1f58ecec51d6 | 47 | gm[col][4]=gm[col][1]; // Copy top green byte to bottom green byte. |
RRacer | 0:1f58ecec51d6 | 48 | gm[col][5]=gm[col][2]; // Copy top blue byte to bottom blue byte. |
RRacer | 0:1f58ecec51d6 | 49 | } |
RRacer | 0:1f58ecec51d6 | 50 | } |
RRacer | 0:1f58ecec51d6 | 51 | |
RRacer | 0:1f58ecec51d6 | 52 | void Init() |
RRacer | 0:1f58ecec51d6 | 53 | { |
RRacer | 0:1f58ecec51d6 | 54 | // Set up things to a known state |
RRacer | 0:1f58ecec51d6 | 55 | CLK = LOW; |
RRacer | 0:1f58ecec51d6 | 56 | LAT = LOW; |
RRacer | 0:1f58ecec51d6 | 57 | OE = HIGH; //display off |
RRacer | 0:1f58ecec51d6 | 58 | ABC = 0; |
RRacer | 0:1f58ecec51d6 | 59 | CT=0; |
RRacer | 0:1f58ecec51d6 | 60 | MkPattern(); |
RRacer | 0:1f58ecec51d6 | 61 | } |
RRacer | 0:1f58ecec51d6 | 62 | |
RRacer | 0:1f58ecec51d6 | 63 | void ShiftRight() |
RRacer | 0:1f58ecec51d6 | 64 | { |
RRacer | 0:1f58ecec51d6 | 65 | unsigned char i,r,g,b; |
RRacer | 0:1f58ecec51d6 | 66 | r=gm[31][0]; // Save value of last column (top half) |
RRacer | 0:1f58ecec51d6 | 67 | g=gm[31][1]; |
RRacer | 0:1f58ecec51d6 | 68 | b=gm[31][2]; |
RRacer | 0:1f58ecec51d6 | 69 | |
RRacer | 0:1f58ecec51d6 | 70 | for(i=31; i>0; i--) { // Copy value of column n to column n-1 |
RRacer | 0:1f58ecec51d6 | 71 | gm[i][0]=gm[i-1][0]; |
RRacer | 0:1f58ecec51d6 | 72 | gm[i][1]=gm[i-1][1]; |
RRacer | 0:1f58ecec51d6 | 73 | gm[i][2]=gm[i-1][2]; |
RRacer | 0:1f58ecec51d6 | 74 | } |
RRacer | 0:1f58ecec51d6 | 75 | gm[0][0]=r; // Paste saved values from last column to first column |
RRacer | 0:1f58ecec51d6 | 76 | gm[0][1]=g; |
RRacer | 0:1f58ecec51d6 | 77 | gm[0][2]=b; |
RRacer | 0:1f58ecec51d6 | 78 | // Do it again for the lower half |
RRacer | 0:1f58ecec51d6 | 79 | r=gm[31][3]; |
RRacer | 0:1f58ecec51d6 | 80 | g=gm[31][4]; |
RRacer | 0:1f58ecec51d6 | 81 | b=gm[31][5]; |
RRacer | 0:1f58ecec51d6 | 82 | |
RRacer | 0:1f58ecec51d6 | 83 | for(i=31; i>0; i--) { |
RRacer | 0:1f58ecec51d6 | 84 | gm[i][3]=gm[i-1][3]; |
RRacer | 0:1f58ecec51d6 | 85 | gm[i][4]=gm[i-1][4]; |
RRacer | 0:1f58ecec51d6 | 86 | gm[i][5]=gm[i-1][5]; |
RRacer | 0:1f58ecec51d6 | 87 | } |
RRacer | 0:1f58ecec51d6 | 88 | gm[0][3]=r; |
RRacer | 0:1f58ecec51d6 | 89 | gm[0][4]=g; |
RRacer | 0:1f58ecec51d6 | 90 | gm[0][5]=b; |
RRacer | 0:1f58ecec51d6 | 91 | } |
RRacer | 0:1f58ecec51d6 | 92 | |
RRacer | 0:1f58ecec51d6 | 93 | void WrRow(unsigned char Row) |
RRacer | 0:1f58ecec51d6 | 94 | { |
RRacer | 0:1f58ecec51d6 | 95 | // Write specified row (and row+8) to display. Valid input: 0 to 7. |
