From 22a7788fa373e32159a87725b3577ba4e90f7d30 Mon Sep 17 00:00:00 2001
From: jflyper <shinoda@jaist.ac.jp>
Date: Tue, 24 Apr 2018 08:02:32 +0900
Subject: [PATCH] Reset beeper_frequency if valid timer is not found

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

diff --git a/src/main/fc/config.c b/src/main/fc/config.c
index 40e8ab6c95..ba5f655416 100644
--- a/src/main/fc/config.c
+++ b/src/main/fc/config.c
@@ -50,6 +50,7 @@
 #include "io/serial.h"
 
 #include "pg/beeper.h"
+#include "pg/beeper_dev.h"
 #include "pg/pg.h"
 #include "pg/pg_ids.h"
 
@@ -356,6 +357,12 @@ static void validateAndFixConfig(void)
     featureClear(FEATURE_RSSI_ADC);
 #endif
 
+#if defined(USE_BEEPER)
+    if (beeperDevConfig()->frequency && !timerGetByTag(beeperDevConfig()->ioTag, TIM_USE_BEEPER)) {
+        beeperDevConfigMutable()->frequency = 0;
+    }
+#endif
+
 #if defined(TARGET_VALIDATECONFIG)
     targetValidateConfiguration();
 #endif