How to stop DMA FIFO on FPGA?

Similar Questions

• DMA FIFO of FPGA to host RT is full

  I transfer data via DMA FIFO of FPGA to host RT.

  DMA FIFO is full, I have tried everything I know:

  -increases the size of the FIFO DMA up sideways FPGA

  -set the depth of the FIFO DMA to 100000000

  -increases the amount of DMA FIFO reading in each iteration of the loop

  -use a timed with a frequency of 1 MHz, instead of a normal life all loop

  Please find attached my project folder, FPGA code and code RT.

  I solved my problem.

  Below you will find my FPGA code before solving the problem and after resolution of the problem.

  Solution: I just added a function of 5000 milliseconds (5 seconds) to wait before getting the analog input nodes samples (AI).

  Before:

  

  After:

  

• A Labview program with 4 DMA FIFO on FPGA card that can support DMA only 3

  Hello

  I am a beginner on LabVIEW FPGA, my internship that I work on the previous intern program, there during his internship and he published this program in its report.

  On his program, it's that he put 4 DMA FIFO, but supported the FPGA (PXI of NOR-7951) map where we work me and the trainee takes only 3 DMA, so I can't run the program, I have this error:

  

  I wonder if it's a bug or anything else, any ideas?

  Sorry to answer the longer end, thank you for your response thank you for your help I could change my program, now the program run with three 3 DMA, I used a table to 2 signals in a single FIFO DMA.

  I show the program, that can help someone with the same problem.

• DMA FIFO of FPGA compilation error

  Hello

  I have a cRIO 9074 with FPGA. I tried a simple piece of code to learn how to acquire the data that is generated on the FPGA at a rate of 10 KHz and transfer it to the host VI to treat later in offline mode. However, I meet this compilation error when you compile the FPGA VI base containing a node to write FIFO (photo of the VI attached below). In compiling the report, it is said that there are 256 RAM Block used (the total number is 40), so an error has occurred. The error notification of exact compilation from Xilinx report is reproduced below:

  # From the PAM program

  # o toplevel_gen_map.ncd - intstyle xflow-calendar toplevel_gen.ngd map

  toplevel_gen. FCP

  #----------------------------------------------#

  "Target part using" 3s2000fg456-4 ".

  Design of mapping in the lut...

  Guided running of packaging...

  Running based on the delay of packaging of LUT...

  ERRORack:2310 - type compositions "RAMB16" too found to adapt to this device.

  ERROR: card: 115 - the design is too large to fit the device.  Please consult the Design summary section to see what resource requirements for your design exceeds the resources available in the device. Note that the number of slices don't notice it that their packaging could not be completed accurately.

  NOTE: A file NCD will be always generated to allow you to examine the mapped design.  This file is intended for evaluation use only and will not be processed successfully by means of BY.

  Mapping performed.

  See the report of map file "toplevel_gen_map.mrp" for more details.

  Problem encountered during the packaging phase.

  Summary of design

  --------------

  Error number: 2

  Number of warnings: 125

  ERROR: Xflow - card program returned the error 2 code. Aborting the workflow execution...

  Bitstream not created

  Time history analysis

  What does that mean? How can I fix this error?

  Thank you

  Bogdan

  Hey,.

  Have you already tried to reduce the size of the FIFO memory?

  Christian

• Transfer 1 d table using DMA FIFO of FPGA

  I'm transferring a table 1 d of two U32, with a configured U32 FIFO for the host.

  but I get the error because of the connection to different types of terminals,

  It seems very simple, I found a lot of samples with a very similar treatment here, but I don't see the problem?

  

  There is a loop of indexation of array... The write operation is therefore the element by element.

  The operation of reading (on the host) can read several items at once (--> a table).

• simple DMA FIFO reading two analog channels

  Hello

  I have a question on a method of data transfer between two analog inputs for a simple DMA FIFO in FPGA. The code is described here: http://decibel.ni.com/content/docs/DOC-6303. If I use this method, and I got out in a graph of my host VI, the calendar in the graph reflects the same schedule as the signals that have been entered? Or will they be phase shift between two signals?

  Thank you

  Grant

  Grant:

  Because it is not all information of timing with the signals in the FIFO, there will be no lag phase on the chart.

  Hope that helps. I would like to know if I forgot something, or who does not explain very well.

  Thank you!

• For a DMA FIFO running from the host to the 7976 is a data type that is optimum for PEP?

  For transmission to the host 7976, I can pack my data in say U64s or break up in U8s.  Y at - it a data type that will give the best rate?  Maybe based on the bus (SMU) or the implementation of RIO drivers behind the scenes?

  My experience is different.  Once, I did a load of tests with different widths DMA FIFO for FPGA and tested the throughput and latency.  If sending data via U8, U16 or U32 DMAs, I saw the same total transfer of bps.  My explanation for this?  Given that the width of the DMA is 32 - bit, LV little packaging in order to ensure that each part of the 32 bits is used.  This means that if you have a DMA U8, it will transfer at a time, 4 to DMA 2 both U16 or U32 DMA one at a time.  64-bit is divided into two individual transfers.

