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diff ds1307.c @ 3:15d89caaf516

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Add support for single UART devices, although untested apart from a compile. Doesn't break dual UART ones :) Also checks for PRR before setting it.
author darius@Inchoate
date Wed, 11 Mar 2009 17:28:39 +1030
parents 3879f487b661
children 3da232f97e81
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line diff
--- a/ds1307.c	Wed Mar 11 17:10:13 2009 +1030
+++ b/ds1307.c	Wed Mar 11 17:28:39 2009 +1030
@@ -46,9 +46,11 @@
  */
 int
 ds1307_init(void) {
+#ifdef PRR
     PRR &= _BV(PRTWI);		/* Power TWI on - note that the
 				 * datasheet says this is already 0 at
 				 * power on.. */
+#endif
     TWSR = 0; 			/* TWI Prescaler = 1 */
 #if F_CPU < 3600000UL
     TWBR = 10;			/* Smallest valid TWBR */