Update

ESP32-HUB75-MatrixPanel-I2S-DMA.h

@@ -351,6 +351,8 @@ class MatrixPanel_I2S_DMA {
     /* Propagate the DMA pin configuration, allocate DMA buffs and start data ouput, initialy blank */
     bool begin(){
 		
+	  if (initialized) return; // we don't do this twice or more!
+
       // Change 'if' to '1' to enable, 0 to not include this Serial output in compiled program        
       #if SERIAL_DEBUG       
             Serial.printf_P(PSTR("Using pin %d for the R1_PIN\n"), m_cfg.gpio.r1);

examples/1_SimpleTestShapes/1_SimpleTestShapes.ino

@@ -111,9 +111,6 @@ void setup() {
   dma_display->clearScreen();
   dma_display->fillScreen(myWHITE);
   
-//
-  dma_display->begin(); // use default pins  
-
   // fix the screen with green
   dma_display->fillRect(0, 0, dma_display->width(), dma_display->height(), dma_display->color444(0, 15, 0));
   delay(500);