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path: root/drivers/sensors/pimoroni_trackball.c
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Diffstat (limited to 'drivers/sensors/pimoroni_trackball.c')
-rw-r--r--drivers/sensors/pimoroni_trackball.c201
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(&current_pimoroni_data);
+
+ if (status == I2C_STATUS_SUCCESS) {
+ error_count = 0;
+
+ if (pointing_device_task_user(&current_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();
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-16 16:59:40 +0000