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ADC
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  • Forum Post: Interrupt priority

    Polp
    Dear all, I'm using the ADC of my TMS320F28335 in DMA mode. Thus I have an ISR ( local_DINTCH1_ISR ) associated to the DMA channel1 (PieVectTable.DINTCH1 = &local_DINTCH1_ISR;). Then I have created another ISR with lower priority: low_priority_ISR , that I have associated to PieVectTable.rsvd12_6...
    on Jul 18, 2008

  • Forum Post: Re: Interrupt priority

    Frank Bormann
    Allessandro, by default all other interrupts, including higher prioritzed interrupts, are disabled when the 28x enters an ISR. This is done in hardware and based on INTM. With the return from the ISR the INTM switch is closed again. This principle is called "non nested". Now, if you like...
    on Jul 21, 2008

  • Forum Post: F28235 ADC DELAY_US

    Magnus Wohlfart
    Champs, I have a customer whose program is only running normally, when he doesn't use the "DELAY_US" function in the "DSP2833x_Adc.c" He would like to use the "DELAY_US" function to wait for e.g. 20us. When running and debugging from RAM there is no problem...
    on Aug 18, 2008

  • Forum Post: Re: ADC examples

    Tim Love
    Gaston, All of the examples included in the Header Files package are configured for boot to RAM option (with the exception of the flash example). This allows for quick and efficient evaluation for each peripheral. The flash example can be used as a template to convert the rest of the projects. There...
    on Dec 17, 2008

  • Forum Post: Re: TMS320F28335 Internel ADC calibration

    BrandonAzbell
    SAP I would like get some information regarding the ADC calibration, it will be helpful if some can provide the link for appnote/example codes The TMS320F28335 Product Folder has many User's Guides including one for the ADC which is in SPRU812 . Section 1.8 of this document discusses the ADC...
    on Feb 9, 2009

  • Forum Post: Re: ADC accuracy of different 28x DSPs?

    Tim Love
    Stephan, You can achieve pretty good accuracy with the ADCs on the F28xx devices by using appropriate layout recommendations and also using calibration. The F280xx, F2833x, and F2802x ADCs also contain Offset Trim registers to reduce the inherent offset. You can read more about the offset trim in...
    on Feb 12, 2009

  • Forum Post: Interfacing analog audio line-in to 28335 ADC

    Danielle Costantino
    I recently purchased a TMDSDOCK28335 "Delfino" F28335 Experimenter's Kit, and intend to use the F28335 microcontroller in a new project we are working on. After researching ways to interface signals to an ADC we could not find a way to correctly bias the audio signal in with the available...
    on Mar 27, 2009

  • Forum Post: Re: 28335 ADCs, DSPs, and FFTs.

    BrandonAzbell
    You mention already having the FFT library, so I presume you are using the C2000 Signal Processing Libraries found here ? Firstly, I would suggest making sure the ADC samples in memory look to be correct. If you generate a known sine wave into your setup, do you see appropriate values in memory? You...
    on Mar 31, 2009

  • Forum Post: Re: Interrupt priority

    Giovanni Menini
    dear all and in particular alessandro.... I'm using the ADC of my TMS320F28335 in DMA mode. I try to use the example: Example_2833xAdcToDMA.c but it doesn't work well...in particular the adc works in a good way but the DMA doesn't work. when I see the DMA registers I find all 0. The program...
    on May 19, 2009

  • Forum Post: Re: Interrupt priority

    Lori Heustess
    If peripheral registers read back all 0 and cannot be written to in the memory window then I suggest checking that the clock to the peripheral is turned on. For the DMA it is the PCLKCR3 register. EALLOW; .... SysCtrlRegs.PCLKCR3.bit.DMAENCLK = 1; // DMA Clock ... EDIS; In the header file...
    on May 20, 2009

  • Forum Post: Re: Interrupt priority

    Giovanni Menini
    It was the problem......I hadn't found this information in the document..... thanks a lot now i can use my DMA thanks bye Giovanni
    on May 20, 2009

  • Forum Post: regarding adc interrupts usage in tms320f28335

    hari prasad12102
    Sir, I am using tms320f28335 dsc. In that while i am using ADC in interrupt mode with SEQ_INTx the program not entering into the ISR continuosly. For this i have kept an infinite loop.In that i am giving SOC triggering through software. Why can't i get the results correctly. My main need is to...
    on May 21, 2009

  • Forum Post: TMS320F28234 ADC timing question

    chuckwagon
    Hi Champs, I have a question about how document SPRS439 describes the ADC timing. In document SPRS439 rev F, section 6.15.4 ("Simultaneous Sampling Mode (Dual_Channel) (SMODE=1)"), paragraph 1 (page 156), the fifth sentence states "The ADC interrupt flags are set a few SYSCLKOUT cycles...
    on May 22, 2009

