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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 

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Found 7 results

  1. Submitted by Alix on Fri, 04/23/2010 - 21:44 Hi, I want to read an optical fork mounted on a drive shaft with VisSim, and I want to estimate speed and position of the drive shaft. Using eCAP I can have access to the time between two rising edges of the fork signal, which gives me the speed (I use VisSim F280X eCAP module, which works well). Having access to the eCAP register would allow me to directly estimate the position (angle). Is it possible to have access to the eCAP register with VisSim, and how ? I put some details in the attached drawing, to explain what eCAP register means for me. Thanks,
  2. Submitted by Goran Vidakovic on Fri, 04/08/2011 - 03:54 Hi, I'm working on a TI renewable energy kit with a F2808 control card. How can I modify the existing project of a three phase inverter to get the single phase inverter? Is it enough to delete the other two phases? (but then it will be a half-bridge, in theory there are 2 pairs of switches for a single phase and 3 pairs of switches for a three phase inverter). Also I would like to implement phase shifting and changing the amplitude of the AC output voltage considering the grid AC voltage (for a power flow purpose between the kit and the grid). Could I do it by changing the amplitude and phase of the sin waveform before the generation of the PWMs for the inverter? I'm a beginner in VisSim and I would be grateful for any help. Best regards, Goran
  3. Submitted by Joe on Fri, 10/23/2009 - 21:05 There are 2 inputs to the VisSim ePWM block and when you right click there are many many options. Are there any other blocks or items that go with or belong with the epwm module or is everything self contained. I'm trying to sync a few modules and play with timing. I downloaded the 100+ pages of TI epwm reference (SPRU791F) so this will keep me busy. Any recommendations or tips regarding this module? Thanks
  4. dc buck converter won't work. Help!

    Submitted by Joe on Sat, 10/31/2009 - 00:59 I'm using your dc-2buck-f2808-d diagram as a starting point to control my buck converter. I've taken the output voltage and wired it to ADCINB0 through a 1K resistor (I know it should be buffered but I want to do a quick test). I'm assuming that c0: is the reference? So if I set that to .5 my reference would be full scale input/2? 1.5V? But when I move the slider to a non zero value, the regulator goes from 0V to full on. What am I doing wrong?
  5. Submitted by Joe on Thu, 03/04/2010 - 21:13 I have a diagram with > 12000 blocks and the memory usage is about 34k of program (in flash),8k of data. The stack requirement is very low (< 128) but the problem is the heap. This diagram is asking for 2834 of heap ! I'm affraid I will need more as well. The most that I can fit into the 280x is 1856. How can I increase the heap memory allocation in the DSP ? What are ways in which I can manipulate my diagram to minimize the heap usage ? best regards
  6. Submitted by Alix on Tue, 05/11/2010 - 19:37 we still have many troubles trying to load program in the flash memory of our DSP boards. It often does not work, but sometimes (less than 1% of the times) worked... Even a very simple program generally does not load into flash. We asked a couple of months ago for your help, and thanks to the informations you gave us it worked at that time. It sometimes worked since, but it is simply random : it sometimes works, very often does not work, and we don't know why. I just do not understand at the moment. I have been trying all the afternoon to load a very simple VisSim program into the flash memory (the same I sent you a couple of months ago), and it didn't work. The program successfully runs on the DSP RAM memory. Each time, CCS seems to successfully load the program into flash (it answers Erase/Program/verify operation succeeded). After having loaded program into Flash with CCS, we power off the board, and then turn it on again. We expect the DSP to automatically launch the program loaded into flash, but it does not work (or rather rarely works). I have attached you the Vissim file we use, the DSP files generated (.c and .out), and the configuration we use to generate code and to load the program into flash. I am trying to understand why flashing rarely works, what we are doing wrong. Do you have any idea ? Thank you for your help, Regards, Alix
  7. Submitted by Joe on Fri, 08/27/2010 - 19:21 I have had good success using VisSim with F2801 and F28027 but I want to design an ultimate motor control board for code development purposes. I like the TI320F28335 (the 150Mhz, 520KB Flash) DSP. Do you have any experience with this DSP? Is this the top of the line DSP that I can rely on? Will it work with VisSim? How easy it is to transfer 28335 code to a 2806 code? Does VisSim handle things differently for 28335? If you think 28335 is not a good choice from VisSim perspective than let me know which one is? My idea is to not worry about memory or speed of the uP during algorithm development and transfer codes to suitable 280x or even piccolo series after I get a feeling on how much speed and memory I need.