From db64fd9f98523e10e99c19c1d89dae6091148196 Mon Sep 17 00:00:00 2001
From: Markus Sattler <help.markus+git@gmail.com>
Date: Fri, 8 May 2015 15:27:32 +0200
Subject: [PATCH] fix SPI run on system clock

---
 hardware/esp8266com/esp8266/libraries/SPI/SPI.cpp | 6 +++++-
 libraries/Adafruit_ILI9341/Adafruit_ILI9341.cpp   | 2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/hardware/esp8266com/esp8266/libraries/SPI/SPI.cpp b/hardware/esp8266com/esp8266/libraries/SPI/SPI.cpp
index 2523e689f..740401c3a 100644
--- a/hardware/esp8266com/esp8266/libraries/SPI/SPI.cpp
+++ b/hardware/esp8266com/esp8266/libraries/SPI/SPI.cpp
@@ -43,7 +43,6 @@ void SPIClass::begin() {
     pinMode(MISO, SPECIAL); ///< GPIO12
     pinMode(MOSI, SPECIAL); ///< GPIO13
 
-    GPMUX = 0x105; // note crash if SPI flash Frequency < 40MHz
     SPI1C = 0;
     setFrequency(1000000); ///< 1MHz
     SPI1U = SPIUMOSI | SPIUDUPLEX | SPIUSSE;
@@ -187,6 +186,11 @@ void SPIClass::setFrequency(uint32_t freq) {
 }
 
 void SPIClass::setClockDivider(uint32_t clockDiv) {
+    if(clockDiv == 0x80000000) {
+        GPMUX |= (1 << 9); // Set bit 9 if sysclock required
+    } else {
+        GPMUX &= ~(1 << 9);
+    }
     SPI1CLK = clockDiv;
 }
 
diff --git a/libraries/Adafruit_ILI9341/Adafruit_ILI9341.cpp b/libraries/Adafruit_ILI9341/Adafruit_ILI9341.cpp
index cae7632fb..c6be8c177 100644
--- a/libraries/Adafruit_ILI9341/Adafruit_ILI9341.cpp
+++ b/libraries/Adafruit_ILI9341/Adafruit_ILI9341.cpp
@@ -153,7 +153,7 @@ void Adafruit_ILI9341::writedata(uint8_t c) {
 static inline void spi_begin(void) __attribute__((always_inline));
 static inline void spi_begin(void) {
 #ifdef ESP8266
-  SPI.beginTransaction(SPISettings(40000000, MSBFIRST, SPI_MODE0));
+  SPI.beginTransaction(SPISettings(80000000, MSBFIRST, SPI_MODE0));
 #else
   SPI.beginTransaction(SPISettings(8000000, MSBFIRST, SPI_MODE0));
 #endif