#759

src/ESP32-HUB75-MatrixPanel-I2S-DMA.cpp

@@ -625,7 +625,60 @@ void MatrixPanel_I2S_DMA::clearFrameBuffer(bool _buff_id)
  * @param brt - brightness level from 0 to 255 - NOT MATRIX_WIDTH
  * @param _buff_id - buffer id to control
  */
-void MatrixPanel_I2S_DMA::brtCtrlOEv2(uint8_t brt, const int _buff_id)
+/*
+void MatrixPanel_I2S_DMA::setBrightnessOE(uint8_t brightness, const int buffer_id) {
+
+  if (!initialized)
+    return;
+
+  frameStruct *frameBuffer = &frame_buffer[buffer_id];
+
+  uint8_t blanking = m_cfg.latch_blanking; // Prevent overwriting during latch blanking
+  uint8_t colorDepth = frameBuffer->rowBits[0]->colour_depth;
+  uint16_t width = frameBuffer->rowBits[0]->width;
+
+  // Iterate through each row in the DMA buffer
+  for (int rowIdx = frameBuffer->rowBits.size() - 1; rowIdx >= 0; --rowIdx) {
+    
+    // Process each bitplane (color depth level)
+    for (int depthIdx = colorDepth - 1; depthIdx >= 0; --depthIdx) {
+      int bitPlane = (2 * colorDepth - depthIdx) % colorDepth;
+      int bitShift = (colorDepth - lsbMsbTransitionBit - 1) >> 1;
+      int rightShift = std::max(bitPlane - bitShift - 2, 0);
+
+      // Calculate the brightness range for OE control
+      int activePixelRange = ((width - blanking) * brightness) >> (7 + rightShift);
+      activePixelRange = (activePixelRange >> 1) | (activePixelRange & 1);
+
+      int xCoordMin = (width - activePixelRange) >> 1;
+      int xCoordMax = (width + activePixelRange + 1) >> 1;
+
+      // Get pointer to the specific row and bitplane
+      ESP32_I2S_DMA_STORAGE_TYPE *rowData = frameBuffer->rowBits[rowIdx]->getDataPtr(depthIdx);
+
+      // Set OE bits based on brightness thresholds
+      for (int x = width - 1; x >= 0; --x) {
+        if (x >= xCoordMin && x < xCoordMax) {
+          rowData[ESP32_TX_FIFO_POSITION_ADJUST(x)] &= BITMASK_OE_CLEAR; // Enable output
+        } else {
+          rowData[ESP32_TX_FIFO_POSITION_ADJUST(x)] |= BIT_OE; // Disable output
+        }
+      }
+    }
+	
+	// switch pointer to a row for a specific colour index
+	#if defined(SPIRAM_DMA_BUFFER)
+		ESP32_I2S_DMA_STORAGE_TYPE *row_hack = fb->rowBits[rowIdx]->getDataPtr(0);
+		//Cache_WriteBack_Addr((uint32_t)row_hack, sizeof(ESP32_I2S_DMA_STORAGE_TYPE) * ((fb->rowBits[row_idx]->width * fb->rowBits[row_idx]->colour_depth) - 1));
+		Cache_WriteBack_Addr((uint32_t)row_hack, fb->rowBits[rowIdx]->getColorDepthSize());
+	#endif
+	
+  }
+} 
+*/
+
+
+void MatrixPanel_I2S_DMA::setBrightnessOE(uint8_t brt, const int _buff_id)
 {
 
   if (!initialized)
@@ -691,6 +744,7 @@ void MatrixPanel_I2S_DMA::brtCtrlOEv2(uint8_t brt, const int _buff_id)
   } while (row_idx);
 }
 
+
 /*
  *  overload for compatibility
  */

src/ESP32-HUB75-MatrixPanel-I2S-DMA.h

@@ -640,11 +640,11 @@ public:
     }
 
     brightness = b;
-    brtCtrlOEv2(b, 0);
+    setBrightnessOE(b, 0);
 
     if (m_cfg.double_buff)
     {
-      brtCtrlOEv2(b, 1);
+      setBrightnessOE(b, 1);
     }
   }
 
@@ -731,12 +731,12 @@ protected:
   inline void resetbuffers()
   {
     clearFrameBuffer(0);        
-    brtCtrlOEv2(brightness, 0); 
+    setBrightnessOE(brightness, 0); 
 
     if (m_cfg.double_buff) {
 		
       clearFrameBuffer(1);        
-      brtCtrlOEv2(brightness, 1);
+      setBrightnessOE(brightness, 1);
 
     }
   }
@@ -806,7 +806,7 @@ private:
    * @param brt - brightness level from 0 to row_width
    * @param _buff_id - buffer id to control
    */
-  void brtCtrlOEv2(uint8_t brt, const int _buff_id = 0);
+  void setBrightnessOE(uint8_t brt, const int _buff_id = 0);
 
   /**
    * @brief - transforms coordinates according to orientation

src/ESP32-HUB75-VirtualMatrixPanel_T.hpp

@@ -129,54 +129,19 @@ struct ScanTypeMapping {
 		}
 		else if constexpr (ScanType == FOUR_SCAN_40_80PX_HFARCAN) 
 		{
+			//  Weird mapping: https://github.com/mrcodetastic/ESP32-HUB75-MatrixPanel-DMA/issues/759
+			panel_pixel_base = 16;
 
-		  /* 
-		   * Weird mapping: https://github.com/mrcodetastic/ESP32-HUB75-MatrixPanel-DMA/issues/759
-		   * Panel is annoyingly weird. When sent DMA signal as if it's a
-		   * 160px wide and 20px high. Then the DMA signal pixel (0,0) is
-		   * shown on row 10.
-		   * Then pixel 15 (i.e. 16 in real world), is at the physical of
-		   * 0,0 (i.e. top left pixel), which then goes for 32 pixel.
-		   * Then the next 32 pixel are at row 10 again. And so on and so forth.
-		   */			
+            // Mapping logic
+            int panel_local_x = coords.x % 80; // Compensate for chain of panels
 
-			int panel_local_x = coords.x % 80; // compensate for chain of these panels 
-			int logical_dma_y = (coords.y % 10) + 10 * ((coords.y / 20) % 2); // not impacted by chaining
+            if ((((coords.y) / 10) % 2) ^ ((panel_local_x / panel_pixel_base) % 2)) {
+                coords.x += ((coords.x / panel_pixel_base) * panel_pixel_base);
+            } else {
+                coords.x += (((coords.x / panel_pixel_base) + 1) * panel_pixel_base);
+            }
 
-			int logical_dma_x = 0;
-			int logical_x_option = (coords.y/10)%2;
-
-			// Option 0 - phyiscal lines 0-9, 20-29
-			if (logical_x_option == 0) {
-				
-				if (panel_local_x < 32) {
-					logical_dma_x += 16;
-				}
-				else if (panel_local_x < 64) {
-					logical_dma_x += 48;  
-				}
-				else if (panel_local_x < 80) {
-					logical_dma_x += 80;  
-				}
-				
-			} else {
-
-				// Option 1
-				if (panel_local_x < 16) {
-				}
-				else if (panel_local_x < 48) {
-					logical_dma_x += 32;  
-				}
-				else if (panel_local_x < 80) {
-					logical_dma_x += 64;  
-				}
-			}
-			
-			// What logical row are we addressing?
-			logical_dma_x += panel_local_x;
-			
-			coords.x = logical_dma_x;
-			coords.y = logical_dma_y;
+            coords.y = (coords.y % 10) + 10 * ((coords.y / 20) % 2);
 			
 		}		
 		//	FOUR_SCAN_64PX_HIGH || FOUR_SCAN_32PX_HIGH

testing/four_scan_40_80px_hfarcan.cpp

@@ -0,0 +1,45 @@
+#include <iostream>
+#include <iomanip> // For output formatting
+
+
+// FOUR_SCAN_40_80PX_HFARCAN test
+struct Coords {
+    int x;
+    int y;
+};
+
+int main() {
+    int panel_pixel_base = 16; // Updated pixel base
+    Coords coords;
+
+    // Header for easy Excel copying (Pipe-delimited format)
+    std::cout << "Input X|Input Y|Output X|Output Y" << std::endl;
+
+    // Loop for testing multiple inputs
+    for (int y = 0; y < 40; y += 3) { // Updated y increment to 3
+        for (int x = 0; x < 80; x += 10) {
+            coords.x = x;
+            coords.y = y;
+
+            // Store original coordinates for display
+            int input_x = coords.x;
+            int input_y = coords.y;
+
+            // Mapping logic
+            int panel_local_x = coords.x % 80; // Compensate for chain of panels
+
+            if ((((coords.y) / 10) % 2) ^ ((panel_local_x / panel_pixel_base) % 2)) {
+                coords.x += ((coords.x / panel_pixel_base) * panel_pixel_base);
+            } else {
+                coords.x += (((coords.x / panel_pixel_base) + 1) * panel_pixel_base);
+            }
+
+            coords.y = (coords.y % 10) + 10 * ((coords.y / 20) % 2);
+
+            // Output results in pipe-delimited format for easy Excel import
+            std::cout << input_x << "|" << input_y << "|" << coords.x << "|" << coords.y << std::endl;
+        }
+    }
+
+    return 0;
+}