[src/trunk]: src/sys/dev Revert back to a 16 bit phase counter - stops overfl...

[nat <nat%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/52d18286bda5
branches:  trunk
changeset: 354313:52d18286bda5
user:      nat <nat%NetBSD.org@localhost>
date:      Sun Jun 11 13:05:43 2017 +0000

description:
Revert back to a 16 bit phase counter - stops overflow when performing
calculations on pitch and phase.

diffstat:

 sys/dev/audiobell.c |  10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diffs (45 lines):

diff -r 6d474eb0fa09 -r 52d18286bda5 sys/dev/audiobell.c
--- a/sys/dev/audiobell.c       Sun Jun 11 13:02:44 2017 +0000
+++ b/sys/dev/audiobell.c       Sun Jun 11 13:05:43 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: audiobell.c,v 1.21 2017/06/11 13:02:44 nat Exp $       */
+/*     $NetBSD: audiobell.c,v 1.22 2017/06/11 13:05:43 nat Exp $       */
 
 
 /*
@@ -32,7 +32,7 @@
  */
 
 #include <sys/types.h>
-__KERNEL_RCSID(0, "$NetBSD: audiobell.c,v 1.21 2017/06/11 13:02:44 nat Exp $");
+__KERNEL_RCSID(0, "$NetBSD: audiobell.c,v 1.22 2017/06/11 13:05:43 nat Exp $");
 
 #include <sys/audioio.h>
 #include <sys/conf.h>
@@ -54,7 +54,7 @@
 
 /* 44.1 kHz should reduce hum at higher pitches. */
 #define BELL_SAMPLE_RATE       44100
-#define BELL_SHIFT             19
+#define BELL_SHIFT             3
 
 static inline void
 audiobell_expandwave(int16_t *buf)
@@ -75,7 +75,7 @@
  */
 static inline int
 audiobell_synthesize(int16_t *buf, u_int pitch, u_int period, u_int volume,
-    uint32_t *phase)
+    uint16_t *phase)
 {
        int16_t *wave;
 
@@ -99,7 +99,7 @@
 audiobell(void *v, u_int pitch, u_int period, u_int volume, int poll)
 {
        int16_t *buf;
-       uint32_t phase;
+       uint16_t phase;
        struct audio_info ai;
        struct uio auio;
        struct iovec aiov;