Hey everyone. I have one last question regarding the BRAM. For my application I need an address width of 32, but I get the error that the maximum allowable address width is 16. Is there away around this problem or a way to get the BRAM to use an address width of 32?
Thanks for the help! Heystek > On 25 Nov 2021, at 21:28, Dan Werthimer <d...@ssl.berkeley.edu> wrote: > > > hi morag. > > thanks for helping everyone. > > best wishes, > > dan > > > > > On Thu, Nov 25, 2021 at 11:25 AM Morag Brown <mbr...@sarao.ac.za > <mailto:mbr...@sarao.ac.za>> wrote: > Happy to help :) > > On Thu, Nov 25, 2021 at 9:19 PM Heystek Grobler <heystekgrob...@gmail.com > <mailto:heystekgrob...@gmail.com>> wrote: > Hey Morag! > > Know I understand! > > It is working. > > <Screenshot 2021-11-25 at 21.18.00.png> > > Thank you so much for the help!!! > > Heystek > >> On 25 Nov 2021, at 21:08, Morag Brown <mbr...@sarao.ac.za >> <mailto:mbr...@sarao.ac.za>> wrote: >> >> Hi Heystek, >> >> Great! >> >> I think Jack mentioned in an earlier email that the maximum number that can >> be represented by a <32,31> fixed point system is 1 - 2^-31. Reducing the >> magnitude of your sinusoid so that the peak value is below this maximum >> would work. Or alternatively, scaling your values by an amount less than >> 2^31 would have the same effect. >> >> Morag >> >> On Thu, Nov 25, 2021 at 8:59 PM Heystek Grobler <heystekgrob...@gmail.com >> <mailto:heystekgrob...@gmail.com>> wrote: >> Hey Morag >> >> That worked! >> >> When I read the packed sine wave from the BRAM, unpack it and plot it, I get >> this: >> >> <Screenshot 2021-11-25 at 20.56.16.png> >> >> I assume there is one data point that is causing problems at 1 or -1 that is >> overflowing? Any idea how I can fix that? >> >> Heystek >> >>> On 25 Nov 2021, at 20:22, Morag Brown <mbr...@sarao.ac.za >>> <mailto:mbr...@sarao.ac.za>> wrote: >>> >>> Hi Heystek, >>> >>> You would need to increase the BRAM depth to one that can store all your >>> data - currently, because the address width is 10, it can only store 2^10 >>> (1024) points and you're trying to write 6020. So you would need to >>> increase the address width to an appropriate size. >>> >>> Morag >>> >>> On Thu, Nov 25, 2021 at 8:05 PM Heystek Grobler <heystekgrob...@gmail.com >>> <mailto:heystekgrob...@gmail.com>> wrote: >>> Hey Morag >>> >>> The BRAM has an address width 10 and a data width of 32. >>> >>> Should I increase it? >>> >>> Heystek >>> >>>> On 25 Nov 2021, at 19:52, Morag Brown <mbr...@sarao.ac.za >>>> <mailto:mbr...@sarao.ac.za>> wrote: >>>> >>>> Hi Heystek, >>>> >>>> How big is the BRAM in your design? Does it have enough space to >>>> accommodate the amount of data you're trying to write to it? >>>> >>>> Morag >>>> >>>> On Thu, Nov 25, 2021 at 6:59 PM Heystek Grobler <heystekgrob...@gmail.com >>>> <mailto:heystekgrob...@gmail.com>> wrote: >>>> Hey Morag and Jack >>>> >>>> Thank you for the suggestions. >>>> >>>> I played around a little bit. if I create the sine wave the same as you >>>> Morag, then it works. I am able to write it to the bram, read it back from >>>> the bram, unpack it and get the same signal back. As soon as I use the >>>> sine wave that I require for my application, then it breaks again. >>>> >>>> Here is what I achieved using your sine wave Morag (ps iI changed my >>>> design to 32 bit): >>>> >>>> <Screenshot 2021-11-25 at 18.49.04.png> >>>> >>>> >>>> <Screenshot 2021-11-25 at 18.49.34.png> >>>> >>>> <Screenshot 2021-11-25 at 18.49.58.png> >>>> >>>> When I use my sign wave, then it does not work: >>>> >>>> <Screenshot 2021-11-25 at 18.55.45.png> >>>> >>>> <Screenshot 2021-11-25 at 18.56.02.png> >>>> >>>> <Screenshot 2021-11-25 at 18.56.14.png> >>>> >>>> <Screenshot 2021-11-25 at 18.56.43.png> >>>> >>>> The only thing that changed is the sine wave. is there something that I am >>>> missing? >>>> >>>> Thanks for the help! I really appreciate it! >>>> >>>> Heystek >>>> >>>> >>>>> On 25 Nov 2021, at 14:57, Morag Brown <mbr...@sarao.ac.za >>>>> <mailto:mbr...@sarao.ac.za>> wrote: >>>>> >>>>> I think that's because the functions used in both In[15] and In[16] do >>>>> the same thing. See the screenshots below to see what I mean. So you >>>>> construct the raw bytes data in In[15] and then try to pack that as an >>>>> integer in In]16}, which won't work because struct.pack('>i',A_y) expects >>>>> data of type int while you're actually giving it data of type bytes. To >>>>> pack the data using struct.pack() you would need to pass it an int (or >>>>> array of ints and tell it how many points you're packing). I think >>>>> (someone please correct me if I'm wrong) that you only need to do one or >>>>> the other to get the correct raw data to be written to BRAM. >>>>> >>>>> <Screenshot from 2021-11-25 14-55-29.png> >>>>> <Screenshot from 2021-11-25 14-55-39.png> >>>>> >>>>> I also see you're scaling up by 2^31, but I think your BRAM is data width >>>>> is 16 bits, so you'd likely want to scale by 2^15? >>>>> >>>>> Morag >>>>> >>>>> On Thu, Nov 25, 2021 at 12:46 PM Heystek Grobler >>>>> <heystekgrob...