How do I get a report of which sequence is currently running on a sequencer?
This is for debugging only ... I can already see I have a problem. What I want is a bit more debugging info. There are multiple sequences that can run and I want to know which is queued up to. I'd settle for getting the information (sequence by name) from the driver after get_next_item unblocks, but I don't see how to do that either.
Thanks in advance.
If you have a handle to the sequencer, then you can use the methods provided in uvm_sequencer_base class to get the current sequence executing.
uvm_sequencer m_seqr; // This is your sequencer pointer
if (m_seqr.is_grabbed()) begin
uvm_sequence cur_seq = m_seqr.current_grabber();
`uvm_info(get_name(), $psprintf("Current sequence executing is %s", cur_seq.get_name(), UVM_MEDIUM)
end
Related
I am a newbie in CANOPEN. I wrote a program that read actual position via PDO1 (default is statusword + actual position).
void canopen_init() {
// code1 setup PDO mapping
nmtPreOperation();
disablePDO(PDO_TX1_CONFIG_COMM);
setTransmissionTypePDO(PDO_TX1_CONFIG_COMM, 1);
setInhibitTimePDO(PDO_TX1_CONFIG_COMM, 0);
setEventTimePDO(PDO_TX1_CONFIG_COMM, 0);
enablePDO(PDO_TX1_CONFIG_COMM);
setCyclePeriod(1000);
setSyncWindow(100);
//code 2: enable OPeration
readyToSwitchOn();
switchOn();
enableOperation();
motionStart();
// code 3
nmtActiveNode();
}
int main (void) {
canopen_init();
while {
delay_ms(1);
send_sync();
}
}
If I remove "code 2" (the servo is in Switch_on_disable status), i can read position each time sync send. But if i use "code 2", the driver has error "sync frame timeout". I dont know driver has problem or my code has problem. Does my code has problem? thank you!
I don't know what protocol stack this is or how it works, but these:
setCyclePeriod(1000);
setSyncWindow(100);
likely correspond to these OD entries :
Object 1006h: Communication cycle period (CiA 301 7.5.2.6)
Object 1007h: Synchronous window length (CiA 301 7.5.2.7)
They set the SYNC interval and time window for synchronous PDOs respectively. The latter is described by the standard as:
If the synchronous window length expires all synchronous TPDOs may be discarded and an EMCY message may be transmitted; all synchronous RPDOs may be discarded until the next SYNC message is received. Synchronous RPDO processing is resumed with the next SYNC message.
Now if you set this sync time window to 100us but have a sloppy busy-wait delay delay_ms(1), then that doesn't add up. If you write zero to Object 1007h, you disable the sync window feature. I suppose setSyncWindow(0); might do that. You can try to do that to see if that's the issue. If so, you have to drop your busy-wait in favour for proper hardware timers, one for the SYNC period and one for PDO timeout (if you must use that feature).
Problem fixed. Due to much EMI from servo, that make my controller didn't work properly. After isolating, it worked very well :)!
I am trying to implement a UVM Driver for a simple pipelined model using semaphores, fork-join & get()-put() methods in the run_phase of the driver.
The driver part is doing the job fine if only I code the sequence in a particular way. From what I know the body task is coded as below
Code1:
pkt = packet::type_id::create("pkt"); // Factory create the sequence item
for(int i=0;i<num_trans;i++) // Repeat as required
begin
assert(pkt.randomize()); // Randomize the sequence item
start_item(pkt); //Send the request to Driver.
finish_item(pkt); //Wait for the driver to finish the current item
Above style, there's no pipelining achieved and moreover the data beat corresponding to the first transaction packet is lost. When the randomization is invoked after start_item, the test bench works as expected.
Code2:
pkt = packet::type_id::create("pkt");
for(int i=0;i<num_trans;i++)
begin
start_item(pkt);
assert(pkt.randomize());
finish_item(pkt);
I'd like to know what is the difference between coding style 1 and 2
This might be happening because on the task start_item() task we are waiting for the following.
sequencer.wait_for_grant(this, set_priority);
so we are waiting for the sequencer to grant the sequence and then sequence_item will be taken, but if you do like the following.
assert(pkt.randomize()); // Randomize the sequence item
start_item(pkt); //Send the request to Driver.
that randomization lost because that start_item might be waiting for the sequencer to be free and till that time we lost the randomization.
further you can read the following article, that might help https://verificationacademy.com/forums/uvm/startitem/finishitem-versus-uvmdo-macros
When I attempt to run the line:
MyDBContext.Database.Log = Console.Write
The compiler smiles and tells me I don't know what I am doing...
The app won't compile because of the line and the error on that line is:
Overload resolution failed because no accessible Write accepts this number of arguments.
That makes sense. 'Console.Write' returns nothing and I am setting it equal to a System.Action(Of String)
This just seems kind of half baked.
I tried numerous ways to fix it including delegates, and some of the other 'new possibilities' moving this off the Context is supposed to offer but still no dice.
What am I missing? Is it something that was changed at the last minute?
I have two large edmx files (one connects to SQL Server and the other to Oracle) in the solution and all of that is working great.
Here are my version numbers if that can help.
EntityFramework 6.0.0.0 (folder is ...\EntityFramework.6.1.3\lib\net45\EntityFramework.dll)
EntityFramework.SqlServer 6.0.0.0 (folder is ...\EntityFramework.6.1.3\lib\net45\EntityFramework.dll)
Oracle.ManagedDataAccess.EntityFramework 6.121.2.0
I have a tool I created that lets me paste the output of the L2S 'mycontext.log' into it and it then parses it and creates SSMS ready SQL with variables... it has been incredibly useful. This has been one of my favorite features of L2S.
