/* 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(); } }