Experimental Physics and
Industrial Control System

Till Straumann <[email protected]> · Thu, 12 May 2011 19:54:39 -0500

On 05/12/2011 07:07 PM, Ernest L. Williams Jr. wrote:

Till Straumann wrote:

On 05/12/2011 05:22 PM, Zelazny, Michael Stanley wrote:

If, for example, dbLoadRecords, initializing some hardware module,
cd("some/dir"), etc. fails while an IOC is booting, is there any way
to trap this in my st.cmd and take an action, such as abort the IOC
boot?

Under RTEMS (cexpsh shell -- every line is a C expression)
you can easily do that (provided that the routine you want to trap
returns a status)

dbLoadRecords(...) && bsp_reset()

will reset the board if dbLoadRecords() returns
a non-zero value.

However, rebooting is maybe not the best way to
handle this since you will most likely end up in
an endless loop (since the error condition doesn't
go away with a reboot).

What we really want is for the whole process to just stop.
For example, in RTEMS if there is an undefined symbol the system errors
out and stops.

On beatnik (and some other BSPs) you can do

dbLoadRecords() && BSP_panic("dbLoadRecords failed")

This will print a message to the console and wait
for the user to press a key and only then proceed to
reset the board.

HTH
-- Till

Or is that vxWorks, I am thinking of?

-- Ernest

HTH
-- Till

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System