From 580d314fbe72cd398a90bb62f4e33e186761a9e6 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <github@thinkyhead.com>
Date: Sun, 22 Mar 2020 00:19:05 -0500
Subject: [PATCH] Skip impossible PWM sanity-checks

---
 Marlin/src/HAL/STM32F1/HAL.h | 1 +
 Marlin/src/inc/SanityCheck.h | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/Marlin/src/HAL/STM32F1/HAL.h b/Marlin/src/HAL/STM32F1/HAL.h
index c97abf4bb1..f0f0ce1ea6 100644
--- a/Marlin/src/HAL/STM32F1/HAL.h
+++ b/Marlin/src/HAL/STM32F1/HAL.h
@@ -160,6 +160,7 @@ void HAL_idletask();
 
 #ifndef digitalPinHasPWM
   #define digitalPinHasPWM(P) (PIN_MAP[P].timer_device != nullptr)
+  #define NO_COMPILE_TIME_PWM
 #endif
 
 #define CRITICAL_SECTION_START()  uint32_t primask = __get_primask(); (void)__iCliRetVal()
diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index 89b53362d6..f44f93b9af 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -1985,7 +1985,7 @@ static_assert(Y_MAX_LENGTH >= Y_BED_SIZE, "Movement bounds (Y_MIN_POS, Y_MAX_POS
 /**
  * Auto Fan check for PWM pins
  */
-#if HAS_AUTO_FAN && EXTRUDER_AUTO_FAN_SPEED != 255
+#if HAS_AUTO_FAN && EXTRUDER_AUTO_FAN_SPEED != 255 && DISABLED(NO_COMPILE_TIME_PWM)
   #define AF_ERR_SUFF "_AUTO_FAN_PIN is not a PWM pin. Set EXTRUDER_AUTO_FAN_SPEED to 255."
   #if HAS_AUTO_FAN_0
     static_assert(PWM_PIN(E0_AUTO_FAN_PIN), "E0" AF_ERR_SUFF);