202 lines
7.9 KiB
C
202 lines
7.9 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 "pimoroni_trackball.h"
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#include "i2c_master.h"
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#include "print.h"
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#ifndef PIMORONI_TRACKBALL_ADDRESS
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# define PIMORONI_TRACKBALL_ADDRESS 0x0A
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#endif
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#ifndef PIMORONI_TRACKBALL_INTERVAL_MS
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# define PIMORONI_TRACKBALL_INTERVAL_MS 8
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#endif
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#ifndef PIMORONI_TRACKBALL_MOUSE_SCALE
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# define PIMORONI_TRACKBALL_MOUSE_SCALE 5
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#endif
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#ifndef PIMORONI_TRACKBALL_SCROLL_SCALE
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# define PIMORONI_TRACKBALL_SCROLL_SCALE 1
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#endif
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#ifndef PIMORONI_TRACKBALL_DEBOUNCE_CYCLES
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# define PIMORONI_TRACKBALL_DEBOUNCE_CYCLES 20
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#endif
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#ifndef PIMORONI_TRACKBALL_ERROR_COUNT
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# define PIMORONI_TRACKBALL_ERROR_COUNT 10
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#endif
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#define TRACKBALL_TIMEOUT 100
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#define TRACKBALL_REG_LED_RED 0x00
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#define TRACKBALL_REG_LED_GRN 0x01
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#define TRACKBALL_REG_LED_BLU 0x02
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#define TRACKBALL_REG_LED_WHT 0x03
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#define TRACKBALL_REG_LEFT 0x04
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#define TRACKBALL_REG_RIGHT 0x05
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#define TRACKBALL_REG_UP 0x06
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#define TRACKBALL_REG_DOWN 0x07
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static pimoroni_data current_pimoroni_data;
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static report_mouse_t mouse_report;
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static bool scrolling = false;
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static int16_t x_offset = 0;
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static int16_t y_offset = 0;
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static int16_t h_offset = 0;
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static int16_t v_offset = 0;
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static uint16_t precision = 128;
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static uint8_t error_count = 0;
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float trackball_get_precision(void) { return ((float)precision / 128); }
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void trackball_set_precision(float floatprecision) { precision = (floatprecision * 128); }
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bool trackball_is_scrolling(void) { return scrolling; }
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void trackball_set_scrolling(bool scroll) { scrolling = scroll; }
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void 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_writeReg(PIMORONI_TRACKBALL_ADDRESS << 1, TRACKBALL_REG_LED_RED, data, sizeof(data), TRACKBALL_TIMEOUT);
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#ifdef TRACKBALL_DEBUG
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dprintf("Trackball RGBW i2c_status_t: %d\n", status);
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#endif
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}
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i2c_status_t read_pimoroni_trackball(pimoroni_data* data) {
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i2c_status_t status = i2c_readReg(PIMORONI_TRACKBALL_ADDRESS << 1, TRACKBALL_REG_LEFT, (uint8_t*)data, sizeof(*data), TRACKBALL_TIMEOUT);
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#ifdef TRACKBALL_DEBUG
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dprintf("Trackball READ i2c_status_t: %d\nLeft: %d\nRight: %d\nUp: %d\nDown: %d\nSwtich: %d\n", status, data->left, data->right, data->up, data->down, data->click);
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#endif
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return status;
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}
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__attribute__((weak)) void pointing_device_init(void) {
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i2c_init();
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trackball_set_rgbw(0x00, 0x00, 0x00, 0x00);
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}
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int16_t 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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void trackball_adapt_values(int8_t* mouse, int16_t* offset) {
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if (*offset > 127) {
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*mouse = 127;
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*offset -= 127;
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} else if (*offset < -127) {
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*mouse = -127;
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*offset += 127;
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} else {
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*mouse = *offset;
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*offset = 0;
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}
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}
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__attribute__((weak)) void trackball_click(bool pressed, report_mouse_t* mouse) {
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#ifdef PIMORONI_TRACKBALL_CLICK
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if (pressed) {
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mouse->buttons |= MOUSE_BTN1;
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} else {
