Addition of faster fillScreen function

Addition of a function to wipe the entire DMA buffer / screen with a single color in a quicker manner.

ESP32-RGB64x32MatrixPanel-I2S-DMA.cpp

@@ -169,6 +169,7 @@ void RGB64x32MatrixPanel_I2S_DMA::configureDMA()
 	
 } // end initMatrixDMABuff
 
+/* Update a specific co-ordinate in the DMA buffer */
 void RGB64x32MatrixPanel_I2S_DMA::updateMatrixDMABuffer(int16_t x_coord, int16_t y_coord, uint8_t red, uint8_t green, uint8_t blue)
 {
   
@@ -312,9 +313,112 @@ void RGB64x32MatrixPanel_I2S_DMA::updateMatrixDMABuffer(int16_t x_coord, int16_t
   i2s_parallel_flip_to_buffer(&I2S1, backbuf_id);
   //swapBuffer();
   
+} // updateDMABuffer
+
+
+/* Update the entire buffer with a single specific colour - quicker */
+void RGB64x32MatrixPanel_I2S_DMA::updateMatrixDMABuffer(uint8_t red, uint8_t green, uint8_t blue)
+{
+	
+  for (unsigned int y_coord = 0; y_coord < ROWS_PER_FRAME; y_coord++) // half height - 16 iterations
+  {	
+    for(int color_depth_idx=0; color_depth_idx<COLOR_DEPTH_BITS; color_depth_idx++)  // color depth - 8 iterations
+    {
+        uint16_t mask = (1 << color_depth_idx); // 24 bit color
+        
+        // The destination for the pixel bitstream 
+        rowBitStruct *p = &matrixUpdateFrames[backbuf_id].rowdata[y_coord].rowbits[color_depth_idx]; //matrixUpdateFrames location to write to uint16_t's
+
+        for(int x_coord=0; x_coord < MATRIX_WIDTH; x_coord++) // row pixel width 64 iterations
+        { 		
+			
+			int v=0; // the output bitstream
+			
+			// if there is no latch to hold address, output ADDX lines directly to GPIO and latch data at end of cycle
+			int gpioRowAddress = y_coord;
+			
+			// normally output current rows ADDX, special case for LSB, output previous row's ADDX (as previous row is being displayed for one latch cycle)
+			if(color_depth_idx == 0)
+			  gpioRowAddress = y_coord-1;
+			
+			if (gpioRowAddress & 0x01) v|=BIT_A; // 1
+			if (gpioRowAddress & 0x02) v|=BIT_B; // 2
+			if (gpioRowAddress & 0x04) v|=BIT_C; // 4
+			if (gpioRowAddress & 0x08) v|=BIT_D; // 8
+			if (gpioRowAddress & 0x10) v|=BIT_E; // 16
+			
+			// need to disable OE after latch to hide row transition
+			if((x_coord) == 0) v|=BIT_OE;
+			
+			// drive latch while shifting out last bit of RGB data
+			if((x_coord) == PIXELS_PER_LATCH-1) v|=BIT_LAT;
+			
+			// turn off OE after brightness value is reached when displaying MSBs
+			// MSBs always output normal brightness
+			// LSB (!color_depth_idx) outputs normal brightness as MSB from previous row is being displayed
+			if((color_depth_idx > lsbMsbTransitionBit || !color_depth_idx) && ((x_coord) >= brightness)) v|=BIT_OE; // For Brightness
+			
+			// special case for the bits *after* LSB through (lsbMsbTransitionBit) - OE is output after data is shifted, so need to set OE to fractional brightness
+			if(color_depth_idx && color_depth_idx <= lsbMsbTransitionBit) {
+			  // divide brightness in half for each bit below lsbMsbTransitionBit
+			  int lsbBrightness = brightness >> (lsbMsbTransitionBit - color_depth_idx + 1);
+			  if((x_coord) >= lsbBrightness) v|=BIT_OE; // For Brightness
+			}
+			
+			// need to turn off OE one clock before latch, otherwise can get ghosting
+			if((x_coord)==PIXELS_PER_LATCH-1) v|=BIT_OE;
+
+			
+			// Top half colours
+			if (green & mask)
+				v|=BIT_G1;
+			if (blue & mask)
+				v|=BIT_B1;           
+			if (red & mask)
+				v|=BIT_R1;
+
+			// Bottom half colours
+			if (red & mask)
+			v|=BIT_R2;
+			if (green & mask) 
+			v|=BIT_G2;
+			if (blue & mask)
+			v|=BIT_B2;
+
+			
+			// 16 bit parallel mode
+			//Save the calculated value to the bitplane memory in reverse order to account for I2S Tx FIFO mode1 ordering
+			if(x_coord%2)
+			{
+			  p->data[(x_coord)-1] = v;
+			} else {
+			  p->data[(x_coord)+1] = v;
+			} // end reordering
+			
+		} // end x_coord iteration
+    } // colour depth loop (8)
+  } // end row iteration
+  
+  //Show our work!
+  i2s_parallel_flip_to_buffer(&I2S1, backbuf_id);
+  swapBuffer();
   
