From d3f1f82e5f65e83198b3ef0f013ed7c77dbc120d Mon Sep 17 00:00:00 2001
From: Brian Boucheron <brian@boucheron.org>
Date: Sun, 17 Jul 2011 13:35:44 -0400
Subject: [PATCH] added error message for step pulses < 3 microseconds

---
 settings.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/settings.c b/settings.c
index a99fe25..82544d3 100644
--- a/settings.c
+++ b/settings.c
@@ -145,7 +145,12 @@ void settings_store_setting(int parameter, double value) {
       return;
     }
     settings.steps_per_mm[parameter] = value; break;
-    case 3: settings.pulse_microseconds = round(value); break;
+    case 3: 
+    if (value < 3) {
+      printPgmString(PSTR("Step pulse must be >= 3 microseconds\r\n"));
+      return;
+    }
+    settings.pulse_microseconds = round(value); break;
     case 4: settings.default_feed_rate = value; break;
     case 5: settings.default_seek_rate = value; break;
     case 6: settings.mm_per_arc_segment = value; break;