How to recover from overWriteError from GPCTR_Read_Buffer

[Bran]

I have a ND_BUFFERED_POSITION_MSR application that uses continuous buffering.

The buffer is read periodically with:

GPCTR_Read_Buffer(DeviceNumber, gpctrNum, ND_READ_MARK, 0, 16, 0, mSampleCount, mReadBuffer(1))

Once I get an overWriteError (-10846), I continue to get the error on subsequent calls, with mSampleCount = 0, even when there are no further gate signals.

Is there some way to resume counting and reading the buffer?

[June]

Bran: That -10846 error message is the over write error. The 660x counter device acquires the data and uses either DMA or interrupt to transfer the data from device to computer memory and then that data is being read out the memory buffer using the GPCTR_Read_Buffer function call. If the rate of data being transferred into the computer memory is much faster than the rate of data being read out of the memory, then that overwrite will occur. To eliminate that, you can:
1)increase "mSampleCount", amount to read out at a time
2)increase your buffer size in the GPCTR_Config_Buffer. But if you don't increase the "mSampleCount" and gate frequency is really fast, eventually your buffer will still overflow and give you the -10846. Increasing your buffer size will del
ay this error message.
3)slow down your selected gate frequency (that's probably not an opinion, so I would try first two opinions first)
Hope that helps. Once you get the 10846 error, there is no way to resume counting, since the driver will stop the operation, so the best thing to do is avoid that error message all together.

[Bran]

For some applications, especially for post-triggering, it would be desirable to overwrite old samples and be able to access the most recent samples.