From d1d74165f696534dbb3884ab3d52fb952e2ec282 Mon Sep 17 00:00:00 2001
From: Mitch Bradley <wmb@firmworks.com>
Date: Fri, 21 May 2021 13:53:58 -1000
Subject: [PATCH] Check freq != 0 in PWMSpindle to prevent div-by-0 crashes

---
 Grbl_Esp32/src/Spindles/PWMSpindle.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Grbl_Esp32/src/Spindles/PWMSpindle.cpp b/Grbl_Esp32/src/Spindles/PWMSpindle.cpp
index feddd629..3ad3b6ba 100644
--- a/Grbl_Esp32/src/Spindles/PWMSpindle.cpp
+++ b/Grbl_Esp32/src/Spindles/PWMSpindle.cpp
@@ -225,6 +225,9 @@ namespace Spindles {
 	*/
     uint8_t PWM::calc_pwm_precision(uint32_t freq) {
         uint8_t precision = 0;
+        if (freq == 0) {
+            return precision;
+        }
 
         // increase the precision (bits) until it exceeds allow by frequency the max or is 16
         while ((1 << precision) < (uint32_t)(80000000 / freq) && precision <= 16) {