Using synchronous AutoDMA‌ Sample Clauses

Using synchronous AutoDMA‌. Synchronous DMA API assumes that the PCI digitizer being controlled has dual-port acquisition memory. As shown below, the user program consumes data synchronously with the acquisition loop. Hence the name Synchronous DMA. A typical sequence of API calls for Synchronous DMA API is shown below. For readability purposes, the following is pseudo-code. Please refer to the sample programs provided for exact syntax and details of what the various parameters passed to these routines mean: // Set up two AutoDMA buffers and start the DMA engine // Data will be captured in the two buffers in a pin-pong // mode. You will be able to process the first buffer while // data is being captured into the second buffer and // vice-versa AlazarStartAutoDMA(h, UserData[0], UseHeader, mode, -(long)bd.PreDepth, transferLength, RecsPerBuffer, bd.RecordCount, &error, CFlags, in1, &r3, &r4); // Issue Start Capture Command. No data transfer happens before this AlazarStartCapture( h ); // Wait until all required records have been captured while (looping == 1) { // Check if one of the AutoDMA buffers has been // fully populated or not AlazarGetNextAutoDMABuffer(h, UserData[0], UserData[1], &WhichOne, &RecsTransferred , &error, in1, in1, &TriggersOccurred, &r4); // If WhichOne is equal to 0 or 1, that particular buffer // has been populated and hardware is DMAing // into the other buffer if ((WhichOne == 0)||(WhichOne == 1)) { // Process Your Data here // Note that while you process data, // new data is still being captured into // on-board dual port memory and transferred into // the other AutoDMA buffer SaveToChannelFiles(UserData[WhichOne]); } // Check if all records have been captured if (RecsTransferred == (long)RecordCount) { // If all records have been captured, stop the while loop looping = 0; } } Note: • The synchronous AutoDMA API is deprecated, and is maintained for compatibility with existing applications. • The synchronous AutoDMA API gives poor performance with master-slave systems, and is not recommended for use with such systems. • Use the CFlags parameter in the call to AlazarStartAutoDMA to select the AutoDMA mode. • Record headers are only available in Traditional AutoDMA mode. To enable record headers, call AlazarStartAutoDMA with the UseHeader parameter set to 1, and with the mode in the CFlags parameter set to ADMA_TRADITIONAL_MODE. • AlazarGetNextAutoDMABuffer copies sample data from internally allocated AutoDMA buffers to an application buffer. An application may ...
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