PB / RotaryEncoder

Rotary encoder handler.

RotaryEncoder.cpp@0:db7f371c8530, 2016-07-20 (annotated)

Committer:
Sateg
Date:
Wed Jul 20 00:30:23 2016 +0000
Revision:
0:db7f371c8530
Working, conservative rotary encoder handler.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Sateg 0:db7f371c8530 1 #include "RotaryEncoder.h"
Sateg 0:db7f371c8530 2
Sateg 0:db7f371c8530 3 RotaryEncoder::RotaryEncoder(void (*cb)(void), PinName channelA_, PinName channelB_, PinName pushPin_, float period)
Sateg 0:db7f371c8530 4 : channelA(channelA_), channelB(channelB_), pushPin(pushPin_)
Sateg 0:db7f371c8530 5 {
Sateg 0:db7f371c8530 6 direction = 0;
Sateg 0:db7f371c8530 7 counter = 0;
Sateg 0:db7f371c8530 8 lastDirection = 0;
Sateg 0:db7f371c8530 9
Sateg 0:db7f371c8530 10 encoderTicker.attach(this, &RotaryEncoder::pulse, period);
Sateg 0:db7f371c8530 11 pushPin.rise(cb);
Sateg 0:db7f371c8530 12 }
Sateg 0:db7f371c8530 13
Sateg 0:db7f371c8530 14 RotaryEncoder::~RotaryEncoder() {};
Sateg 0:db7f371c8530 15
Sateg 0:db7f371c8530 16 /** Public methods **/
Sateg 0:db7f371c8530 17
Sateg 0:db7f371c8530 18 int8_t RotaryEncoder::getDirection() const
Sateg 0:db7f371c8530 19 {
Sateg 0:db7f371c8530 20 return direction;
Sateg 0:db7f371c8530 21 }
Sateg 0:db7f371c8530 22
Sateg 0:db7f371c8530 23 int RotaryEncoder::getCounter() const
Sateg 0:db7f371c8530 24 {
Sateg 0:db7f371c8530 25 return counter;
Sateg 0:db7f371c8530 26 }
Sateg 0:db7f371c8530 27
Sateg 0:db7f371c8530 28 bool RotaryEncoder::getPushButton() const
Sateg 0:db7f371c8530 29 {
Sateg 0:db7f371c8530 30 return false;
Sateg 0:db7f371c8530 31 }
Sateg 0:db7f371c8530 32
Sateg 0:db7f371c8530 33 /** Private methods **/
Sateg 0:db7f371c8530 34
Sateg 0:db7f371c8530 35 void RotaryEncoder::pulse()
Sateg 0:db7f371c8530 36 {
Sateg 0:db7f371c8530 37 lastDirection <<= 2;
Sateg 0:db7f371c8530 38 if (channelB) lastDirection |= 1;
Sateg 0:db7f371c8530 39 if (channelA) lastDirection |= 2;
Sateg 0:db7f371c8530 40
Sateg 0:db7f371c8530 41 direction = encoderTable[lastDirection & 0x0F];
Sateg 0:db7f371c8530 42 counter += direction;
Sateg 0:db7f371c8530 43 }
Sateg 0:db7f371c8530 44
Sateg 0:db7f371c8530 45 const int8_t RotaryEncoder::encoderTable[] = {0, 0, 0, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 0, 0, 0};