diff options
Diffstat (limited to 'drivers/sensors/pimoroni_trackball.c')
| -rw-r--r-- | drivers/sensors/pimoroni_trackball.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/drivers/sensors/pimoroni_trackball.c b/drivers/sensors/pimoroni_trackball.c new file mode 100644 index 0000000000..48098ff0cc --- /dev/null +++ b/drivers/sensors/pimoroni_trackball.c @@ -0,0 +1,201 @@ +/* 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(); + } +} |