Digistump Forums
The Digispark => Digispark Libraries => Topic started by: RC Navy on February 02, 2015, 01:30:44 pm
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Hi,
in complement of the interrupt-driven RC PPM frame generator for Digispark, Digispark pro and UNO described in this topic: http://digistump.com/board/index.php/topic,1682.msg7801/topicseen.html#msg7801 (http://digistump.com/board/index.php/topic,1682.msg7801/topicseen.html#msg7801), here is an interrupt-driven RC PPM frame reader for Digispark, Digispark pro and UNO.
Features:
- Based on TinyPinChange library: can use any pin supporting pin change interrupt
- Can read the pulse widths of up to 9 RC channels
- Can read Positive and Negative PPM modulation
- Detect automatically the number of RC channels transported in the PPM frame
- Synchro indicator provided (for synchronization purpose)
Use case examples:
- Standalone PPM reader!
- Channel substitution in an existing PPM frame (in conjunction with TinyPpmGen library)
- Digital data transmission over PPM (in conjunction with TinyPpmGen library)
- Channel permutation (in conjunction with TinyPpmGen library)
Blocking fonctions such as delay() can be used in the loop() since PPM reader and PPM generator libraries are interrupt driven.
Supported devices:
- ATtiny167 (Digispark pro: PPM output -> PA2 -> arduino pin#8)
- ATtiny85 (Digispark: PPM output -> PB0 -> arduino pin#0)
- ATmega328P (Arduino UNO: PPM output -> PD6 -> arduino pin#6)
Available in my Github repository:
https://github.com/RC-Navy/DigisparkArduinoIntegration/tree/master/libraries/DigisparkTinyPpmReader
RcPpmChSubst example demonstrates how to substitute a custom pulse width for a specific RC channel:
https://github.com/RC-Navy/DigisparkArduinoIntegration/blob/master/libraries/DigisparkTinyPpmReader/examples/RcPpmChSubst/RcPpmChSubst.ino (https://github.com/RC-Navy/DigisparkArduinoIntegration/blob/master/libraries/DigisparkTinyPpmReader/examples/RcPpmChSubst/RcPpmChSubst.ino)
Feel free to test/use it, feedback appreciated.