#2

1 files changed, 61 insertions, 0 deletions

diff --git a/include/hybbx/kiss.h b/include/hybbx/kiss.h
new file mode 100644
index 0000000..9cd378d
--- /dev/null
+++ b/include/hybbx/kiss.h
@@ -0,0 +1,61 @@
+#ifndef HYBBX_KISS_H
+#define HYBBX_KISS_H
+
+#include "hybbx/types.h"
+
+#include <stddef.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define HYBBX_KISS_FEND  0xC0u
+#define HYBBX_KISS_FESC  0xDBu
+#define HYBBX_KISS_TFEND 0xDCu
+#define HYBBX_KISS_TFESC 0xDDu
+
+typedef enum hybbx_kiss_command {
+    HYBBX_KISS_CMD_DATA = 0x00,
+    HYBBX_KISS_CMD_TXDELAY = 0x01,
+    HYBBX_KISS_CMD_PERSIST = 0x02,
+    HYBBX_KISS_CMD_SLOTTIME = 0x03,
+    HYBBX_KISS_CMD_TXTAIL = 0x04,
+    HYBBX_KISS_CMD_FULLDUPLEX = 0x05,
+    HYBBX_KISS_CMD_SETHARDWARE = 0x06
+} hybbx_kiss_command_t;
+
+#define HYBBX_KISS_MAX_FRAME 2048
+
+typedef void (*hybbx_kiss_frame_cb)(uint8_t port, const uint8_t *frame,
+                                    size_t len, void *userdata);
+
+typedef struct hybbx_kiss_decoder {
+    uint8_t buf[HYBBX_KISS_MAX_FRAME];
+    size_t len;
+    int in_frame;
+    int escape;
+} hybbx_kiss_decoder_t;
+
+void hybbx_kiss_decoder_init(hybbx_kiss_decoder_t *dec);
+
+/**
+ * Feed raw serial bytes; complete KISS frames invoke @p cb.
+ */
+void hybbx_kiss_decoder_feed(hybbx_kiss_decoder_t *dec,
+                             const uint8_t *data, size_t len,
+                             hybbx_kiss_frame_cb cb, void *userdata);
+
+/**
+ * Encode a KISS frame into @p out (must hold at least @p out_cap bytes).
+ * Returns encoded length or 0 on error.
+ */
+size_t hybbx_kiss_encode(uint8_t port, hybbx_kiss_command_t cmd,
+                         const uint8_t *payload, size_t payload_len,
+                         uint8_t *out, size_t out_cap);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HYBBX_KISS_H */