в модуле времени добавила функцию получения тиков. в папке variants добавила функции для работы с прерываниями. добавлена рыба библиотеки softserial

cores/arduino/wiring_time.c

@@ -39,6 +39,11 @@ void SysTick_Init(void)
     HAL_SCR1_Timer_Init(&hscr1_timer); // Ticks are 32 MHz
 }
 
+uint64_t SysTick_GetTicks(void)
+{
+  return TICKS_IN_SYSTIMER;
+}
+
 // number of microseconds since start of the program
 uint32_t micros(void)
 {

cores/arduino/wiring_time.h

@@ -30,6 +30,12 @@ extern "C" {
  */
 void SysTick_Init(void);
 
+/**
+ * \brief Returns the number of ticks since the Arduino board began running the current program.
+
+ * \return Number of ticks since the program started
+ */
+uint64_t SysTick_GetTicks(void);
 
 /**
  * \brief Returns the number of milliseconds since the Arduino board began running the current program.