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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;
-
- static uint16_t i2c_timeout_timer;
-
- #ifndef PIMORONI_I2C_TIMEOUT
- # define PIMORONI_I2C_TIMEOUT 100
- #endif
- #ifndef I2C_WAITCHECK
- # define I2C_WAITCHECK 1000
- #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_WRITE, data, sizeof(data), PIMORONI_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;
- }
- }
-
- 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; }
-
- __attribute__((weak)) void pointing_device_init(void) { i2c_init(); trackball_set_rgbw(0x00, 0x00, 0x00, 0x00); }
-
- void pointing_device_task(void) {
- static bool debounce;
- static uint16_t debounce_timer;
- uint8_t state[5] = {};
- if (timer_elapsed(i2c_timeout_timer) > I2C_WAITCHECK) {
- if (i2c_readReg(TRACKBALL_READ, 0x04, state, 5, PIMORONI_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();
- }
- }
- } else {
- i2c_timeout_timer = timer_read();
- }
- }
-
- if (timer_elapsed(debounce_timer) > MOUSE_DEBOUNCE) debounce = false;
-
- report_mouse_t mouse = pointing_device_get_report();
-
- #ifdef PIMORONI_TRACKBALL_CLICK
- trackball_check_click(state[4] & (1 << 7), &mouse);
- #endif
-
- #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);
- pointing_device_send();
- }
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