diff --git a/os/hal/ports/AVR/XMEGA/LLD/SPIv1/driver.mk b/os/hal/ports/AVR/XMEGA/LLD/SPIv1/driver.mk
new file mode 100644
index 000000000..07d9088c3
--- /dev/null
+++ b/os/hal/ports/AVR/XMEGA/LLD/SPIv1/driver.mk
@@ -0,0 +1,9 @@
+ifeq ($(USE_SMART_BUILD),yes)
+ifneq ($(findstring HAL_USE_SPI TRUE,$(HALCONF)),)
+PLATFORMSRC += $(CHIBIOS)/os/hal/ports/AVR/XMEGA/LLD/SPIv1/hal_spi_lld.c
+endif
+else
+PLATFORMSRC += $(CHIBIOS)/os/hal/ports/AVR/XMEGA/LLD/SPIv1/hal_spi_lld.c
+endif
+
+PLATFORMINC += $(CHIBIOS)/os/hal/ports/AVR/XMEGA/LLD/SPIv1
diff --git a/os/hal/ports/AVR/XMEGA/LLD/SPIv1/hal_spi_lld.c b/os/hal/ports/AVR/XMEGA/LLD/SPIv1/hal_spi_lld.c
new file mode 100644
index 000000000..12c953a10
--- /dev/null
+++ b/os/hal/ports/AVR/XMEGA/LLD/SPIv1/hal_spi_lld.c
@@ -0,0 +1,409 @@
+/*
+    ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @file    SPIv1/hal_spi_lld.c
+ * @brief   AVR/MEGA SPI subsystem low level driver source.
+ *
+ * @addtogroup SPI
+ * @{
+ */
+
+#include "hal.h"
+
+#if HAL_USE_SPI || defined(__DOXYGEN__)
+
+/*==========================================================================*/
+/* Driver local definitions.                                                */
+/*==========================================================================*/
+
+#define DUMMY_SPI_SEND_VALUE    0xFF
+
+/*==========================================================================*/
+/* Driver exported variables.                                               */
+/*==========================================================================*/
+
+/**
+ * @brief   SPI1 driver identifier.
+ */
+#if AVR_SPI_USE_SPI1 || defined(__DOXYGEN__)
+SPIDriver SPID1;
+#endif
+
+/**
+ * @brief   SPI2 driver identifier.
+ */
+#if AVR_SPI_USE_SPI2 || defined(__DOXYGEN__)
+SPIDriver SPID2;
+#endif
+
+/*==========================================================================*/
+/* Driver local variables and types.                                        */
+/*==========================================================================*/
+
+/*==========================================================================*/
+/* Driver local functions.                                                  */
+/*==========================================================================*/
+/*
+// Configure the speed of the SPI interface.
+static void spi_set_speed(uint8_t ds) {
+  // We must make a test to see if we are in master mode.
+
+  // ds = double speed;
+  if (ds == SPI_SPEED_DOUBLE) {
+    SPIC.CTRL |= (1 << SPI_CLK2X_bp);  // double speed.
+  }
+  else {
+    SPIC.CTRL &= ~(1 << SPI_CLK2X_bp); // simple speed.
+  }
+}
+*/
+
+
+// Enable the SPI module.
+//static void spi_lld_enable(SPIDriver *spip) {
+//  spip->spi->CTRL |= (1 << SPI_ENABLE_bp);
+//}
+
+
+/*
+// Disable the SPI interface.
+static void spi_disable(void) {
+  SPIC.CTRL &= ~(1 << SPI_ENABLE_bp);
+}
+*/
+
+/*
+// Configure the SPI bit order, LSB/MSB first.
+static void spi_set_bit_order(uint8_t bo) {
+  // bo = bit order
+  if (bo == SPI_MSB_FIRST)
+    SPIC.CTRL &= ~(1 << SPI_DORD_bp);
+  else
+    SPIC.CTRL |= (1 << SPI_DORD_bp);
+}
+
+// Configure the SPI interface to Master or slave.
