sht11.c.patch

diff --git a/dev/sht11/sht11.c b/dev/sht11/sht11.c
index f6780d0..5b81099 100644
--- a/dev/sht11/sht11.c
+++ b/dev/sht11/sht11.c
@@ -65,6 +65,7 @@
 /* This can probably be reduced to 250ns according to data sheet. */
 #ifndef delay_400ns
 #define delay_400ns() _NOP()
+//#define delay_400ns() __delay_cycles(4); // 500 ns @ 8MHz
 #endif
 /*---------------------------------------------------------------------------*/
 static void
@@ -106,9 +107,9 @@ sreset(void)
 static int
 swrite(unsigned _c)
 {
-  unsigned char c = _c;
+  volatile unsigned char c = _c;
   int i;
-  int ret;
+  volatile int ret;
 
   for(i = 0; i < 8; i++, c <<= 1) {
     if(c & 0x80) {
@@ -136,7 +137,7 @@ static unsigned
 sread(int send_ack)
 {
   int i;
-  unsigned char c = 0x00;
+  volatile unsigned char c = 0x00;
 
   SDA_1();
   for(i = 0; i < 8; i++) {
@@ -262,9 +263,10 @@ scmd(unsigned cmd)
     goto fail;
   }
 
-  for(n = 0; n < 20000; n++) {
+  watchdog_stop();
+  for(n = 0; n < 1000; n++) {
     if(!SDA_IS_1) {
-      unsigned t0, t1, rcrc;
+      volatile unsigned t0, t1, rcrc;
       t0 = sread(1);
       t1 = sread(1);
       rcrc = sread(0);
@@ -282,12 +284,15 @@ scmd(unsigned cmd)
 	}
       }
 #endif
+      watchdog_start();
       return (t0 << 8) | t1;
     }
     /* short wait before next loop */
     clock_wait(1);
+    //__delay_cycles(8000); // 1 ms
   }
  fail:
+  watchdog_start();
   sreset();
   return -1;
 }