From: Ben Harris <bjh21@bjh21.me.uk>
Date: Sun, 11 Nov 2018 01:49:04 +0000 (+0000)
Subject: Comment on pulse width and adjust advance rate.
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~bjharris/git?a=commitdiff_plain;h=fe0af9da5855925deae802ac02a9adc593759119;p=clunk.git

Comment on pulse width and adjust advance rate.

Both based on the spec for Post Office clock 26 mark 6.  This
specifies the pulse width (200-500 ms) and the advance rate (one pulse
per second).
---

diff --git a/clunk.c b/clunk.c
index f358249..0b2fdc9 100644
--- a/clunk.c
+++ b/clunk.c
@@ -4,6 +4,9 @@
 #include <time.h>
 #include <unistd.h>
 
+/*
+ * Post Office specification 479B requires a pulse length of 200-500 ms.
+ */
 static long const pulsewidth = 250000000; /* nanoseconds */
 
 /*
@@ -120,7 +123,7 @@ run()
 		tick = 30;
 		switch (need_adjust(&tm)) {
 		case ADVANCE:
-			tick = 2;
+			tick = 1;
 			/* FALLTHROUGH */
 		case TICK:
 			pulse();