From 0ca5ab0e1dddd654bad4d2215eb72ddbbd959850 Mon Sep 17 00:00:00 2001
From: Linar Yusupov <linar.r.yusupov@gmail.com>
Date: Tue, 14 May 2024 10:18:04 +0300
Subject: [PATCH] [Legacy] a placeholder for recent Air V7

---
 .../SoftRF/src/protocol/radio/Legacy.cpp      | 36 +++++++++++++++++++
 .../source/SoftRF/src/protocol/radio/Legacy.h | 35 +++++++++++++++++-
 2 files changed, 70 insertions(+), 1 deletion(-)

diff --git a/software/firmware/source/SoftRF/src/protocol/radio/Legacy.cpp b/software/firmware/source/SoftRF/src/protocol/radio/Legacy.cpp
index 03af95127..468ca4050 100644
--- a/software/firmware/source/SoftRF/src/protocol/radio/Legacy.cpp
+++ b/software/firmware/source/SoftRF/src/protocol/radio/Legacy.cpp
@@ -141,11 +141,19 @@ static const uint32_t table[8] = LEGACY_KEY1;
 void make_key(uint32_t key[4], uint32_t timestamp, uint32_t address) {
     int8_t i, ndx;
     for (i = 0; i < 4; i++) {
+#if USE_AIR_V6
         ndx = ((timestamp >> 23) & 1) ? i+4 : i ;
+#elif USE_AIR_V7
+        ndx = i ;
+#else
+#error "Unknown AIR protocol version"
+#endif /* USE_AIR_Vx */
         key[i] = obscure(table[ndx] ^ ((timestamp >> 6) ^ address), LEGACY_KEY2) ^ LEGACY_KEY3;
     }
 }
 
+#if USE_AIR_V6
+
 bool legacy_decode(void *legacy_pkt, ufo_t *this_aircraft, ufo_t *fop) {
 
     legacy_packet_t *pkt = (legacy_packet_t *) legacy_pkt;
@@ -319,3 +327,31 @@ size_t legacy_encode(void *legacy_pkt, ufo_t *this_aircraft) {
 
     return (sizeof(legacy_packet_t));
 }
+
+#elif USE_AIR_V7
+/*
+ * Volunteer contributors are welcome:
+ * https://pastebin.com/YB1ppAbt
+ */
+
+bool legacy_decode(void *legacy_pkt, ufo_t *this_aircraft, ufo_t *fop) {
+
+    legacy_packet_t *pkt = (legacy_packet_t *) legacy_pkt;
+
+    /* TODO */
+
+    return false /* true */;
+}
+
+size_t legacy_encode(void *legacy_pkt, ufo_t *this_aircraft) {
+
+    legacy_packet_t *pkt = (legacy_packet_t *) legacy_pkt;
+
+    /* TODO */
+
+    return (sizeof(legacy_packet_t));
+}
+
+#else
+#error "Unknown AIR protocol version"
+#endif /* USE_AIR_Vx */
diff --git a/software/firmware/source/SoftRF/src/protocol/radio/Legacy.h b/software/firmware/source/SoftRF/src/protocol/radio/Legacy.h
index 913c31c9f..33762ef7e 100644
--- a/software/firmware/source/SoftRF/src/protocol/radio/Legacy.h
+++ b/software/firmware/source/SoftRF/src/protocol/radio/Legacy.h
@@ -35,8 +35,23 @@
 #define LEGACY_TX_INTERVAL_MIN 600 /* in ms */
 #define LEGACY_TX_INTERVAL_MAX 1400
 
+#define USE_AIR_V6             1
+#define USE_AIR_V7             0
+
+#if USE_AIR_V6
 #define LEGACY_KEY1 { 0xe43276df, 0xdca83759, 0x9802b8ac, 0x4675a56b, \
                       0xfc78ea65, 0x804b90ea, 0xb76542cd, 0x329dfa32 }
+#elif USE_AIR_V7
+/*
+ * Volunteer contributors are welcome:
+ * https://pastebin.com/YB1ppAbt
+ */
+
+#define LEGACY_KEY1 { 0xA5F9B21C, 0xAB3F9D12, 0xC6F34E34, 0xD72FA378 }
+#else
+#error "Unknown AIR protocol version"
+#endif /* USE_AIR_Vx */
+
 #define LEGACY_KEY2 0x045d9f3b
 #define LEGACY_KEY3 0x87b562f4
 
@@ -115,6 +130,8 @@ enum
 	TX_STATUS_ON
 };
 
+#if USE_AIR_V6
+
 typedef struct {
     /********************/
     unsigned int addr:24;
@@ -144,7 +161,23 @@ typedef struct {
     /********************/
 } __attribute__((packed)) legacy_packet_t;
 
-bool legacy_decode(void *, ufo_t *, ufo_t *);
+#elif USE_AIR_V7
+/*
+ * Volunteer contributors are welcome:
+ * https://pastebin.com/YB1ppAbt
+ */
+
+typedef struct {
+
+    /* TODO */
+
+} __attribute__((packed)) legacy_packet_t;
+
+#else
+#error "Unknown AIR protocol version"
+#endif /* USE_AIR_Vx */
+
+bool   legacy_decode(void *, ufo_t *, ufo_t *);
 size_t legacy_encode(void *, ufo_t *);
 
 extern const rf_proto_desc_t legacy_proto_desc;