From f6fa676411dc7318224d2f6b92c309bd7aca2bd9 Mon Sep 17 00:00:00 2001
From: Peter Barker <pbarker@barker.dropbear.id.au>
Date: Mon, 20 Dec 2021 19:08:33 +1100
Subject: [PATCH] AP_AIS: correct number of bytes to read from device

---
 libraries/AP_AIS/AP_AIS.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/AP_AIS/AP_AIS.cpp b/libraries/AP_AIS/AP_AIS.cpp
index 621dd84fe2..93f7c8f863 100644
--- a/libraries/AP_AIS/AP_AIS.cpp
+++ b/libraries/AP_AIS/AP_AIS.cpp
@@ -89,7 +89,7 @@ void AP_AIS::update()
     }
 
     // read any available lines
-    uint32_t nbytes = MAX(_uart->available(),1024U);
+    uint32_t nbytes = MIN(_uart->available(),1024U);
     while (nbytes-- > 0) {
         const int16_t byte = _uart->read();
         if (byte == -1) {