  Do not use FXP.  Even a 1-bit FXP is represented internally as 64-bit and will require TWO DMA transfers to an FPGA.

  Side fromt hat, U8, U16 or U32 makes essentially no difference because they are all packed 32-bit internally.

• How to choose the maximum number of items for DMA FIFO to the R series FPGA

  Greetings!

  I'm working on a project with card PCIe-7842R-R series FPGA of NOR. I use to achieve the fast data transfer target-to-host DMA FIFO. And to minimize overhead costs, I would make the size of the FIFO as large as possible. According to the manual, 7842R a 1728 KB (216KO) integrated block of RAM, 108 000 I16 FIFOs items available in theory (1 728 000 / 16). However the FPGA had compilation error when I asked this amount of items. I checked the manual and searched online but could not find the reason. Can someone please explain? And in general, what is the maximum size of the FIFO given the size of the block of RAM?

  Thank you!

  Hey iron_curtain,

  You are right that the movement of large blocks of data can lead to a more efficient use of the bus, but it certainly isn't the most important factor here. Assuming of course that the FIFO on the FPGA is large enough to avoid overflowing, I expect the dominant factor to the size of reading on the host. In general, larger and reads as follows on the host drive to improve throughput, up to the speed of the bus. This is because as FIFO. Read is a relatively expensive operation software, so it is advantageous to fewer calls for the same amount of data.

  Note that your call to the FIFO. Read the largest host buffer should be. Depending on your application, you may be several times larger than the size of reading. You can set the size of the buffer with the FIFO. Configure the node.

  http://zone.NI.com/reference/en-XX/help/371599H-01/lvfpgaconcepts/fpga_dma_how_it_works/ explains the different buffers involved. It is important to note that the DMA engine moves data asynchronously read/write on the host nodes and FPGAs.

  Let me know if you have any questions about all of this.

  Sebastian

• Transmission of data to the host of RT to the FPGA via DMA FIFO

  Hello

  I try to write data from a host of RT on target FPGA using DMA FIFO and then process these data and read then return of the FPGA target to the host of the CR through an another DMA FIFO. I'm working on the NI SMU chassis 1062 q, with the built-in NI SMU-8130 RT controller and target FPGA NI SMU-7965R.

  The problem I face is that I want to send three different tables, two of the same size and the third with different size, and I need one more small to be sent first to the FPGA. I tried to use encode dish with two executives in the FPGA VI. In the first image, I read and write the first table in a while loop which is finite (that is, a finite number of iterations). The second frame contains the process of reading and writing the second two tables (of the same size) in a while loop that can be finite or infinite (depending on a control). The problem is that it does not work. 2 arrays are displayed on the front panel of the RT VI host and works well, however, the table that should have been read in the first sequence does not appear on the front panel of the RT VI host. It is not sensible because if it is not passed from the host to the fpga and vice versa then the second image should not have been executed. Note that I'm wiring (-1) for the time-out period to block the while loop iterations until the passage of each item is completed. So the first while loop has only 3 iterations. Could someone help me undersdtand why this happens and how to fix this?

  I enclose a picture of the host and the fpga vi.

  Thank you.

  If you vote for my idea here and it is implemented, you can even omit the loop FOR fully.

  (I also propose the RE / IM divided inside the loop FOR and perform operations on complex table before the loop the transpose and reshape .) In this way, you only need one instance of these operations. You might even save some unnecessary allocations table in this way)

• How is managed using DMA FIFO (target host) host matrix

  Hi people,

  I'm trying to pass an array of values of the host to the FPGA using DMA FIFO. Let's say 20000 items in the table. My FIFO host side can contain only 16000 items or almost. The data will be written element by element regardless of the size of the table or do I need to partition the table in small paintings before writing the FIFO method? Let's say that I write for the FIFO with berries small, 1000-element. The FIFO will read 1 element both of the side FPGA so the stream is blocked until I have at least 1000 free items on the FIFO method write, how he writes every 1000 the next setpoint at the same time? Or target values will be written permanently as soon as the individual elements are erased by the number of available items to write?

  Hi Nathan,

  Sorry for the late update, but I just thought that I should follow. I followed your advice and try it tested just for me (I probably should I have done it before posting). Turns out that the data table will write even if there is not enough empty elements to contain the table in its entirety. However, it always crashes until enough information is read and erased from memory on the side FPGA for the whole table. So if it's data that are constantly being played, it's always better transmitting data through in the form of smaller tables if you do not want to increase the amount of memory FIFO host OCCUPIES on your system. However, if you can afford the memory while you mentioned, you can always increase the depth of the FIFO on the host side. As I understand it, try to write more big berries to a host to target FIFO buffer does not diminish overhead costs (as is the case with a target to host FIFO) as it still passes an element at a time to the FIFO of FPGA-side without worrying.

  Thanks again for your help.

