Small changes allowing the use of C++11 std::function. (#1353)

* Small changes allowing the use of C++11 std::function.

Sming/Libraries/ArduCAM/ArduCAMStream.cpp

@@ -99,7 +99,7 @@ uint16_t ArduCAMStream::readMemoryBlock(char* data, int bufSize) {
 
 	}
 
-	int bytesread = min(len, bufSize);
+	int bytesread = min(len, (unsigned int)bufSize);
 
 	ACAM_DEBUG("ArduCAMStream::readMemoryBlock [%d] (%d bytes) remaining (%d bytes)\n", bcount++, bytesread, len);
 

Sming/Libraries/I2Cdev/I2Cdev.cpp

@@ -273,7 +273,7 @@ int8_t I2Cdev::readBytes(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint8
             // I2C/TWI subsystem uses internal buffer that breaks with large data requests
             // so if user requests more than BUFFER_LENGTH bytes, we have to do it in
             // smaller chunks instead of all at once
-            for (uint8_t k = 0; k < length; k += min(length, BUFFER_LENGTH)) {
+            for (uint8_t k = 0; k < length; k += min((unsigned int)length, (unsigned int)BUFFER_LENGTH)) {
                 Wire.beginTransmission(devAddr);
                 Wire.write(regAddr);
                 Wire.endTransmission();

Sming/SmingCore/SPI.cpp

@@ -197,7 +197,7 @@ void SPIClass::transfer(uint8 *buffer, size_t numberBytes) {
 	while  (blocks--) {
 
 		// get full BLOCKSIZE or number of remaining bytes
-		bufLenght = min(numberBytes-bufIndx, BLOCKSIZE);
+		bufLenght = min(numberBytes-bufIndx, (unsigned int)BLOCKSIZE);
 
 #ifdef SPI_DEBUG
 		debugf("Write/Read Block %d total %d bytes", total-blocks, bufLenght);

Sming/SmingCore/SmingCore.h

@@ -10,6 +10,11 @@
 
 #define SMING_VERSION "3.5.1" // Major Minor Sub
 
+#include <functional>
+
+#define min(A, B) std::min(A, B)
+#define max(A, B) std::max(A, B)
+
 #include "../Wiring/WiringFrameworkIncludes.h"
 
 #include "Delegate.h"

Sming/Wiring/WConstants.h

@@ -114,8 +114,12 @@
 
 #define sq(x)                          ((x)*(x))
 //#define abs(x)                         ((x)>0?(x):-(x))
+#ifndef min
 #define min(a,b)                       ((a)<(b)?(a):(b))
+#endif
+#ifndef max
 #define max(a,b)                       ((a)>(b)?(a):(b))
+#endif
 //#define round(x)                       ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))
 #define radians(deg)                   ((deg)*DEG_TO_RAD)
 #define degrees(rad)                   ((rad)*RAD_TO_DEG)

Sming/appinit/user_main.cpp

@@ -68,3 +68,10 @@ extern "C" uint32 ICACHE_FLASH_ATTR  __attribute__((weak)) user_rf_cal_sector_se
 
     return rf_cal_sec;
 }
+
+namespace std {
+    void __attribute__((weak)) __throw_bad_function_call()
+    {
+        while(1);
+    };
+}