From 77451d6ec9c4c8ce014704214aa98252a37f3d76 Mon Sep 17 00:00:00 2001
From: david gauchard <gauchard@laas.fr>
Date: Sat, 6 Apr 2019 01:13:09 +0200
Subject: [PATCH] Hardware SPI BREAKING: unswap mode 2 and 3 for portability
 (#5948)

* Hardware SPI BREAKING: unswap mode 2 and 3 for portability
use SPI.restoreEsp8266LegacyMode2And3() for former behaviour
---
 libraries/SPI/SPI.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libraries/SPI/SPI.cpp b/libraries/SPI/SPI.cpp
index f67c6d69fc..09336266c4 100644
--- a/libraries/SPI/SPI.cpp
+++ b/libraries/SPI/SPI.cpp
@@ -161,6 +161,11 @@ void SPIClass::setDataMode(uint8_t dataMode) {
     bool CPOL = (dataMode & 0x10); ///< CPOL (Clock Polarity)
     bool CPHA = (dataMode & 0x01); ///< CPHA (Clock Phase)
 
+    // https://github.com/esp8266/Arduino/issues/2416
+    // https://github.com/esp8266/Arduino/pull/2418
+    if(CPOL)          // Ensure same behavior as
+        CPHA ^= 1;    // SAM, AVR and Intel Boards
+
     if(CPHA) {
         SPI1U |= (SPIUSME);
     } else {