  Kind regards

  John has

• Number of DMA FIFO of items to read mismatch in the FPGA and RT

  Hi all

  I use myRIO, LV14 to run my application.

  Request: I have to continuously acquire data via FPGA and host RT process once every 2000 samples are taken. I use DMA FIFO (size 8191) to acquire data, use timeout property in the FPGA to eliminate the buffer overflow. I had followed cRIOdevguide to implement this part. An excerpt of what I put in place is attached. All code runs in the SCTL at 50 MHz.

  Question: Two or three times I met with this strange behavior, the FPGA FIFO gives continous timeout and the RT is unable to read the FIFO. The number of elements to set the property in the FPGA VI gives 0 showing that FIFO is full and no more can be written, but the RT, remaining items gives 0, so it is reading 0 (none) elements.

  Solution: I put a case where I'll write to FIFO (under the code) and if the number of elements to write is different from zero. It seems to work fine, from now.

  What confuses me, is that my FPGA VI said that FIFO is full (number of items to write 0 = FIFO) and gives a timeout error, but RT VI said that number of items remaining in the FIFO is 0 and therefore no data is read. No idea why this is so? My RT and FPGA VIs continues to run, but with no gains or to read data.

  A few minutes after you run the code, I've seen this behavior. No idea why this happens? I try to reproduce the behavior, and will update if I meet with her again. Sorry, I can't post my code here, but I guess the code snippets to explain some extend.

  Thank you

  Arya

  Edit: Even with the mentioned workaround solution, the problem persists, now that the FPGA written any of FIFO. And the RT VI is not able to read all the elements he sees 0 items in the FIFO. The FIFO continues to be in a State of timeout. So I guess that the problem is on the side of RT.

  Why it looks like you read from the FIFO even in two different places in the same VI, at the same time? If the lower reading throws the FIFO, it will never trigger the reset, which could lead to the situation you describe, I think (it's hard to tell from a few screenshots).

  Also, your logic seems too complicated. I immediately noticed that there is no reason to select the entry, the output of = 0 - simply use the 'equal to zero' output directly. On the side of FPGA, why you need check the number of items that you want to write? There's nothing wrong with writing in a FIFO that is already full. just the data won't get written.

• [FPGA] Request DMA FIFO

  I want to transfer data to my FPGA using a DMA FIFO. The FIFO is 1024 elements, but can I write bigger than that of the side pieces PC? I don't know if the PC actually allocates a larger block of memory for this purpose?

  I'm sure that you can set DMA on the side host is greater.  There is a node of configuration DMA you can use host-side to define the size of the FIFO on the side host.  The size is set in the hardware on the target side.

• How to add a FIFO 128-bit DRAM to the FPGA project?

  How can I add the DRAM FIFO - 128-bit memory Interface to an SMU-796XR RIO module?

  

  Above project is examples of projects. I know how to add DRAM but not how to set as FIFO 128 bits as shown above.

  Any guidance is appreciated.

  Right-click on the FPGA target-> properties

  Select Properties DRAM on the left side of the Popup.

  Change the mode of the two shores to CLIP nested LabVIEW FPGA memories.

  Click OK.

  The project will be auto-updated with new DRAM memory, it will be empty.

  Right-click on the DRAM-> properties

  Enable

  Select FIFO 128 bits

• How can I send more than one signal to DMA FIFO?

  Hello

  I am trying to send more than one signal to DMA FIFO, but I don't know how to do. I have no problems when I send a signal. I try to use a DMA FIFO block for a single signal. For example if I have 3 signal I use · FIFO of DMA but when I want to wath them a table waveform signals have a delay.

  How can I do to send more than one signal to DMA FIFO? and if this is not possible, how do I do to syncronizate 3 signals?

  The data type of the signal is FXP<16,10>

  Kind regards.

  Pablo

  
  

• Release NiFPGA 7842 DMA FIFO after reading memory

  Hello

  I use the card RIO de Ni7842. I've implemented a block for the acquisition of data on my FPGA (target device) and filling a FIFO to transfer the data from the target to the host machine. I've implemented the FIFO to a size of 10 k. The number of samples that I'm gaining is 16 K on three channels simultaneously.

  I read the data from the FIFO DMA implemented on a host machine with the support of the C API for the Council. I have setup the FIFO for read in three steps by launching calls to methods:

  -ConfigureFIFO - configure FIFO depth

  -FIFO reading - read items in a host DMA - it runs in a loop playback of 1 k datapoints at each iteration (the data type I16's not 2kb which is playing)

  -Stop the FIFO

  What is the memory allocated on the host DMA by calling method configureFIFO need to be released explicitly by calling ReleaseFIFO? Note that AcquireFIFO is not called here.

  Please advice.

  Thank you!

  In my view, all memory is allocated out during the call to NiFpga_Finalize, but I was not able to find a specific documentation to confirm that.

  There is a specific example of FIFO included with the C API of FPGA that my be of interest to you if you have already looked at him.