115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
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#include "pimoroni_trackball.h"
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#include "i2c_master.h"
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static uint8_t scrolling = 0;
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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 float precisionSpeed = 1;
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#ifndef I2C_TIMEOUT
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# define I2C_TIMEOUT 100
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#endif
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#ifndef MOUSE_DEBOUNCE
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# define MOUSE_DEBOUNCE 5
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#endif
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void trackball_set_rgbw(uint8_t red, uint8_t green, uint8_t blue, uint8_t white) {
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uint8_t data[] = {0x00, red, green, blue, white};
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i2c_transmit(TRACKBALL_WRITE, data, sizeof(data), I2C_TIMEOUT);
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}
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int16_t mouse_offset(uint8_t positive, uint8_t negative, int16_t scale) {
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int16_t offset = (int16_t)positive - (int16_t)negative;
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int16_t magnitude = (int16_t)(scale * offset * offset * precisionSpeed);
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return offset < 0 ? -magnitude : magnitude;
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}
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void update_member(int8_t* member, int16_t* offset) {
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if (*offset > 127) {
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*member = 127;
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*offset -= 127;
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} else if (*offset < -127) {
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*member = -127;
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*offset += 127;
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} else {
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*member = *offset;
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*offset = 0;
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}
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}
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__attribute__((weak)) void trackball_check_click(bool pressed, report_mouse_t* mouse) {
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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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}
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float trackball_get_precision(void) { return precisionSpeed; }
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void trackball_set_precision(float precision) { precisionSpeed = precision; }
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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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__attribute__((weak)) void pointing_device_init(void) { trackball_set_rgbw(0x00,0x00,0x00,0x4F); }
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void pointing_device_task(void) {
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static bool debounce;
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static uint16_t debounce_timer;
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uint8_t state[5] = {};
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if (i2c_readReg(TRACKBALL_WRITE, 0x04, state, 5, I2C_TIMEOUT) == I2C_STATUS_SUCCESS) {
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if (!state[4] && !debounce) {
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if (scrolling) {
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#ifdef PIMORONI_TRACKBALL_INVERT_X
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h_offset += mouse_offset(state[2], state[3], 1);
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#else
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h_offset -= mouse_offset(state[2], state[3], 1);
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#endif
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#ifdef PIMORONI_TRACKBALL_INVERT_Y
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v_offset += mouse_offset(state[1], state[0], 1);
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#else
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v_offset -= mouse_offset(state[1], state[0], 1);
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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 -= mouse_offset(state[2], state[3], 5);
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#else
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x_offset += mouse_offset(state[2], state[3], 5);
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#endif
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#ifdef PIMORONI_TRACKBALL_INVERT_Y
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y_offset -= mouse_offset(state[1], state[0], 5);
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#else
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y_offset += mouse_offset(state[1], state[0], 5);
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#endif
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}
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} else {
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if (state[4]) {
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debounce = true;
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debounce_timer = timer_read();
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}
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}
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}
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if (timer_elapsed(debounce_timer) > MOUSE_DEBOUNCE) debounce = false;
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report_mouse_t mouse = pointing_device_get_report();
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trackball_check_click(state[4] & (1 << 7), &mouse);
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#ifndef PIMORONI_TRACKBALL_ROTATE
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update_member(&mouse.x, &x_offset);
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update_member(&mouse.y, &y_offset);
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update_member(&mouse.h, &h_offset);
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update_member(&mouse.v, &v_offset);
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#else
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update_member(&mouse.x, &y_offset);
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update_member(&mouse.y, &x_offset);
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update_member(&mouse.h, &v_offset);
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update_member(&mouse.v, &h_offset);
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#endif
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pointing_device_set_report(mouse);
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pointing_device_send();
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}
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