Experimental Physics and Industrial Control System
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D. Peter Siddons wrote:
Thanks to all who responded. I should have made it clear that I was
talking about an RTEMS app., which only has
epicsInterruptContextMessage(), which can only print a string, no
formatting. Eric Norum suggested using snprintf() to fill a buffer and
pass that to epicsInterruptContextMessage(). That seems to work fine. I
had the impression before that calling any of the xprintf() commands
from within interrupt context wasn't allowed, but apparently the string
variants are OK.
Pete.
The string variants can't ever block so they're safe to call from an interrupt
handler -- with one small caveat. Interrupt handlers typically do not have
their own floating point context so you've got to ensure that snprintf does
not execute any floating-point instructions.
--
Eric Norum [email protected]
Advanced Photon Source Phone: (630) 252-4793
Argonne National Laboratory
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ANJ, 10 Aug 2010 |
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