diff --git a/configs/sam3u-ek/src/up_spi.c b/configs/sam3u-ek/src/up_spi.c
index 3b5089238b0..5c70a5ab536 100644
--- a/configs/sam3u-ek/src/up_spi.c
+++ b/configs/sam3u-ek/src/up_spi.c
@@ -134,18 +134,21 @@ void weak_function sam3u_spiinitialize(void)
  ****************************************************************************/
 
 #ifdef CONFIG_SAM3U_SPI
-void sam3u_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
+int sam3u_spiselect(enum spi_dev_e devid)
 {
-  spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
+  int cs = -EINVAL;
 
 #if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_ADS7843E)
   if (devid == SPIDEV_TOUCHSCREEN)
     {
       /* Assert the CS pin to the OLED display */
 
-      (void)lpc17_gpiowrite(GPIO_TSC_NPCS2, !selected);
+	  cs = 2;
     }
 #endif
+
+  spidbg("devid: %d CS: %d\n", (int)devid, cs);
+  return cs;
 }
 
 uint8_t sam3u_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
diff --git a/configs/sam3u-ek/src/up_touchscreen.c b/configs/sam3u-ek/src/up_touchscreen.c
index 2d4b2ef18fa..40dd2db15b0 100755
--- a/configs/sam3u-ek/src/up_touchscreen.c
+++ b/configs/sam3u-ek/src/up_touchscreen.c
@@ -50,11 +50,21 @@
 #include <nuttx/input/ads7843e.h>
 
 #include "sam3u_internal.h"
-#include "sam3uek_internal.h.h"
+#include "sam3uek_internal.h"
 
 /****************************************************************************
  * Pre-Processor Definitions
  ****************************************************************************/
+/* Configuration ************************************************************/
+
+#ifdef CONFIG_INPUT_ADS7843E
+#ifndef CONFIG_INPUT
+#  error "Touchscreen support requires CONFIG_INPUT"
+#endif
+
+#ifndef CONFIG_SAM3U_SPI
+#  error "Touchscreen support requires CONFIG_SAM3U_SPI"
+#endif
 
 /****************************************************************************
  * Static Function Prototypes
@@ -150,7 +160,6 @@ static bool tsc_pendown(FAR struct ads7843e_config_s *state)
 
   return sam3u_gpioread(GPIO_ADS7843E);
 }
-#endif /* HAVE_TOUCHSCREEN */
 
 /****************************************************************************
  * Public Functions
@@ -195,3 +204,4 @@ int up_tcinitialize(void)
 
   return OK;
 }
+#endif /* CONFIG_INPUT_ADS7843E */
\ No newline at end of file
diff --git a/configs/sam3u-ek/touchscreen/defconfig b/configs/sam3u-ek/touchscreen/defconfig
index f1692919374..4ce1dea24ae 100755
--- a/configs/sam3u-ek/touchscreen/defconfig
+++ b/configs/sam3u-ek/touchscreen/defconfig
@@ -322,7 +322,7 @@ CONFIG_SEM_NNESTPRIO=0
 CONFIG_FDCLONE_DISABLE=n
 CONFIG_FDCLONE_STDIO=n
 CONFIG_SDCLONE_DISABLE=y
-CONFIG_SCHED_WORKQUEUE=n
+CONFIG_SCHED_WORKQUEUE=y
 CONFIG_SCHED_WORKPRIORITY=50
 CONFIG_SCHED_WORKPERIOD=(50*1000)
 CONFIG_SCHED_WORKSTACKSIZE=1024