From c07b86476adc7dff8c9d31d6400aac5130367dc4 Mon Sep 17 00:00:00 2001
From: Scott Allen <scotta_ym@yahoo.ca>
Date: Sat, 16 Aug 2014 22:58:28 -0400
Subject: [PATCH] Add uView.scrollLeft() function. Same as existing
 uView.scrollRight() but in the opposite direction.

---
 MicroView.cpp | 15 ++++++++++++++-
 MicroView.h   |  2 +-
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/MicroView.cpp b/MicroView.cpp
index eaf7b9a..2b55a2f 100644
--- a/MicroView.cpp
+++ b/MicroView.cpp
@@ -858,13 +858,26 @@ void MicroView::scrollStop(void){
 */
 void MicroView::scrollRight(uint8_t start, uint8_t stop){
 	if (stop<start)		// stop must be larger or equal to start
-	return;
+		return;
 	scrollStop();		// need to disable scrolling before starting to avoid memory corrupt
 	command(RIGHTHORIZONTALSCROLL, 0);
 	command(start, 0x7, stop);	// scroll speed frames , TODO
 	command(0x00, 0xFF, ACTIVATESCROLL);
 }
 
+/** \brief Left scrolling.
+
+	Set row start to row stop on the OLED to scroll left. Refer to http://learn.microview.io/intro/general-overview-of-microview.html for explanation of the rows.
+*/
+void MicroView::scrollLeft(uint8_t start, uint8_t stop){
+	if (stop<start)		// stop must be larger or equal to start
+		return;
+	scrollStop();		// need to disable scrolling before starting to avoid memory corrupt
+	command(LEFTHORIZONTALSCROLL, 0);
+	command(start, 0x7, stop);	// scroll speed frames , TODO
+	command(0x00, 0xFF, ACTIVATESCROLL);
+}
+
 /** \brief Vertical flip.
 
 	Flip the graphics on the OLED vertically.
diff --git a/MicroView.h b/MicroView.h
index f994e11..5a4de77 100644
--- a/MicroView.h
+++ b/MicroView.h
@@ -114,7 +114,7 @@
 #define DEACTIVATESCROLL 				0x2E
 #define SETVERTICALSCROLLAREA 			0xA3
 #define RIGHTHORIZONTALSCROLL 			0x26
-#define LEFT_HORIZONTALSCROLL 			0x27
+#define LEFTHORIZONTALSCROLL 			0x27
 #define VERTICALRIGHTHORIZONTALSCROLL	0x29
 #define VERTICALLEFTHORIZONTALSCROLL	0x2A