Please help me understand why this isn't working.
Thanks in advance.
This technique works for me:
public override int SaveChanges()
{
SetIStateInfo();
#if DEBUG
Database.Log = s => Debug.WriteLine(s);
#endif
return base.SaveChanges();
}
http://blogs.msdn.com/b/mpeder/archive/2014/06/16/how-to-see-the-actual-sql-query-generated-by-entity-framework.aspx
Well, the answer was to research the Action(T) Delegate which showed me how to do it.
#If DEBUG Then
myctx.Database.Log = AddressOf Console.Write
#End If
Just needed the AddressOf and I was back in business.
I'm building a client using dns-sd api from Bonjour. I notice that there is a flag called kDNSServiceFlagsShareConnection that it is used to share the connection of one DNSServiceRef.
Apple site says
For efficiency, clients that perform many concurrent operations may want to use a single Unix Domain Socket connection with the background daemon, instead of having a separate connection for each independent operation. To use this mode, clients first call DNSServiceCreateConnection(&MainRef) to initialize the main DNSServiceRef. For each subsequent operation that is to share that same connection, the client copies the MainRef, and then passes the address of that copy, setting the ShareConnection flag to tell the library that this DNSServiceRef is not a typical uninitialized DNSServiceRef; it's a copy of an existing DNSServiceRef whose connection information should be reused.
There is even an example that shows how to use the flag. The problem i'm having is when I run the program it stays like waiting for something whenever I call a function with the flag. Here is the code:
DNSServiceErrorType error;
DNSServiceRef MainRef, BrowseRef;
error = DNSServiceCreateConnection(&MainRef);
BrowseRef = MainRef;
//I'm omitting when I check for errors
error = DNSServiceBrowse(&MainRef, kDNSServiceFlagsShareConnection, 0, "_http._tcp", "local", browse_reply, NULL);
// After this call the program stays waiting for I don't know what
//I'm omitting when I check for errors
error = DNSServiceBrowse(&BrowseRef, kDNSServiceFlagsShareConnection, 0, "_http._tcp", "local", browse_reply, NULL);
//I'm omitting when i check for errors
DNSServiceRefDeallocate(BrowseRef); // Terminate the browse operation
DNSServiceRefDeallocate(MainRef); // Terminate the shared connection
Any ideas? thoughts? suggestion?
Since there are conflicting answers, I dug up the source - annotations by me.
// If sharing...
if (flags & kDNSServiceFlagsShareConnection)
{
// There must be something to share (can't use this on the first call)
if (!*ref)
{
return kDNSServiceErr_BadParam;
}
// Ref must look valid (specifically, ref->fd)
if (!DNSServiceRefValid(*ref) ||
// Most operations cannot be shared.
((*ref)->op != connection_request &&
(*ref)->op != connection_delegate_request) ||
// When sharing, pass the ref from the original call.
(*ref)->primary)
{
return kDNSServiceErr_BadReference;
}
The primary fiels is explained elsewhere:
// When using kDNSServiceFlagsShareConnection, there is one primary _DNSServiceOp_t, and zero or more subordinates
// For the primary, the 'next' field points to the first subordinate, and its 'next' field points to the next, and so on.
// For the primary, the 'primary' field is NULL; for subordinates the 'primary' field points back to the associated primary
The problem with the question is that DNSServiceBrowse maps to ref->op==browse_request which causes a kDNSServiceErr_BadReference.
It looks like kDNSServiceFlagsShareConnection is half-implemented, because I've also seen cases in which it works - this source was found by tracing back when it didn't work.
Service referenses for browsing and resolving may unfortunately not be shared. See the comments in the Bonjour documentation for the kDNSServiceFlagsShareConnection-flag. Since you only browse twice I would just let them have separate service-refs instead.
So both DNSServiceBrowse() and DNSServiceResolve() require an unallocated service-ref as first parameter.
I can't explain why your program chokes though. The first DNSServiceBrowse() call in your example should return immediately with an error code.
Although an old question, but it should help people looking around for answers now.
The answer by vidtige is incorrect, the may be shared for any operation, provided you pass the 'kDNSServiceFlagsShareConnection' flag along with the arguments. Sample below -
m_dnsrefsearch = m_dnsservice;
DNSServiceErrorType mdnserr = DNSServiceBrowse(&m_dnsrefsearch,kDNSServiceFlagsShareConnection,0,
"_workstation._tcp",NULL,
DNSServiceBrowseReplyCallback,NULL);
Reference - http://osxr.org/android/source/external/mdnsresponder/mDNSShared/dns_sd.h#0267
I'm using a C program with sqlite3.
Some times insert works.But sometime ,its not working.
assert(retval == SQLITE3_OK)
gives error. while debugging I found retval value of sqlite3_step() is error code = 5
which refers to Database file is busy
Even closing with sqlite3_close() return error code 5.
Any thoughts on how to close the database connection ,even when it's busy?
You could be in the middle of a transaction. Try checking http://www.sqlite.org/c3ref/get_autocommit.html for explanations on how sqlite3_get_autocommit() works. It should return a zero if it is not in auto-commit, meaning there is an open transaction.
Or if you suspect your database might still be working on something, you can use sqlite3_busy_timeout() to set a timer. http://www.sqlite.org/c3ref/busy_timeout.html