+static void spi_set_mode(uint8_t mode) {
+  if (mode == SPI_MODE_SLAVE)
+    SPIC.CTRL &= ~(1 << SPI_MASTER_bp);
+  else
+    SPIC.CTRL |= (1 << SPI_MASTER_bp);
+}
+
+static void spi_set_stransfer_mode(SPI_MODE_t mode) {
+  switch(mode) {
+    case SPI_TRANSFER_MODE0:
+      SPIC.CTRL = (SPIC.CTRL & ~SPI_MODE_gm) | SPI_MODE_0_gc;
+    break;
+
+    case SPI_TRANSFER_MODE1:
+      SPIC.CTRL = (SPIC.CTRL & ~SPI_MODE_gm) | SPI_MODE_1_gc;
+    break;
+    
+    case SPI_TRANSFER_MODE2:
+      SPIC.CTRL = (SPIC.CTRL & ~SPI_MODE_gm) | SPI_MODE_2_gc;
+    break;
+
+    case SPI_TRANSFER_MODE3:
+      SPIC.CTRL = (SPIC.CTRL & ~SPI_MODE_gm) | SPI_MODE_3_gc;
+    break;
+
+    default:
+      SPIC.CTRL = (SPIC.CTRL & ~SPI_MODE_gm) | SPI_MODE_0_gc;
+    break;
+  }
+}*/
+
+/**
+ * @brief   Configure the SPI colck from the System clock.
+ *
+ * @param[in] prescaler   the prescaler used to divide the system clock
+ *//*
+static void spi_set_clock_prescaler(SPI_PRESCALER_t prescaler) {
+  switch(prescaler) {
+    case SPI_PRESCALER_4:
+      SPIC.CTRL = (SPIC.CTRL & ~SPI_PRESCALER_gm) | SPI_PRESCALER_DIV4_gc;
+    break;
+
+    case SPI_PRESCALER_16:
+      SPIC.CTRL = (SPIC.CTRL & ~SPI_PRESCALER_gm) | SPI_PRESCALER_DIV4_gc;
+    break;
+    
+    case SPI_PRESCALER_64:
+      SPIC.CTRL = (SPIC.CTRL & ~SPI_PRESCALER_gm) | SPI_PRESCALER_DIV4_gc;
+    break;
+
+    case SPI_PRESCALER_128:
+      SPIC.CTRL = (SPIC.CTRL & ~SPI_PRESCALER_gm) | SPI_PRESCALER_DIV4_gc;
+    break;
+
+    default:
+    break;
+  }
+}
+*/
+
+/**
+ * @brief   Enable/Disable the interruption and set the interrupt level.
+ *
+ * @param[in] il  the interrupt level
+ */
+/*static void spi_set_irq_level(SPI_INTLVL_t il) {
+  switch(il) {
+    case SPI_INT_DISABLE:
+      SPIC.INTCTRL = (SPIC.INTCTRL & ~SPI_INTLVL_gm) | SPI_INTLVL_OFF_gc;
+    break;
+
+    case SPI_INT_LEVEL_LOW:
+      SPIC.INTCTRL = (SPIC.INTCTRL & ~SPI_INTLVL_gm) | SPI_INTLVL_LO_gc;
+    break;
+    
+    case SPI_INT_LEVEL_MEDIUM:
+      SPIC.INTCTRL = (SPIC.INTCTRL & ~SPI_INTLVL_gm) | SPI_INTLVL_MED_gc;
+    break;
+
+    case SPI_INT_LEVEL_HIGH:
+      SPIC.INTCTRL = (SPIC.INTCTRL & ~SPI_INTLVL_gm) | SPI_INTLVL_HI_gc;
+    break;
+
+    default:
+      SPIC.INTCTRL = (SPIC.INTCTRL & ~SPI_INTLVL_gm) | SPI_INTLVL_OFF_gc;
+    break;
+  }
+}
+
+
+void spi_send_byte(uint8_t data) {
+  SPIC.DATA = data;
+  while(!(SPIC.STATUS & SPI_IF_bm));
+}
+*/
+/*
+  spi_set_speed(SPI_SPEED_SIMPLE);            // Configure the speed double.
+  spi_set_bit_order(SPI_MSB_FIRST);           // Configure the bit order.
+  spi_set_mode(SPI_MODE_MASTER);              // Configure the mode to master.
+  spi_set_stransfer_mode(SPI_TRANSFER_MODE0); // Configure the transfer mode.
+  spi_set_clock_prescaler(SPI_PRESCALER_4);   // Configure the clock prescaler.
+  spi_set_irq_level(SPI_INT_LEVEL_LOW);       // Configure the irq level.
+  spi_enable();                               // Enable the SPI interface.
+
+  //spi_select();         // For the chip select. // TODO
+  spi_send_byte(0xAA);  // For the chip select.
