From: simimeie <simimeie>
Date: Sat, 10 Jul 2010 07:36:28 +0000 (+0000)
Subject: - change bit definitions to avoid problems for users of broken avr-libc
X-Git-Url: http://git.rrze.uni-erlangen.de/gitweb/?a=commitdiff_plain;h=c7c49995443544bf5eaf10ec2890923bad939a6f;p=moodlight.git

- change bit definitions to avoid problems for users of broken avr-libc
  versions: just _BV(n) instead of _BV(PXn).
- link to nice NEC protocol description webpage.
---

diff --git a/ircontrol.c b/ircontrol.c
index 4a8e46f..16ff7b0 100644
--- a/ircontrol.c
+++ b/ircontrol.c
@@ -1,4 +1,4 @@
-/* $Id: ircontrol.c,v 1.5 2010/06/30 19:38:28 simimeie Exp $
+/* $Id: ircontrol.c,v 1.6 2010/07/10 07:36:28 simimeie Exp $
  * Functions for the infrared receiver
  *
  * The infrared receiver is connected to PB0 / PCINT0.
@@ -22,7 +22,9 @@
  * that equals around 7100 cpu cycles at 8 MHz. */
 #define RC5HALFLENINCYCLES ((CPUFREQ * 889UL) / 1000000UL)
 
-/* For NEC, we start with a 9000 us pulse, then 4500 us silence.
+/* Source for most of this was the following nice page with illustrations
+ * and all that: http://www.sbprojects.com/knowledge/ir/nec.htm
+ * For NEC, we start with a 9000 us pulse, then 4500 us silence.
  * Then the bits follow:
  * a 1 is a 560 us pulse followed by 1690 us of silence (=2250 us total).
  * a 0 is a 560 us pulse followed by  560 us of silence (=1120 us total).
@@ -69,7 +71,7 @@ ISR(PCINT0_vect) {
   uint32_t ts1diff; /* distance from last 1 */
   uint32_t ts0diff; /* distance from last 0 */
   
-  v = PINB & _BV(PB0);
+  v = PINB & _BV(0);
   if (v == lastpin) {  /* No change visible - spurious interrupt */
     return;
   }
@@ -184,7 +186,7 @@ ISR(PCINT0_vect) {
 void ircontrol_init(void)
 {
   /* Activate pullup */
-  PORTB |= _BV(PB0);
+  PORTB |= _BV(0);
   /* enable PCINT0 */
   PCICR |= _BV(PCIE0);
   /* Enable pin change interrupt 0 (=PB0) in pcint0 */