From 1cf766f1b5a31a8702efafd1ddb0ddf7726b3866 Mon Sep 17 00:00:00 2001
From: lilian <lilian@CS-stationdev1.lan>
Date: Mon, 20 Nov 2017 21:36:33 +0100
Subject: [PATCH] fix timer crash, cant divide by 0

---
 core/esp_timer.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/esp_timer.c b/core/esp_timer.c
index 9282e26..2110948 100644
--- a/core/esp_timer.c
+++ b/core/esp_timer.c
@@ -83,6 +83,11 @@ int timer_set_frequency(const timer_frc_t frc, uint32_t freq)
     uint32_t counts = 0;
     timer_clkdiv_t div = timer_freq_to_div(freq);
 
+    if(freq == 0) //can't divide by 0
+    {
+        return -EINVAL;
+    }
+
     counts = timer_freq_to_count(frc, freq, div);
     if(counts == 0)
     {