+  //spi_deselect();       // for the chip select. // TODO
+  */
+/*==========================================================================*/
+/* Driver interrupt handlers.                                               */
+/*==========================================================================*/
+
+#if AVR_SPI_USE_SPI1 || defined(__DOXYGEN__)
+/**
+ * @brief   SPI event interrupt handler.
+ *
+ * @notapi
+ *//*
+OSAL_IRQ_HANDLER(SPI_STC_vect) {
+  OSAL_IRQ_PROLOGUE();
+
+  SPIDriver *spip = &SPID1;
+
+  // A new value has arrived, store it if we are interested in it.
+  if (spip->rxbuf) spip->rxbuf[spip->exidx] = SPDR;
+
+  // Check if we are done.
+  if (++(spip->exidx) >= spip->exbytes) {
+    _spi_isr_code(spip);
+  } else { // If not done send the next byte.
+     if (spip->txbuf) { // If there is a buffer with values to be send then use it.
+       SPDR = spip->txbuf[spip->exidx];
+    } else {            // If there isn't a buffer with values to be send then send a the dummy value.
+      SPDR = DUMMY_SPI_SEND_VALUE;
+    }
+  }
+  OSAL_IRQ_EPILOGUE();
+}*/
+#endif /* AVR_SPI_USE_SPI1 */
+
+/*==========================================================================*/
+/* Driver exported functions.                                               */
+/*==========================================================================*/
+
+/**
+ * @brief   Low level SPI driver initialization.
+ *
+ * @notapi
+ */
+void spi_lld_init(void) {
+
+#if AVR_SPI_USE_SPI1
+  /* Driver initialization. */
+  spiObjectInit(&SPID1);
+  SPID1.spi = &SPIC;
+#endif /* AVR_SPI_USE_SPI1 */
+
+#if AVR_SPI_USE_SPI2
+  /* Driver initialization. */
+  spiObjectInit(&SPID2);
+  SPID2.spi = &SPID;
+#endif /* AVR_SPI_USE_SPI2 */
+}
+
+/**
+ * @brief   Configures and activates the SPI peripheral.
+ *
+ * @param[in] spip      pointer to the @p SPIDriver object
+ *
+ * @notapi
+ */
+void spi_lld_start(SPIDriver *spip) {
+
+  uint8_t dummy;
+
+  if (&SPID1 == spip) {
+    // Configures the peripheral.
+    // Note that some bits are forced:
+	  // SPI interrupt disabled,
+	  // SPI enabled,
+	  // SPI master enabled.
+    
+    spip->spi->INTCTRL = SPI_INTLVL_OFF_gc;
+
+    spip->spi->CTRL = (spip->config->clk2x ? SPI_CLK2X_bm : 0)    |
+                      (SPI_ENABLE_bm)                             |
+                      (spip->config->dord ? SPI_DORD_bm : 0)      |
+                      (spip->config->master ? SPI_MASTER_bm : 0)  |
+                      (spip->config->mode)                        |
+                      (spip->config->prescaler);
+
+    // Dummy reads before enabling interrupt.
+    dummy = spip->spi->STATUS;
+    dummy = spip->spi->DATA;
+    (void) dummy; // Suppress warning about unused variable.
+
+    // Enable SPI interrupts.
+    spip->spi->INTCTRL = spip->config->irqlevel;
+  }
+}
+
+/**
+ * @brief   Deactivates the SPI peripheral.
+ *
+ * @param[in] spip      pointer to the @p SPIDriver object
+ *
+ * @notapi
+ */
+void spi_lld_stop(SPIDriver *spip) {
+  if (spip->state == SPI_READY) {
+    // Disable the peripheral.
+    spip->spi->CTRL &= ~(1 << SPI_ENABLE_bp);
+  }
+}
+
+/**
+ * @brief   Asserts the slave select signal and prepares for transfers.
+ *
+ * @param[in] spip      pointer to the @p SPIDriver object
+ *
+ * @notapi
+ */
+void spi_lld_select(SPIDriver *spip) {
+
+  /**
+   * NOTE: This should only be called in master mode.
+   */
+  //spip->config->ssport->out &= ~(1 << spip->config->sspad);
+
+}
+
+/**
+ * @brief   Deasserts the slave select signal.
+ * @details The previously selected peripheral is unselected.
+ *
+ * @param[in] spip      pointer to the @p SPIDriver object
+ *
+ * @notapi
+ */
+void spi_lld_unselect(SPIDriver *spip) {
+
+  /**
+   * NOTE: This should only be called in master mode.
