summaryrefslogtreecommitdiff
path: root/protocol/ps2_mouse.c
blob: ea629655f723b62ec78a10ac6c72d7caf78b5d10 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
/*
Copyright 2011,2013 Jun Wako <wakojun@gmail.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdbool.h>
#include<avr/io.h>
#include<util/delay.h>
#include "ps2.h"
#include "ps2_mouse.h"
#include "report.h"
#include "host.h"
#include "timer.h"
#include "print.h"
#include "debug.h"


static report_mouse_t mouse_report = {};


static void print_usb_data(void);


/* supports only 3 button mouse at this time */
uint8_t ps2_mouse_init(void) {
    uint8_t rcv;

    ps2_host_init();

    _delay_ms(1000);    // wait for powering up

    // send Reset
    rcv = ps2_host_send(0xFF);
    print("ps2_mouse_init: send Reset: ");
    phex(rcv); phex(ps2_error); print("\n");

    // read completion code of BAT
    rcv = ps2_host_recv();
    print("ps2_mouse_init: read BAT: ");
    phex(rcv); phex(ps2_error); print("\n");

    // read Device ID
    rcv = ps2_host_recv();
    print("ps2_mouse_init: read DevID: ");
    phex(rcv); phex(ps2_error); print("\n");

    // send Enable Data Reporting
    rcv = ps2_host_send(0xF4);
    print("ps2_mouse_init: send 0xF4: ");
    phex(rcv); phex(ps2_error); print("\n");

    // send Set Remote mode
    rcv = ps2_host_send(0xF0);
    print("ps2_mouse_init: send 0xF0: ");
    phex(rcv); phex(ps2_error); print("\n");

    return 0;
}

#define X_IS_NEG  (mouse_report.buttons & (1<<PS2_MOUSE_X_SIGN))
#define Y_IS_NEG  (mouse_report.buttons & (1<<PS2_MOUSE_Y_SIGN))
#define X_IS_OVF  (mouse_report.buttons & (1<<PS2_MOUSE_X_OVFLW))
#define Y_IS_OVF  (mouse_report.buttons & (1<<PS2_MOUSE_Y_OVFLW))
void ps2_mouse_task(void)
{
    enum { SCROLL_NONE, SCROLL_BTN, SCROLL_SENT };
    static uint8_t scroll_state = SCROLL_NONE;
    static uint8_t buttons_prev = 0;

    /* receives packet from mouse */
    uint8_t rcv;
    rcv = ps2_host_send(PS2_MOUSE_READ_DATA);
    if (rcv == PS2_ACK) {
        mouse_report.buttons = ps2_host_recv_response();
        mouse_report.x = ps2_host_recv_response();
        mouse_report.y = ps2_host_recv_response();
    } else {
        if (!debug_mouse) print("ps2_mouse: fail to get mouse packet\n");
        return;
    }

    /* if mouse moves or buttons state changes */
    if (mouse_report.x || mouse_report.y ||
            ((mouse_report.buttons ^ buttons_prev) & PS2_MOUSE_BTN_MASK)) {

#ifdef PS2_MOUSE_DEBUG
        print("ps2_mouse raw: [");
        phex(mouse_report.buttons); print("|");
        print_hex8((uint8_t)mouse_report.x); print(" ");
        print_hex8((uint8_t)mouse_report.y); print("]\n");
#endif

        buttons_prev = mouse_report.buttons;

        // PS/2 mouse data is '9-bit integer'(-256 to 255) which is comprised of sign-bit and 8-bit value.
        // bit: 8    7 ... 0
        //      sign \8-bit/
        //
        // Meanwhile USB HID mouse indicates 8bit data(-127 to 127), note that -128 is not used.
        //
        // This converts PS/2 data into HID value. Use only -127-127 out of PS/2 9-bit.
        mouse_report.x = X_IS_NEG ?
                          ((!X_IS_OVF && -127 <= mouse_report.x && mouse_report.x <= -1) ?  mouse_report.x : -127) :
                          ((!X_IS_OVF && 0 <= mouse_report.x && mouse_report.x <= 127) ? mouse_report.x : 127);
        mouse_report.y = Y_IS_NEG ?
                          ((!Y_IS_OVF && -127 <= mouse_report.y && mouse_report.y <= -1) ?  mouse_report.y : -127) :
                          ((!Y_IS_OVF && 0 <= mouse_report.y && mouse_report.y <= 127) ? mouse_report.y : 127);

