Tetsuya Hoshino / RotaryEncoder

ロータリーエンコーダー (機械接点式インクリメンタル型) の信号をデコードするクラスです。 Rotary Encoder (incremental, mechanical switch type) signal decoder class.

RotaryEncoder.cpp@0:fcf360069f17, 2014-09-07 (annotated)

Committer:
tetsuya256
Date:
Sun Sep 07 23:31:47 2014 +0000
Revision:
0:fcf360069f17
First commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
tetsuya256 0:fcf360069f17 1 #include <RotaryEncoder.h>
tetsuya256 0:fcf360069f17 2
tetsuya256 0:fcf360069f17 3 RotaryEncoder::RotaryEncoder(PinName A, PinName B)
tetsuya256 0:fcf360069f17 4 : terminalA(A, PullUp), terminalB(B, PullUp)
tetsuya256 0:fcf360069f17 5 {
tetsuya256 0:fcf360069f17 6 }
tetsuya256 0:fcf360069f17 7
tetsuya256 0:fcf360069f17 8 void RotaryEncoder::attach(void (*callback)(int)) {
tetsuya256 0:fcf360069f17 9 callbackFunc = callback;
tetsuya256 0:fcf360069f17 10 tick.attach_us(this, &RotaryEncoder::smpling, RotaryEncoder_SamplingInterval);
tetsuya256 0:fcf360069f17 11 }
tetsuya256 0:fcf360069f17 12
tetsuya256 0:fcf360069f17 13 void RotaryEncoder::detach() {
tetsuya256 0:fcf360069f17 14 tick.detach();
tetsuya256 0:fcf360069f17 15 }
tetsuya256 0:fcf360069f17 16
tetsuya256 0:fcf360069f17 17 void RotaryEncoder::smpling() {
tetsuya256 0:fcf360069f17 18 static uint8_t val = 0xFF;
tetsuya256 0:fcf360069f17 19 uint8_t now = (terminalA.read() << 1) | (terminalB.read());
tetsuya256 0:fcf360069f17 20 if (now == (val & 0x03)) return;
tetsuya256 0:fcf360069f17 21 val = (val << 2) | now;
tetsuya256 0:fcf360069f17 22 switch (val) {
tetsuya256 0:fcf360069f17 23 case 0x4B: (*callbackFunc)(1); break; // cw : 0b01001011 = 0x4B
tetsuya256 0:fcf360069f17 24 case 0x87: (*callbackFunc)(0); break; // ccw : 0b10000111 = 0x87
tetsuya256 0:fcf360069f17 25 }
tetsuya256 0:fcf360069f17 26 }