From 731704eaac622dd7cdd12b6ba54092d9604b3f1a Mon Sep 17 00:00:00 2001
From: Brendan Le Foll <brendan.le.foll@intel.com>
Date: Mon, 14 Jul 2014 15:25:12 +0100
Subject: [PATCH] Jhd1313m1: add basic scroll functionality

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
---
 src/lcd/i2clcd.h      | 5 +++++
 src/lcd/jhd1313m1.cxx | 8 ++++++++
 src/lcd/jhd1313m1.h   | 1 +
 3 files changed, 14 insertions(+)

diff --git a/src/lcd/i2clcd.h b/src/lcd/i2clcd.h
index 460a2c41..d7ec3eaf 100644
--- a/src/lcd/i2clcd.h
+++ b/src/lcd/i2clcd.h
@@ -55,6 +55,11 @@ namespace upm {
 #define LCD_BLINKON 0x01
 #define LCD_BLINKOFF 0x00
 
+// flags for display/cursor shift
+#define LCD_DISPLAYMOVE 0x08
+#define LCD_MOVERIGHT 0x04
+#define LCD_MOVELEFT 0x00
+
 // flags for function set
 #define LCD_8BITMODE 0x10
 #define LCD_4BITMODE 0x00
diff --git a/src/lcd/jhd1313m1.cxx b/src/lcd/jhd1313m1.cxx
index d2f3aeb7..5f094f8a 100644
--- a/src/lcd/jhd1313m1.cxx
+++ b/src/lcd/jhd1313m1.cxx
@@ -84,6 +84,14 @@ Jhd1313m1::setColor(uint8_t r, uint8_t g, uint8_t b)
     return MRAA_SUCCESS;
 }
 
+mraa_result_t
+Jhd1313m1::scroll(bool direction)
+{
+    if (direction)
+        return i2Cmd (m_i2c_lcd_control, (LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT));
+    return i2Cmd (m_i2c_lcd_control, (LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT));
+}
+
 /*
  * **************
  *  virtual area
diff --git a/src/lcd/jhd1313m1.h b/src/lcd/jhd1313m1.h
index 5d637ca5..4c49f9be 100644
--- a/src/lcd/jhd1313m1.h
+++ b/src/lcd/jhd1313m1.h
@@ -37,6 +37,7 @@ class Jhd1313m1 : public I2CLcd {
         mraa_result_t setCursor (int row, int column);
         mraa_result_t clear ();
         mraa_result_t home ();
+        mraa_result_t scroll (bool direction);
 
     private:
         int m_rgb_address;