From 6599a9f52a9386ff5215a268cdca663916df5f2e Mon Sep 17 00:00:00 2001
From: Markus Sattler <help.markus+git@gmail.com>
Date: Mon, 4 May 2015 18:11:46 +0200
Subject: [PATCH] add SPIClass::transfer16 (needed by some display libs)

---
 libraries/SPI/SPI.cpp | 24 +++++++++++++++++++++++-
 libraries/SPI/SPI.h   |  1 +
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/libraries/SPI/SPI.cpp b/libraries/SPI/SPI.cpp
index fefd5ce2b..347259f4d 100644
--- a/libraries/SPI/SPI.cpp
+++ b/libraries/SPI/SPI.cpp
@@ -57,7 +57,7 @@ void SPIClass::setDataMode(uint8_t dataMode) {
 }
 
 void SPIClass::setBitOrder(uint8_t bitOrder) {
-  if (bitOrder == MSBFIRST){
+  if (bitOrder == MSBFIRST) {
     SPI1C &= ~(SPICWBO | SPICRBO);
   } else {
     SPI1C |= (SPICWBO | SPICRBO);
@@ -76,3 +76,25 @@ uint8_t SPIClass::transfer(uint8_t data) {
   return (uint8_t)(SPI1W0 & 0xff);
 }
 
+uint16_t SPIClass::transfer16(uint16_t data) {
+    union {
+            uint16_t val;
+            struct {
+                    uint8_t lsb;
+                    uint8_t msb;
+            };
+    } in, out;
+    in.val = data;
+
+    if((SPI1C & (SPICWBO | SPICRBO))) {
+        //MSBFIRST
+        out.msb = transfer(in.msb);
+        out.lsb = transfer(in.lsb);
+    } else {
+        //LSBFIRST
+        out.lsb = transfer(in.lsb);
+        out.msb = transfer(in.msb);
+    }
+    return out.val;
+}
+
diff --git a/libraries/SPI/SPI.h b/libraries/SPI/SPI.h
index d62d96df3..5ff10d3a3 100644
--- a/libraries/SPI/SPI.h
+++ b/libraries/SPI/SPI.h
@@ -80,6 +80,7 @@ public:
   void setClockDivider(uint32_t clockDiv);
   void beginTransaction(SPISettings settings);
   uint8_t transfer(uint8_t data);
+  uint16_t transfer16(uint16_t data);
   void endTransaction(void);
 };