After commit c018f5fd29 Fenrir is being switched over to go. If you do not want to be part of the testing process, please switch to master.

internal/speech/hardware_native.h

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+// Copyright (c) 2026 Storm Dragon
+// SPDX-License-Identifier: GPL-3.0-or-later
+#ifndef FENRIR_SPEECH_HARDWARE_H
+#define FENRIR_SPEECH_HARDWARE_H
+#include <stddef.h>
+
+typedef struct SpeechSerial SpeechSerial;
+SpeechSerial *speech_serial_open(const char *path, int baud, int xon, int *status);
+int speech_serial_write(SpeechSerial *port, const void *data, size_t length);
+int speech_serial_cancel(SpeechSerial *port, unsigned char command);
+void speech_serial_close(SpeechSerial *port);
+
+typedef struct SpeechUSB SpeechUSB;
+int speech_usb_available(void);
+SpeechUSB *speech_usb_open(int *status);
+int speech_usb_write(SpeechUSB *port, unsigned char endpoint, void *data, int length);
+void speech_usb_close(SpeechUSB *port);
+#endif