New HardwareTimer for STM32 5.7.0 (#15655)

Marlin/src/HAL/HAL_STM32/HAL.cpp

@@ -28,6 +28,16 @@
 #include "../../inc/MarlinConfig.h"
 #include "../shared/Delay.h"
 
+#if (__cplusplus == 201703L) && defined(__has_include)
+  #define HAS_SWSERIAL __has_include(<SoftwareSerial.h>)
+#else
+  #define HAS_SWSERIAL HAS_TMC220x
+#endif
+
+#if HAS_SWSERIAL
+  #include "SoftwareSerial.h"
+#endif  
+
 #if ENABLED(SRAM_EEPROM_EMULATION)
   #if STM32F7xx
     #include "stm32f7xx_ll_pwr.h"
@@ -82,6 +92,10 @@ void HAL_init() {
   // Wait until backup regulator is initialized
   while (!LL_PWR_IsActiveFlag_BRR());
   #endif // EEPROM_EMULATED_SRAM
+
+  #if HAS_SWSERIAL
+    SoftwareSerial::setInterruptPriority(SWSERIAL_TIMER_IRQ_PRIO, 0);
+  #endif
 }
 
 void HAL_clear_reset_source() { __HAL_RCC_CLEAR_RESET_FLAGS(); }