Stellaris® ARM® Microcontrollers

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Stellaris® ARM® Microcontrollers

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Related Posts

  • Forum Post: Crystal Specs for the main OSC LM3S9B96

    Tim Lafferty
    The data sheet only specs the frequency for the crystal for the main oscillator. There are specs for the Ethernet crystal, but not the main crystal. Need the following: Shunt and load Capacitance Series resistance PPM
    on Mar 2, 2010

  • Forum Post: LM3S6965 Internal clock as PLL input

    fjdepedro
    In the LM3S6965 datasheet, in point 6.4 (register descriptions of system control), when describing field OSCSRC of register RCC you can see the next: Oscillator Source Selects the input source for the OSC. The values are: 0x2 IOSC/4 Internal oscillator / 4 (this is necessary if used as input to PLL...
    on Jun 9, 2010

  • Forum Post: Set Clock DK-LM3S9B96 while a SPI communication

    Perhirin Steven
    Hi, When I sending data by SSI protocole, I writte it : SSIDataPut(SSI_BASE, 0xFF); A clock will be created( generated ) (output : SCLK) in the same time at 1 MHz ( 8 bits clock ) Then I get my data : SSIDataGet(SSI0_BASE, &pulRawInitData[0]); My question is the following : Could...
    on Oct 18, 2010

  • Forum Post: SSIClock of the DK-LM3S9B96 at 6 MHz, Possible?

    Perhirin Steven
    HI, As SCLK of a SSI connection, I have 1 MHz. Is it possible to set this clock at 6 MHz? If that is possible, How should I do (step by step for a beginner :) )? I found ulSSIClk in ssi.c, unfortunatly I didn't figure out how to configurated it. Thank you for your help. Steven
    on Oct 19, 2010

  • Forum Post: Re: SSIClock of the DK-LM3S9B96 at 6 MHz, Possible?

    Perhirin Steven
    Hi, I set my main.c like this: #define SSICR0Base 0x40008000 #define SSICR0L (*((volatile unsigned int *) (SSICR0Base) )) #define SSICPSRbase 0x40008010 #define SSICPSRE (*((volatile unsigned char *) (SSICPSRbase) )) SSICPSRE=0x03; // CPSDVSR SSICR0L=0x0007; //SCR Then I found that : SSIClk...
    on Oct 26, 2010

  • Forum Post: slow clock startup

    schneiderham
    Hi, We just developed a board with a LM3S2793 Rev C3 and I noticed that it takes 98ms for the first instruction "SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);" to execute. According to the datasheet it should only take a maximum of 20ms for the 16Mhz...
    on Jan 8, 2011

  • Forum Post: Stellaris Peripheral SSI Clock rate function potential bug

    Paul Carpenter
    In ssi.c function SSIConfigSetExpClk, there is a rounding error in the first line of this snippet // // Set the clock predivider. // ulMaxBitRate = ulSSIClk / ulBitRate; ulPreDiv = 0; do { ulPreDiv += 2; ulSCR = (ulMaxBitRate / ulPreDiv) - 1; } while(ulSCR > 255); The division creates a value...
    on Jan 21, 2011

  • Forum Post: Crystals for LM3S9B92

    Justin Forrester
    I have been reviewing the datasheet for the LM3S9B92 and I have found a contradiction regarding the Main Oscillator setup. In section 1.1.5.2 it says that a two-pin external crystal connected to OSC0 and OSC1 can have a clock range from DC to maximum device speed, whereas a single-ended clock source...
    on May 25, 2011

  • Forum Post: Stellaris LM3S6918 Clock/jtag problem

    Urban Stadler
    Hello, I have a problem with the Stellaris LM3S6918 board. I’m using J-Link and Keil uVision 4. I was using this setup for a while when i downloaded my code and the board would boot anymore. I though t that I had an error in the code but after downloading some known good code (Samples provided...
    on Jul 9, 2011

  • Forum Post: Configuring SSI clock

    Swapnil Kulkarni80596
    Hello, I am using LM3S6911 at 25 MHZ. I need to interface some chips using SSI. But I can set SSI clock only at 2MHz, 4MHz, 6MHz and 12 MHz. When I am running my system at 50MHz, SSI clock frequencies are 4, 5, 6, 8, 12 and 25 MHz. Is there any way to set SSI clock frequency other than...
    on Aug 1, 2011

  • Forum Post: Clock and ADC setup for LM3S2965

    David J Schmidt
    I have couple question s on programm ing the TI micro LM3S2965 . 1. Clock setup – I am using a n external 8MHz oscillator , 4 channel ADC and CAN bus for communication to other 2 boards . In TI data spec., it must use PLL i f ADC are used. When I inherit the code, it was already setup to...
    on Aug 8, 2011

  • Forum Post: Re: Lm3s9b96 FIFO

    Perhirin Steven
    Unfortunatly, I'm not referring any FIFO in the LM3S9B96. If I can use one of it, it's will be enough. At this stage I'm using SSI FIFO for etablish a communication between another station, so this FIFO arn't not available. Could you please advice me in the choose of FIFO in the LM3S9B96...
    on Sep 8, 2011

  • Forum Post: Delays During Clock Configuration (Stellarisware)

    Ken Koller
    Hi, In SysCtlClockSet() there are few delays (Calls to SysCtlDelay) with comments like "wait for a bit". There are bits to test when the PLL or the main oscillator should be stable. Why are these delays in the code and, assuming they are rooted in something, where are these details covered...
    on Sep 7, 2011

  • Forum Post: use GPIO to clock LM3S8962

    Kerri Stone
    Hello, I am wondering if it is possible to clock the LM3S8962 evaluation kit from a 10MHz or 5MHz signal connected to GPIO? Does anyone have suggestions on how to do so? Thanks! Kerri
    on Sep 21, 2011

  • Forum Post: Re: use GPIO to clock LM3S8962

    Andy Neil
    Not sure what you actually mean here? The processor clock must be provided by: either the internal oscillator, or via the oscillator pin(s). This is a thread about clocking: http://e2e.ti.com/support/microcontrollers/stellaris_arm_cortex-m3_microcontroller/f/471/t/135114.aspx
    on Sep 21, 2011

  • Forum Post: providing an external clock reference for the DK-LM3S9B96

    Kerri Stone
    Hello: I am using the DK-LM3S9B96 development kit to develop a high accuracy time stamping application. I would like to attach a chip scale atomic clock to the DK-LM3S9B96 to provide a very accurate clock reference for the application. What is the best way to attach the clock to the development...
    on Sep 8, 2011

  • Forum Post: SysCtlClockSet hangs

    Pierre Pardo
    Hi all, My program starts with following line SysCtlClockSet(SYSCTL_USE_OSC | SYSCTL_OSC_INT); and everything works fine. After some initialization, I try to change clock settings with a SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_8MHZ); And the software...
    on Sep 29, 2011

  • Forum Post: Re: JTAG flash programming and clock, LM3S6965

    Thierry Cachat
    Dear Sue The thread you mention is related to our problem, but it does not really solve it. It seems several people have difficulties using JTAG without external oscillator, on different version of Stellaris. We do not want to use the bootloader, we do not want to program the part using the serial...
    on Oct 19, 2011

  • Forum Post: Re: JTAG flash programming and clock, LM3S6965

    Thierry Cachat
    Dear Sue Indeed I did not understand to which question I had to answer. I cannot check all details right now, but: We use a Custom board, that is why we can have an external oscillator or not. We can perfectly program and debug the Stellaris when the external oscillator is present , that...
    on Oct 19, 2011

  • Forum Post: Re: JTAG flash programming and clock, LM3S6965

    Thierry Cachat
    Dear Sue I finally have made an experiment that could be of interest for you and other people, because I am not sure that you can predict the result. I have programmed the evaluation kit with the "Hello world" program where I have modified the "hello.c" in the following way...
    on Oct 20, 2011

  • Forum Post: JTAG flash programming and clock, LM3S6965

    Thierry Cachat
    We have a problem related to the one mentioned in http://e2e.ti.com/support/microcontrollers/stellaris_arm_cortex-m3_microcontroller/f/471/t/44603.aspx But we use a different part: LM3S6965, and the proposed solution does not work. We are not able to program (or debug) the flash by JTAG when the external...
    on Oct 18, 2011

  • Forum Post: Stellaris Tech Support

    -mark
    Is there a way to get timely tech support for the Stellaris devices? Sorry, but this e2e support community seems hit or miss. There is much uncertainty regarding when or if you will receive a satisfactory answer. I've called TI tech support and am still awaiting an answer. Does anyone know...
    on Nov 4, 2011

  • Forum Post: Clock signal during device is unpowered

    Ti Me
    Hi I'd like to know, if it is allowed, to apply a clock signal of a 3.3V / 25MHz oscillator to pin XTALPPHY, during the LM3S9792 device is unpowered. Thank you in advance! Timmy
    on Dec 12, 2011

  • Forum Post: Re: LM3S9B96, EPI clock polarity

    Perhirin Steven
    Hi Ken, Thank you for you reply. I'm using EPI in general purpose. In order to reference a specific electrical spec timing, I chose : Figure 9-21. EPI Clock Operation, CLKGATE=1, WR2CYC=0. I see that data changed state on rising edge, but datasheet specifiy this change on falling edge. Output...
    on Jan 4, 2012

  • Forum Post: LM3S9B96, EPI clock polarity

    Perhirin Steven
    Hi, First of all, happy new year and best wishes !! I need help on EPI clock configuration. I went throught all datasheet and I could not find if is possible to change the polarity of EPI clock on pin EPI0S31 ? I looked at the Digital timing diagram in the data sheet and all data are send on...
    on Jan 4, 2012
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