diff --git a/arch/arm/src/lpc17xx/lpc17_ohciram.h b/arch/arm/src/lpc17xx/lpc17_ohciram.h
index 453c55d7a1..431a8d8d32 100755
--- a/arch/arm/src/lpc17xx/lpc17_ohciram.h
+++ b/arch/arm/src/lpc17xx/lpc17_ohciram.h
@@ -127,7 +127,7 @@
 
 /* Derived size of user endpoint descriptor (ED) memory. */
 
-#define LPC17_FREEED_SIZE (CONFIG_USBHOST_NEDS * LPC17_ED_SIZE)
+#define LPC17_EDFREE_SIZE (CONFIG_USBHOST_NEDS * LPC17_ED_SIZE)
 
 /* Configurable number of descriptor buffer (TDBUFFER) */
 
@@ -170,7 +170,7 @@
  *
  *  Sizes of things
  *    CONFIG_USBHOST_NEDS         2
- *    LPC17_FREEED_SIZE           48
+ *    LPC17_EDFREE_SIZE           48
  *    LPC17_TDBUFFER_SIZE         128
  *    LPC17_TDBUFFER_SIZE         512
  *
@@ -185,7 +185,7 @@
  *    LPC17_TDHEAD_ADDR           0x2000bd00
  *    LPC17_TDTAIL_ADDR           0x2000bd10
  *    LPC17_EDCTRL_ADDR           0x2000bd20
- *    LPC17_FREEED_BASE           0x2000bd30
+ *    LPC17_EDFREE_BASE           0x2000bd30
  *    LPC17_TDBUFFER_BASE         0x2000bd50
  *    LPC17_IOBUFFER_BASE         0x2000bdd0
  *    LPC17_IOBUFFERS            (0x2000c000 + 0x2000bdd0) / 512 = 560/512 = 1
@@ -197,8 +197,8 @@
 #define LPC17_TDHEAD_ADDR   (LPC17_OHCIRAM_BASE + LPC17_HCCA_SIZE)
 #define LPC17_TDTAIL_ADDR   (LPC17_TDHEAD_ADDR + LPC17_TD_SIZE)
 #define LPC17_EDCTRL_ADDR   (LPC17_TDTAIL_ADDR + LPC17_TD_SIZE)
-#define LPC17_FREEED_BASE   (LPC17_EDCTRL_ADDR + LPC17_ED_SIZE)
-#define LPC17_TDBUFFER_BASE (LPC17_FREEED_BASE + LPC17_FREEED_SIZE)
+#define LPC17_EDFREE_BASE   (LPC17_EDCTRL_ADDR + LPC17_ED_SIZE)
+#define LPC17_TDBUFFER_BASE (LPC17_EDFREE_BASE + LPC17_EDFREE_SIZE)
 #define LPC17_IOBUFFER_BASE (LPC17_TDBUFFER_BASE + LPC17_TDBUFFER_SIZE)
 
 /* Finally, use the remainder of the allocated OHCI for IO buffers */
diff --git a/arch/arm/src/lpc17xx/lpc17_usbhost.c b/arch/arm/src/lpc17xx/lpc17_usbhost.c
index 1f6552a4af..c415794b47 100755
--- a/arch/arm/src/lpc17xx/lpc17_usbhost.c
+++ b/arch/arm/src/lpc17xx/lpc17_usbhost.c
@@ -101,10 +101,16 @@
 #define TDHEAD      ((volatile struct lpc17_hctd_s *)LPC17_TDHEAD_ADDR)
 #define TDTAIL      ((volatile struct lpc17_hctd_s *)LPC17_TDTAIL_ADDR)
 #define EDCTRL      ((volatile struct lpc17_hced_s *)LPC17_EDCTRL_ADDR)
-#define FREEEDS     ((volatile struct lpc17_hced_s *)LPC17_FREEED_BASE)
 
+#define EDFREE      ((struct lpc17_hced_s *)LPC17_EDFREE_BASE)
 #define TDBuffer    ((volatile uint8_t *)(LPC17_TDBUFFER_BASE)
 
+/* Descriptors *****************************************************************/
+
+/* TD delay interrupt value */
+
+#define TD_DELAY(n) (uint32_t)((n) << GTD_STATUS_DI_SHIFT)
+
 /* Debug ***********************************************************************/
 
 /* Trace error codes */
@@ -166,10 +172,10 @@ struct lpc17_hced_s
 
 /* The following is used manage a list of free EDs */
 
-struct lpc17_edmem_s
+struct lpc17_edlist_s
 {
-  struct lpc17_edmem_s *flink;         /* Link to next ED in the list */
-  uint32_t              pad[3];        /* To make the same size as struct lpc17_hced_s */
+  struct lpc17_edlist_s *flink;        /* Link to next ED in the list */
+  uint32_t               pad[3];       /* To make the same size as struct lpc17_hced_s */
 };
 
