Adding a getClockDivider function (espressif#1355)

* Adding getClockDivider function

* indentation correction

Author: BuzzRage

libraries/SPI/src/SPI.cpp

@@ -31,7 +31,7 @@ SPIClass::SPIClass(uint8_t spi_bus)
     ,_ss(-1)
     ,_div(0)
     ,_freq(1000000)
-    , _inTransaction(false)
+    ,_inTransaction(false)
 {}
 
 void SPIClass::begin(int8_t sck, int8_t miso, int8_t mosi, int8_t ss)
@@ -109,6 +109,11 @@ void SPIClass::setClockDivider(uint32_t clockDiv)
     spiSetClockDiv(_spi, _div);
 }
 
+uint32_t SPIClass::getClockDivider()
+{
+    return spiGetClockDiv(_spi);
+}
+
 void SPIClass::setDataMode(uint8_t dataMode)
 {
     spiSetDataMode(_spi, dataMode);

libraries/SPI/src/SPI.h

@@ -60,6 +60,8 @@ class SPIClass
     void setDataMode(uint8_t dataMode);
     void setFrequency(uint32_t freq);
     void setClockDivider(uint32_t clockDiv);
+    
+    uint32_t getClockDivider();
 
     void beginTransaction(SPISettings settings);
     void endTransaction(void);