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ADC
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  • 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: MSP-EXP430FG4618 Pin-out

    Mike2108
    I've been searching in vain for a pinout list or diagram or similar for the MSP-EXP430FG4618 experimenter's board. Basically, I want to send the output of the digital-to-analog converter to one of the breadboard pins - is that possible in software and/or hardware? Also, is it possible to...
    on Jan 21, 2009

  • Forum Post: SD16 ADC on MSP430x2xx Family MCU

    Mike2108
    A fairly simple question here! Can someone please explain to me what exactly the register SD16AEx controls in the MSP430x2xx MCUs? My understanding from reading the User Manual is that it enables or disables the use of an external analog input to the sigma-delta adc depending on whether it's...
    on Feb 4, 2009

  • Forum Post: Re: SD16 ADC on MSP430x2xx Family MCU

    Priya Thanigai
    Hello, The SD16AE bits do 2 things 1) they enable/ disable the analog input pin and 2) they disable any digital circuitry (like multiplexed GPIOs) . The working is a little complex but can be understod easily with the help of the 'Application Information' section in the F20x3 datasheet. ...
    on Feb 4, 2009

  • Forum Post: Re: SD16 ADC on MSP430x2xx Family MCU

    BrandonAzbell
    The SD16AE register is used at the device level to configure the pins for the appropriate functionality. The MSP430x2xx Family User's Guide ( SLAU114 ) will provide descriptions at the module level, but sometimes you will need to reference the specific device datasheet to determine how everything...
    on Feb 4, 2009

  • 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: MSP-EXP430FG4618 Anti-Aliasing Filter

    Mike2108
    Does the MSP-EXP430FG4618 Experimenter's board have an analog Anti-Aliasing filter at the input to the ADC of either the MSP430F2013 or the MSP430FG4618? I'll be sampling at 256 Hz, and so was wondering if I should use an RC lowpass filter as an anti-aliasing filter before the ADC.
    on Feb 10, 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: ez430-rf2500 sample and transmit

    Martyn Ferry
    Hi, I am trying to write a project using the msp430 ez430-rf2500. I have experience in C programming, but I am struggling to come to terms with programming the msp430. My aim is to sample an analogue input to the unit a few thousand times a second through one of the accessible pins connected to the...
    on Feb 26, 2009

  • Forum Post: TI ADS 5481

    Elizabeth Thompson
    Regarding TI ADS 5481 Analog-to-Digital Converter, does TI have a microcontroller with this device embedded? If not, is there a microcontroller to which it can be easily interfaced? Can it be directly interfaced to memory without a microcontroller? Finally, it appears that this chip only accepts 1 analog...
    on Mar 11, 2009

  • Forum Post: EZ430-RF2500 Oscillating values on ADC10 A0 and A1

    Vikram Ambrose
    Hello Everyone. This is my last resort to figuring this problem out. I've used other MSP430s before, so I'm not new to the game. No matter what I try to do, A0 and A1 return an oscillating value between 200 to 500. A2 readings are fine. Here is my code: unsigned short ADC_convert_CH...
    on Mar 18, 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: MSP430 for Medical Implantable Devices

    Efrain Gaxiola-Sosa
    Thank you for your answer Brandon. I asked for the value of R because I wanted to add a capacitor in pararell with the resistor between the OA inverting input and the OA output. Doing so I will have a 1st order active RC filter that may work as antialiasing filter. If I have the value of R, depending...
    on Mar 30, 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: MSP430F5438 - ADC Setup Verify

    Alfredo
    I am attempting to use the ADC on my mspf5438 to trigger an LED at this point and later on a initiate UART communication. For now though I am trying to just light the LED. I am using the following code but the input voltage seems to be different than what I'm actually getting from conversions. My...
    on May 8, 2009

  • Forum Post: Re: SD16 ADC on MSP430x2xx Family MCU

    claudiu
    Glad to find this forum post since I have some similar question and the replies clarified a little bit the problem, but not entirely. I have some ADC code I wrote for F2012 and I wanted to use an F2013 instead which has a Sigma Delta module that I am not familiar with. To get some help starting, I...
    on May 11, 2009

  • Forum Post: Re: SD16 ADC on MSP430x2xx Family MCU

    Priya Thanigai
    1. Yes SD16AE2 sets the SD16 pin functionality for P1.2. The best place to look for this information is the D/s. 2. The SD16 differential input range is +/- 600mV. If the module is set in Bipolar mode the full scale range varies from Vmid + 600mV to Vmid - 600mV i.e. 1.2V. In the above mentioned...
    on May 11, 2009

  • Forum Post: Re: SD16 ADC on MSP430x2xx Family MCU

    claudiu
    Thanks a lot for your answer, Priya. I have to admit that I looked in the D/s but I got lost as regarding to Bipolar vs. Unipolar stuff. I looked again after reading your message and I wonder if now I got it right: if both SD16UNI and SD16DF are zero, it should mean Bipolar Offset Binary mode so SD16MEM0...
    on May 11, 2009

  • Forum Post: Re: SD16 ADC on MSP430x2xx Family MCU

    Priya Thanigai
    All of the information you are looking for is in the 2xx Family User's Guide. Here are a few examples to explain the different modes: Note: The SD16 takes in differential inputs limited to +/-600mV (see device D/s for FSR values). Bipolar Ouput: Offset Binary Vmid = 1.2V (negative input A...
    on May 14, 2009

  • Forum Post: Re: SD16 ADC on MSP430x2xx Family MCU

    claudiu
    I've read the Family User's Guide (it is my main reading and it helps a lot) but I guess I have some problems understanding the Sigma-Delta module. I will read this section a couple more times and then I will look again at your examples, maybe things will be clearer then. In any case, I am...
    on May 14, 2009

  • Forum Post: Re: SD16 ADC on MSP430x2xx Family MCU

    Priya Thanigai
    Yes, you're right the SD converter architecture invloves more reading and getting used to especially if you have previously worked with SAR ADCs like the ADC12. The key differences to remember are that the SD has a differential input, and the input voltage range swings around the Vmid or the common...
    on May 14, 2009

  • Forum Post: Re: MSP430F5438 -- UART interfering with ADC

    BrandonAzbell
    It is unclear what issue you are having, but I would suggest not having the call to Xbee_Command() within your ADC interrupt service routine. While you are in the interrupt service routine, the Global Interrupt Enable is "disabled", therefore no other interrupts will be recognized and serviced...
    on May 17, 2009

  • Forum Post: Re: MSP430F5438 -- UART interfering with ADC

    Alfredo
    I am sorry, I was trying to explain my code and forgot to explain the real problem. The thing is that when I initialize both the ADC and the UART, my code will never enter into the ISR. If I initialize the UART and comment out the ADC code, then I can send all the commands I'd like. If I comment...
    on May 17, 2009
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