From 040109e17b511253b2e3d8d92c67698a3d45ac18 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Sun, 11 Apr 2021 18:54:17 +0200
Subject: ssd1306: Add setContrast and setInvert methods

---
 include/driver/ssd1306.h |  4 +++-
 src/driver/ssd1306.cc    | 11 +++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/include/driver/ssd1306.h b/include/driver/ssd1306.h
index 4a2cf01..2afcb86 100644
--- a/include/driver/ssd1306.h
+++ b/include/driver/ssd1306.h
@@ -56,7 +56,7 @@ class SSD1306 {
 			SSD1306_SET_DISP_CLK_DIV, 0x80,
 			SSD1306_SET_PRECHARGE, 0xf1,
 			SSD1306_SET_VCOM_DESEL, 0x30,
-			SSD1306_SET_CONTRAST, 0xff,
+			SSD1306_SET_CONTRAST, 0x7f,
 			SSD1306_SET_ENTIRE_ON,
 			SSD1306_SET_NORM_INV,
 			SSD1306_SET_CHARGE_PUMP, 0x14,
@@ -70,6 +70,8 @@ class SSD1306 {
 		SSD1306() {}
 
 		void init();
+		void setContrast(unsigned char contrast);
+		void setInvert(bool invert);
 		void showImage(unsigned char* data, uint16_t length);
 };
 
diff --git a/src/driver/ssd1306.cc b/src/driver/ssd1306.cc
index 69bd28c..23b938d 100644
--- a/src/driver/ssd1306.cc
+++ b/src/driver/ssd1306.cc
@@ -30,6 +30,17 @@ void SSD1306::init()
 	}
 }
 
+void SSD1306::setContrast(unsigned char contrast)
+{
+	writeCommand(SSD1306_SET_CONTRAST);
+	writeCommand(contrast);
+}
+
+void SSD1306::setInvert(bool invert)
+{
+	writeCommand(SSD1306_SET_NORM_INV | invert);
+}
+
 void SSD1306::showImage(unsigned char* data, uint16_t length)
 {
 	uint8_t i;
-- 
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