  • Forum Post: Re: regarding adc interrupts usage in tms320f28335

    BrandonAzbell
    Are you getting an ADC Sequencer Interrupt? You mention not entering the ISR continuously. Are you perhaps running in the START/STOP mode and not Continuous Run mode?
    on May 23, 2009

  • Forum Post: 28035 ADC characterization

    Clark Molster
    Hi, Do we have any additional data/spec.s we can provide regarding Piccolo B ADC performance? We have a customer with the following questions. The specified INL (integral non-linearity) of the on-chip ADC is +/-2 LSB (typical) (TMS320F28035 datasheet, page 116). My questions are: 1) is that the maximum...
    on Jun 12, 2009

  • Forum Post: Re: 28035 ADC characterization

    Nicholas Smith12553
    Clark, A) The Piccolo-B TMX datasheet lists INL as a typical because we have not completed characterization. The 2808 part is TMS released and thus all ADC parameters have been characterized in order to spec an actual min and max value. A2) INL does degrade with increasing temperature and improves...
    on Jun 15, 2009

  • Forum Post: Programming for TMS320F28335 - Is it ok to avoid ADC check?

    cricho
    Hello everybody, I am programing an IIR filter that has to be executed really fast. It works with the measurement from the ADC. In order to improve the speed of the function, I have removed the next ADC checking: while (AdcRegs.ADCST.bit.INT_SEQ1== 0){} AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1; This...
    on Jun 18, 2009

  • Forum Post: F2809 few questions adc, isr

    Leszek Kaczmarek
    Hello, I`m using TMS320F2809 with 100MHz clock. 1. I would like to get some info about init of adc and then using it. There is a need to use two adc inputs but used independently, if i want to sample channel 0 should i do sth like?: AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0; AdcRegs.ADCTRL2.bit.SOC_SEQ1...
    on Jul 1, 2009

  • Forum Post: ISR for ADC is not working on F28335

    Chintan Chauhan
    Hi, To all, I m working on ADC. As per example i have taken ADC sample in continuous polling like this way EALLOW; SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 1; ADC_cal(); EDIS; AdcRegs.ADCTRL3.all = 0x00E0; // Power up bandgap/reference/ADC circuits delay(50000); // Delay before converting...
    on Jul 3, 2009

  • Forum Post: Re: ISR for ADC is not working on F28335

    Chintan Chauhan
    Thanks, Alexander I have seent that example and according to that example i am able to get ADC interrupt but in this example SOC is on ePWM_SOCA_SEQ1, 1=SEQ1 start from ePWM_SOCA trigger, but i want to make it in Software trigger base as i want to start it once and want to get regular interrupt...
    on Jul 5, 2009

  • Forum Post: Re: Piccolo ADC accuracy/noise

    Nicholas Smith12553
    Stephan, By using the temperature sensor to measure the DC code spread (or digital variation), you are measuring the variation of both the ADC and temperature sensor output, instead of ADC output only. Since the temperature sensor will vary with junction temperature changes while running code, it should...
    on Aug 20, 2009

  • Forum Post: F28335 ADC - quality of first sample @ simultaneous sampling

    JoeHu
    Hi, I'm using a TMS320F28335 on an eZdsp evaluation board and experience some "trouble" with the ADC. The device is configured as following: ADCCLK= 25 MHz ; ACQPS = 1 ; CPS = 0 --> sampling time = 80ns. Simultaneous sampling! Start-Stop-Mode. The first conversion is started...
    on Aug 26, 2009

  • Forum Post: 2808 ADC Question

    Matt15382
    Hello, I have a few questions regarding the ADC module on the TMS320f2808, specifically with the ADC input channel select registers. Is it possible to safely change the values of the channel select registers while and ADC sequence is running, such as in continuous run mode? When exactly do the channel...
    on Sep 25, 2009

  • Forum Post: Some Questions about TMS320C28346

    SX-Florian
    Hi all, i have two question about TMS320C28346. 1. Interface to an external ADC Which pin/signal should i use to connect EOC_N (end of conversion) from an adc? I would like to use the McBSP Interface to connect with the SPI Slave Interface from ADC. Moreover, i connected the EXTSOC1A to the...
    on Oct 21, 2009

  • Forum Post: f28335 ADC input noise

    hasan mutlu
    i have tms320f28335 experimenter kit. i designed ADC input interface with opamps. Interfcace circuit good working (very low noise) while the output port is not connected to the ADC input of the DSP. But when i connect the output of the interface circuit to the ADC input of the DSP signal noise increases...
    on Nov 17, 2009
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