RRacer | 0:1f58ecec51d6 | 96 | ABC=7-Row; // Set row address |
RRacer | 0:1f58ecec51d6 | 97 | for(int col=0; col<32; col++) { // To daisychain more displays, I guess you would have to increase this counter to n*32 columns. Might mirror though. |
RRacer | 0:1f58ecec51d6 | 98 | R1 = gm[col][0] & (1<<Row); // Red bit, upper half |
RRacer | 0:1f58ecec51d6 | 99 | G1 = gm[col][1] & (1<<Row); // Green bit, upper half |
RRacer | 0:1f58ecec51d6 | 100 | B1 = gm[col][2] & (1<<Row); // Blue bit, upper half |
RRacer | 0:1f58ecec51d6 | 101 | R2 = gm[col][3] & (1<<Row); // Red bit, lower half |
RRacer | 0:1f58ecec51d6 | 102 | G2 = gm[col][4] & (1<<Row); // Green bit, lower half |
RRacer | 0:1f58ecec51d6 | 103 | B2 = gm[col][5] & (1<<Row); // Blue bit, lower half |
RRacer | 0:1f58ecec51d6 | 104 | CLK = HIGH; // tick (clock bit in) |
RRacer | 0:1f58ecec51d6 | 105 | CLK = LOW; // tock |
RRacer | 0:1f58ecec51d6 | 106 | } |
RRacer | 0:1f58ecec51d6 | 107 | LAT = HIGH; // Latch entire row |
RRacer | 0:1f58ecec51d6 | 108 | LAT = LOW; |
RRacer | 0:1f58ecec51d6 | 109 | } |
RRacer | 0:1f58ecec51d6 | 110 | |
RRacer | 0:1f58ecec51d6 | 111 | void Pset(unsigned char x,unsigned char y, unsigned char c) |
RRacer | 0:1f58ecec51d6 | 112 | { |
RRacer | 0:1f58ecec51d6 | 113 | // Set pixel (x,y) to color c |
RRacer | 0:1f58ecec51d6 | 114 | // Manipulates graphics memory, so you won't see any change til you Paint() it. |
RRacer | 0:1f58ecec51d6 | 115 | unsigned char ud,l,r0,g0,b0; |
RRacer | 0:1f58ecec51d6 | 116 | ud=(y & 8)>>3; // 0 = upper half, 1 = lower half |
RRacer | 0:1f58ecec51d6 | 117 | l=y & 7; // Extract row in upper/lower half |
RRacer | 0:1f58ecec51d6 | 118 | r0=(c & 4) >>2; // Extract red bit from color |
RRacer | 0:1f58ecec51d6 | 119 | g0=(c & 2) >>1; // Extract green bit from color |
RRacer | 0:1f58ecec51d6 | 120 | b0=(c & 1); // Extract blue bit from color |
RRacer | 0:1f58ecec51d6 | 121 | // *******Removes current bit ******* *Adds bit** |
RRacer | 0:1f58ecec51d6 | 122 | gm[x][0+3*ud]=(gm[x][0+3*ud] & (255-(1<<(7-l))))+(r0<<(7-l)); // Red byte |
RRacer | 0:1f58ecec51d6 | 123 | gm[x][1+3*ud]=(gm[x][1+3*ud] & (255-(1<<(7-l))))+(g0<<(7-l)); // Green byte |
RRacer | 0:1f58ecec51d6 | 124 | gm[x][2+3*ud]=(gm[x][2+3*ud] & (255-(1<<(7-l))))+(b0<<(7-l)); // Blue byte |
RRacer | 0:1f58ecec51d6 | 125 | } |
RRacer | 0:1f58ecec51d6 | 126 | |
RRacer | 0:1f58ecec51d6 | 127 | void Paint() |
