diff --git a/arch/arm/src/lm3s/lm3s_dumpgpio.c b/arch/arm/src/lm3s/lm3s_dumpgpio.c
index 766ad911b5..aed9d00e4b 100644
--- a/arch/arm/src/lm3s/lm3s_dumpgpio.c
+++ b/arch/arm/src/lm3s/lm3s_dumpgpio.c
@@ -141,7 +141,7 @@ int lm3s_dumpgpio(uint32 pinset, const char *msg)
       lldbg("  AFSEL: %02x DEN: %02x DIR: %02x DATA: %02x\n",
             getreg32(base + LM3S_GPIO_AFSEL_OFFSET), getreg32(base + LM3S_GPIO_DEN_OFFSET),
             getreg32(base + LM3S_GPIO_DIR_OFFSET), getreg32(base + LM3S_GPIO_DATA_OFFSET + 0x3fc));
-      lldbg("  IS:    %02x IBE: %02x IEV: %02x IM:  %02x RIS: %02x MIS: %02x\n",
+      lldbg("  IS:    %02x IBE: %02x IEV: %02x IM:  %02x RIS: %08x MIS: %08x\n",
             getreg32(base + LM3S_GPIO_IEV_OFFSET), getreg32(base + LM3S_GPIO_IM_OFFSET),
             getreg32(base + LM3S_GPIO_RIS_OFFSET), getreg32(base + LM3S_GPIO_MIS_OFFSET));
       lldbg("  2MA:   %02x 4MA: %02x 8MA: %02x ODR: %02x PUR %02x PDR: %02x SLR: %02x\n",
diff --git a/arch/arm/src/lm3s/lm3s_ssi.c b/arch/arm/src/lm3s/lm3s_ssi.c
index 7c91a07094..4b9386c8a3 100755
--- a/arch/arm/src/lm3s/lm3s_ssi.c
+++ b/arch/arm/src/lm3s/lm3s_ssi.c
@@ -64,7 +64,7 @@
  * CONFIG_DEBUG_VERBOSE too)
  */
 
-#undef SSI_DEBUG /* Define to enable debug */
+#undef SSI_DEBUG  /* Define to enable debug */
 
 #ifdef SSI_DEBUG
 #  define ssidbg  lldbg
@@ -426,12 +426,14 @@ static void ssi_semtake(sem_t *sem)
 
 static void ssi_txnull(struct lm32_ssidev_s *priv)
 {
+  ssivdbg("TX: ones\n");
   ssi_putreg(priv, LM3S_SSI_DR_OFFSET, 0xffff);
 }
 
 static void ssi_txuint16(struct lm32_ssidev_s *priv)
 {
   uint16 *ptr    = (uint16*)priv->txbuffer;
+  ssivdbg("TX: %p->%04x\n", ptr, *ptr);
   ssi_putreg(priv, LM3S_SSI_DR_OFFSET, (uint32)(*ptr++));
   priv->txbuffer = (void*)ptr;
 }
@@ -439,6 +441,7 @@ static void ssi_txuint16(struct lm32_ssidev_s *priv)
 static void ssi_txubyte(struct lm32_ssidev_s *priv)
 {
   ubyte *ptr     = (ubyte*)priv->txbuffer;
+  ssivdbg("TX: %p->%02x\n", ptr, *ptr);
   ssi_putreg(priv, LM3S_SSI_DR_OFFSET, (uint32)(*ptr++));
   priv->txbuffer = (void*)ptr;
 }
@@ -462,21 +465,28 @@ static void ssi_txubyte(struct lm32_ssidev_s *priv)
 
 static void ssi_rxnull(struct lm32_ssidev_s *priv)
 {
+#if defined(SSI_DEBUG) && defined(CONFIG_DEBUG_VERBOSE)
+  uint32 regval  = ssi_getreg(priv, LM3S_SSI_DR_OFFSET);
+  ssivdbg("RX: discard %04x\n", regval);
+#else
   (void)ssi_getreg(priv, LM3S_SSI_DR_OFFSET);
+#endif
 }
 
 static void ssi_rxuint16(struct lm32_ssidev_s *priv)
 {
   uint16 *ptr    = (uint16*)priv->rxbuffer;
-  *ptr++         = (uint16)ssi_getreg(priv, LM3S_SSI_DR_OFFSET);
-  priv->rxbuffer = (void*)ptr;
+  *ptr           = (uint16)ssi_getreg(priv, LM3S_SSI_DR_OFFSET);
+  ssivdbg("RX: %p<-%04x\n", ptr, *ptr);
+  priv->rxbuffer = (void*)(++ptr);
 }
 
 static void ssi_rxubyte(struct lm32_ssidev_s *priv)
 {
   ubyte *ptr     = (ubyte*)priv->rxbuffer;
-  *ptr++         = (ubyte)ssi_getreg(priv, LM3S_SSI_DR_OFFSET);
-  priv->rxbuffer = (void*)ptr;
+  *ptr           = (ubyte)ssi_getreg(priv, LM3S_SSI_DR_OFFSET);
+  ssivdbg("RX: %p<-%02x\n", ptr, *ptr);
+  priv->rxbuffer = (void*)(++ptr);
 }
 
 /****************************************************************************