From 3bd12b6379a8d372fecdc4e11234a8c87fb458a8 Mon Sep 17 00:00:00 2001
From: Lorandil <70488869+Lorandil@users.noreply.github.com>
Date: Sun, 7 Jul 2024 16:59:31 +0200
Subject: [PATCH 1/2] Alternate init method to reduce flash footprint by ~52
 bytes

The standard init method fills the screen with zero bytes. If this behaviour is not required, removing the call to fillscreen() saves ~52 bytes of valuable flash memory ;)
---
 ssd1306xled.cpp | 14 ++++++++++++++
 ssd1306xled.h   |  4 ++++
 2 files changed, 18 insertions(+)

diff --git a/ssd1306xled.cpp b/ssd1306xled.cpp
index 1727c25..b070b1a 100644
--- a/ssd1306xled.cpp
+++ b/ssd1306xled.cpp
@@ -165,6 +165,20 @@ void SSD1306Device::ssd1306_init(void)
 	ssd1306_fillscreen(0);
 }
 
+// A shorter init saves 52 flash bytes (if zeroed screen is not required)
+// The code of 'ssd1306_init()' is replicated to allow the linker to drop the unused method during linkage.
+void SSD1306Device::ssd1306_tiny_init(void)
+{
+	begin();
+	ssd1306_send_command_start();
+	for (uint8_t i = 0; i < sizeof (ssd1306_init_sequence); i++) {
+		ssd1306_send_byte(pgm_read_byte(&ssd1306_init_sequence[i]));
+	}
+	ssd1306_send_command_stop();
+	// save 52 bytes :)
+	//ssd1306_fillscreen(0);
+}
+
 void SSD1306Device::ssd1306_send_command_start(void) {
 	I2CStop();
 	I2CStart(SSD1306_SA, 0);
diff --git a/ssd1306xled.h b/ssd1306xled.h
index 46833cd..e8a4d83 100644
--- a/ssd1306xled.h
+++ b/ssd1306xled.h
@@ -19,6 +19,9 @@
 #ifndef SSD1306XLED_H
 #define SSD1306XLED_H
 
+#define _SSD1306XLED_TINY_INIT_SUPPORTED_
+
+
 // ----------------------------------------------------------------------------
 
 // -----(+)--------------->	// Vcc,	Pin 1 on SSD1306 Board
@@ -73,6 +76,7 @@ class SSD1306Device
     public:
 		SSD1306Device(void);
 		void ssd1306_init(void);
+		void ssd1306_tiny_init(void);
 
 		void ssd1306_send_data_start(void);
 		void ssd1306_send_data_stop(void);

From 31ea214439c91aca715feff0d1964f80e90ee52c Mon Sep 17 00:00:00 2001
From: Lorandil <70488869+Lorandil@users.noreply.github.com>
Date: Sun, 7 Jul 2024 17:14:04 +0200
Subject: [PATCH 2/2] updated documentation

---
 README.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/README.md b/README.md
index 4f7f9ff..0fca791 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,7 @@ void run() {
 
 - Library functions
     - `void ssd1306_init(void)`: initializes the screen
+    - `void ssd1306_tiny_init(void)`: initializes the screen without filling the screen with '0'
     - `void ssd1306_send_data_start(void)`: put the communication with a screen in data mode
     - `void ssd1306_send_data_stop(void)`: stops the communication 
     - `void ssd1306_send_byte(uint8_t byte)`: send data byte to screen
@@ -65,6 +66,8 @@ This code is mainly written by Neven Boyanov, Tinusar team. I replaced their I2C
 ### Versions
 - v0.0.1 (March 08, 2020)
     - initial release
+- v0.0.2 (July 07, 2024)
+    - added 'ssd1306_tiny_init()' to save flash memory if an initial screen fill is not required (~52 bytes shorter)