Check for POLL command in GamecubeConsole::Detect

BootMii sends POLL from the very start, rather than sending probe/origin
commands first, so the console detection should take this case into
account.

Resolves #4

src/GamecubeConsole.cpp

@@ -22,25 +22,28 @@ bool __no_inline_not_in_flash_func(GamecubeConsole::Detect)() {
 
     // We make at most 10 attempts to receive and respond to PROBE commands from a console. GameCube
     // and N64 both have the same PROBE command (0x00), so we don't know for sure that we're
-    // connected to a GameCube until we receive a GameCube ORIGIN command.
+    // connected to a GameCube until we receive a GameCube ORIGIN, RECALIBRATE, or POLL command.
     for (uint8_t attempts = 0; attempts < 10; attempts++) {
         // Always apply timeout (10ms), so that we don't block indefinitely if nothing is connected.
         if (joybus_receive_bytes(&_port, received, 1, 10'000, true) != 1) {
             continue;
         }
 
         switch ((GamecubeCommand)received[0]) {
-            case GamecubeCommand::RESET:
             case GamecubeCommand::PROBE:
+            case GamecubeCommand::RESET:
                 busy_wait_us(reply_delay);
                 joybus_send_bytes(&_port, (uint8_t *)&default_gc_status, sizeof(gc_status_t));
                 break;
-            case GamecubeCommand::RECALIBRATE:
             case GamecubeCommand::ORIGIN:
+            case GamecubeCommand::RECALIBRATE:
+                return true;
+            case GamecubeCommand::POLL:
+                WaitForPollEnd();
                 return true;
             default:
-                // If we received an invalid command, wait long enough for command
-                // to finish, then reset receiving.
+                // If we received an invalid command, wait long enough for command to finish, then
+                // reset receiving.
                 busy_wait_us(reset_wait_period_us);
                 joybus_port_reset(&_port);
         }
@@ -55,8 +58,7 @@ bool __no_inline_not_in_flash_func(GamecubeConsole::WaitForPoll)() {
         PollStatus status = WaitForPollEnd();
 
         if (status == PollStatus::ERROR) {
-            // If poll is invalid, wait long enough for command to finish, then
-            // reset receiving.
+            // If poll is invalid, wait long enough for command to finish, then reset receiving.
             busy_wait_us(reset_wait_period_us);
             joybus_port_reset(&_port);
             continue;