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Diffstat (limited to 'drivers/sensors/pimoroni_trackball.c')
-rw-r--r--drivers/sensors/pimoroni_trackball.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/sensors/pimoroni_trackball.c b/drivers/sensors/pimoroni_trackball.c
new file mode 100644
index 000000000..c0ac644f7
--- /dev/null
+++ b/drivers/sensors/pimoroni_trackball.c
@@ -0,0 +1,140 @@
1/* Copyright 2020 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
2 *
3 * This program is free software: you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation, either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16
17#include "pimoroni_trackball.h"
18#include "i2c_master.h"
19
20static uint8_t scrolling = 0;
21static int16_t x_offset = 0;
22static int16_t y_offset = 0;
23static int16_t h_offset = 0;
24static int16_t v_offset = 0;
25static float precisionSpeed = 1;
26
27static uint16_t i2c_timeout_timer;
28
29#ifndef PIMORONI_I2C_TIMEOUT
30# define PIMORONI_I2C_TIMEOUT 100
31#endif
32#ifndef I2C_WAITCHECK
33# define I2C_WAITCHECK 1000
34#endif
35#ifndef MOUSE_DEBOUNCE
36# define MOUSE_DEBOUNCE 5
37#endif
38
39void trackball_set_rgbw(uint8_t red, uint8_t green, uint8_t blue, uint8_t white) {
40 uint8_t data[] = {0x00, red, green, blue, white};
41 i2c_transmit(TRACKBALL_WRITE, data, sizeof(data), PIMORONI_I2C_TIMEOUT);
42}
43
44int16_t mouse_offset(uint8_t positive, uint8_t negative, int16_t scale) {
45 int16_t offset = (int16_t)positive - (int16_t)negative;
46 int16_t magnitude = (int16_t)(scale * offset * offset * precisionSpeed);
47 return offset < 0 ? -magnitude : magnitude;
48}
49
50void update_member(int8_t* member, int16_t* offset) {
51 if (*offset > 127) {
52 *member = 127;
53 *offset -= 127;
54 } else if (*offset < -127) {
55 *member = -127;
56 *offset += 127;
57 } else {
58 *member = *offset;
59 *offset = 0;
60 }
61}
62
63__attribute__((weak)) void trackball_check_click(bool pressed, report_mouse_t* mouse) {
64 if (pressed) {
65 mouse->buttons |= MOUSE_BTN1;
66 } else {
67 mouse->buttons &= ~MOUSE_BTN1;
68 }
69}
70
71float trackball_get_precision(void) { return precisionSpeed; }
72void trackball_set_precision(float precision) { precisionSpeed = precision; }
73bool trackball_is_scrolling(void) { return scrolling; }
74void trackball_set_scrolling(bool scroll) { scrolling = scroll; }
75
76__attribute__((weak)) void pointing_device_init(void) { i2c_init(); trackball_set_rgbw(0x00, 0x00, 0x00, 0x00); }
77
78void pointing_device_task(void) {
79 static bool debounce;
80 static uint16_t debounce_timer;
81 uint8_t state[5] = {};
82 if (timer_elapsed(i2c_timeout_timer) > I2C_WAITCHECK) {
83 if (i2c_readReg(TRACKBALL_READ, 0x04, state, 5, PIMORONI_I2C_TIMEOUT) == I2C_STATUS_SUCCESS) {
84 if (!state[4] && !debounce) {
85 if (scrolling) {
86#ifdef PIMORONI_TRACKBALL_INVERT_X
87 h_offset += mouse_offset(state[2], state[3], 1);
88#else
89 h_offset -= mouse_offset(state[2], state[3], 1);
90#endif
91#ifdef PIMORONI_TRACKBALL_INVERT_Y
92 v_offset += mouse_offset(state[1], state[0], 1);
93#else
94 v_offset -= mouse_offset(state[1], state[0], 1);
95#endif
96 } else {
97#ifdef PIMORONI_TRACKBALL_INVERT_X
98 x_offset -= mouse_offset(state[2], state[3], 5);
99#else
100 x_offset += mouse_offset(state[2], state[3], 5);
101#endif
102#ifdef PIMORONI_TRACKBALL_INVERT_Y
103 y_offset -= mouse_offset(state[1], state[0], 5);
104#else
105 y_offset += mouse_offset(state[1], state[0], 5);
106#endif
107 }
108 } else {
109 if (state[4]) {
110 debounce = true;
111 debounce_timer = timer_read();
112 }
113 }
114 } else {
115 i2c_timeout_timer = timer_read();
116 }
117 }
118
119 if (timer_elapsed(debounce_timer) > MOUSE_DEBOUNCE) debounce = false;
120
121 report_mouse_t mouse = pointing_device_get_report();
122
123#ifdef PIMORONI_TRACKBALL_CLICK
124 trackball_check_click(state[4] & (1 << 7), &mouse);
125#endif
126
127#ifndef PIMORONI_TRACKBALL_ROTATE
128 update_member(&mouse.x, &x_offset);
129 update_member(&mouse.y, &y_offset);
130 update_member(&mouse.h, &h_offset);
131 update_member(&mouse.v, &v_offset);
132#else
133 update_member(&mouse.x, &y_offset);
134 update_member(&mouse.y, &x_offset);
135 update_member(&mouse.h, &v_offset);
136 update_member(&mouse.v, &h_offset);
137#endif
138 pointing_device_set_report(mouse);
139 pointing_device_send();
140}