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-rw-r--r--users/drashna/pimoroni_trackball.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/users/drashna/pimoroni_trackball.c b/users/drashna/pimoroni_trackball.c
new file mode 100644
index 0000000000..c5bb560b35
--- /dev/null
+++ b/users/drashna/pimoroni_trackball.c
@@ -0,0 +1,114 @@
+#include "pimoroni_trackball.h"
+#include "i2c_master.h"
+
+static uint8_t scrolling = 0;
+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 float precisionSpeed = 1;
+
+#ifndef I2C_TIMEOUT
+# define I2C_TIMEOUT 100
+#endif
+#ifndef MOUSE_DEBOUNCE
+# define MOUSE_DEBOUNCE 5
+#endif
+
+void trackball_set_rgbw(uint8_t red, uint8_t green, uint8_t blue, uint8_t white) {
+ uint8_t data[] = {0x00, red, green, blue, white};
+ i2c_transmit(TRACKBALL_WRITE, data, sizeof(data), I2C_TIMEOUT);
+}
+
+int16_t mouse_offset(uint8_t positive, uint8_t negative, int16_t scale) {
+ int16_t offset = (int16_t)positive - (int16_t)negative;
+ int16_t magnitude = (int16_t)(scale * offset * offset * precisionSpeed);
+ return offset < 0 ? -magnitude : magnitude;
+}
+
+void update_member(int8_t* member, int16_t* offset) {
+ if (*offset > 127) {
+ *member = 127;
+ *offset -= 127;
+ } else if (*offset < -127) {
+ *member = -127;
+ *offset += 127;
+ } else {
+ *member = *offset;
+ *offset = 0;
+ }
+}
+
+__attribute__((weak)) void trackball_check_click(bool pressed, report_mouse_t* mouse) {
+ if (pressed) {
+ mouse->buttons |= MOUSE_BTN1;
+ } else {
+ mouse->buttons &= ~MOUSE_BTN1;
+ }
+}
+
+float trackball_get_precision(void) { return precisionSpeed; }
+void trackball_set_precision(float precision) { precisionSpeed = precision; }
+bool trackball_is_scrolling(void) { return scrolling; }
+void trackball_set_scrolling(bool scroll) { scrolling = scroll; }
+
+__attribute__((weak)) void pointing_device_init(void) { trackball_set_rgbw(0x00,0x00,0x00,0x4F); }
+
+void pointing_device_task(void) {
+ static bool debounce;
+ static uint16_t debounce_timer;
+ uint8_t state[5] = {};
+ if (i2c_readReg(TRACKBALL_WRITE, 0x04, state, 5, I2C_TIMEOUT) == I2C_STATUS_SUCCESS) {
+ if (!state[4] && !debounce) {
+ if (scrolling) {
+#ifdef PIMORONI_TRACKBALL_INVERT_X
+ h_offset += mouse_offset(state[2], state[3], 1);
+#else
+ h_offset -= mouse_offset(state[2], state[3], 1);
+#endif
+#ifdef PIMORONI_TRACKBALL_INVERT_Y
+ v_offset += mouse_offset(state[1], state[0], 1);
+#else
+ v_offset -= mouse_offset(state[1], state[0], 1);
+#endif
+ } else {
+#ifdef PIMORONI_TRACKBALL_INVERT_X
+ x_offset -= mouse_offset(state[2], state[3], 5);
+#else
+ x_offset += mouse_offset(state[2], state[3], 5);
+#endif
+#ifdef PIMORONI_TRACKBALL_INVERT_Y
+ y_offset -= mouse_offset(state[1], state[0], 5);
+#else
+ y_offset += mouse_offset(state[1], state[0], 5);
+#endif
+ }
+ } else {
+ if (state[4]) {
+ debounce = true;
+ debounce_timer = timer_read();
+ }
+ }
+ }
+
+ if (timer_elapsed(debounce_timer) > MOUSE_DEBOUNCE) debounce = false;
+
+ report_mouse_t mouse = pointing_device_get_report();
+
+ trackball_check_click(state[4] & (1 << 7), &mouse);
+
+
+#ifndef PIMORONI_TRACKBALL_ROTATE
+ update_member(&mouse.x, &x_offset);
+ update_member(&mouse.y, &y_offset);
+ update_member(&mouse.h, &h_offset);
+ update_member(&mouse.v, &v_offset);
+#else
+ update_member(&mouse.x, &y_offset);
+ update_member(&mouse.y, &x_offset);
+ update_member(&mouse.h, &v_offset);
+ update_member(&mouse.v, &h_offset);
+#endif
+ pointing_device_set_report(mouse);
+ pointing_device_send();
+}