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jhenderson
Site Admin
Joined: 07 Mar 2006
Posts: 2267
Location: So. Cal. USA
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 Posted: Wed Jun 07, 2006 5:49 am Post subject: Detecting integrity errors |
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There are two types of integrity violations in Caliente. The most benign failure mode is tripped whenever the Chico needs to bus master data and all eight BM sub-regions are depleted. This indicates that data loss is forthcoming - so it is more an warning than an error.
These warnings can be detected by installing handlers for these events within the board object.
In MSVC
| Code: | Board.SetEventByName2("OnMyReadIntegrityError", this, &CModulesDlg::OnReadIntegrityError);
Board.SetEventByName2("OnMyWriteIntegrityError", this, &CModulesDlg::OnWriteIntegrityError); |
In Borland
| Code: | Board->OnReadIntegrityError = OnMyReadIntegrityError;
Board->OnWriteIntegrityError = OnMyWriteIntegrityError; |
The other type is a non-recoverable error. This occurs whenever data is overrun or underrun at the module, and only occurs after all buffering within the system, including any on-module FIFO, is depleted. This can only be detected by polling the appropriate module error bit periodically.
Under MSVC, the module can be queried for buffer overflow/underflow using two properties located in the internals structure.
| Code: | bool Overrun = Module.Properties[ "Internals.Overrun" ];
bool Underrun = Module.Properties[ "Internals.Underun" ]; |
Under BCB
| Code: | bool Overrun = Module->Overrun;
bool Underun = Module->Underun; |
I it is convenient to place these checks into the OnBlockDataReady and/or OnBlockDataRequested handlers, since these are called periodically during streaming anyway. Alternately, they can be placed in a timer.
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mikem
Joined: 27 Nov 2007
Posts: 5
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| Posted: Wed Nov 28, 2007 8:28 am Post subject: Resetting overrun error bit |
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Jim,
You said that we the second type of overrun checking was not recoverable. Is there a way to reset the module once that flag is set? I would like to poll the error bit and flag an overrun in my application, but I don't want the user to have to restart the application once it is true. Will restarting my application reset that flag, or is that in the hardware?
Thanks,
Mike
| Quote: | | The other type is a non-recoverable error. This occurs whenever data is overrun or underrun at the module, and only occurs after all buffering within the system, including any on-module FIFO, is depleted. This can only be detected by polling the appropriate module error bit periodically. |
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jhenderson
Site Admin
Joined: 07 Mar 2006
Posts: 2267
Location: So. Cal. USA
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| Posted: Wed Nov 28, 2007 8:51 am Post subject: Integrity error reset |
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The integrity error bit maintained within the module is automatically reset when streaming commences. So, restarting the stream is sufficient - it is not necessary to restart the entire application.
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