+   */
+  //spip->config->ssport->out |= (1 << spip->config->sspad);
+
+}
+
+
+/**
+ * @brief   Exchanges data on the SPI bus.
+ * @details This asynchronous function starts a simultaneous transmit/receive
+ *          operation.
+ * @post    At the end of the operation the configured callback is invoked.
+ * @note    The buffers are organized as uint8_t arrays for data sizes below or
+ *          equal to 8 bits else it is organized as uint16_t arrays.
+ *
+ * @param[in] spip      pointer to the @p SPIDriver object
+ * @param[in] n         number of words to be exchanged
+ * @param[in] txbuf     the pointer to the transmit buffer
+ * @param[out] rxbuf    the pointer to the receive buffer
+ *
+ * @notapi
+ */
+void spi_lld_exchange(SPIDriver *spip, size_t n, const void *txbuf, void *rxbuf) {
+
+  spip->txbuf = txbuf;
+  spip->rxbuf = rxbuf;
+  spip->exidx = 0;
+  spip->exbytes = n;
+  spip->spi->DATA = (spip->txbuf ? spip->txbuf[0] : DUMMY_SPI_SEND_VALUE);
+}
+
+
+/**
+ * @brief   Exchanges one frame using a polled wait.
+ * @details This synchronous function exchanges one frame using a polled
+ *          synchronization method. This function is useful when exchanging
+ *          small amount of data on high speed channels, usually in this
+ *          situation is much more efficient just wait for completion using
+ *          polling than suspending the thread waiting for an interrupt.
+ *
+ * @param[in] spip      pointer to the @p SPIDriver object
+ * @param[in] frame     the data frame to send over the SPI bus
+ * @return              The received data frame from the SPI bus.
+ */
+uint8_t spi_lld_polled_exchange(SPIDriver *spip, uint8_t frame) {
+
+  uint8_t spdr = 0;
+  uint8_t dummy;
+  (void)spip;
+
+  // Disable interrupt.
+  spip->spi->INTCTRL = SPI_INTLVL_OFF_gc;
+
+  spip->spi->DATA = frame;
+  while (!(spip->spi->STATUS & SPI_IF_bm)) ;
+  spdr = spip->spi->DATA;
+
+  dummy = spip->spi->STATUS;
+  dummy = spip->spi->DATA;
+  (void) dummy; // Suppress warning about unused variable.
+  spip->spi->INTCTRL = SPI_INTLVL_LO_gc;
+
+  return spdr;
+}
+
+#endif /* HAL_USE_SPI */
+
+/** @} */
diff --git a/os/hal/ports/AVR/XMEGA/LLD/SPIv1/hal_spi_lld.h b/os/hal/ports/AVR/XMEGA/LLD/SPIv1/hal_spi_lld.h
new file mode 100644
index 000000000..11f806ff9
--- /dev/null
+++ b/os/hal/ports/AVR/XMEGA/LLD/SPIv1/hal_spi_lld.h
@@ -0,0 +1,309 @@
+/*
+    ChibiOS - Copyright (C) 2016..2018 Theodore Ateba
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @file    SPIv1/hal_spi_lld.h
+ * @brief   AVR/XMEGA SPI subsystem low level driver header.