RRacer | 0:1f58ecec51d6 | 128 | { |
RRacer | 0:1f58ecec51d6 | 129 | // Write graphics memory to display |
RRacer | 0:1f58ecec51d6 | 130 | for(int Row=0; Row<8; Row++) { |
RRacer | 0:1f58ecec51d6 | 131 | OE = HIGH; // Disable output |
RRacer | 0:1f58ecec51d6 | 132 | WrRow(Row); |
RRacer | 0:1f58ecec51d6 | 133 | OE = LOW; // Enable output |
RRacer | 0:1f58ecec51d6 | 134 | wait_us(500); // Wasting some time. Use for whatever else. Probably better with a ticker for the display refresh. |
RRacer | 0:1f58ecec51d6 | 135 | } |
RRacer | 0:1f58ecec51d6 | 136 | } |
RRacer | 0:1f58ecec51d6 | 137 | |
RRacer | 0:1f58ecec51d6 | 138 | int main() |
RRacer | 0:1f58ecec51d6 | 139 | { |
RRacer | 0:1f58ecec51d6 | 140 | Init(); // Set things up |
RRacer | 0:1f58ecec51d6 | 141 | while(1) { // Messy demo loop following... |
RRacer | 0:1f58ecec51d6 | 142 | CT++; |
RRacer | 0:1f58ecec51d6 | 143 | if((CT<=2560)||(CT>=2880 && CT<=4160)) { |
RRacer | 0:1f58ecec51d6 | 144 | Paint(); // Refresh display |
RRacer | 0:1f58ecec51d6 | 145 | if((CT % 20)==0) ShiftRight(); // After every 20 refresh, do a ShiftRight |
RRacer | 0:1f58ecec51d6 | 146 | } |
RRacer | 0:1f58ecec51d6 | 147 | if(CT==2560) { |
RRacer | 0:1f58ecec51d6 | 148 | for(int c=0; c<8; c++) { |
RRacer | 0:1f58ecec51d6 | 149 | for(int x=c; x<(31-c); x++) {// Top side |
RRacer | 0:1f58ecec51d6 | 150 | Pset(x,c,c); |
RRacer | 0:1f58ecec51d6 | 151 | Paint(); // Display refresh time sets loop duration. |
RRacer | 0:1f58ecec51d6 | 152 | } |
RRacer | 0:1f58ecec51d6 | 153 | for(int y=c; y<(15-c); y++) {// Right side |
RRacer | 0:1f58ecec51d6 | 154 | Pset(31-c,y,c); |
RRacer | 0:1f58ecec51d6 | 155 | Paint(); |
RRacer | 0:1f58ecec51d6 | 156 | } |
RRacer | 0:1f58ecec51d6 | 157 | for(int x=(31-c); x>=c; x--) {// Bottom side |
RRacer | 0:1f58ecec51d6 | 158 | Pset(x,(15-c),c); |
RRacer | 0:1f58ecec51d6 | 159 | Paint(); |
RRacer | 0:1f58ecec51d6 | 160 | } |
RRacer | 0:1f58ecec51d6 | 161 | for(int y=(15-c); y>=c; y--) { // Left side |
RRacer | 0:1f58ecec51d6 | 162 | Pset(c,y,c); |
RRacer | 0:1f58ecec51d6 | 163 | Paint(); |
RRacer | 0:1f58ecec51d6 | 164 | } |
RRacer | 0:1f58ecec51d6 | 165 | } |
RRacer | 0:1f58ecec51d6 | 166 | } |
RRacer | 0:1f58ecec51d6 | 167 | if(CT>4160) { |
RRacer | 0:1f58ecec51d6 | 168 | MkPattern(); // Restore original priceless artwork |
RRacer | 0:1f58ecec51d6 | 169 | CT=0; // Start all over. |
RRacer | 0:1f58ecec51d6 | 170 | } |
RRacer | 0:1f58ecec51d6 | 171 | } |
RRacer | 0:1f58ecec51d6 | 172 | } |