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ePWM
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  • Forum Post: Re: help! TMS320F28335: question about the ePWM configuration for three phase full bridge IGBTs drive

    Tim Love
    Yqmeng, There are two different modes to update the CMPA and CMPB registers. They can be updated in Shadow Mode or Immediate Mode. Both of these modes are detailed on page 35 of the TMS320x2833x, 2823x, EPWM Module Reference Guide: http://focus.ti.com/lit/ug/sprug04/sprug04.pdf The TBCTR also has...
    on Dec 12, 2008

  • Forum Post: Re: help! TMS320F28335: question about the ePWM configuration for three phase full bridge IGBTs drive

    yqmeng
    Hi Tim It seems that I have found a bug about the ePWM module of the F28335 DSP, I am not sure if it is really a bug, could you please help me solve this problem? the problem is: the test program is the example code epwm_updown_aq in DSP2833x_v120 from the C/C++ Header Files and Peripheral Examples...
    on Dec 16, 2008

  • Forum Post: Re: help! TMS320F28335: question about the ePWM configuration for three phase full bridge IGBTs drive

    Tim Love
    yqmeng, You are using two different times and they give seperate counts. It is possible that you have one configured with a prescaler and is not running at the same frequency. Can you check this? Regards, Tim Love
    on Dec 17, 2008

  • Forum Post: ePWM modules counting question

    yqmeng
    Hi all It seems that I have found a bug about the ePWM module of the F28335 DSP, I am not sure if it is really a bug, could anyone please help me solve this problem? the problem is: the test program is the example code epwm_updown_aq in DSP2833x_v120 from the C/C++ Header Files and Peripheral Examples...
    on Dec 17, 2008

  • Forum Post: Re: help! TMS320F28335: question about the ePWM configuration for three phase full bridge IGBTs drive

    yqmeng
    Hi Tim the test program used by us is the example code epwm_updown_aq in DSP2833x_v120 from the C/C++ Header Files and Peripheral Examples sprc530, the prescalers of the TIMER0 and TBCLK has been configured and is running at the same frequency 150MHz, EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock...
    on Dec 18, 2008

  • Forum Post: F2808 ePWM Sync Issue

    Tim Love
    Champs, A customer of mine is experiencing an issue with the Sync functionality of the ePWM in his specific setup (externally synchronized interleaved buck): The problem is that the external synchronization signal does not have exactly the same frequency, may be there are a couples of Hz of difference...
    on Feb 10, 2009

  • Forum Post: Unresolved symbols with SFO lib, is some math library missing?

    Magnus Aman
    Hi, I am trying to help a customer to start using the HRPWM and build an example coming with Piccolo controlSTICK Software v1.1 (sprc835.zip example PWM - Filtered HRPWM ) but adding the SFO lib v6 coming with F2802x_headers_and peripheral_files_sprc832.zip. In the beginning of main I add MEP_ScaleFactor...
    on Apr 23, 2009

  • Forum Post: Re: TMS320f28335 FOC with motor control library

    vsi-pete
    Dear hello84, I suggest you try VisSim/ECD. It is a block diagram language for embedded control targeted at TI C2000 devices. It has a complete motor control block set that allows off-line simulation, automatic C code generation and CCS compile. It will select the proper TI motor control library for...
    on Apr 28, 2009

  • Forum Post: EPwm Compare event skipped due to Synchronization

    yafawi
    In F28335 a synchronization can cause the skipping of an compare event in the EPwm , and is considered a normal operation . what is the best way to take this into account? Is there a compare event status bit that shows if a event has happened or not?
    on Jul 6, 2009

  • Forum Post: Re: Major Bugs found in the sample code for SFO library and ePWM documents.

    CChang
    Bob, The most accurate source for code examples is in the C/C++ Header Files and Peripheral examples packages (SPRC530 for 2833x/2823x devices) on the product folder websites. The user guide documentation is not always up-to-date, and can contain typos because it is documentation. All the example code...
    on Jul 30, 2009

  • Forum Post: Re: how many simultaneous PWMs can 28335 generate maximum?

    Mustafa
    Hello Brett, thank you for the answer, I will be confident with F28335 while starting the project. I don't have experience with TI DSP architectures. I started reading the user's guide you suggested. I am confused with different ePWM submodules. I will use PWMs to control servo motors. 8...
    on Aug 8, 2009

  • Forum Post: Re: is this correct one or not?

