From fbc66132e32bf91a5f8ccd9d5b2307961492669f Mon Sep 17 00:00:00 2001
From: Peter Barker <pbarker@barker.dropbear.id.au>
Date: Tue, 11 Jul 2023 17:05:31 +1000
Subject: [PATCH] AP_ADSB: correct bad port read in Sagetech driver

---
 libraries/AP_ADSB/AP_ADSB_Sagetech.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libraries/AP_ADSB/AP_ADSB_Sagetech.cpp b/libraries/AP_ADSB/AP_ADSB_Sagetech.cpp
index 6e610f9e90..5724ec9239 100644
--- a/libraries/AP_ADSB/AP_ADSB_Sagetech.cpp
+++ b/libraries/AP_ADSB/AP_ADSB_Sagetech.cpp
@@ -69,8 +69,8 @@ void AP_ADSB_Sagetech::update()
     // -----------------------------
     uint32_t nbytes = MIN(_port->available(), 10 * PAYLOAD_XP_MAX_SIZE);
     while (nbytes-- > 0) {
-        const int16_t data = (uint8_t)_port->read();
-        if (data < 0) {
+        uint8_t data;
+        if (!_port->read(data)) {
             break;
         }
         if (parse_byte_XP((uint8_t)data)) {