Eduard Medla / PPM

Read modify and generate PPM

Dependents:   pwm-output

Fork of PPM by good god

PPMOut.h@1:3649456c67ef, 2017-06-09 (annotated)

Committer:
edy05
Date:
Fri Jun 09 08:34:42 2017 +0000
Revision:
1:3649456c67ef
Parent:
0:ab42e541f04d 
PPM read class

Who changed what in which revision?

UserRevisionLine numberNew contents of line
goodgod 0:ab42e541f04d 1 #ifndef CH_PPM_OUT
goodgod 0:ab42e541f04d 2 #define CH_PPM_OUT
goodgod 0:ab42e541f04d 3
goodgod 0:ab42e541f04d 4 class PpmOut{
goodgod 0:ab42e541f04d 5 public:
goodgod 0:ab42e541f04d 6 static const uint8_t MAX_CHANNELS = 8;
goodgod 0:ab42e541f04d 7 static const uint16_t CHANNEL_SYNC = 300; // us
goodgod 0:ab42e541f04d 8 static const uint16_t CHANNEL_PAD_SYNC = 1000 - CHANNEL_SYNC; // us
goodgod 0:ab42e541f04d 9 static const uint16_t FRAME_SYNC = 5000; // us
edy05 1:3649456c67ef 10 static const uint16_t FRAME_LEN = 20000; // us
edy05 1:3649456c67ef 11 static const uint16_t MAX_CHANNEL_VALUE = 1980; // us
edy05 1:3649456c67ef 12 static const uint16_t MIN_CHANNEL_VALUE = 1020;
goodgod 0:ab42e541f04d 13 static const uint16_t DOTS = MAX_CHANNELS*2+2; // two dots per channel + FRAME_SYNC
goodgod 0:ab42e541f04d 14
goodgod 0:ab42e541f04d 15 /* Will start the PPM output */
goodgod 0:ab42e541f04d 16 PpmOut(PinName pin, uint8_t channel_number);
goodgod 0:ab42e541f04d 17 /* Values go from MIN_CHANNEL_VALUE to MAX_CHANNEL_VALUE */
goodgod 0:ab42e541f04d 18 void setChannel(int channel_no, uint16_t value);
goodgod 0:ab42e541f04d 19
goodgod 0:ab42e541f04d 20 private:
goodgod 0:ab42e541f04d 21 /* These are the time dots where the signal changes the value
goodgod 0:ab42e541f04d 22 from 0 to 1 and in reverse */
goodgod 0:ab42e541f04d 23 uint16_t dots[DOTS];
goodgod 0:ab42e541f04d 24 Timeout timeout;
goodgod 0:ab42e541f04d 25 DigitalOut ppm;
goodgod 0:ab42e541f04d 26 uint8_t current_dot;
goodgod 0:ab42e541f04d 27 uint8_t channel_number;
goodgod 0:ab42e541f04d 28 uint16_t frame_length;
goodgod 0:ab42e541f04d 29 uint16_t pulse_out;
goodgod 0:ab42e541f04d 30
goodgod 0:ab42e541f04d 31 void attimeout();
goodgod 0:ab42e541f04d 32 inline void resetChannels();
goodgod 0:ab42e541f04d 33 inline void setFrameSync();
goodgod 0:ab42e541f04d 34 };
goodgod 0:ab42e541f04d 35
goodgod 0:ab42e541f04d 36 #endif // CH_PPM_OUT