 } // updateDMABuffer
 
+
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+
 /*
 // WORK IN PROGRESS
 void RGB64x32MatrixPanel_I2S_DMA::writeRGB24Frame2DMABuffer(rgb_24 *framedata, int16_t frame_width = MATRIX_WIDTH, int16_t frame_height = MATRIX_HEIGHT)

ESP32-RGB64x32MatrixPanel-I2S-DMA.h

@@ -171,7 +171,7 @@ class RGB64x32MatrixPanel_I2S_DMA : public Adafruit_GFX {
       allocateDMAbuffers();
 	  
 		backbuf_id = 0;
-		brightness = 64; // default to max brightness, wear sunglasses when looking directly at panel.
+		brightness = 32; // default to max brightness, wear sunglasses when looking directly at panel.
 		
     }
 	
@@ -185,9 +185,13 @@ class RGB64x32MatrixPanel_I2S_DMA : public Adafruit_GFX {
 	  swapBuffer();
     }
 	
+	// TODO: Disable/Enable auto buffer flipping (useful for lots of drawPixel usage)...
+ 
 	
     // Draw pixels
-    virtual void drawPixel(int16_t x, int16_t y, uint16_t color); // adafruit implementation
+    virtual void drawPixel(int16_t x, int16_t y, uint16_t color); 	// overwrite adafruit implementation
+	virtual void fillScreen(uint16_t color); 						// overwrite adafruit implementation
+	       void clearScreen() { fillScreen(0); } 
     inline void drawPixelRGB565(int16_t x, int16_t y, uint16_t color);
     inline void drawPixelRGB888(int16_t x, int16_t y, uint8_t r, uint8_t g, uint8_t b);
 	inline void drawPixelRGB24(int16_t x, int16_t y, rgb_24 color);
@@ -236,9 +240,11 @@ class RGB64x32MatrixPanel_I2S_DMA : public Adafruit_GFX {
     void configureDMA(); // Get everything setup. Refer to the .c file
 
     
-    // Paint a pixel to the DMA buffer directly
+    // Update a specific pixel in the DMA buffer a colour 
     void updateMatrixDMABuffer(int16_t x, int16_t y, uint8_t red, uint8_t green, uint8_t blue);
    
+    // Update the entire DMA buffer a certain colour (wipe the screen basically)
+    void updateMatrixDMABuffer(uint8_t red, uint8_t green, uint8_t blue);
   	
   	// Internal variables
   	bool dma_configuration_success;
@@ -257,11 +263,20 @@ class RGB64x32MatrixPanel_I2S_DMA : public Adafruit_GFX {
 
 /***************************************************************************************/   
 
-inline void RGB64x32MatrixPanel_I2S_DMA::drawPixel(int16_t x, int16_t y, uint16_t color) 
+inline void RGB64x32MatrixPanel_I2S_DMA::drawPixel(int16_t x, int16_t y, uint16_t color) // adafruit virtual void override
 {
   drawPixelRGB565( x, y, color);
 } 
 
+inline void RGB64x32MatrixPanel_I2S_DMA::fillScreen(uint16_t color)  // adafruit virtual void override
+{
+  uint8_t r = ((((color >> 11) & 0x1F) * 527) + 23) >> 6;
+  uint8_t g = ((((color >> 5) & 0x3F) * 259) + 33) >> 6;
+  uint8_t b = (((color & 0x1F) * 527) + 23) >> 6;
+  
+  updateMatrixDMABuffer(r, g, b); // the RGB only (no pixel coordinate) version of 'updateMatrixDMABuffer'
+} 
+
 // For adafruit
 inline void RGB64x32MatrixPanel_I2S_DMA::drawPixelRGB565(int16_t x, int16_t y, uint16_t color) 
 {