Interupt priorities

[philipgillespie]

Posted on June 28, 2011 at 09:38

Hi All,

Can anyone explain the difference between the prem and sub interupt priorities.  For example what TIMER_1_IRQ_PREM_PRI and TIMER_1_IRQ_SUB_PRI. -- Thanks #stm32-c-embedded

[ColdWeather]

Posted on June 28, 2011 at 12:19

Pre-emptive: an interrupt source having higher pre-emptive priority would interrupt the service routine being processing a previously occured interrupt with a lower pre-priority. The higher interrupt having been processed, the CPU returns to the interrupted service routine of the lower priority.

Sub: should two or more interrupts having the same pre-emptive priority occure simultaneously (or be pending), an interrupt with the higher sub-priority would be serviced first, and they cannot interrupt each other. Remember: the lower the value of the priority, the higher it is; the highest (user) priority is '0', the lowest - '15'.

[mehmet.karakaya]

Posted on June 28, 2011 at 21:37

https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/TIM2 encoder mode - please help !&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=554

if the link fails to open search for mehmet karakaya and click on the link for this title

TIM2 encoder mode - please help

and look clive's answer

[jzarnow2]

Posted on June 29, 2011 at 16:58

@@  ColdWeather & Mehmet

Guys,

Would you pls use ''Enter'' key on your keyboards more often?

Reading such looooooong text lines is really annoying...

Regards

Jacek

[ColdWeather]

Posted on June 29, 2011 at 22:23

Hi, Jacek!

Got 50'' PC monitor? Make your window narrower ;).