From 5bd75b9d5d207e6b2b40a9f323281b96f6faf4dc Mon Sep 17 00:00:00 2001
From: Vladislav Ostapov <Vlados.ost.31@yandex.ru>
Date: Sat, 10 Jan 2026 16:41:59 +0300
Subject: [PATCH] =?UTF-8?q?=D1=84=D0=B8=D0=BA=D1=81=20=D0=BF=D0=B5=D1=80?=
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---
 air/main.cpp | 94 +++++++++++++++++++++++++++++-----------------------
 1 file changed, 53 insertions(+), 41 deletions(-)

diff --git a/air/main.cpp b/air/main.cpp
index 70b1ad4..a923bf9 100644
--- a/air/main.cpp
+++ b/air/main.cpp
@@ -95,8 +95,8 @@ struct SbusData {
     bool failsafe = false;
     bool ch17 = false, ch18 = false;
     static constexpr size_t NUM_CH = 18;
-    static constexpr int16_t SBUS_CH_MIN = 173 + 10;
-    static constexpr int16_t SBUS_CH_MAX = 1812 - 10;
+    static constexpr int16_t SBUS_CH_MIN = 173 + 20;
+    static constexpr int16_t SBUS_CH_MAX = 1812 - 20;
     int16_t ch[NUM_CH];
 
     /* Message len */
@@ -112,42 +112,42 @@ struct SbusData {
     static constexpr uint8_t FAILSAFE_MASK_ = 0x08;
     uint8_t binaryBuffer[25];
 
-    void fillDataBuf() {
-        typedef struct sbusChannels_s {
-            // 176 bits of data (11 bits per channel * 16 channels) = 22 bytes.
-            unsigned int chan0 : 11;
-            unsigned int chan1 : 11;
-            unsigned int chan2 : 11;
-            unsigned int chan3 : 11;
-            unsigned int chan4 : 11;
-            unsigned int chan5 : 11;
-            unsigned int chan6 : 11;
-            unsigned int chan7 : 11;
-            unsigned int chan8 : 11;
-            unsigned int chan9 : 11;
-            unsigned int chan10 : 11;
-            unsigned int chan11 : 11;
-            unsigned int chan12 : 11;
-            unsigned int chan13 : 11;
-            unsigned int chan14 : 11;
-            unsigned int chan15 : 11;
-        } __attribute__((__packed__)) sbusChannels_t;
-        static_assert(sizeof(sbusChannels_s) == 22);
-        struct sbusFrame_s {
-            uint8_t syncByte = HEADER_;
-            sbusChannels_t channels{};
-            uint8_t flags{};
-            /**
-             * The endByte is 0x00 on FrSky and some futaba RX's, on Some SBUS2 RX's the value indicates the telemetry byte that is sent after every 4th sbus frame.
-             *
-             * See https://github.com/cleanflight/cleanflight/issues/590#issuecomment-101027349
-             * and
-             * https://github.com/cleanflight/cleanflight/issues/590#issuecomment-101706023
-             */
-            uint8_t endByte = FOOTER_;
-        } __attribute__ ((__packed__));
-        static_assert(sizeof(sbusFrame_s) == sizeof(binaryBuffer));
+    typedef struct sbusChannels_s {
+        // 176 bits of data (11 bits per channel * 16 channels) = 22 bytes.
+        unsigned int chan0 : 11;
+        unsigned int chan1 : 11;
+        unsigned int chan2 : 11;
+        unsigned int chan3 : 11;
+        unsigned int chan4 : 11;
+        unsigned int chan5 : 11;
+        unsigned int chan6 : 11;
+        unsigned int chan7 : 11;
+        unsigned int chan8 : 11;
+        unsigned int chan9 : 11;
+        unsigned int chan10 : 11;
+        unsigned int chan11 : 11;
+        unsigned int chan12 : 11;
+        unsigned int chan13 : 11;
+        unsigned int chan14 : 11;
+        unsigned int chan15 : 11;
+    } __attribute__((__packed__)) sbusChannels_t;
+    static_assert(sizeof(sbusChannels_s) == 22);
+    struct sbusFrame_s {
+        uint8_t syncByte = HEADER_;
+        sbusChannels_t channels{};
+        uint8_t flags{};
+        /**
+         * The endByte is 0x00 on FrSky and some futaba RX's, on Some SBUS2 RX's the value indicates the telemetry byte that is sent after every 4th sbus frame.
+         *
+         * See https://github.com/cleanflight/cleanflight/issues/590#issuecomment-101027349
+         * and
+         * https://github.com/cleanflight/cleanflight/issues/590#issuecomment-101706023
+         */
+        uint8_t endByte = FOOTER_;
+    } __attribute__ ((__packed__));
+    static_assert(sizeof(sbusFrame_s) == sizeof(binaryBuffer));
 
+    void fillDataBuf() {
         auto* dest = reinterpret_cast<sbusFrame_s*>(binaryBuffer);
         dest->syncByte = HEADER_;
         dest->channels.chan0 = std::min(std::max(ch[0], SBUS_CH_MIN), SBUS_CH_MAX);
@@ -169,7 +169,7 @@ struct SbusData {
 
         dest->flags = 0;
         if (ch[16] >= (SBUS_CH_MAX + SBUS_CH_MAX) / 2) { dest->flags |= CH17_MASK_; }
-        if (ch[16] >= (SBUS_CH_MAX + SBUS_CH_MAX) / 2) { dest->flags |= CH18_MASK_; }
+        if (ch[17] >= (SBUS_CH_MAX + SBUS_CH_MAX) / 2) { dest->flags |= CH18_MASK_; }
 
         dest->endByte = FOOTER_;
     }
@@ -234,6 +234,15 @@ public:
         return fd;
     }
 
+    int drain() {
+        int ret;
+        do {
+            ret = ioctl(fd, TCSBRK, 1);
+        } while (ret < 0 && errno == EINTR);
+
+        return ret;
+    }
+
     // Метод для записи данных в порт
     bool write(std::span<const uint8_t> data) {
         if (fd < 0) return false;
@@ -245,7 +254,10 @@ public:
         }
 
         // Принудительная отправка данных
-        // tcdrain(fd);
+        if (drain() < 0) {
+            std::cerr << "Failed to flush data to serial port" << std::endl;
+            return false;
+        }
         return true;
     }
 };
@@ -289,8 +301,8 @@ int main(int argc, char* argv[]) {
                 if (!data.empty()) {
                     packetCount++;
 
-                    for (int i = 0; i < data.size() && i < SbusData::NUM_CH; ++i) {
-                        auto item = static_cast<double>(data[i]);
+                    for (int i = 0; i < SbusData::NUM_CH; ++i) {
+                        auto item = i < data.size() ? static_cast<double>(data[i]) : 1500.0;
                         item -= 1000.0;
                         item = std::min(item, 1000.0);
                         item = std::max(item, 0.0);