From fa05a5f8238e9e1417235711656e5062ccc843a7 Mon Sep 17 00:00:00 2001
From: "info@mode42.com" <info@mode42.com>
Date: Fri, 7 Aug 2026 18:23:28 +0000
Subject: Initial push

---
 stacks/max25-bcpr/include/bcpr/bcpr_hdlc.h | 57 ++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 stacks/max25-bcpr/include/bcpr/bcpr_hdlc.h

(limited to 'stacks/max25-bcpr/include/bcpr/bcpr_hdlc.h')

diff --git a/stacks/max25-bcpr/include/bcpr/bcpr_hdlc.h b/stacks/max25-bcpr/include/bcpr/bcpr_hdlc.h
new file mode 100644
index 0000000..0cf0bfb
--- /dev/null
+++ b/stacks/max25-bcpr/include/bcpr/bcpr_hdlc.h
@@ -0,0 +1,57 @@
+#ifndef BCPR_HDLC_H
+#define BCPR_HDLC_H
+
+#include "bcpr/bcpr.h"
+#include <stdint.h>
+
+typedef struct bcpr_hbuf {
+    unsigned rd, wr;
+    uint16_t buf[BCPR_HDLC_BUF];
+} bcpr_hbuf_t;
+
+typedef struct bcpr_channel {
+    int tx_delay, tx_tail, slottime, ppersist, fulldup;
+} bcpr_channel_t;
+
+typedef struct bcpr_hdlc {
+    int bitrate;
+    bcpr_channel_t ch;
+    bcpr_hbuf_t rx_hbuf;
+    bcpr_hbuf_t tx_hbuf;
+    int rx_state;
+    unsigned bitstream, bitbuf;
+    int numbits;
+    int dcd;
+    int rx_len;
+    uint8_t *rx_bp;
+    uint8_t rx_buffer[BCPR_MAXFLEN + 2];
+    int tx_state;
+    int numflags;
+    unsigned tx_bitstream;
+    int ptt;
+    int slotcnt;
+    unsigned tx_bitbuf;
+    int tx_numbits;
+    int tx_len;
+    uint8_t *tx_bp;
+    uint8_t tx_buffer[BCPR_MAXFLEN + 2];
+    /* pending KISS payload (without FEND/cmd) queued for TX */
+    uint8_t pending[BCPR_MAXFLEN];
+    int pending_len;
+    int have_pending;
+} bcpr_hdlc_t;
+
+void bcpr_hdlc_init(bcpr_hdlc_t *h, int bitrate, const bcpr_channel_t *ch);
+void bcpr_hdlc_putbits(bcpr_hdlc_t *h, unsigned bits);
+unsigned bcpr_hdlc_getbits(bcpr_hdlc_t *h);
+void bcpr_hdlc_receiver(bcpr_hdlc_t *h,
+                        void (*on_frame)(const uint8_t *kiss, int len, void *ud),
+                        void *ud);
+void bcpr_hdlc_transmitter(bcpr_hdlc_t *h);
+void bcpr_hdlc_arbitrate(bcpr_hdlc_t *h);
+int bcpr_hdlc_queue_kiss(bcpr_hdlc_t *h, const uint8_t *kiss, int len);
+int bcpr_hdlc_ptt(const bcpr_hdlc_t *h);
+/* Force idle TX — drop pending frame and clear keyed state. */
+void bcpr_hdlc_abort_tx(bcpr_hdlc_t *h);
+
+#endif
-- 
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