From cc620d0239ac06880338b25064e31b6b40ed5312 Mon Sep 17 00:00:00 2001
From: Charly Oudy <charly.oudy@lip6.fr>
Date: Mon, 9 Jan 2023 01:00:31 +0100
Subject: [PATCH] Fixed simple_demo_avr example

---
 examples/simple_demo_avr/simple_demo_avr.ino | 80 +++++++++++++-------
 1 file changed, 52 insertions(+), 28 deletions(-)

diff --git a/examples/simple_demo_avr/simple_demo_avr.ino b/examples/simple_demo_avr/simple_demo_avr.ino
index cf836ed..12f1789 100644
--- a/examples/simple_demo_avr/simple_demo_avr.ino
+++ b/examples/simple_demo_avr/simple_demo_avr.ino
@@ -1,27 +1,40 @@
+#include <Arduino.h>
 //
 // OneBitDisplay library demo for AVR platform,
-// without line drawing function (saving of 1K RAM)
 //
+
 #include <OneBitDisplay.h>
 
+
+// I²C Setup
+#define SDA_PIN A4    // change if needed according to your setup
+#define SCL_PIN A5    // change if needed according to your setup ()
+#define USE_HW_I2C 1  // Use bit banging to get higher speed output
+#define OLED_ADDR -1  // let OneBitDisplay find the address of our display
+
+// Screen Setup
+#define OLED_SIZE OLED_72x40 // Size of the display
+#define RESET_PIN -1         // Using the mcu reset
+#define FLIP180    0
+#define INVERT     0
+#define WIDTH     72                   // Helper to calculate te buffer size according to the screen width in pixels
+#define HEIGHT    40                   // Helper to calculate te buffer size according to the screen height in pixels
+#define BUFFER_SIZE (WIDTH*HEIGHT) / 8 // the actual size of the buffer needed for your screen
+
+// Globals
 OBDISP obd;
-#define SDA_PIN -1
-#define SCL_PIN -1
-// no reset pin needed
-#define RESET_PIN -1
-// let OneBitDisplay find the address of our display
-#define OLED_ADDR -1
-#define FLIP180 0
-#define INVERT 0
-// Use the default Wire library
-#define USE_HW_I2C 1
+static uint8_t ucBuffer[BUFFER_SIZE] = {0};
+
 void setup()
 {
+    
     int rc;
-    rc = obdI2CInit(&obd, OLED_128x64, OLED_ADDR, FLIP180, INVERT, USE_HW_I2C, SDA_PIN, SCL_PIN, RESET_PIN, 400000L);       // Standard HW I2C bus at 400Khz
-
+    rc = obdI2CInit(&obd, OLED_SIZE, OLED_ADDR, FLIP180, INVERT, USE_HW_I2C, SDA_PIN, SCL_PIN, RESET_PIN, 400000L);       // Standard HW I2C bus at 400Khz
+    
     if (rc != OLED_NOT_FOUND)
     {
+        obdSetBackBuffer(&obd, ucBuffer);
+
         char *msgs[] =
         {
           (char *)"SSD1306 @ 0x3C",
@@ -30,9 +43,17 @@ void setup()
           (char *)"SH1106 @ 0x3D"
         };
 
-        obdFill(&obd, 0, 1);
-        obdWriteString(&obd, 0, 0, 0, (char *)"OLED found:", FONT_8x8, 0, 1);
-        obdWriteString(&obd, 0, 10, 2, msgs[rc], FONT_8x8, 0, 1);
+        // Display address and chipset
+        obdFill(&obd, 0x00, 1);
+        obdSetTextWrap(&obd, 1 );
+        obdWriteString(&obd, 0, 0, 0, (char *)"OLED found:", FONT_SMALL, OBD_BLACK, 1);
+        obdWriteString(&obd, 0, 0, 8, msgs[rc], FONT_SMALL, OBD_BLACK, 1);
+        delay(3000);
+
+        // Display a rectangle for demo
+        obdFill(&obd, 0x00, 1);
+        obdRectangle(&obd, 0, 0, obd.width-1, obd.height-1, OBD_BLACK, 0);
+        obdDumpBuffer(&obd, ucBuffer);
         delay(3000);
     }
 }
@@ -40,22 +61,25 @@ void setup()
 void loop()
 {
     int i, x, y;
-
-    obdFill(&obd, 0, 1);
-    obdWriteString(&obd, 0, 28, 0,(char *)"OLED Demo", FONT_8x8, 0, 1);
-    obdWriteString(&obd, 0, 0, 1,(char *)"Written by Larry Bank", FONT_6x8, 1, 1);
-    obdWriteString(&obd, 0, 0, 3,(char *)"**Demo**", FONT_16x16, 0, 1);
-    obdWriteString(&obd, 0, 9, 6,(char *)"for AVR", FONT_16x16, 0, 1);
+    
+    obdFill(&obd, 0x00, 1);
+    obdWriteString(&obd, 0, 0, 0,(char *)"OLED Demo", FONT_NORMAL, OBD_BLACK, 1);
+    obdSetTextWrap(&obd, 1 );
+    obdWriteString(&obd, 0, 0, -1,(char *)"Written by Larry Bank", FONT_SMALL, OBD_BLACK, 1);
+    obdWriteString(&obd, 0, 0, -1,(char *)"**Demo**", FONT_NORMAL, OBD_BLACK, 1);
+    obdWriteString(&obd, 0, 9, -1,(char *)"for AVR", FONT_NORMAL, OBD_BLACK, 1);
 
     delay(2000);
-    obdFill(&obd, 0, 1);
+    
+    obdFill(&obd, 0x00, 1);
 
-    for (i = 0; i < 1000; i++)
+    for (i = 0; i < 30; i++)
     {
-        x = random(128);
-        y = random(64);
-        obdSetPixel(&obd, x, y, 1, 1);
+        x = random(obd.width);
+        y = random(obd.height);
+        obdSetPixel(&obd, x, y, OBD_BLACK, 1);
+        obdDumpBuffer(&obd, ucBuffer);
     }
 
     delay(2000);
-}
+}
\ No newline at end of file