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