From 8dd6bf51b851ff3f32a7f981b76ed240118dbc24 Mon Sep 17 00:00:00 2001
From: mrfaptastic <12006953+mrfaptastic@users.noreply.github.com>
Date: Thu, 19 Aug 2021 19:39:08 +0100
Subject: [PATCH] Update double buffer example

---
 .../DoubleBufferSwap/DoubleBufferSwap.ino     | 83 -------------------
 .../SmoothDoubleBuffer/SmoothDoubleBuffer.ino | 65 +++++++++++++++
 2 files changed, 65 insertions(+), 83 deletions(-)
 delete mode 100644 examples/DoubleBufferSwap/DoubleBufferSwap.ino
 create mode 100644 examples/SmoothDoubleBuffer/SmoothDoubleBuffer.ino

diff --git a/examples/DoubleBufferSwap/DoubleBufferSwap.ino b/examples/DoubleBufferSwap/DoubleBufferSwap.ino
deleted file mode 100644
index 997da7b..0000000
--- a/examples/DoubleBufferSwap/DoubleBufferSwap.ino
+++ /dev/null
@@ -1,83 +0,0 @@
-#include <ESP32-HUB75-MatrixPanel-I2S-DMA.h>
-
-MatrixPanel_I2S_DMA *display = nullptr;
-
-const byte row0 = 2+0*10;
-const byte row1 = 2+1*10;
-const byte row2 = 2+2*10;
-
-
-void setup() 
-{
- 
-  // put your setup code here, to run once:
-  delay(1000); Serial.begin(115200); delay(200);
-
-  Serial.println("...Starting Display");
-  
-  HUB75_I2S_CFG mxconfig;
-  mxconfig.double_buff = true; // Turn of double buffer
-
-  // OK, now we can create our matrix object
-  display = new MatrixPanel_I2S_DMA(mxconfig);  
-  
-  
-  display->begin();  // setup display with pins as per defined in the library
-  display->setTextColor(display->color565(255, 255, 255));  
-
-  
-  // Buffer 0 test
-  display->fillScreen(display->color565(128, 0, 0));  
-  display->setCursor(3, row0);
-  display->print(F("Buffer 0"));
-  display->setCursor(3, row1);
-  display->print(F(" Buffer 0"));
-  Serial.println("Wrote to to Buffer 0");
-  display->showDMABuffer(); 
-  delay(1500);
-  
-  // Buffer 1 test
-  display->flipDMABuffer();
-  display->fillScreen(display->color565(0, 128, 0)); // shouldn't see this
-  display->setCursor(3, row0);
-  display->print(F("Buffer 1"));
-  display->setCursor(3, row2);
-  display->print(F(" Buffer 1"));
- 
-  Serial.println("Wrote to to Buffer 1");
-  display->showDMABuffer();  
-  delay(1500);
-
-}
-
-void loop() {
-  
-  // Flip the back buffer
-  display->flipDMABuffer();
-
-  // Write: Set bottow row to black
-  for (int y=20;y<MATRIX_HEIGHT; y++)
-  for (int x=0;x<MATRIX_WIDTH; x++)
-  {
-    display->drawPixelRGB888( x, y, 0, 0, 0);
-  }
-
-  // Write:  Set bottom row to blue (this is what should show)
-  for (int y=20;y<MATRIX_HEIGHT; y++)
-  for (int x=0;x<MATRIX_WIDTH; x++)
-  {
-    display->drawPixelRGB888( x, y, 0, 0, 64);
-  }
-
-  // Now show this back buffer
-  display->showDMABuffer();  
-  delay(1000);
-
-  // Flip back buffer
-  display->flipDMABuffer();   
-
-  // Show this buffer
-  display->showDMABuffer();   
-  delay(1000); 
-
-}
\ No newline at end of file
diff --git a/examples/SmoothDoubleBuffer/SmoothDoubleBuffer.ino b/examples/SmoothDoubleBuffer/SmoothDoubleBuffer.ino
new file mode 100644
index 0000000..114f5ee
--- /dev/null
+++ b/examples/SmoothDoubleBuffer/SmoothDoubleBuffer.ino
@@ -0,0 +1,65 @@
+#include <ESP32-HUB75-MatrixPanel-I2S-DMA.h>
+
+MatrixPanel_I2S_DMA *display = nullptr;
+
+const byte row0 = 2+0*11;
+const byte row1 = 2+1*11;
+const byte row2 = 2+2*11;
+
+int start_x   = 0;
+int buffer_id = 0;
+
+
+void setup() 
+{
+  // put your setup code here, to run once:
+  delay(1000); 
+  Serial.begin(115200);
+  delay(200);
+
+  Serial.println("...Starting Display");
+  HUB75_I2S_CFG mxconfig;
+  mxconfig.double_buff 	= true; // Turn of double buffer
+  mxconfig.clkphase 	= true;
+
+  // OK, now we can create our matrix object
+  display = new MatrixPanel_I2S_DMA(mxconfig);  
+  
+  display->begin();  // setup display with pins as pre-defined in the library
+  display->setTextColor(display->color565(255, 255, 255));  
+  
+  start_x = display->width();
+}
+
+const int square_size = 16;
+void loop() 
+{   
+  display->flipDMABuffer();    
+  //if ( !display->backbuffready() ) return;
+  //display->showDMABuffer();        
+  display->clearScreen();  
+    
+  buffer_id ^= 1;
+
+  // Blue square on the left is printed to BOTH buffers.
+  display->fillRect(0, 0, square_size/2, square_size/2, display->color565(0,0,200));
+
+  start_x--;
+
+  if (buffer_id)
+  {
+    display->setCursor(3, row1);    
+    display->fillRect(start_x, 6, square_size, square_size, display->color565(200,0,0));
+    //delay(40); // simulate slow drawing operation
+  } 
+  else 
+  {
+    display->setCursor(3, row2);    
+    display->fillRect(10, start_x, square_size, square_size, display->color565(0,200,0));    
+  }
+  
+  display->printf("Buffer %d", buffer_id);
+ 
+  if (start_x < (-1*square_size)) start_x = display->width()+square_size;
+  
+}
\ No newline at end of file