Create HueValueSpectrum.ino

examples/HueValueSpectrum/HueValueSpectrum.ino

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+#define PANEL_RES_X 64    // Number of pixels wide of each INDIVIDUAL panel module. 
+#define PANEL_RES_Y 32     // Number of pixels tall of each INDIVIDUAL panel module.
+#define PANEL_CHAIN 1      // Total number of panels chained one to another
+
+#include <ESP32-HUB75-MatrixPanel-I2S-DMA.h>
+
+MatrixPanel_I2S_DMA *dma_display = nullptr;
+
+void setup() {
+
+
+  HUB75_I2S_CFG::i2s_pins _pins={
+    25, //R1_PIN, 
+    26, //G1_PIN, 
+    27, //B1_PIN, 
+    14, //R2_PIN, 
+    12, //G2_PIN, 
+    13, //B2_PIN, 
+    23, //A_PIN, 
+    19, //B_PIN, 
+    5, //C_PIN, 
+    17, //D_PIN, 
+    18, //E_PIN,
+    4, //LAT_PIN, 
+    15, //OE_PIN, 
+    16, //CLK_PIN
+  };
+  HUB75_I2S_CFG mxconfig(
+    PANEL_RES_X, // Module width
+    PANEL_RES_Y, // Module height
+    PANEL_CHAIN //, // chain length
+    //_pins // pin mapping -- uncomment if providing own custom pin mapping as per above.
+  );
+  //mxconfig.clkphase = false;
+  //mxconfig.driver = HUB75_I2S_CFG::FM6126A;
+
+  // Display Setup
+  dma_display = new MatrixPanel_I2S_DMA(mxconfig);
+  dma_display->begin();
+  dma_display->clearScreen();
+}
+
+void loop() {
+  // Canvas loop
+  float t = (float) ((millis()%4000)/4000.f);
+  float tt = (float) ((millis()%16000)/16000.f);
+
+  for(int x = 0; x < (PANEL_RES_X*PANEL_CHAIN); x++)
+  {
+    // calculate the overal shade
+    float f = (((sin(tt-(float)x/PANEL_RES_Y/32.)*2.f*PI)+1)/2)*255;
+    // calculate hue spectrum into rgb
+    float r = max(min(cosf(2.f*PI*(t+((float)x/PANEL_RES_Y+0.f)/3.f))+0.5f,1.f),0.f);
+    float g = max(min(cosf(2.f*PI*(t+((float)x/PANEL_RES_Y+1.f)/3.f))+0.5f,1.f),0.f);
+    float b = max(min(cosf(2.f*PI*(t+((float)x/PANEL_RES_Y+2.f)/3.f))+0.5f,1.f),0.f);
+
+    // iterate pixels for every row
+    for(int y = 0; y < PANEL_RES_Y; y++){
+      if(y*2 < PANEL_RES_Y){
+        // top-middle part of screen, transition of value
+        float t = (2.f*y+1)/PANEL_RES_Y;
+        dma_display->drawPixelRGB888(x,y,
+          (r*t)*f,
+          (g*t)*f,
+          (b*t)*f
+        );
+      }else{
+        // middle to bottom of screen, transition of saturation
+        float t = (2.f*(PANEL_RES_Y-y)-1)/PANEL_RES_Y;
+        dma_display->drawPixelRGB888(x,y,
+          (r*t+1-t)*f,
+          (g*t+1-t)*f,
+          (b*t+1-t)*f
+        );
+      }
+    }
+  }
+}