        // remove sign and overflow flags
        mouse_report.buttons &= PS2_MOUSE_BTN_MASK;

        // invert coordinate of y to conform to USB HID mouse
        mouse_report.y = -mouse_report.y;


#if PS2_MOUSE_SCROLL_BTN_MASK
        static uint16_t scroll_button_time = 0;
        if ((mouse_report.buttons & (PS2_MOUSE_SCROLL_BTN_MASK)) == (PS2_MOUSE_SCROLL_BTN_MASK)) {
            if (scroll_state == SCROLL_NONE) {
                scroll_button_time = timer_read();
                scroll_state = SCROLL_BTN;
            }

            // doesn't send Scroll Button
            //mouse_report.buttons &= ~(PS2_MOUSE_SCROLL_BTN_MASK);

            if (mouse_report.x || mouse_report.y) {
                scroll_state = SCROLL_SENT;

                mouse_report.v = -mouse_report.y/(PS2_MOUSE_SCROLL_DIVISOR_V);
                mouse_report.h =  mouse_report.x/(PS2_MOUSE_SCROLL_DIVISOR_H);
                mouse_report.x = 0;
                mouse_report.y = 0;
                //host_mouse_send(&mouse_report);
            }
        }
        else if ((mouse_report.buttons & (PS2_MOUSE_SCROLL_BTN_MASK)) == 0) {
#if PS2_MOUSE_SCROLL_BTN_SEND
            if (scroll_state == SCROLL_BTN &&
                    TIMER_DIFF_16(timer_read(), scroll_button_time) < PS2_MOUSE_SCROLL_BTN_SEND) {
                // send Scroll Button(down and up at once) when not scrolled
                mouse_report.buttons |= (PS2_MOUSE_SCROLL_BTN_MASK);
                host_mouse_send(&mouse_report);
                _delay_ms(100);
                mouse_report.buttons &= ~(PS2_MOUSE_SCROLL_BTN_MASK);
            }
#endif
            scroll_state = SCROLL_NONE;
        }
        // doesn't send Scroll Button
        mouse_report.buttons &= ~(PS2_MOUSE_SCROLL_BTN_MASK);
#endif


        host_mouse_send(&mouse_report);
        print_usb_data();
    }
    // clear report
    mouse_report.x = 0;
    mouse_report.y = 0;
    mouse_report.v = 0;
    mouse_report.h = 0;
    mouse_report.buttons = 0;
}

static void print_usb_data(void)
{
    if (!debug_mouse) return;
    print("ps2_mouse usb: [");
    phex(mouse_report.buttons); print("|");
    print_hex8((uint8_t)mouse_report.x); print(" ");
    print_hex8((uint8_t)mouse_report.y); print(" ");
    print_hex8((uint8_t)mouse_report.v); print(" ");
    print_hex8((uint8_t)mouse_report.h); print("]\n");
}


/* PS/2 Mouse Synopsis
 * http://www.computer-engineering.org/ps2mouse/
 *
 * Command:
 * 0xFF: Reset
 * 0xF6: Set Defaults Sampling; rate=100, resolution=4cnt/mm, scaling=1:1, reporting=disabled
 * 0xF5: Disable Data Reporting
 * 0xF4: Enable Data Reporting
 * 0xF3: Set Sample Rate
 * 0xF2: Get Device ID
 * 0xF0: Set Remote Mode
 * 0xEB: Read Data
 * 0xEA: Set Stream Mode
 * 0xE9: Status Request
 * 0xE8: Set Resolution
 * 0xE7: Set Scaling 2:1
 * 0xE6: Set Scaling 1:1
 *
 * Mode:
 * Stream Mode: devices sends the data when it changs its state
 * Remote Mode: host polls the data periodically
 *
 * This code uses Remote Mode and polls the data with Read Data(0xEB).
 *
 * Data format:
 * byte|7       6       5       4       3       2       1       0
 * ----+--------------------------------------------------------------
 *    0|Yovflw  Xovflw  Ysign   Xsign   1       Middle  Right   Left
 *    1|                    X movement
 *    2|                    Y movement
 */