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/* Copyright 2020 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.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 "pimoroni_trackball.h"
#include "i2c_master.h"
static uint8_t scrolling = 0;
static int16_t x_offset = 0;
static int16_t y_offset = 0;
static int16_t h_offset = 0;
static int16_t v_offset = 0;
static float precisionSpeed = 1;
#ifndef I2C_TIMEOUT
# define I2C_TIMEOUT 100
#endif
#ifndef MOUSE_DEBOUNCE
# define MOUSE_DEBOUNCE 5
#endif
void trackball_set_rgbw(uint8_t red, uint8_t green, uint8_t blue, uint8_t white) {
uint8_t data[] = {0x00, red, green, blue, white};
i2c_transmit(TRACKBALL_ADDRESS << 1, data, sizeof(data), I2C_TIMEOUT);
}
int16_t mouse_offset(uint8_t positive, uint8_t negative, int16_t scale) {
int16_t offset = (int16_t)positive - (int16_t)negative;
int16_t magnitude = (int16_t)(scale * offset * offset * precisionSpeed);
return offset < 0 ? -magnitude : magnitude;
}
void update_member(int8_t* member, int16_t* offset) {
if (*offset > 127) {
*member = 127;
*offset -= 127;
} else if (*offset < -127) {
*member = -127;
*offset += 127;
} else {
*member = *offset;
*offset = 0;
}
}
__attribute__((weak)) void trackball_check_click(bool pressed, report_mouse_t* mouse) {
if (pressed) {
mouse->buttons |= MOUSE_BTN1;
} else {
mouse->buttons &= ~MOUSE_BTN1;
}
}
void trackball_register_button(bool pressed, enum mouse_buttons button) {
report_mouse_t currentReport = pointing_device_get_report();
if (pressed) {
currentReport.buttons |= button;
} else {
currentReport.buttons &= ~button;
}
pointing_device_set_report(currentReport);
}
float trackball_get_precision(void) { return precisionSpeed; }
void trackball_set_precision(float precision) { precisionSpeed = precision; }
bool trackball_is_scrolling(void) { return scrolling; }
void trackball_set_scrolling(bool scroll) { scrolling = scroll; }
bool has_report_changed (report_mouse_t first, report_mouse_t second) {
return !(
(!first.buttons && first.buttons == second.buttons) &&
(!first.x && first.x == second.x) &&
(!first.y && first.y == second.y) &&
(!first.h && first.h == second.h) &&
(!first.v && first.v == second.v) );
}
__attribute__((weak)) void pointing_device_init(void) { trackball_set_rgbw(0x00, 0x00, 0x00, 0x4F); }
void pointing_device_task(void) {
static bool debounce;
static uint16_t debounce_timer;
uint8_t state[5] = {};
if (i2c_readReg(TRACKBALL_ADDRESS << 1, 0x04, state, 5, I2C_TIMEOUT) == I2C_STATUS_SUCCESS) {
if (!state[4] && !debounce) {
if (scrolling) {
#ifdef PIMORONI_TRACKBALL_INVERT_X
h_offset += mouse_offset(state[2], state[3], 1);
#else
h_offset -= mouse_offset(state[2], state[3], 1);
#endif
#ifdef PIMORONI_TRACKBALL_INVERT_Y
v_offset += mouse_offset(state[1], state[0], 1);
#else
v_offset -= mouse_offset(state[1], state[0], 1);
#endif
} else {
#ifdef PIMORONI_TRACKBALL_INVERT_X
x_offset -= mouse_offset(state[2], state[3], 5);
#else
x_offset += mouse_offset(state[2], state[3], 5);
#endif
#ifdef PIMORONI_TRACKBALL_INVERT_Y
y_offset -= mouse_offset(state[1], state[0], 5);
#else
y_offset += mouse_offset(state[1], state[0], 5);
#endif
}
} else {
if (state[4]) {
debounce = true;
debounce_timer = timer_read();
}
}
}
if (timer_elapsed(debounce_timer) > MOUSE_DEBOUNCE) debounce = false;
report_mouse_t mouse = pointing_device_get_report();
trackball_check_click(state[4] & (1 << 7), &mouse);
#ifndef PIMORONI_TRACKBALL_ROTATE
update_member(&mouse.x, &x_offset);
update_member(&mouse.y, &y_offset);
update_member(&mouse.h, &h_offset);
update_member(&mouse.v, &v_offset);
#else
update_member(&mouse.x, &y_offset);
update_member(&mouse.y, &x_offset);
update_member(&mouse.h, &v_offset);
update_member(&mouse.v, &h_offset);
#endif
pointing_device_set_report(mouse);
if (has_report_changed(mouse, pointing_device_get_report())) {
pointing_device_send();
}
}
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