    Naveen Rangu
    Thank you Lori may i know what is the advantage of eCAP over ePWM? if eCAP is used in APWM mode,then how to change the duty cycle of it? i hope there is no chance to change the duty cycle of the PWM wave using eCAP if so,kindly tell me the procedure to do Regards, Naveen
    on Mar 4, 2010

  • Forum Post: Help! I am at my wits end. My code inconsistently operates (somes it will enter an interrupt, sometimes it will not)

    gideon prior
    Hello all, I am having a problem with the ezDSP using the TI TMS320f28335. I need to eventually use this to switch up to 2000 Amps in a motor and needless to say it needs to be rock solid. I have set up a test program, where I initialize the chip, setting up the ADC and a timer using the ePWM peripheral...
    on Mar 16, 2010

  • Forum Post: Lost USB connection with the eZdsp

    gideon prior
    Hello all, I have been having trouble keeping the eZdsp (320f28335) connected to code composer studio. I have read several other similar posts and tried the suggestions to no avail. To diagnose the problem, I have set up a very simple circuit where I connect the epwm1a output to a digital isolator...
    on Mar 31, 2010

  • Forum Post: Different PWM techniques using Piccolo

    Elijah Toppo
    Hello, I am new to this site and also new to using MCUs. I've just got a Piccolo F28127 and want to experiment producing the different PWM techniques for a simple basic inverter. The different PWM techniques that I want to realize are 1) Single PWM 2) Multiple PWM 3) Sinusoidal PWM...
    on Apr 3, 2010

  • Forum Post: SWITCHING REGULATOR USING 28027USB

    salil desai
    HELLO I'M TRYING TO BUILD A SWITCHING REGULATOR USING THE F28027USB CONTROL STICK....I AM DRIVING A FULL MOSFET H-BRIDGE USING COMPLEMENTRY OUTPUTS FROM PWM1A AND PWM1B SINEWAVE PWM AFTER BOOTSTRAPPING...I'V IMPLEMENTED A VERY CRUDE SOFTSTART BUT IT WORKS...ONCE THE MOSFETS START SWITCHING AT...
    on Apr 12, 2010

  • Forum Post: tms320f2808 Pwm Trip zone force

    Giuseppe F.
    hi, I need to disable the pwm output for a few cycles and re-enable it synchronously with pwm rate. (i'm talking about tms320f2808 but I think tms3202833x should have the same PWM peripheral block) I'm trying this solution: I'm trying to use the "Trip-Zone Force Register"...
    on May 31, 2010

  • Forum Post: Re: Sync out from PWM

    Tim Love
    Muhammad, What ePWM modules are you using and what SYNCO signal are you trying to output? The only SYNCO signal that is tied to the GPIO MUX is from the ePWM1 module. If you are not outputting the SYNCO from ePWM1 then this is not going to work. Regards, Tim Love
    on Aug 4, 2010

  • Forum Post: Re: [2833x] ePWM signals not coming out on pins

    Victor Sanchez
    Hi I have the same problem with this signals. The eZdsp card uses a multiplexer (U23) to address this signals controlled by the SW2 dip switch. However, the multiplexer fails when the epwm5 is selected. The output multiplexer (U23) attenuates epwm5A signal(you can see the signal with a scale of 50...
    on Aug 25, 2010

  • Forum Post: First ePWM toggle action when counter equals zero and the action-qualifier is in toggle mode versus set mode?

    Manoel
    Hi, If I set the AQCTLA.bit.ZRO = AQ_SET in the code snippet below, then the PWM output goes to logic level high right after making TBCLKSYNC = 1, which is what I expected. However, if I set the AQCTLA.bit.ZRO = AQ_TOGGLE, the PWM output remains low and only toggles high after the counter wraps...
    on Sep 9, 2010

  • Forum Post: digital compare with multiple sources

    Max Sonnaillon
    Hello, I need to use multiple comparator outputs (COMP1OUT, COMP2OUT) to trip the same PWM channel in the Piccolo B MCU. Is it possible? DCTRIPSEL seems to accept only one source for tripping. I need to have an over-current protection with one comparator and an over-voltage protection with another...
    on Sep 29, 2010

  • Forum Post: Can DMA be used to send a waveform to the ePWM?

    Maxpower
    Can I use DMA to read data from a lookup table and output to the ePWM? I need only one word to tranfer at a time. So far I have only been able to have 1 word to transfer and have to use the DMA ISR to change the source address so it increments through my lookup table. This seems to defeat the purpose...
    on Oct 5, 2010

  • Forum Post: SyncIn and SyncOut

    Anders Lange
    Hi. Anyone got small examples how to use the SyncIn/Out features on the TMS320F28235 Delfino device? Regards Anders Lange
    on Oct 12, 2010

  • Forum Post: Working ePWM code on Experiment Kit F28335 does not provide pwm output on Ezdsp F28335

    brent moulton
    I'm using CCS ver 4 with latest updates with Blackhawk USB2000 controller (latest drivers). I've been testing pwm code for ePWM 1-5 on the Experimenter Kit F28335 DIP100 board and have no issues (both RAM and FLASH along with CPU timers and GPIO toggling) and the ePWM work exactly as required...
    on Oct 19, 2010

  • Forum Post: Deflino F28335 ePWM Module Dead-Band Generator Submodule

    Josef Cupic
    Dear Support Team We are developing motor control software on a Delfino F28334 microcontroller. In this context we are using the enhanced PWM (ePWM) module with the Dead-Band Generator submodule to control the opposed halfbridges. Currently we have a control algorithm that writes new values into Rising...
    on Nov 18, 2010
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