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diff --git a/nuttx/configs/sam4l-xplained/src/sam_spi.c b/nuttx/configs/sam4l-xplained/src/sam_spi.c
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+++ b/nuttx/configs/sam4l-xplained/src/sam_spi.c
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+/************************************************************************************
+ * configs/sam4l-xplained/src/sam_spi.c
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/spi.h>
+
+#include "sam_gpio.h"
+#include "sam_spi.h"
+#include "sam4l-xplained.h"
+
+#ifdef CONFIG_SAM34_SPI
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+
+/* Enables debug output from this file (needs CONFIG_DEBUG too) */
+
+#undef SPI_DEBUG   /* Define to enable debug */
+#undef SPI_VERBOSE /* Define to enable verbose debug */
+
+#ifdef SPI_DEBUG
+#  define spidbg  lldbg
+#  ifdef SPI_VERBOSE
+#    define spivdbg lldbg
+#  else
+#    define spivdbg(x...)
+#  endif
+#else
+#  undef SPI_VERBOSE
+#  define spidbg(x...)
+#  define spivdbg(x...)
+#endif
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: sam_spiinitialize
+ *
+ * Description:
+ *   Called to configure SPI chip select GPIO pins for the SAM3U10E-EVAL board.
+ *
+ ************************************************************************************/
+
+void weak_function sam_spiinitialize(void)
+{
+  /* The ZigBee module connects used NPCS0.  However, there is not yet any
+   * ZigBee support.
+   */
+
+   /* The touchscreen connects using NPCS2 (PC14). */
+
+#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_ADS7843E)
+   sam_configgpio(GPIO_TSC_NPCS2);
+#endif
+}
+
+/****************************************************************************
+ * Name:  sam_spicsnumber, sam_spiselect, sam_spistatus, and sam_spicmddata
+ *
+ * Description:
+ *   These external functions must be provided by board-specific logic.  They
+ *   include:
+ *
+ *   o sam_spicsnumber and sam_spiselect which are helper functions to
+ *     manage the board-specific aspects of the unique SAM3U chip select
+ *     architecture.
+ *   o sam_spistatus and sam_spicmddata:  Implementations of the status
+ *     and cmddata methods of the SPI interface defined by struct spi_ops_
+ *     (see include/nuttx/spi.h). All other methods including
+ *     up_spiinitialize()) are provided by common SAM3U logic.
+ *
+ *  To use this common SPI logic on your board:
+ *
+ *   1. Provide logic in sam_boardinitialize() to configure SPI chip select
+ *      pins.
+ *   2. Provide sam_spicsnumber(), sam_spiselect() and sam_spistatus()
+ *      functions in your board-specific logic.  These functions will perform
+ *      chip selection and status operations using GPIOs in the way your board
+ *      is configured.
+ *   2. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide
+ *      sam_spicmddata() functions in your board-specific logic.  This
+ *      function will perform cmd/data selection operations using GPIOs in
+ *      the way your board is configured.
+ *   3. Add a call to up_spiinitialize() in your low level application
+ *      initialization logic
+ *   4. The handle returned by up_spiinitialize() may then be used to bind the
+ *      SPI driver to higher level logic (e.g., calling
+ *      mmcsd_spislotinitialize(), for example, will bind the SPI driver to
+ *      the SPI MMC/SD driver).
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_spicsnumber
+ *
+ * Description:
+ *   The SAM3U has 4 CS registers for controlling device features.  This
+ *   function must be provided by board-specific code.  Given a logical device
+ *   ID, this function returns a number from 0 to 3 that identifies one of
+ *   these SAM3U CS resources.
+ *
+ * Input Parameters:
+ *   devid - Identifies the (logical) device
+ *
+ * Returned Values:
+ *   On success, a CS number from 0 to 3 is returned; A negated errno may
+ *   be returned on a failure.
+ *
+ ****************************************************************************/
+
+int sam_spicsnumber(enum spi_dev_e devid)
+{
+  int cs = -EINVAL;
+
+#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_ADS7843E)
+  if (devid == SPIDEV_TOUCHSCREEN)
+    {
+      /* Assert the CS pin to the OLED display */
+
+      cs = 2;
+    }
+#endif
+
+  spidbg("devid: %d CS: %d\n", (int)devid, cs);
+  return cs;
+}
+
+/****************************************************************************
+ * Name: sam_spiselect
+ *
+ * Description:
+ *   PIO chip select pins may be programmed by the board specific logic in
+ *   one of two different ways.  First, the pins may be programmed as SPI
+ *   peripherals.  In that case, the pins are completely controlled by the
+ *   SPI driver.  This method still needs to be provided, but it may be only
+ *   a stub.
+ *
+ *   An alternative way to program the PIO chip select pins is as a normal
+ *   GPIO output.  In that case, the automatic control of the CS pins is
+ *   bypassed and this function must provide control of the chip select.
+ *   NOTE:  In this case, the GPIO output pin does *not* have to be the
+ *   same as the NPCS pin normal associated with the chip select number.
+ *
+ * Input Parameters:
+ *   devid - Identifies the (logical) device
+ *   selected - TRUE:Select the device, FALSE:De-select the device
+ *
+ * Returned Values:
+ *   None
+ *
+ ****************************************************************************/
+
+void sam_spiselect(enum spi_dev_e devid, bool selected)
+{
+  /* The touchscreen chip select is implemented as a GPIO OUTPUT that must
+   * be controlled by this function.  This is because the ADS7843E driver
+   * must be able to sample the device BUSY GPIO input between SPI transfers.
+   * However, the AD7843E will tri-state the BUSY input whenever the chip
+   * select is de-asserted.  So the only option is to control the chip select
+   * manually and hold it low throughout the SPI transfer.
+   */
+
+#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_ADS7843E)
+  if (devid == SPIDEV_TOUCHSCREEN)
+    {
+      sam_gpiowrite(GPIO_TSC_NPCS2, !selected);
+    }
+#endif
+}
+
+/****************************************************************************
+ * Name: sam_spistatus
+ *
+ * Description:
+ *   Return status information associated with the SPI device.
+ *
+ * Input Parameters:
+ *   devid - Identifies the (logical) device
+ *
+ * Returned Values:
+ *   Bit-encoded SPI status (see include/nuttx/spi.h.
+ *
+ ****************************************************************************/
+
+uint8_t sam_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
+{
+  return 0;
+}
+
+#endif /* CONFIG_SAM34_SPI */