Use spi_transfer instead of spi_send

To be inline with https://www.arduino.cc/en/Reference/SPITransfer
"In case of buffer transfers the received data is stored in the buffer
in-place (the old data is replaced with the data received)."

Signed-off-by: Frederic.Pillon <[email protected]>

Author: fpistm

libraries/SPI/SPI.cpp

@@ -234,7 +234,7 @@ void SPIClass::transfer(uint8_t _pin, void *_buf, size_t _count, SPITransferMode
   if((_pin != BOARD_SPI_OWN_SS) && (_spi.pin_ssel == NC))
     digitalWrite(_pin, LOW);
 
-  spi_send(&_spi,(uint8_t *)_buf, _count,10000);
+  spi_transfer(&_spi, ((uint8_t*)_buf), ((uint8_t*)_buf), _count, 10000);
 
   if((_pin != BOARD_SPI_OWN_SS) && (_mode == SPI_LAST) && (_spi.pin_ssel == NC))
     digitalWrite(_pin, HIGH);