Diff: PololuLedStrip.cpp

Revision:

12:b6df8ac053c8

Parent:

10:f1bb84b97788

Child:

13:9c72841ec45e

diff -r e00ba70ac54c -r b6df8ac053c8 PololuLedStrip.cpp
--- a/PololuLedStrip.cpp	Fri Mar 01 04:16:44 2013 +0000
+++ b/PololuLedStrip.cpp	Fri Mar 01 04:34:54 2013 +0000
@@ -4,6 +4,8 @@
 
 uint8_t led_strip_write_delays[3];
 
+static const uint8_t delay_fudges[] = { 32, 0, 0 };
+
 void PololuLedStrip::calculateDelays()
 {
     // Get the clock frequency in MHz.
@@ -14,15 +16,24 @@
     
     // Arrange for a 600 nanosecond delay between the fall time for a 0 bit and the fall time for a 1 bit.
     // This means the pulses representing a 1 will be 700+600 = 1300 nanoseconds.
-    led_strip_write_delays[1] = 600*f_mhz/1000 - 19;
+    led_strip_write_delays[1] = 600*f_mhz/1000;
     
     // Arrange for a 1200 nanosecond delay between the fall time for a 1 bit and rise time of the next bit.
     // This means the period of the signal will be 2500 nanoseconds.
-    led_strip_write_delays[2] = 1200*f_mhz/1000 - 24;
+    led_strip_write_delays[2] = 1200*f_mhz/1000;
     
-    led_strip_write_delays[0] <<= 1;
-    led_strip_write_delays[1] <<= 1;
-    led_strip_write_delays[2] <<= 1;
+    for(int i = 0; i < 3; i++)
+    {
+        if (led_strip_write_delays[i] < delay_fudges[i])
+        {
+            led_strip_write_delays[i] = 0;
+        }
+        else
+        {
+            led_strip_write_delays[i] -= delay_fudges[i];
+            led_strip_write_delays[i] <<= 1;
+        }
+    }
 }
 
 PololuLedStrip::PololuLedStrip(PinName pinName)