RIOT Timer tests

• difference xtimer, periph_timer, RTT, RTC?
  • xtimer high level, take one low level timer (periph_timer?)
  • periph_timer low level hardware time
  • RTT, RTC??
• benchmark timer exists, why change to RobotFramework (RF) tests?
  • good report generation
  • integration with CI
• benchmark behaviour in benchmark timer test implemented in RF tests? e.g. avoid phase lock, estimate benchmark cpu overhead
  • ja but later. not that important for now

what to do

• look how others tests timers (linux, freertos, contiki, zephyr)
• identify and classify problems of timer from issue list
• design tests for identified problems and implement
  • specify how to improve accuracy of tests (avoid phase lock, estimate test overhead, etc.)
• find use cases (in RIOT)
  • sensitivity (us, ns, s)
  • which component use? how used?
    • z.b. concurrency

more q

• what are still open/needs to be done?
• literatur vorschlag?

timer problems

• drift #10523
• miscaling with long sleep time #9049
• hang for small sleep time #7347
• high frequency #11523
• interrupt safe #8388 #5338
• XTIMER_OVERHEAD #9491