From 58ec84eb6f46defdead60fb72dd36b0725f0ec67 Mon Sep 17 00:00:00 2001
From: KTOWN <contact@microbuilder.eu>
Date: Tue, 8 Oct 2013 18:25:51 +0200
Subject: [PATCH] HW Lines

---
 Adafruit_RA8875.cpp | 48 +++++++++++++++++++++++++++++++++++++++++++++
 Adafruit_RA8875.h   |  2 +-
 2 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/Adafruit_RA8875.cpp b/Adafruit_RA8875.cpp
index 2069c59..7e808d4 100644
--- a/Adafruit_RA8875.cpp
+++ b/Adafruit_RA8875.cpp
@@ -194,6 +194,54 @@ void Adafruit_RA8875::drawPixel(int16_t x, int16_t y, uint16_t color)
   digitalWrite(_cs, HIGH);
 }
 
+void Adafruit_RA8875::drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color)
+{
+  /* Set X */
+  writeCommand(0x91);
+  writeData(x0);
+  writeCommand(0x92);
+  writeData(x0 >> 8);
+  
+  /* Set Y */
+  writeCommand(0x93);
+  writeData(y0); 
+  writeCommand(0x94);
+  writeData(y0 >> 8);
+  
+  /* Set X1 */
+  writeCommand(0x95);
+  writeData(x1);
+  writeCommand(0x96);
+  writeData((x1) >> 8);
+  
+  /* Set Y1 */
+  writeCommand(0x97);
+  writeData(y1); 
+  writeCommand(0x98);
+  writeData((y1) >> 8);
+  
+  /* Set Color */
+  writeCommand(0x63);
+  writeData((color & 0xf800) >> 11);
+  writeCommand(0x64);
+  writeData((color & 0x07e0) >> 5);
+  writeCommand(0x65);
+  writeData((color & 0x001f));
+
+  /* Draw! */
+  writeCommand(RA8875_DCR);
+  writeData(0x80);
+  
+  /* Wait for the command to finish */
+  bool finished = false;
+  while (!finished)
+  {
+    uint8_t temp = readReg(RA8875_DCR);
+    if (!(temp & RA8875_DCR_LINESQUTRI_STATUS))
+      finished = true;
+  }  
+}
+
 void Adafruit_RA8875::drawRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color)
 {
   rectHelper(x, y, x+w, y+h, color, false);
diff --git a/Adafruit_RA8875.h b/Adafruit_RA8875.h
index 47ca657..569fdc3 100644
--- a/Adafruit_RA8875.h
+++ b/Adafruit_RA8875.h
@@ -30,7 +30,7 @@ class Adafruit_RA8875 : public Adafruit_GFX {
 
   /* Adafruit_GFX functions */
   void    drawPixel(int16_t x, int16_t y, uint16_t color);
-  //void    drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color);
+  void    drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color);
   //void    drawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color);
   //void    drawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color);
   void    drawRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color);