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1 files changed, 30 insertions, 0 deletions

diff --git a/firmware/c1224/include/afsk_bitbang.h b/firmware/c1224/include/afsk_bitbang.h
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+++ b/firmware/c1224/include/afsk_bitbang.h
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+/**
+ * Bitbang / timed NRZI on TCM3105 TXD (GP6) and RXD (GP7).
+ * Rate matches stuffed crystal — compile C1224_BITRATE=1200|2400.
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+#ifndef C1224_AFSK_BITBANG_H
+#define C1224_AFSK_BITBANG_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifndef C1224_BITRATE
+#define C1224_BITRATE 1200
+#endif
+
+void afsk_bitbang_init(void);
+
+/** Transmit HDLC info payload (AX.25 frame without flags/FCS). Auto-PTT. */
+bool afsk_tx_frame(const uint8_t *info, size_t info_len);
+
+/** Poll RX sampler; call often from main loop. May emit via callback. */
+typedef void (*afsk_rx_frame_fn)(const uint8_t *info, size_t len);
+void afsk_rx_set_callback(afsk_rx_frame_fn fn);
+void afsk_rx_poll(void);
+
+bool afsk_tx_busy(void);
+unsigned afsk_bitrate(void);
+
+#endif /* C1224_AFSK_BITBANG_H */