 /*******************************************************************************
@@ -188,6 +194,14 @@ static void lpc17_putreg(uint32_t val, uint32_t addr);
 # define lpc17_putreg(val,addr) putreg32(val,addr)
 #endif
 
+/* Descriptor helper functions *************************************************/
+
+static struct lpc17_hced_s *lpc17_edalloc(struct lpc17_usbhost_s *priv);
+static void lpc17_edfree(struct lpc17_usbhost_s *priv, struct lpc17_hced_s *ed);
+static void lpc17_enqueuetd(volatile struct lpc17_hced_s *ed, uint32_t dirpid,
+                            uint32_t toggle, volatile uint8_t *buffer,
+                            size_t buflen);
+
 /* Interrupt handling **********************************************************/
 
 static int lpc17_usbinterrupt(int irq, FAR void *context);
@@ -236,7 +250,7 @@ static struct lpc17_usbhost_s g_usbhost =
 
 /* This is a free list of EDs */
 
-static struct lpc17_edmem_s *g_freeeds;
+static struct lpc17_edlist_s *g_edfree;
 
 /*******************************************************************************
  * Public Data
@@ -368,6 +382,64 @@ static void lpc17_putreg(uint32_t val, uint32_t addr)
 }
 #endif
 
+/*******************************************************************************
+ * Name: lpc17_edalloc
+ *
+ * Description:
+ *   Allocate an ED from the free list
+ *
+ *******************************************************************************/
+
+static struct lpc17_hced_s *lpc17_edalloc(struct lpc17_usbhost_s *priv)
+{
+  struct lpc17_hced_s *ret = (struct lpc17_hced_s *)g_edfree;
+  if (ret)
+    {
+      g_edfree = ((struct lpc17_edlist_s*)ret)->flink;
+    }
+  return ret;
+}
+
+/*******************************************************************************
+ * Name: lpc17_edfree
+ *
+ * Description:
+ *   Return an ED to the free list
+ *
+ *******************************************************************************/
+
+static void lpc17_edfree(struct lpc17_usbhost_s *priv, struct lpc17_hced_s *ed)
+{
+  struct lpc17_edlist_s *edfree = (struct lpc17_edlist_s *)ed;
+  edfree->flink                 = g_edfree;
+  g_edfree                      = edfree;
+}
+
+/*******************************************************************************
+ * Name: lpc17_enqueuetd
+ *
+ * Description:
+ *   Enqueue a transfer descriptor
+ *
+ *******************************************************************************/
+
+static void lpc17_enqueuetd(volatile struct lpc17_hced_s *ed, uint32_t dirpid,
+                            uint32_t toggle, volatile uint8_t *buffer, size_t buflen)
+{
+  TDHEAD->ctrl    = (GTD_STATUS_R | dirpid | TD_DELAY(0) | toggle | GTD_STATUS_CC_MASK);
+  TDTAIL->ctrl    = 0;
+  TDHEAD->currptr = (uint32_t)buffer;
+  TDTAIL->currptr = 0;
+  TDHEAD->next    = (uint32_t)TDTAIL;
+  TDTAIL->next    = 0;
+  TDHEAD->bufend  = (uint32_t)(buffer + (buflen - 1));
+  TDTAIL->bufend  = 0;
+
+  ed->headtd      = (uint32_t)TDHEAD | ((ed->headtd) & 0x00000002);
+  ed->tailtd      = (uint32_t)TDTAIL;
+  ed->next        = 0;
+}
+
 /*******************************************************************************
  * Name: lpc17_usbinterrupt
  *
@@ -691,19 +763,13 @@ void up_usbhostinitialize(void)
   lpc17_tdinit(TDTAIL);
   lpc17_edinit(EDCTRL);
 
+  /* Initialize user-configurable EDs */
+
   for (i = 0; i < CONFIG_USBHOST_NEDS; i++)
     {
-      struct lpc17_edmem_s *freeed;
-
-      /* Initialize the ED */
-
-      lpc17_edinit(&FREEEDS[i]);
-
       /* Put the ED in a free list */
 
-      freeed        = (struct lpc17_edmem_s *)&FREEEDS[i];
-      freeed->flink = g_freeeds;
-      g_freeeds     = freeed;
+      lpc17_edfree(priv, &EDFREE[i]);
     }
 
   /* Wait 50MS then perform hardware reset */