@gmail.com <mailto:heystekgrob...@gmail.com>> wrote: >>>>> Hey Jack and Morag >>>>> >>>>> thank you for the advice and help! i am still getting errors and is >>>>> stuck. Below is the new errors: >>>>> >>>>> <Screenshot 2021-11-25 at 12.41.43.png> >>>>> >>>>> <Screenshot 2021-11-25 at 12.42.53.png> >>>>> >>>>> I have also attached the new script I am working on. >>>>> >>>>> Could it be that I am generating the sine wave incorrectly? I have about >>>>> 600 000 000 points that I am working with. >>>>> >>>>> I keep getting “cannot convert argument to integer when running >>>>> struct.pack. >>>>> >>>>> Thanks for the help! >>>>> >>>>> Heystek >>>>> >>>>> >>>>>> On 23 Nov 2021, at 14:31, Jack Hickish <jackhick...@gmail.com >>>>>> <mailto:jackhick...@gmail.com>> wrote: >>>>>> >>>>>> Hi Heystek, >>>>>> >>>>>> Assuming your BRAM is set for 32-bit wide, you probably want to be >>>>>> writing the values with 31 bits below the binary point -- i.e. >>>>>> normalized to the range [-1, 1) (aka simulink FIx32_31). In this case >>>>>> the packed values would be: >>>>>> >>>>>> struct.pack('>i', int(floating_point_sine_value * 2**31)) >>>>>> >>>>>> Though, be careful, because +1.0 isn't included in this number >>>>>> representation (the maximum is 1 - 2**-31) , so you might want to >>>>>> include some saturation logic (or scale up by a value less than 2**31). >>>>>> >>>>>> For what it's worth, you can pack an entire numpy array with: >>>>>> floating_point_numpy_array.astype('>i').tobytes() ,which saves looping >>>>>> and appending to a binary string. >>>>>> >>>>>> Does that help? >>>>>> >>>>>> Cheers >>>>>> Jack >>>>>> >>>>>> On Mon, 22 Nov 2021 at 18:10, Heystek Grobler <heystekgrob...@gmail.com >>>>>> <mailto:heystekgrob...@gmail.com>> wrote: >>>>>> Hey Jack >>>>>> >>>>>> I am also well thank you. We are starting to go back to the observatory >>>>>> (HartRAO) again. >>>>>> >>>>>> Here is a snippets of the python code that I am using as well as my >>>>>> simulink design: >>>>>> >>>>>> The first nipped is where I create the sine wave: >>>>>> >>>>>> The second snipped is where I plot the sine wave: >>>>>> >>>>>> >>>>>> The third snipped is where I pack the sine wave array: >>>>>> >>>>>> >>>>>> The fourth snipped is where I write the packed data to the BRAM: >>>>>> >>>>>> >>>>>> Snipped 5 is where I want to use the sine wave and cosine wave: >>>>>> >>>>>> >>>>>> But to check that it is working, I have created the simple design in >>>>>> snipped 6: >>>>>> >>>>>> >>>>>> I have also attached my simulink design and python script. >>>>>> >>>>>> Thank you for the help! >>>>>> >>>>>> Heystek >>>>>> >>>>>> >>>>>>> On 22 Nov 2021, at 18:55, Jack Hickish <jackhick...@gmail.com >>>>>>> <mailto:jackhick...@gmail.com>> wrote: >>>>>>> >>>>>>> Hi Heystek, >>>>>>> >>>>>>> All good here (in London), Thanks. Hope things are going ok with you >>>>>>> too! >>>>>>> >>>>>>> I've taken this back on list for the benefit of others. Do you have: >>>>>>> >>>>>>> a) a snippet of some python code which you're using at the moment >>>>>>> b) A Simulink snippet of the BRAM you're trying to write to, indicating >>>>>>> how the bram is configured and how its data are being used? >>>>>>> >>>>>>> Cheers >>>>>>> Jack >>>>>>> >>>>>>> On Mon, 22 Nov 2021 at 16:52, Heystek Grobler <heystekgrob...@gmail.com >>>>>>> <mailto:heystekgrob...@gmail.com>> wrote: >>>>>>> Hey Jack >>>>>>> >>>>>>> How are you? It has been a while since we last spoke. >>>>>>> >>>>>>> I am really struggling to pack data into binary format for my design. I >>>>>>> was wondering if you have time if you can please help me with it. I >>>>>>> have no clue if what i am doing is correct and there is no one around >>>>>>> me with the knowledge to help me. >>>>>>> >>>>>>> All that I want to do is too pack a sine wave that I already generated, >>>>>>> and write it to a BRAM. >>>>>>> >>>>>>> I hope to hear from you soon! >>>>>>> >>>>>>> Heystek >>>>>> >>>>> >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google Groups >>>>> "casper@lists.berkeley.edu <mailto:casper@lists.berkeley.edu>" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send an >>>>> email to casper+unsubscr...@lists.berkeley.edu >>>>> <mailto:casper+unsubscr...@lists.berkeley.edu>. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/8791F6EA-204B-4BCC-B0DC-3CAD3D928A05%40gmail.com >>>>> >>>>> 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