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Merge pull request #4 from adafruit/gamepad_gb
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add usb gamepad to gameboy emulator
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Limor "Ladyada" Fried 2025-04-09 11:58:58 -04:00 committed by GitHub
commit 40ed46a3a1
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GPG key ID: B5690EEEBB952194
1 changed files with 43 additions and 49 deletions
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62
MCUME_pico2/usb_kbd/hid_app.c
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@ -374,54 +374,48 @@ static void process_kbd_report (hid_keyboard_report_t const *report)
prev_report = *report; prev_report = *report;
} }
// this mapping is hard coded for a certain snes-style gamepad and picogb!
static void process_gamepad_report(const uint8_t *report) { static void process_gamepad_report(const uint8_t *report) {
uint16_t decoded_report = 0; uint16_t decoded_report = 0;
// X coordinate // Directional Controls
if (report[0] == 0) { // Left is when byte 2 is close to 0x00
decoded_report |= MASK_JOY2_RIGHT; if (report[0] < 0x40) {
} else if(report[0] == 0xff) { decoded_report |= MASK_JOY2_RIGHT; // Note: swapped due to gameboy mapping
decoded_report |= MASK_JOY2_LEFT;
} }
// Right is when byte 2 is close to 0xFF
// Y coordinate if (report[0] > 0xB0) {
if (report[1] == 0) { decoded_report |= MASK_JOY2_LEFT; // Note: swapped due to gameboy mapping
}
// Up is when byte 1 is close to 0x00
if (report[1] < 0x40) {
decoded_report |= MASK_JOY2_UP; decoded_report |= MASK_JOY2_UP;
} else if(report[1] == 0xff) { }
// Down is when byte 1 is close to 0xFF
if (report[1] > 0xB0) {
decoded_report |= MASK_JOY2_DOWN; decoded_report |= MASK_JOY2_DOWN;
} }
// X A B Y = top bits of byte 5 . Let's just have X/Y double A/B // A Button (check for 0x2F or 0x1F in byte 6)
if (report[5] & 0x10) { if ((report[5] & 0x20) || (report[5] & 0x10)) {
decoded_report |= MASK_JOY2_BTN; // X decoded_report |= MASK_KEY_USER3;
}
if (report[5] & 0x20) {
decoded_report |= MASK_KEY_USER3; // A -- this is picogb numbering
}
if (report[5] & 0x40) {
decoded_report |= MASK_JOY2_BTN; // B
}
if (report[5] & 0x80) {
decoded_report |= MASK_KEY_USER3; // Y
} }
// SELECT START = top bits of byte 6 // B Button (check for 0x4F or 0x8F in byte 6)
if ((report[5] & 0x40) || (report[5] & 0x80)) {
decoded_report |= MASK_JOY2_BTN;
}
// Select Button (byte 7, bit 0x10)
if (report[6] & 0x10) { if (report[6] & 0x10) {
decoded_report |= MASK_KEY_USER1; // SELECT decoded_report |= MASK_KEY_USER1;
} }
// Start Button (byte 7, bit 0x20)
if (report[6] & 0x20) { if (report[6] & 0x20) {
decoded_report |= MASK_KEY_USER2; // START decoded_report |= MASK_KEY_USER2;
}
// Decode shoulder buttons into B/A too
if (report[6] & 0x1) {
decoded_report |= MASK_JOY2_BTN; // B
}
if (report[6] & 0x2) {
decoded_report |= MASK_KEY_USER3; // Y
} }
// Send the decoded gamepad state
kbd_signal_raw_gamepad(decoded_report); kbd_signal_raw_gamepad(decoded_report);
} }
@ -487,7 +481,7 @@ int proto = tuh_hid_interface_protocol (dev_addr, instance);
process_kbd_report ((hid_keyboard_report_t const*) report); process_kbd_report ((hid_keyboard_report_t const*) report);
break; break;
case HID_ITF_PROTOCOL_NONE: case HID_ITF_PROTOCOL_NONE:
if (len == 8) { if (len >= 8) {
process_gamepad_report(report); process_gamepad_report(report);
} }
break; break;