+ uint8_t len;
+ uint8_t buf[5];
+ int16_t x, y;
+ static int8_t mouseacc;
+
+ /* tick of last polling */
+ static uint16_t tick_ms;
+
+ // polling with 12ms interval
+ if (timer_elapsed(tick_ms) < 12) return;
+ tick_ms = timer_read();
+
+ static uint16_t detect_ms;
+ if (timer_elapsed(detect_ms) > 1000) {
+ detect_ms = timer_read();
+ // check new device on addr3
+ mouse_init(ADB_ADDR_MOUSE);
+ }
+
+ // Extended Mouse Protocol data can be 2-5 bytes
+ // https://developer.apple.com/library/archive/technotes/hw/hw_01.html#Extended
+ //
+ // Byte 0: b00 y06 y05 y04 y03 y02 y01 y00
+ // Byte 1: b01 x06 x05 x04 x03 x02 x01 x00
+ // Byte 2: b02 y09 y08 y07 b03 x09 x08 x07
+ // Byte 3: b04 y12 y11 y10 b05 x12 x11 x10
+ // Byte 4: b06 y15 y14 y13 b07 x15 x14 x13
+ //
+ // b--: Button state.(0: on, 1: off)
+ // x--: X axis movement.
+ // y--: Y axis movement.
+ len = adb_host_talk_buf(ADB_ADDR_MOUSE_POLL, ADB_REG_0, buf, sizeof(buf));
+
+ // If nothing received reset mouse acceleration, and quit.
+ if (len < 2) {
+ mouseacc = 1;
+ return;
+ };
+ dmprintf("[%02X %02X %02X %02X %02X]\n", buf[0], buf[1], buf[2], buf[3], buf[4]);
+
+ // Store off-buttons and 0-movements in unused bytes
+ bool xneg = false;
+ bool yneg = false;
+ if (len == 2) {
+ if (buf[0] & 0x40) yneg = true;
+ if (buf[1] & 0x40) xneg = true;
+ } else {
+ if (buf[len - 1] & 0x40) yneg = true;
+ if (buf[len - 1] & 0x04) xneg = true;
+ }
+
+ for (int8_t i = len; i < sizeof(buf); i++) {
+ buf[i] = 0x88;
+ if (yneg) buf[i] |= 0x70;
+ if (xneg) buf[i] |= 0x07;
+ }
+
+ // 8 buttons at max
+ // TODO: Fix HID report descriptor for mouse to support button6-8
+ uint8_t buttons = 0;
+ if (!(buf[4] & 0x08)) buttons |= MOUSE_BTN8;
+ if (!(buf[4] & 0x80)) buttons |= MOUSE_BTN7;
+ if (!(buf[3] & 0x08)) buttons |= MOUSE_BTN6;
+ if (!(buf[3] & 0x80)) buttons |= MOUSE_BTN5;
+ if (!(buf[2] & 0x08)) buttons |= MOUSE_BTN4;
+ if (!(buf[2] & 0x80)) buttons |= MOUSE_BTN3;
+ if (!(buf[1] & 0x80)) buttons |= MOUSE_BTN2;
+ if (!(buf[0] & 0x80)) buttons |= MOUSE_BTN1;
+ mouse_report.buttons = buttons;
+
+ int16_t xx, yy;
+ yy = (buf[0] & 0x7F) | (buf[2] & 0x70) << 3 | (buf[3] & 0x70) << 6 | (buf[4] & 0x70) << 9;
+ xx = (buf[1] & 0x7F) | (buf[2] & 0x07) << 7 | (buf[3] & 0x07) << 10 | (buf[4] & 0x07) << 13;
+
+ // Accelerate mouse. (They weren't meant to be used on screens larger than 320x200).
+ x = xx * mouseacc;
+ y = yy * mouseacc;
+
+ // TODO: Fix HID report descriptor for mouse to support finer resolution
+ // Cap our two bytes per axis to one byte.
+ // Easier with a MIN-function, but since -MAX(-a,-b) = MIN(a,b)...
+ // I.E. MIN(MAX(x,-127),127) = -MAX(-MAX(x, -127), -127) = MIN(-MIN(-x,127),127)
+ mouse_report.x = -MAX(-MAX(x, -127), -127);
+ mouse_report.y = -MAX(-MAX(y, -127), -127);
+
+ dmprintf("[B:%02X X:%d(%d) Y:%d(%d) A:%d]\n", mouse_report.buttons, mouse_report.x, xx, mouse_report.y, yy, mouseacc);
+
+ // Send result by usb.
+ host_mouse_send(&mouse_report);
+
+ // TODO: acceleration curve is needed for precise operation?
+ // increase acceleration of mouse
+ mouseacc += ( mouseacc < (mouse_cpi < 200 ? ADB_MOUSE_MAXACC : ADB_MOUSE_MAXACC/2) ? 1 : 0 );
+
+ return;