LPC2xxx serial driver interrupt priorities

[Uwe Kindler <uwe_kindler at web dot de>]

Hello Andrew,

I saw that you patched the LPC2xxx serial driver interrupt priorities. 
You defined the legal range for interrupt priority from 0 - 15. But the 
LPC2xxx variants support interrupt priorities in the range 0 - 16. The 
priorities 0 - 15 define vectored interrupts and the priority 16 defines 
unvectored interrupts. Have a look at the LPC2xxx CAN driver or the 
LPC2xxx interrupt handling code. I introduced the vectored interrupt 
support.

In my opinion the safest way is to set the priority to 16 because all 
interrupts may use this priority. If you use vectored interrupts then 
there will always be a danger that you use a priority that is already in 
use. So maybe interrupt priority 16 is the safer configuration value 
here. If the user knows its application very well he may raise the 
interrupt priority later.

The newer LPC2xxx variants like LPC24xx do only support vectored 
interrupts. Therefore the LPC24xx serial driver supports interrupts in 
the range from 0 to 15.


Regards and merry christmas,

Dipl. Inf. (FH)
Uwe Kindler
Software Engineering

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