My name is Phuong. Glad to know you.
I’m a RIOT newbie, I’m porting RIOT to ARM Cortex-A9 platform and everything seem to be OK such as context switching, interrupt, initialize and execute threads… However, I’m stuck at xtimer implementation.
The CPU has 32bit timers/counters and it has countdown mode only. When the timer reaches zero it generates timer interrupt request to the CPU. I reference to another platforms porting which are implemented count up timer mode only.
I do not really understand how does xtimer module work, would you please show me how to implement for countdown timer case ?
Thanks and Best Regards, Phuong Dang