Using AlazarHyperDisp Sample Clauses

Using AlazarHyperDisp. HyperDisp technology enables the FPGA on an AlazarTech digitizer board to process sample data. The FPGA divides a record in on-board memory into intervals, finds the minimum and maximum sample values during each interval, and transfers an array of minimum and maximum value pairs to host memory. This allows the acquisition of relatively long records to on-board memory, but the transfer of relatively short processed records across the PCI/PCIe bus to host memory. For example, an ATS860-256M would require over 2 seconds per channel to transfer 256,000,000 samples across the PCI bus. However, with HyperDisp enabled the ATS860 would require a fraction of a second to calculate HyperDisp data, and transfer a few kilobytes of processed data across the PCI bus. If an application was searching these records for glitches, it may save a considerable amount of time by searching HyperDisp data for the glitches and, if a glitch were found, transfer the raw sample data from the interval from on-board memory to host memory. Use AlazarHyperDisp to enable a board to process records in on-board memory, and transfer processed records to host memory. The following code fragment enables an ATS860-256M to process a record in on-board memory containing 250,000,000 samples into an array of 100 HyperDisp points, where each point contains the minimum and maximum sample values over an interval of 2,500,000 samples in the record. // Specify number of samples per record U32 preTriggerSamples = 125000000; U32 postTriggerSamples = 125000000; U32 samplesPerRecord = preTriggerSamples + postTriggerSamples; U32 recordsPerCapture = 1; // Acquire to on-board memory (omitted) // Specify the number of HyperDisp points U32 pointsPerRecord = 100; // Allocate a buffer to store the HyperDisp data U32 bytesPerSample = 1; // ATS860 constant U32 samplesPerPoint = 2; // HyperDisp constant U32 bytesPerBuffer = bytesPerSample * samplesPerPoint * pointsPerRecord; U8 *buffer = (U8*) malloc(bytesPerBuffer); // Enable ATS860 FPGA to process the 250M sample record // in on-board memory into an array of 100 HyperDisp points, // and transfer the HyperDisp points into our buffer U32 error; AlazarHyperDisp ( boardHandle, // HANDLE -- board handle NULL, // void* -- reserved samplesPerRecord, // U32 -- BufferSize (U8*) buffer, // U8* -- ViewBuffer bytesPerBuffer, // U32 -- ViewBufferSize pointsPerRecord, // U32 -- NumOfPixels 1, // U32 -- Option (1 = HyperDisp) CHANNEL_A, // U32 -- ChannelSelect 1, // U32 -- record (...