Experimental Physics and
Industrial Control System

FWIW. We also have a RTEMS implementation of Andrew's DMA API.
And yes, I'd think integrating this into devLib would be desirable.

Till

On 02/15/2012 08:24 AM, Mark Rivers wrote:
> 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 Mark Rivers

References:

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

RE: Epics driver using BLT or CBLT to read FIFO wanted Mark Rivers

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