| Mynewt FAQ: Porting Mynewt |
| ========================== |
| |
| .. contents:: |
| :local: |
| :depth: 1 |
| |
| Porting Mynewt to Core-M3 MCU |
| ----------------------------- |
| |
| **Q**: I have a weird OS tick issue with a Core-M3 MCU port. The tick rate is set up identically to most ARM MCUs by |
| setting up a hardware interrupt to trigger SysClock / ``os_tick_per_sec``. SysClock is correct and ``os_tick_per_sec`` |
| is set to 1000, but the tick rate seems to be significantly higher. What am I doing wrong? |
| |
| **A**: Check whether the LED is actually staying on or it is flickering really fast by debugging through the loop. If |
| it is staying on, you may be getting into an ``assert()``. Otherwise, it is due to the fact that the OS timer wasn’t |
| created, which is done by ``hal_bsp.c``. The OS timer needs a hardware timer to be running, so you will need to call |
| ``hal_timer_init`` for timer 0 at one point. |
