From 77caedcda2af85dda6bcc1be653e9df752b66b07 Mon Sep 17 00:00:00 2001
From: "Konstantin Sharlaimov (DigitalEntity)"
 <konstantin.sharlaimov@gmail.com>
Date: Thu, 26 Nov 2015 22:41:05 +1000
Subject: [PATCH] Limit I2C GPS retry rate to 1/500ms. Prevent I2C bus from
 being flooded by failed I2C transactions when no I2C-GPS is present

---
 src/main/io/gps.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/main/io/gps.c b/src/main/io/gps.c
index 62e3d22803..bfffdd0627 100755
--- a/src/main/io/gps.c
+++ b/src/main/io/gps.c
@@ -402,6 +402,13 @@ bool gpsDetectI2C(void)
 
 void gpsInitI2C(void)
 {
+    static uint32_t lastRetryMillis = 0;
+
+    if ((millis() - lastRetryMillis) < 500)
+        return;
+
+    lastRetryMillis = millis();
+
     switch(gpsData.state) {
         case GPS_INITIALIZING:
         case GPS_CHANGE_BAUD: