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ADC
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  • Forum Post: Re: Obtaining Meaningful Data from ADC results

    cb1-
    Lost is "output to an Lcd module." (unless you have one with a serial front-end - and have initialized & properly placed signal labels and cursor) To output to a text Lcd one should isolate the most significant digit - massage into ascii (i.e. 0 -> 0x30, 4 -> 0x34) - then pulse...
    on Jan 23, 2011

  • Forum Post: analog voltage output [0V - 10V]

    opaki ikapo
    How can I generate digitaly controlled analog output voltage using Stellaris MCU? Voltage range is 0V to 10V. Can someone suggest me a schematic for that case? Thanks in advance...
    on Jan 25, 2011

  • Forum Post: ADC differential not working!

    Henrik Lindstr���
    Hi, Card used: LM3S9b96 I am using ADC0 to sample 8 single ended signals and ADC1 to sample 3 differential channels. The problem is that i want to use channel 2,3 and 6 as differential channels on ADC1 but i can only get the first 4 channels to work (ch0,ch1,ch2,ch3). The other channels only...
    on Jan 27, 2011

  • Forum Post: ADC Problem with LM3S8962 on Eval Board

    PR
    Hello, I am working on a project with the LM3S8962 Evaluation Board. I am trying to test the ADC to see how a value gets read in before I can connect a few analog sensors that I would like to get data from. I tried using the example adc peripheral code from the software provided in the CD. I ran...
    on Mar 29, 2011

  • Forum Post: The question of Initialization and Configuration the ADC Module

    Maojun
    MCU : Stellaris LM3S608, External Crystal Oscillator 6MHz, IAR 5.5 I want to reduce the system power comsumption by reducing the MCU clock frequency. And I will use the ADC module in the system. In the Datasheet of LM3s608 : " In order for the ADC module to be used, the PLL must be enabled...
    on Feb 28, 2011

  • Forum Post: LM3S2965 SPI Communication

    Justin Forrester
    Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 ...
    on May 12, 2011

  • Forum Post: Full Scale Gain Calibration Issue

    Michael Wood
    Hi, My ADC digital value is maxing out at about 1.8 V, not the internal band gap set 3.3 V. Everything is initialized correctly and I'm even running sample code from TI. When I run the code without CCS I still get the issue. I've tried running the following to call Device_cal() after the original...
    on Jun 12, 2011

  • Forum Post: ADC Problems

    eeboy
    I am having trouble getting a reasonable reading from an ADC channel. I have verified that I have a clean signal at the input but my conversion comes in MUCH higher and bounces around. For example, I currently have a voltage of 200mV on the pin and I am getting readings between 1023 and 600. The temperature...
    on Jun 23, 2011

  • Forum Post: Re: ADC Sequencer (inconsistent readings)

    Santhosh Ramani
    Hello, Upon further inspection - I found that every alternate reading is same or very close. Please see attached image.. Thank you Regards
    on Jul 7, 2011

  • Forum Post: Problem with ADC ISRs

    Adithya Kiran
    Hi, I'm using a custom board with the LM3S6965 part running at 8 Mhz. I am using IAR EW. When I use the code given below, my ADC does not generate any interrupts. What is wrong here? Am I missing something? P.S: I have registered the interrupts in startup.c void InitADC() { SysCtlPeripheralEnable...
    on May 26, 2011

  • Forum Post: problem in using 2nd adc module in lm3s828

    Venugopala P.K.
    hi, i am working on controller lm3s282 in ccs v4 IDE, i use adc ,ADC0_BASE module is working fine ,i need 2 module(ADC1_BASE) for faster opreation when ever the control comes to following function control goes to fault isr ADCSequenceConfigure(ADC1_BASE, 0, ADC_TRIGGER_PROCESSOR, 0); // control...
    on Jul 29, 2011

  • Forum Post: ADC Initialization, LM3S9B96

    Thomas Gay
    Hello When reading from the internal Temp-Sensor, I get reasonable data. When reading from the analog Inputs, I get "all zeroes", no matter how I try to configure the Sequencer. There must be a common error in all my poor attempts, which I do not find. Would anyone have a suggestion where...
    on Aug 12, 2011

  • Forum Post: Re: ADC channels reading

    Dave Wilson
    Linas, There are a couple of things that may explain the behavior you are seeing. The first one, and likely the cause, is that you seem not to clear the ADC interrupt after polling it to check for completion of the first 8 samples. You should call ADCIntClear(ADC0_BASE, 0) after your polling loop...
    on Sep 13, 2011

  • Forum Post: RDK-BLDC current calculation

    newtothis
    In the RDK-BLDC, how does the PHASE_CURRENT_CALC macro account for negative phase currents? If one was to use this for calculating the instantaneous current in each phase all one would have to do is treat the result of the PHASE_CURENT_CALC macro as a signed number, correct? Ultimately, the idea is...
    on Sep 14, 2011

  • Forum Post: GPIO Interrupt to ADC Sequence

    Courtenay Smith84818
    Hi, I am working with the EKK-LM3S3748 evaluation board (Keil Tools). I would like to capture 512 samples from ADC0 when a rising edge is seen on GPIO D pin 1 (PHA0). Below is the code that I've written which to perform this task. To provide the rising edges which trigger the interrupt, I am passing...
    on Sep 25, 2011

  • Forum Post: ADC Conversion trigger by timer using StellarisWare

    zlalanne
    Hello, I am trying to start an ADC conversion using a timer interrupt and plan on reading the result of the ADC conversion via an ADC interrupt. I am trying to write as much of the code as possible using StellarisWare functions. However, I can not determine the right function to configure the timer...
    on Oct 12, 2011

  • Forum Post: Hardware oversampling & reading

    Vladimir Aparin
    I want to confuguring 2 ADC channels to oversampling 4 each. I setup ADC0 sequence 0 to always triggering, low priority, termal sensor; sequence 1 to processor triggering, high priority, ch1. All working. But, when i setup oversampling by function ADCHardwareOversampleConfigure(ADC0_BASE, 4); ...
    on Nov 13, 2011

  • Forum Post: ADC Ekc-lm3s8962, Reading from ADC0, ADC1 and ADC2

    kranthi mamidi
    Hi, I am trying to read ADC values from multiple sequences. I am unable to do so, the values being read are same. Below is the code I used to read from mulitple adc pins %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0); ADCSequenceConfigure...
    on Nov 20, 2011

  • Forum Post: ADC Oversampling 8x

    Kenneth Glintborg Vejen
    So i'm having problems implementing the oversampling to my ongoing project. I have a few questions to the example code, because it is making errors. As for the interrupt, where do I find what to include in ulCount. Because I can't find any examples on the forum nor the examples: main.c:153:2...
    on Dec 2, 2011

  • Forum Post: ADC Sampling with Timer Trigger

    Courtenay Smith84818
    Hi, I am using the EKI - LM3S3748 evaluation kit. I am trying to collect 2500 samples at 500kbps using the ADC with a timer trigger. My approach is as follows: 1) Set the timer to count to 8/500e3*50e6 = 800, where 8 is the depth of the FiFo for Sample Sequence 0, 500e3 is the ADC sample rate, and...
    on Dec 15, 2011

  • Forum Post: ADC reading from multichannel (4 pins) with oversampling x8

    Marcin Lis
    Hi all! I am using EKS-LM3S8962 Stellaris board; CCS 4.2.2. I'd like to do adc reading from 4 different sources. I want to use pins ADC0, ADC1, ADC2 and ADC3. My initialization code for ADC looks like this: SysCtlADCSpeedSet(SYSCTL_ADCSPEED_250KSPS); SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0...
    on Dec 28, 2011

  • Forum Post: Unable to make PWM trigger ADC sample sequence

    Pelle Windestam
    I am unable to make my PWM generator to trigger an ADC sampling sequence. I'm using PWM1 generators 1, 2 and 3 to generate 6 synchronized PWM outputs, which I want to use to trigger an ADC sampling sequence. I tried setting up the ADC to be triggered from a timer, which works as expected. The...
    on Jan 11, 2012

  • Forum Post: LM3S6918: Acquisition with GPIO pins and Generation with DAC

    Dario Pratic���
    Hi, I'm working with a single board Eagle 100. I have to emit four signals using the DACs and simultaneously read another signal. The signals are the same for the four channels. They have a sinusoidal waveform at 60 kHz of frequency. The input signal is binary with the same frequency of the...
    on Jan 30, 2012

  • Forum Post: SPI interface to ADC

    Klaus Baudelaire
    I am trying to interface an ads8517 ADC with my stellaris 3749, and I am having trouble reconciling the information I am getting from the two datasheets. In the ADC's datasheet, it says that the R/C or CS signal should be put low to start a conversion and begin serial transmission, and according...
    on Feb 12, 2012

  • Forum Post: Re: LM3S9D96: During erasing flash, ADC gives overflow IRQ

    Stellaris Miles
    Timucin, Assuming all your other register settings are correct, if you're sampling at millisecond granularities, then the problem you're most likely experiencing is a simple one to explain: When reprogramming flash, it is unavailable. Thus, if you're executing from flash and you take an...
    on Feb 16, 2012
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