+ *
+ * @addtogroup SPI
+ * @{
+ */
+
+#ifndef HAL_SPI_LLD_H
+#define HAL_SPI_LLD_H
+
+#if HAL_USE_SPI || defined(__DOXYGEN__)
+
+/*==========================================================================*/
+/* Driver constants.                                                        */
+/*==========================================================================*/
+
+/**
+ * @name SPI Configuration Register
+ * @{
+ */
+/*#define SPI_CR_SPIE              (1 << SPIE)
+
+#define SPI_CR_SPE               (1 << SPE)
+
+#define SPI_CR_DORD_MSB_FIRST    (0 << DORD)
+#define SPI_CR_DORD_LSB_FIRST    (1 << DORD)
+
+#define SPI_CR_MSTR              (1 << MSTR)
+
+#define SPI_CR_CPOL_CPHA_MODE(n) ((n) << CPHA)
+
+#define SPI_CR_SCK_FOSC_2        (0 << SPR0)
+#define SPI_CR_SCK_FOSC_4        (0 << SPR0)
+#define SPI_CR_SCK_FOSC_8        (1 << SPR0)
+#define SPI_CR_SCK_FOSC_16       (1 << SPR0)
+#define SPI_CR_SCK_FOSC_32       (2 << SPR0)
+#define SPI_CR_SCK_FOSC_64       (2 << SPR0)
+#define SPI_CR_SCK_FOSC_128      (3 << SPR0)
+*/
+
+
+#define SPI_SPEED_SIMPLE      0
+#define SPI_SPEED_DOUBLE      1
+
+#define SPI_MODE_MASTER       1
+#define SPI_MODE_SLAVE        0
+
+#define SPI_LSB_FIRST         1
+#define SPI_MSB_FIRST         0
+
+#define SPI_TRANSFER_MODE0    (0x00 << 2)
+#define SPI_TRANSFER_MODE1    (0x01 << 2)
+#define SPI_TRANSFER_MODE2    (0x02 << 2)
+#define SPI_TRANSFER_MODE3    (0x03 << 2)
+
+#define SPI_PRESCALER_4       (0x00 << 0)
+#define SPI_PRESCALER_16      (0x01 << 0)
+#define SPI_PRESCALER_64      (0x02 << 0)
+#define SPI_PRESCALER_128     (0x03 << 0)
+
+#define SPI_INT_DISABLE       (0x00 << 0)
+#define SPI_INT_LEVEL_LOW     (0x01 << 0)
+#define SPI_INT_LEVEL_MEDIUM  (0x02 << 0)
+#define SPI_INT_LEVEL_HIGH    (0x03 << 0)
+
+/** @} */
+
+/**
+ * @name SPI Status Register
+ * {
+ *//*
+#define SPI_SR_SPIF              (1 << SPIF)
+
+#define SPI_SR_WCOL              (1 << WCOL)
+
+#define SPI_SR_SCK_FOSC_2        (1 << SPI2X)
+#define SPI_SR_SCK_FOSC_4        (0 << SPI2X)
+#define SPI_SR_SCK_FOSC_8        (1 << SPI2X)
+#define SPI_SR_SCK_FOSC_16       (0 << SPI2X)
+#define SPI_SR_SCK_FOSC_32       (1 << SPI2X)
+#define SPI_SR_SCK_FOSC_64       (0 << SPI2X)
+#define SPI_SR_SCK_FOSC_128      (0 << SPI2X)
+*/
+/** @} */
+
+/*==========================================================================*/
+/* Driver pre-compile time settings.                                        */
+/*==========================================================================*/
+
+/**
+ * @name    Configuration options
+ * @{
+ */
+/**
+ * @brief   SPI driver enable switch.
+ * @details If set to @p TRUE the support for SPI1 is included.
+ */ // FIXME: Correct this define by using XMEGA insted of AVR
+#if !defined(AVR_SPI_USE_SPI1) || defined(__DOXYGEN__)
+#define AVR_SPI_USE_SPI1  FALSE
+#endif
+/** @} */
+
+/*==========================================================================*/
+/* Derived constants and error checks.                                      */
+/*==========================================================================*/
+
+/*==========================================================================*/
+/* Driver data structures and types.                                        */
+/*==========================================================================*/
+
+/**
+ * @brief   Type of a structure representing an SPI driver.
+ */
+typedef struct SPIDriver SPIDriver;
+
+/**
+ * @brief   SPI notification callback type.
+ *
+ * @param[in] spip      pointer to the @p SPIDriver object triggering the
+ *                      callback
+ */
+typedef void (*spicallback_t)(SPIDriver *spip);
+
+/**
+ * @brief   Driver configuration structure.
+ * @note    Implementations may extend this structure to contain more,
+ *          architecture dependent, fields.
+ */
+typedef struct {
+  /**
+   * @brief Operation complete callback.
+   */
+  spicallback_t         end_cb;
+  /* End of the mandatory fields. */
+  /**
+   * @brief Port used of Slave Select
+   */
+  ioportid_t            ssport;
+  /**
+   * @brief Pad used of Slave Select
+   */
+  uint8_t               sspad;
+  /**
+   * @brief SPI Control Register initialization data.
+   */
+  //uint8_t               spcr;
+
+  SPI_PRESCALER_t       prescaler;  // Clock divider
+  SPI_MODE_t            mode;       // SPI mode 1, 2, ...
+  bool                  master;     // Master or slave
+  bool                  dord;       // Data order, LSB or MSB first
+  bool                  clk2x;      // SPI double speed mode.
+  SPI_INTLVL_t          irqlevel;   // SPI interrupt service level
+} SPIConfig;
+
+/**
+ * @brief   Structure representing an SPI driver.
