From 7ba2d9ed36a1ae2f196930042be30bf7c5d3fab0 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Sun, 20 Jul 2014 13:04:30 -0600
Subject: [PATCH] SAMA5D4-EK: PIO Schmitt trigger logic backward

---
 arch/arm/src/sama5/sam_pio.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/arm/src/sama5/sam_pio.c b/arch/arm/src/sama5/sam_pio.c
index 9c40b507403..eb280cc2e8f 100644
--- a/arch/arm/src/sama5/sam_pio.c
+++ b/arch/arm/src/sama5/sam_pio.c
@@ -337,16 +337,18 @@ static inline int sam_configinput(uintptr_t base, uint32_t pin,
     }
 
 #ifdef PIO_HAVE_SCHMITT
-  /* Enable/disable the Schmitt trigger */
+  /* Enable/disable the Schmitt trigger:  Zero enables.  Schmitt triggered
+   * inputs are enabled by default.
+   */
 
   regval = getreg32(base + SAM_PIO_SCHMITT_OFFSET);
   if ((cfgset & PIO_CFG_SCHMITT) != 0)
     {
-      regval |= pin;
+      regval &= ~pin;
     }
   else
     {
-      regval &= ~pin;
+      regval |= pin;
     }
 
   putreg32(regval, base + SAM_PIO_SCHMITT_OFFSET);