95 lines
3.5 KiB
C
95 lines
3.5 KiB
C
/* Copyright 2020 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
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* Copyright 2021 Dasky (@daskygit)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "pointing_device_internal.h"
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#include "pimoroni_trackball.h"
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#include "i2c_master.h"
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#include "timer.h"
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// clang-format off
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#define PIMORONI_TRACKBALL_REG_LED_RED 0x00
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#define PIMORONI_TRACKBALL_REG_LED_GRN 0x01
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#define PIMORONI_TRACKBALL_REG_LED_BLU 0x02
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#define PIMORONI_TRACKBALL_REG_LED_WHT 0x03
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#define PIMORONI_TRACKBALL_REG_LEFT 0x04
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#define PIMORONI_TRACKBALL_REG_RIGHT 0x05
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#define PIMORONI_TRACKBALL_REG_UP 0x06
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#define PIMORONI_TRACKBALL_REG_DOWN 0x07
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// clang-format on
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static uint16_t precision = 128;
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uint16_t pimoroni_trackball_get_cpi(void) {
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return (precision * 125);
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}
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/**
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* @brief Sets the scaling value for pimoroni trackball
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*
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* Sets a scaling value for pimoroni trackball to allow runtime adjustment. This isn't used by the sensor and is an
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* approximation so the functions are consistent across drivers.
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*
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* NOTE: This rounds down to the nearest number divisable by 125 that's a positive integer, values below 125 are clamped to 125.
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*
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* @param cpi uint16_t
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*/
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void pimoroni_trackball_set_cpi(uint16_t cpi) {
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if (cpi < 249) {
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precision = 1;
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} else {
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precision = (cpi - (cpi % 125)) / 125;
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}
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}
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void pimoroni_trackball_set_rgbw(uint8_t r, uint8_t g, uint8_t b, uint8_t w) {
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uint8_t data[4] = {r, g, b, w};
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__attribute__((unused)) i2c_status_t status = i2c_write_register(PIMORONI_TRACKBALL_ADDRESS << 1, PIMORONI_TRACKBALL_REG_LED_RED, data, sizeof(data), PIMORONI_TRACKBALL_TIMEOUT);
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pd_dprintf("Trackball RGBW i2c_status_t: %d\n", status);
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}
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i2c_status_t read_pimoroni_trackball(pimoroni_data_t* data) {
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i2c_status_t status = i2c_read_register(PIMORONI_TRACKBALL_ADDRESS << 1, PIMORONI_TRACKBALL_REG_LEFT, (uint8_t*)data, sizeof(*data), PIMORONI_TRACKBALL_TIMEOUT);
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#ifdef POINTING_DEVICE_DEBUG
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static uint16_t d_timer;
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if (timer_elapsed(d_timer) > PIMORONI_TRACKBALL_DEBUG_INTERVAL) {
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pd_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);
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d_timer = timer_read();
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}
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#endif
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return status;
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}
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__attribute__((weak)) void pimoroni_trackball_device_init(void) {
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i2c_init();
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pimoroni_trackball_set_rgbw(0x00, 0x00, 0x00, 0x00);
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}
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int16_t pimoroni_trackball_get_offsets(uint8_t negative_dir, uint8_t positive_dir, uint8_t scale) {
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uint8_t offset = 0;
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bool isnegative = false;
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if (negative_dir > positive_dir) {
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offset = negative_dir - positive_dir;
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isnegative = true;
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} else {
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offset = positive_dir - negative_dir;
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}
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uint16_t magnitude = (scale * offset * offset * precision) >> 7;
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return isnegative ? -(int16_t)(magnitude) : (int16_t)(magnitude);
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}
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