diff --git a/lib/oled_ssd1306.c b/lib/oled_ssd1306.c
index 36d45a9..7c4e68b 100644
--- a/lib/oled_ssd1306.c
+++ b/lib/oled_ssd1306.c
@@ -42,7 +42,7 @@
 
 bool oled_ssd1306_setup(void)
 {
-	i2c_master_setup(OLED_SSD1306_I2C, true);
+	i2c_master_setup(OLED_SSD1306_I2C, 400); // setup I2C bus ( SSD1306 supports an I2C cleck up to 400 kHz)
 	const uint8_t oled_init[] = {
 		0x00, // control byte: continuous (multiple byes), command
 		0xae, // Set Display ON/OFF: OFF
@@ -65,7 +65,7 @@ bool oled_ssd1306_setup(void)
 		// Addressing Setting
 		0x20, 0x00 // Set Memory Addressing Mode: Horizontal Addressing Mode
 	}; // command to initialize the display
-	return i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, oled_init, LENGTH(oled_init)); // send command to initialize display
+	return i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_init, LENGTH(oled_init)); // send command to initialize display
 }
 
 void oled_ssd1306_on(void)
@@ -74,7 +74,7 @@ void oled_ssd1306_on(void)
 		0x80, // control byte: no continuation, command
 		0xaf, // Set Display ON/OFF: ON
 	}; // command to switch on display
-	i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, oled_display_on, LENGTH(oled_display_on)); // sent command to switch on display
+	i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_display_on, LENGTH(oled_display_on)); // sent command to switch on display
 }
 
 void oled_ssd1306_off(void)
@@ -83,7 +83,7 @@ void oled_ssd1306_off(void)
 		0x80, // control byte: no continuation, command
 		0xae, // Set Display ON/OFF: OFF
 	}; // command to switch off display
-	i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, oled_display_off, LENGTH(oled_display_off)); // sent command to switch onff display
+	i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_display_off, LENGTH(oled_display_off)); // sent command to switch onff display
 }
 
 void oled_ssd1306_test(void)
@@ -92,7 +92,7 @@ void oled_ssd1306_test(void)
 		0x80, // control byte: no continuation, command
 		0xa5 // Entire Display ON: Entire display ON Output ignores RAM content
 	}; // command to set entire display on
-	i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, oled_entire_display_on, LENGTH(oled_entire_display_on)); // send command to switch entire display on
+	i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_entire_display_on, LENGTH(oled_entire_display_on)); // send command to switch entire display on
 	oled_ssd1306_on(); // set display on
 	sleep_ms(200); // let is on for a bit (enough for the user to see it is completely on
 	oled_ssd1306_off(); // set display off
@@ -100,7 +100,7 @@ void oled_ssd1306_test(void)
 		0x80, // control byte: no continuation, command
 		0xa4 // Entire Display ON: Resume to RAM content display
 	}; // command to display RAM
-	i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, oled_entire_display_ram, LENGTH(oled_entire_display_ram)); // send command to display RAM
+	i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_entire_display_ram, LENGTH(oled_entire_display_ram)); // send command to display RAM
 }
 
 void oled_ssd1306_display(const uint8_t* display_data, uint16_t display_length)
@@ -116,11 +116,11 @@ void oled_ssd1306_display(const uint8_t* display_data, uint16_t display_length)
 		0x00, // Set Lower Column Start Address for Page Addressing Mode: 0
 		0x10 // Set Higher Column Start Address for Page Addressing Mode: 0
 	}; // command to set addressing mode
-	i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, oled_start_page, LENGTH(oled_start_page)); // send command to set addressing mode
+	i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_start_page, LENGTH(oled_start_page)); // send command to set addressing mode
 	if (!i2c_master_start(OLED_SSD1306_I2C)) { // send start condition
 		return;
 	}
-	if (!i2c_master_select_slave(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, true)) { // select OLED display
+	if (!i2c_master_select_slave(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, true)) { // select OLED display
 		return;
 	}
 	const uint8_t oled_data[] = {