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mouse->buttons &= ~MOUSE_BTN1;
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}
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#endif
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}
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__attribute__((weak)) bool pointing_device_task_user(pimoroni_data* trackball_data) { return true; };
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__attribute__((weak)) void pointing_device_task() {
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static fast_timer_t throttle = 0;
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static uint16_t debounce = 0;
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if (error_count < PIMORONI_TRACKBALL_ERROR_COUNT && timer_elapsed_fast(throttle) >= PIMORONI_TRACKBALL_INTERVAL_MS) {
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i2c_status_t status = read_pimoroni_trackball(¤t_pimoroni_data);
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if (status == I2C_STATUS_SUCCESS) {
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error_count = 0;
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if (pointing_device_task_user(¤t_pimoroni_data)) {
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mouse_report = pointing_device_get_report();
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if (!(current_pimoroni_data.click & 128)) {
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trackball_click(false, &mouse_report);
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if (!debounce) {
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if (scrolling) {
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#ifdef PIMORONI_TRACKBALL_INVERT_X
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h_offset += trackball_get_offsets(current_pimoroni_data.right, current_pimoroni_data.left, PIMORONI_TRACKBALL_SCROLL_SCALE);
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#else
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h_offset -= trackball_get_offsets(current_pimoroni_data.right, current_pimoroni_data.left, PIMORONI_TRACKBALL_SCROLL_SCALE);
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#endif
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#ifdef PIMORONI_TRACKBALL_INVERT_Y
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v_offset += trackball_get_offsets(current_pimoroni_data.down, current_pimoroni_data.up, PIMORONI_TRACKBALL_SCROLL_SCALE);
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#else
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v_offset -= trackball_get_offsets(current_pimoroni_data.down, current_pimoroni_data.up, PIMORONI_TRACKBALL_SCROLL_SCALE);
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#endif
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} else {
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#ifdef PIMORONI_TRACKBALL_INVERT_X
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x_offset -= trackball_get_offsets(current_pimoroni_data.right, current_pimoroni_data.left, PIMORONI_TRACKBALL_MOUSE_SCALE);
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#else
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x_offset += trackball_get_offsets(current_pimoroni_data.right, current_pimoroni_data.left, PIMORONI_TRACKBALL_MOUSE_SCALE);
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#endif
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#ifdef PIMORONI_TRACKBALL_INVERT_Y
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y_offset -= trackball_get_offsets(current_pimoroni_data.down, current_pimoroni_data.up, PIMORONI_TRACKBALL_MOUSE_SCALE);
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#else
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y_offset += trackball_get_offsets(current_pimoroni_data.down, current_pimoroni_data.up, PIMORONI_TRACKBALL_MOUSE_SCALE);
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#endif
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}
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if (scrolling) {
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#ifndef PIMORONI_TRACKBALL_ROTATE
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trackball_adapt_values(&mouse_report.h, &h_offset);
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trackball_adapt_values(&mouse_report.v, &v_offset);
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#else
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trackball_adapt_values(&mouse_report.h, &v_offset);
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trackball_adapt_values(&mouse_report.v, &h_offset);
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#endif
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mouse_report.x = 0;
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mouse_report.y = 0;
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} else {
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#ifndef PIMORONI_TRACKBALL_ROTATE
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trackball_adapt_values(&mouse_report.x, &x_offset);
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trackball_adapt_values(&mouse_report.y, &y_offset);
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#else
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trackball_adapt_values(&mouse_report.x, &y_offset);
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trackball_adapt_values(&mouse_report.y, &x_offset);
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#endif
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mouse_report.h = 0;
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mouse_report.v = 0;
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}
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} else {
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debounce--;
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}
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} else {
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trackball_click(true, &mouse_report);
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debounce = PIMORONI_TRACKBALL_DEBOUNCE_CYCLES;
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}
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}
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} else {
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error_count++;
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}
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pointing_device_set_report(mouse_report);
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pointing_device_send();
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throttle = timer_read_fast();
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}
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}
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