- /* Copyright 2020 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
- * Copyright 2021 Dasky (@daskygit)
- *
- * 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"
- #include "print.h"
- #include "debug.h"
- #include "timer.h"
-
- // clang-format off
- #define PIMORONI_TRACKBALL_REG_LED_RED 0x00
- #define PIMORONI_TRACKBALL_REG_LED_GRN 0x01
- #define PIMORONI_TRACKBALL_REG_LED_BLU 0x02
- #define PIMORONI_TRACKBALL_REG_LED_WHT 0x03
- #define PIMORONI_TRACKBALL_REG_LEFT 0x04
- #define PIMORONI_TRACKBALL_REG_RIGHT 0x05
- #define PIMORONI_TRACKBALL_REG_UP 0x06
- #define PIMORONI_TRACKBALL_REG_DOWN 0x07
- // clang-format on
-
- static uint16_t precision = 128;
-
- uint16_t pimoroni_trackball_get_cpi(void) {
- return (precision * 125);
- }
- /**
- * @brief Sets the scaling value for pimoroni trackball
- *
- * Sets a scaling value for pimoroni trackball to allow runtime adjustment. This isn't used by the sensor and is an
- * approximation so the functions are consistent across drivers.
- *
- * NOTE: This rounds down to the nearest number divisable by 125 that's a positive integer, values below 125 are clamped to 125.
- *
- * @param cpi uint16_t
- */
- void pimoroni_trackball_set_cpi(uint16_t cpi) {
- if (cpi < 249) {
- precision = 1;
- } else {
- precision = (cpi - (cpi % 125)) / 125;
- }
- }
-
- void pimoroni_trackball_set_rgbw(uint8_t r, uint8_t g, uint8_t b, uint8_t w) {
- uint8_t data[4] = {r, g, b, w};
- __attribute__((unused)) i2c_status_t status = i2c_writeReg(PIMORONI_TRACKBALL_ADDRESS << 1, PIMORONI_TRACKBALL_REG_LED_RED, data, sizeof(data), PIMORONI_TRACKBALL_TIMEOUT);
-
- #ifdef CONSOLE_ENABLE
- if (debug_mouse) dprintf("Trackball RGBW i2c_status_t: %d\n", status);
- #endif
- }
-
- i2c_status_t read_pimoroni_trackball(pimoroni_data_t* data) {
- i2c_status_t status = i2c_readReg(PIMORONI_TRACKBALL_ADDRESS << 1, PIMORONI_TRACKBALL_REG_LEFT, (uint8_t*)data, sizeof(*data), PIMORONI_TRACKBALL_TIMEOUT);
- #ifdef CONSOLE_ENABLE
- if (debug_mouse) {
- static uint16_t d_timer;
- if (timer_elapsed(d_timer) > PIMORONI_TRACKBALL_DEBUG_INTERVAL) {
- dprintf("Trackball READ i2c_status_t: %d L: %d R: %d Up: %d D: %d SW: %d\n", status, data->left, data->right, data->up, data->down, data->click);
- d_timer = timer_read();
- }
- }
- #endif
-
- return status;
- }
-
- __attribute__((weak)) void pimoroni_trackball_device_init(void) {
- i2c_init();
- pimoroni_trackball_set_rgbw(0x00, 0x00, 0x00, 0x00);
- }
-
- int16_t pimoroni_trackball_get_offsets(uint8_t negative_dir, uint8_t positive_dir, uint8_t scale) {
- uint8_t offset = 0;
- bool isnegative = false;
- if (negative_dir > positive_dir) {
- offset = negative_dir - positive_dir;
- isnegative = true;
- } else {
- offset = positive_dir - negative_dir;
- }
- uint16_t magnitude = (scale * offset * offset * precision) >> 7;
- return isnegative ? -(int16_t)(magnitude) : (int16_t)(magnitude);
- }
-
- void pimoroni_trackball_adapt_values(int8_t* mouse, int16_t* offset) {
- if (*offset > 127) {
- *mouse = 127;
- *offset -= 127;
- } else if (*offset < -127) {
- *mouse = -127;
- *offset += 127;
- } else {
- *mouse = *offset;
- *offset = 0;
- }
- }
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