Experimental Physics and
Industrial Control System

Hi,

My SIS3820 driver reads out a FIFO using BLT. Here is the code snippet:

      if (useDma_ && (count >= MIN_DMA_TRANSFERS)) {
        asynPrint(pasynUserSelf, ASYN_TRACE_FLOW,
                  "%s:%s: doing DMA transfer, fifoBuffer=%p, fifo_base=%p, count=%d\n",
                  driverName, functionName, fifoBuffer_, fifo_base_, count);
        status = sysDmaFromVme(dmaId_, fifoBuffer_, (int)fifo_base_, VME_AM_EXT_SUP_D64BLT, (count)*sizeof(int), 8);
        if (status) {
          asynPrint(pasynUserSelf, ASYN_TRACE_ERROR,
                    "%s:%s: doing DMA transfer, error calling sysDmaFromVme, status=%d, buff=%p, fifo_base=%p, count=%d\n",
                    driverName, functionName, status, fifoBuffer_, fifo_base_, count);
        }

You can get the complete file containing this snippet here:

https://subversion.xor.aps.anl.gov/synApps/mca/trunk/mcaApp/SISSrc/drvSIS3820.cpp

This code uses the DMA functions that Andrew Johnson provides in the vxWorks BSPs at the APS.

I would like to suggest (again) that these functions or something similar should be added to devLib in EPICS base, so that we can all write portable code that uses DMA!

Cheers,
Mark
________________________________________
From: [email protected] [[email protected]] on behalf of Bai Jiaoni [[email protected]]
Sent: Wednesday, February 15, 2012 7:17 AM
To: [email protected]
Subject: Epics driver using BLT or CBLT to read FIFO wanted

I want to wirte a driver for the hardware, which needs to use record to read the
data of FIFO(altera FPGA) by BLT or CBLT. Do you know some other dirvers finishing
the same function?
Version：Epics 3.13 or 3.14; vxWorks 5.4; VME bus

I am looking forward to your reply.

Replies:

Re: Epics driver using BLT or CBLT to read FIFO wanted Till Straumann

References:

Epics driver using BLT or CBLT to read FIFO wanted Bai Jiaoni

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