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Fork of PololuLedStrip by
Diff: PololuLedStrip.cpp
- Revision:
- 12:b6df8ac053c8
- Parent:
- 10:f1bb84b97788
- Child:
- 13:9c72841ec45e
--- 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)