+ * @note    Implementations may extend this structure to contain more,
+ *          architecture dependent, fields.
+ */
+struct SPIDriver {
+  /**
+   * @brief Driver state.
+   */
+  spistate_t                state;
+  /**
+   * @brief Current configuration data.
+   */
+  const SPIConfig           *config;
+#if SPI_USE_WAIT || defined(__DOXYGEN__)
+  /**
+   * @brief Waiting thread.
+   */
+  thread_reference_t        thread;
+#endif /* SPI_USE_WAIT */
+#if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
+  /**
+   * @brief Mutex protecting the bus.
+   */
+  mutex_t                   mutex;
+#endif /* SPI_USE_MUTUAL_EXCLUSION */
+#if defined(SPI_DRIVER_EXT_FIELDS)
+  SPI_DRIVER_EXT_FIELDS
+#endif
+  /* End of the mandatory fields. */
+  /**
+   * @brief   Pointer to the SPI register module.
+   */
+  SPI_t                     *spi;
+  /**
+   * @brief   Pointer to the buffer with data to send.
+   */
+  const uint8_t             *txbuf;
+  /**
+   * @brief   Pointer to the buffer to store received data.
+   */
+  uint8_t                   *rxbuf;
+  /**
+   * @brief   Number of bytes of data to exchange.
+   */
+  size_t                    exbytes;
+  /**
+   * @brief   Current index in buffer when exchanging data.
+   */
+  size_t                    exidx;
+};
+
+/*==========================================================================*/
+/* Driver macros.                                                           */
+/*==========================================================================*/
+
+/**
+ * @brief   Ignores data on the SPI bus.
+ * @details This asynchronous function starts the transmission of a series of
+ *          idle words on the SPI bus and ignores the received data.
+ * @post    At the end of the operation the configured callback is invoked.
+ *
+ * @param[in] spip      pointer to the @p SPIDriver object
+ * @param[in] n         number of words to be ignored
+ *
+ * @notapi
+ */
+#define spi_lld_ignore(spip, n)     spi_lld_exchange(spip, n, NULL, NULL)
+
+/**
+ * @brief   Sends data over the SPI bus.
+ * @details This asynchronous function starts a transmit operation.
+ * @post    At the end of the operation the configured callback is invoked.
+ * @note    The buffers are organized as uint8_t arrays for data sizes below or
+ *          equal to 8 bits else it is organized as uint16_t arrays.
+ *
+ * @param[in] spip      pointer to the @p SPIDriver object
+ * @param[in] n         number of words to send
+ * @param[in] txbuf     the pointer to the transmit buffer
+ *
+ * @notapi
+ */
+#define spi_lld_send(spip, n, txbuf)     spi_lld_exchange(spip, n, txbuf, NULL)
+
+/**
+ * @brief   Receives data from the SPI bus.
+ * @details This asynchronous function starts a receive operation.
+ * @post    At the end of the operation the configured callback is invoked.
+ * @note    The buffers are organized as uint8_t arrays for data sizes below or
+ *          equal to 8 bits else it is organized as uint16_t arrays.
+ *
+ * @param[in] spip      pointer to the @p SPIDriver object
+ * @param[in] n         number of words to receive
+ * @param[out] rxbuf    the pointer to the receive buffer
+ *
+ * @notapi
+ */
+#define spi_lld_receive(spip, n, rxbuf)     spi_lld_exchange(spip, n, NULL, rxbuf)
+
+/*==========================================================================*/
+/* External declarations.                                                   */
+/*==========================================================================*/
+
+#if AVR_SPI_USE_SPI1 && !defined(__DOXYGEN__)
+extern SPIDriver SPID1;
+#endif
+
+#if AVR_SPI_USE_SPI2 && !defined(__DOXYGEN__)
+extern SPIDriver SPID2;
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  void spi_lld_init(void);
+  void spi_lld_start(SPIDriver *spip);
+  void spi_lld_stop(SPIDriver *spip);
+  void spi_lld_select(SPIDriver *spip);
+  void spi_lld_unselect(SPIDriver *spip);
+  void spi_lld_exchange(SPIDriver *spip, size_t n,
+                        const void *txbuf, void *rxbuf);
+
+//#if AVR_SPI_USE_16BIT_POLLED_EXCHANGE
+//  uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame);
+//#else
+  uint8_t spi_lld_polled_exchange(SPIDriver *spip, uint8_t frame);
+//#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_SPI */
+
+#endif /* HAL_SPI_LLD_H */
+
+/** @} */