Subject: |
Re: camonitor and caget - displaying unsigned longs in hexadecimal |
From: |
Andrew Johnson <[email protected]> |
To: |
[email protected] |
Date: |
Fri, 4 Dec 2009 17:55:01 -0600 |
Hi Stephanie,
On Friday 04 December 2009 17:16:34 Allison, Stephanie wrote:
>
> I notice that camonitor and caget do not honor the "-0x" option (option
> to printout as hex) for PVs that are unsigned long's. Such PVs are sent
> over CA as double's and -0x is not available for doubles, per design.
> Are there other options that I could use instead? Should I look into
> changing the tools to allow for -0x for unsigned long's?
CA can't transport unsigned types as such, although the IOC database supports
them. If you do a cainfo of one of your ULONG PVs you'll see that its native
type actually gets reported as a DBF_DOUBLE, which is the smallest type that
CA can guarantee will pass any ULONG value correctly. Unfortunately CA gives
no indication of what the real database type is, so I don't think the tool
could properly detect that the field is really a ULONG.
However if you ask caget or camonitor to use DBR_LONG when fetching the value
(add the switch -d LONG) then it does honor the -0x switch, but the display
format is different. Also if your client is a 64 bit machine you might get
the sign bit extended for display. This is the output I get on linux-x86_64
when the top bit is set (note that the DBF_LONG and DBR_LONG types are only 32
bits wide even on 64-bit architectures):
tux% caget -d LONG -0x anjHost:compressExample.N
anjHost:compressExample.N
Native data type: DBF_DOUBLE
Request type: DBR_LONG
Element count: 1
Value: 0xFFFFFFFF80000000
HTH, HANW,
- Andrew
--
The best FOSS code is written to be read by other humans -- Harald Welte
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