Alexander Hentschel / PS2

Fork of PS/2 Keyboard lib.

Dependents:   C64Synth

Fork of PS2 by Pallavi Prasad

PS2Mouse.cpp@0:62b62530a82f, 2012-10-11 (annotated)

Committer:
pprasad7
Date:
Thu Oct 11 20:15:09 2012 +0000
Revision:
0:62b62530a82f
PS/2 Input;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
pprasad7 0:62b62530a82f 1 /**
pprasad7 0:62b62530a82f 2 * PS/2 mouse interface control class (Version 0.0.1)
pprasad7 0:62b62530a82f 3 *
pprasad7 0:62b62530a82f 4 * Copyright (C) 2010 Shinichiro Nakamura (CuBeatSystems)
pprasad7 0:62b62530a82f 5 * http://shinta.main.jp/
pprasad7 0:62b62530a82f 6 */
pprasad7 0:62b62530a82f 7 #include "PS2Mouse.h"
pprasad7 0:62b62530a82f 8
pprasad7 0:62b62530a82f 9 PS2Mouse::PS2Mouse(PinName clk_pin, PinName dat_pin)
pprasad7 0:62b62530a82f 10 : ps2ms_init(clk_pin, dat_pin), ps2ms(clk_pin, dat_pin) {
pprasad7 0:62b62530a82f 11 cnt = 0;
pprasad7 0:62b62530a82f 12 }
pprasad7 0:62b62530a82f 13
pprasad7 0:62b62530a82f 14 PS2Mouse::~PS2Mouse() {
pprasad7 0:62b62530a82f 15 }
pprasad7 0:62b62530a82f 16
pprasad7 0:62b62530a82f 17 bool PS2Mouse::processing(mouse_event_t *p) {
pprasad7 0:62b62530a82f 18 bool emit = false;
pprasad7 0:62b62530a82f 19 for (int i = 0; i < 4; i++) {
pprasad7 0:62b62530a82f 20 const int c = ps2ms.getc();
pprasad7 0:62b62530a82f 21 if (0 <= c) {
pprasad7 0:62b62530a82f 22 switch (cnt % 4) {
pprasad7 0:62b62530a82f 23 case 0:
pprasad7 0:62b62530a82f 24 mi.byte1.byte = c;
pprasad7 0:62b62530a82f 25 /*
pprasad7 0:62b62530a82f 26 * Check and reset a buffer if state is wrong.
pprasad7 0:62b62530a82f 27 */
pprasad7 0:62b62530a82f 28 if (mi.byte1.bit.always1 == 0) {
pprasad7 0:62b62530a82f 29 cnt = 0;
pprasad7 0:62b62530a82f 30 while (0 <= ps2ms.getc()) {
pprasad7 0:62b62530a82f 31 }
pprasad7 0:62b62530a82f 32 }
pprasad7 0:62b62530a82f 33 break;
pprasad7 0:62b62530a82f 34 case 1:
pprasad7 0:62b62530a82f 35 mi.byte2.byte = c;
pprasad7 0:62b62530a82f 36 break;
pprasad7 0:62b62530a82f 37 case 2:
pprasad7 0:62b62530a82f 38 mi.byte3.byte = c;
pprasad7 0:62b62530a82f 39 break;
pprasad7 0:62b62530a82f 40 case 3:
pprasad7 0:62b62530a82f 41 mi.byte4.byte = c;
pprasad7 0:62b62530a82f 42 /*
pprasad7 0:62b62530a82f 43 * Store a event data.
pprasad7 0:62b62530a82f 44 */
pprasad7 0:62b62530a82f 45 p->left = mi.byte1.bit.btnLeft ? true : false;
pprasad7 0:62b62530a82f 46 p->center = mi.byte1.bit.btnCenter ? true : false;
pprasad7 0:62b62530a82f 47 p->right = mi.byte1.bit.btnRight ? true : false;
pprasad7 0:62b62530a82f 48 p->x = mi.byte1.bit.signX ? (-256 + mi.byte2.byte) : mi.byte2.byte;
pprasad7 0:62b62530a82f 49 p->y = mi.byte1.bit.signY ? (-256 + mi.byte3.byte) : mi.byte3.byte;
pprasad7 0:62b62530a82f 50 p->z = mi.byte4.bit.signZ ? (-128 + mi.byte4.bit.value) : mi.byte4.bit.value;
pprasad7 0:62b62530a82f 51 emit = true;
pprasad7 0:62b62530a82f 52 break;
pprasad7 0:62b62530a82f 53 }
pprasad7 0:62b62530a82f 54 cnt++;
pprasad7 0:62b62530a82f 55 }
pprasad7 0:62b62530a82f 56 }
pprasad7 0:62b62530a82f 57 return emit;
pprasad7 0:62b62530a82f 58 }