Need to clear interrupt

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1819 42af7a65-404d-4744-a932-0658087f49c3

arch/arm/src/lm3s/lm3s_ssi.c

@@ -760,10 +760,16 @@ static inline struct lm32_ssidev_s *ssi_mapirq(int irq)
 static int ssi_interrupt(int irq, void *context)
 {
   struct lm32_ssidev_s *priv = ssi_mapirq(irq);
+  uint32 regval;
   int ntxd;
 
   DEBUGASSERT(priv != NULL);
 
+  /* Clear pending interrupts */
+
+  regval = ssi_getreg(priv, LM3S_SSI_RIS_OFFSET);
+  ssi_putreg(priv, LM3S_SSI_ICR_OFFSET, regval);
+
   /* Handle outgoing Tx FIFO transfers */
 
   ntxd = ssi_performtx(priv);