try to add usb gamepad to gameboy emulator
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Liz
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b3c43224b8
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1 changed files with 123 additions and 0 deletions
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@ -1183,6 +1183,10 @@ char * menuSelection(void)
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********************************/
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#ifdef HAS_USBHOST
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static bool gamepad_connected = false;
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static uint8_t gamepad_addr = 0;
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static uint8_t gamepad_instance = 0;
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#ifdef KEYBOARD_ACTIVATED
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static bool kbdasjoy = false;
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#else
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@ -1221,6 +1225,125 @@ static void signal_joy (int code, int pressed, int flags) {
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void kbd_signal_raw_key (int keycode, int code, int codeshifted, int flags, int pressed) {
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//printf("k %d\r\n", keycode);
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static void process_gamepad_report(uint8_t const* report, uint16_t len) {
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// Check if we have enough data
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if (len < 9) return;
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// Clear previous gamepad state while preserving keyboard input
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uint16_t kbd_state = usbnavpad & (MASK_OSKB);
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usbnavpad = kbd_state;
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// D-pad emulation from left analog stick (bytes 1 & 2)
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// X-axis: 0x00=left, 0x7F=center, 0xFF=right
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// Y-axis: 0x00=up, 0x7F=center, 0xFF=down
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uint8_t x_axis = report[1];
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uint8_t y_axis = report[2];
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// Apply some deadzone (values near center should be ignored)
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// Horizontal movement
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if (x_axis < 0x40) {
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usbnavpad |= MASK_JOY2_LEFT;
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} else if (x_axis > 0xB0) {
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usbnavpad |= MASK_JOY2_RIGHT;
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}
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// Vertical movement
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if (y_axis < 0x40) {
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usbnavpad |= MASK_JOY2_UP;
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} else if (y_axis > 0xB0) {
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usbnavpad |= MASK_JOY2_DOWN;
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}
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// Face buttons (byte 6)
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uint8_t face_buttons = report[6] & 0xF0; // Mask out the base value (0x0F)
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if (face_buttons & 0x20) usbnavpad |= MASK_JOY2_BTN; // A button
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if (face_buttons & 0x40) usbnavpad |= MASK_KEY_USER1; // B button
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if (face_buttons & 0x10) usbnavpad |= MASK_KEY_USER2; // X button
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if (face_buttons & 0x80) usbnavpad |= MASK_KEY_USER3; // Y button
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// Shoulder and menu buttons (byte 7)
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if (report[7] & 0x01) usbnavpad |= MASK_JOY1_BTN; // L button
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if (report[7] & 0x02) usbnavpad |= MASK_KEY_USER4; // R button
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if (report[7] & 0x10) usbnavpad |= MASK_KEY_USER2; // Select (alt mapping)
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if (report[7] & 0x20) usbnavpad |= MASK_KEY_USER1; // Start (alt mapping)
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}
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// TinyUSB callbacks for HID devices
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// Invoked when device with hid interface is mounted
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bool tuh_hid_mount_cb(uint8_t dev_addr, uint8_t instance, uint8_t const* desc_report, uint16_t desc_len) {
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uint16_t vid, pid;
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tuh_vid_pid_get(dev_addr, &vid, &pid);
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printf("HID device: VID = 0x%04x, PID = 0x%04x\r\n", vid, pid);
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// Check if this is our known gamepad (Totsu Engineering, 0x081F/0xE401)
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if (vid == 0x081F && pid == 0xE401) {
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printf("USB gamepad detected\r\n");
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gamepad_connected = true;
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gamepad_addr = dev_addr;
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gamepad_instance = instance;
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tuh_hid_receive_report(dev_addr, instance);
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return true;
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}
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// Check for keyboard (existing code will handle this)
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uint8_t const itf_protocol = tuh_hid_interface_protocol(dev_addr, instance);
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if (itf_protocol == HID_ITF_PROTOCOL_KEYBOARD) {
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printf("USB keyboard detected\r\n");
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return true;
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}
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// Check for generic gamepad/joystick
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bool is_joystick = false;
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for (uint16_t i = 0; i < desc_len - 2; i++) {
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// Look for Generic Desktop usage page (0x01) followed by Joystick usage (0x04)
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if (desc_report[i] == 0x05 && desc_report[i+1] == 0x01 &&
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i+3 < desc_len && desc_report[i+2] == 0x09 && desc_report[i+3] == 0x04) {
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is_joystick = true;
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break;
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}
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}
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if (is_joystick) {
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printf("Generic USB joystick/gamepad detected\r\n");
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gamepad_connected = true;
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gamepad_addr = dev_addr;
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gamepad_instance = instance;
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tuh_hid_receive_report(dev_addr, instance);
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return true;
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}
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// Not a supported device
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return false;
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}
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// Invoked when device with hid interface is unmounted
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void tuh_hid_umount_cb(uint8_t dev_addr, uint8_t instance) {
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if (dev_addr == gamepad_addr && instance == gamepad_instance) {
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printf("Gamepad disconnected\r\n");
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gamepad_connected = false;
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gamepad_addr = 0;
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gamepad_instance = 0;
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// Clear gamepad input flags
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usbnavpad &= MASK_OSKB; // Keep only the on-screen keyboard state
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}
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}
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// Invoked when received report from device
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void tuh_hid_report_received_cb(uint8_t dev_addr, uint8_t instance, uint8_t const* report, uint16_t len) {
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if (dev_addr == gamepad_addr && instance == gamepad_instance) {
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// Process gamepad report
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process_gamepad_report(report, len);
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}
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// Request to receive report again
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tuh_hid_receive_report(dev_addr, instance);
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}
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#endif
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#ifdef FILEBROWSER
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if (menuActive())
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{
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