Karl Zweimüller / mRotaryEncoder

Class mRotaryEncoder for mechanical incremental rotary encoders with pushbuttons. Use debouncing and callback-functions for rotation and pressing of button. This version is for old mbed. New version for mbed-os see https://os.mbed.com/users/charly/code/mRotaryEncoder-os/

Dependencies:   PinDetect

Dependents:   SimplePIDBot FinalProgram VS1053Player SPK-DVIMXR ... more

mRotaryEncoder.cpp@0:562943b05e99, 2010-11-29 (annotated)

Committer:
charly
Date:
Mon Nov 29 21:25:13 2010 +0000
Revision:
0:562943b05e99
Child:
2:f99ac9745a2c
Initial version based on CRotaryEncoder from Thomas Raab

Who changed what in which revision?

UserRevisionLine numberNew contents of line
charly 0:562943b05e99 1 #include "mbed.h"
charly 0:562943b05e99 2 #include "mRotaryEncoder.h"
charly 0:562943b05e99 3
charly 0:562943b05e99 4
charly 0:562943b05e99 5 mRotaryEncoder::mRotaryEncoder(PinName pinA, PinName pinB, PinName pinSW, PinMode pullMode, int debounceTime_us) {
charly 0:562943b05e99 6 m_pinA = new InterruptIn(pinA); // interrrupts on pinA
charly 0:562943b05e99 7 m_pinB = new DigitalIn(pinB); // only digitalIn for pinB
charly 0:562943b05e99 8
charly 0:562943b05e99 9 //set pins with internal PullUP-default
charly 0:562943b05e99 10 m_pinA->mode(pullMode);
charly 0:562943b05e99 11 m_pinB->mode(pullMode);
charly 0:562943b05e99 12
charly 0:562943b05e99 13 // attach interrrupts on pinA
charly 0:562943b05e99 14 m_pinA->rise(this, &mRotaryEncoder::rise);
charly 0:562943b05e99 15 m_pinA->fall(this, &mRotaryEncoder::fall);
charly 0:562943b05e99 16
charly 0:562943b05e99 17 // Switch on pinSW
charly 0:562943b05e99 18 m_pinSW = new InterruptIn(pinSW); // interrupt on press switch
charly 0:562943b05e99 19 m_pinSW->mode(pullMode);
charly 0:562943b05e99 20
charly 0:562943b05e99 21 m_position = 0;
charly 0:562943b05e99 22
charly 0:562943b05e99 23 m_debounceTime_us = debounceTime_us;
charly 0:562943b05e99 24 }
charly 0:562943b05e99 25
charly 0:562943b05e99 26 mRotaryEncoder::~mRotaryEncoder() {
charly 0:562943b05e99 27 delete m_pinA;
charly 0:562943b05e99 28 delete m_pinB;
charly 0:562943b05e99 29 delete m_pinSW;
charly 0:562943b05e99 30 }
charly 0:562943b05e99 31
charly 0:562943b05e99 32 int mRotaryEncoder::Get(void) {
charly 0:562943b05e99 33 return m_position;
charly 0:562943b05e99 34 }
charly 0:562943b05e99 35
charly 0:562943b05e99 36
charly 0:562943b05e99 37
charly 0:562943b05e99 38 void mRotaryEncoder::Set(int value) {
charly 0:562943b05e99 39 m_position = value;
charly 0:562943b05e99 40 }
charly 0:562943b05e99 41
charly 0:562943b05e99 42
charly 0:562943b05e99 43 void mRotaryEncoder::fall(void) {
charly 0:562943b05e99 44 //no interrupts
charly 0:562943b05e99 45 m_pinA->rise(NULL);
charly 0:562943b05e99 46 m_pinA->fall(NULL);
charly 0:562943b05e99 47 wait_us(m_debounceTime_us); // wait while switch is bouncing
charly 0:562943b05e99 48 //pinA still low?
charly 0:562943b05e99 49 if (*m_pinA == 0) {
charly 0:562943b05e99 50 if (*m_pinB == 1) {
charly 0:562943b05e99 51 m_position++;
charly 0:562943b05e99 52 } else {
charly 0:562943b05e99 53 m_position--;
charly 0:562943b05e99 54 }
charly 0:562943b05e99 55 }
charly 0:562943b05e99 56 //reenable interrupts
charly 0:562943b05e99 57 m_pinA->rise(this, &mRotaryEncoder::rise);
charly 0:562943b05e99 58 m_pinA->fall(this, &mRotaryEncoder::fall);
charly 0:562943b05e99 59 rotIsr.call(); // call the isr for rotation
charly 0:562943b05e99 60 }
charly 0:562943b05e99 61
charly 0:562943b05e99 62 void mRotaryEncoder::rise(void) {
charly 0:562943b05e99 63 //no interrupts
charly 0:562943b05e99 64 m_pinA->rise(NULL);
charly 0:562943b05e99 65 m_pinA->fall(NULL);
charly 0:562943b05e99 66 wait_us(m_debounceTime_us); // wait while switch is bouncing
charly 0:562943b05e99 67 //pinA still high?
charly 0:562943b05e99 68 if (*m_pinA == 1) {
charly 0:562943b05e99 69 if (*m_pinB == 1) {
charly 0:562943b05e99 70 m_position--;
charly 0:562943b05e99 71 } else {
charly 0:562943b05e99 72 m_position++;
charly 0:562943b05e99 73 }
charly 0:562943b05e99 74 }
charly 0:562943b05e99 75 //reenable interrupts
charly 0:562943b05e99 76 m_pinA->rise(this, &mRotaryEncoder::rise);
charly 0:562943b05e99 77 m_pinA->fall(this, &mRotaryEncoder::fall);
charly 0:562943b05e99 78 rotIsr.call(); // call the isr for rotation
charly 0:562943b05e99 79 }
charly 0:562943b05e99 80