comment out AM_HAL_IOM_FULLDUPLEX usage

The full duplex direction enumeration was removed in SDK 2.4.2. Need to find out if this functionality is still supported or not.

Author: oclyke

libraries/SPI/src/SPI.cpp

@@ -291,12 +291,13 @@ void SPIClass::_transfer(void *buf_out, void *buf_in, size_t count)
   iomTransfer.pui32TxBuffer = (uint32_t *)buf_out; // todo: does this have the proper lifetime?
   iomTransfer.pui32RxBuffer = (uint32_t *)buf_in;
 
-  // Determine direction
-  if ((buf_out != NULL) && (buf_in != NULL))
-  {
-    iomTransfer.eDirection = AM_HAL_IOM_FULLDUPLEX;
-  }
-  else if (buf_out != NULL)
+  // // Determine direction
+  // if ((buf_out != NULL) && (buf_in != NULL))
+  // {
+  //   iomTransfer.eDirection = AM_HAL_IOM_FULLDUPLEX;
+  // }
+  // else 
+  if (buf_out != NULL)
   {
     iomTransfer.eDirection = AM_HAL_IOM_TX;
   }
@@ -306,14 +307,14 @@ void SPIClass::_transfer(void *buf_out, void *buf_in, size_t count)
   }
 
   uint32_t retVal32 = 0;
-  if (iomTransfer.eDirection == AM_HAL_IOM_FULLDUPLEX)
-  {
-    retVal32 = am_hal_iom_spi_blocking_fullduplex(_handle, &iomTransfer);
-  }
-  else
-  {
+  // if (iomTransfer.eDirection == AM_HAL_IOM_FULLDUPLEX)
+  // {
+  //   retVal32 = am_hal_iom_spi_blocking_fullduplex(_handle, &iomTransfer);
+  // }
+  // else
+  // {
     retVal32 = am_hal_iom_blocking_transfer(_handle, &iomTransfer);
-  }
+  // }
 
   // if (retVal32 != 0)
   // {