Stellaris® ARM® Microcontrollers

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SSI
Related Posts

  • Forum Post: How to know when the SSI Tx FIFO is done transmitting bytes?

    Derek9531
    Hello, I'm using the LM3S6965-EK as an SPI master and I've added on an additional SPI device (in this case, a TI Zigbee chip). Since the SPI port is already in use by other peripherals, I used a GPIO pin (PC4) to control the Chip Select line of the radio. But, since the Stellaris uses a tx...
    on May 25, 2010

  • Forum Post: Using SSI

    Trabaquini52367
    Hello, I want to make an application in which I can read a sensor and save the data at the memory card (SD card ), both using the SSI. I've programmed two pins for the chip select, GPIO Port B pin 2 and - GPIO Port G pin 0 ) . I try to read de value of a pin0 (Port G) and "fault interrupt"...
    on Jun 24, 2010

  • Forum Post: Re: Re:FatFs+SDcard: problem writing >2k file size

    Cesar Ofuchi
    Hello, I am using the LM3S6965, and I wanted to improve the writing speed at the SD Card, but keeping the file format to be able to acces the data using a PC. How did u implemented this optimization of the code? Can you give a example? Thanks in advance
    on Jun 25, 2010

  • Forum Post: LM3S9B96 - configuration of SSI

    Tomasz Rogalski
    Hi everyone, I would like to configure and later send data by SSI protocol. I'm trying to configure it but because I'm beginner I decided to ask for some help. I found some informations about configuration in Data Sheet but I would like to ask for some examples. Regards
    on Jul 7, 2010

  • Forum Post: SSI does not work?

    Tomasz Rogalski
    Hi Everybody, I try to send data trough SSI protocol. But something is wrong because on MOSI line I can not see anything. I expect too see for each bit one peak on the oscilloscope. If I am wrong please tell me. My program looks like that: int main(void) { FRESULT fresult; // Activamos el...
    on Jul 23, 2010

  • Forum Post: Re: Code Optimization for SPI External Memory

    Dave Wilson
    Jake, I've not run the code you provided or tried to compile it but, looking through it, it seems fine to me. I don't know what kind of performance improvements you are looking for but here are a few things you may consider depending upon your situation. 1. The code appears to be reading...
    on Aug 13, 2010

  • Forum Post: Re: SSI Frame signal in Master mode.

    Dave Wilson
    In this situation, we do exactly what you propose - use the SSI frame output as a GPIO and set it in software to select the device we want to communicate with. Obviously you will need 1 GPIO per slave device.
    on Sep 1, 2010

  • Forum Post: SSI Frame signal in Master mode.

    Peter Homann
    Hi, I am planning to use the SPI interface in master mode to access a number of slaves. As there are multiple slaves the SSI Frame output won't be used. Can I configure the Frame output P(A3) to be use as a GPIO? or, will I need to just leave the pin unconnected? Thanks Peter.
    on Sep 1, 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: Re: DMA Scatter Gather SSI Transmit - not starting

    Dustin Carr
    In This line of your code: &sDMAControlTable[(UDMA_CHANNEL_SSI0TX-1) | UDMA_ALT_SELECT], (sizeof(g_TaskTable) / sizeof(tDMAControlTable)) * 4); I think that UDMA_CHANNEL_SSI0TX-1 needs to be changed to UDMA_CHANNEL_SSI0TX. I could be wrong, but I see no reason for the -1. If I'm...
    on Oct 25, 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: 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: SSI FIFO clear in slave mode

    Asaf
    Hi, I'm working with LM3S3739's SSI1 as slave. Data is transmitted and received interrupt driven on Tx/Rx FIFO half full alerts. I notice that every transmission I start does not start with the data I wanted to transmit, which affects also my end of transmission that ends earlier than I expect...
    on Nov 1, 2010

  • Forum Post: FaultISR after Flash Access

    Ryan Tom
    I am using LM3S9B92 with Code Composer Studio Tools, right now I have a project set up based on the Hello_Widget example program that has been working well for our application. We added Flash Memory Access to the application, in doing so, we called the following 3 routines: // Enable Flash SysCtlPeripheralEnable...
    on Nov 9, 2010

  • Forum Post: Re: Mysterious io_cgi.ssi code in Stellarisware v6288, lm3s6965, enet_io

    Dave Wilson
    Let me see if I can explain this. On the browser (client), when the user presses the submit button, the values of all the form controls are encoded into a URI of the form: xxx.cgi?param1=val1&param2=val2&param3=val3 This is received at the server via a standard HTTP GET request. The...
    on Nov 12, 2010

  • Forum Post: Re: Serial Flash Sample C code examples

    Murlidhar Shivankar
    Hi, Thanks for reply. Actually I was searching an basic generic examples how to implement SSI along with available drivers from TI.
    on Dec 8, 2010

  • Forum Post: Re: Serial Flash Sample C code examples

    Murlidhar Shivankar
    Hi, Yes, I had a look in the examples and application notes with stellarisware. I was unable to see in it.
    on Dec 8, 2010

  • Forum Post: Serial Flash Sample C code examples

    Murlidhar Shivankar
    Hello, I'm starting up a new desing using SST25VF020B (2 Mbit SPI Serial Flash) device connected to a 4 wire SSI interface with Stellaris® LM3S9B96 Microcontroller. I got drivers on the sst site but not able to see any C Samples or example code. Can you please provide if any? ...
    on Dec 2, 2010

  • Forum Post: Re: SPI max clock speed on LM3S2948

    BrandonAzbell
    What Andy is referrring to is that there are really 2 answers to the maximum clock rate of the SPI interface on the LM3S2948. This is dependent on whether the LM3S2948 is the master on the SPI bus, or a slave on the SPI bus. This is documented in the datasheet in the Synchronous Serial Interface (SSI...
    on Dec 24, 2010

  • 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: Re: accessing winbond spi flash in LM3S9B96 Dev Kit

    BrandonElliott
    Hi Sampreeth Meti, sampreeth meti I am trying to access winbond spi flash memory on my lm3s9b96 dev kit , every time i could able to read only garbage values . Are the values totally incorrect, or are they bit-shifted? sampreeth meti clk,mosi signals are correct and verified through...
    on Feb 17, 2011

  • Forum Post: Initialization of a protocol Freescal SPI for SD Card on DK-LM3S9B96

    Guy Langlois
    Hello, I'm currently working on CCS v4 with a DK- LM3S9B96. I want to read and write on a SD Card with a SSI protocol (Freescale SPI, Clock Polarity Bit = 0, Phase Control Bit = 0). I'm using the following documentation : - Datasheet LM3S9B96 and DK-LM3S9B96-UM - FatFs Generic FAT File...
    on Feb 22, 2011

  • Forum Post: Cheap backplane communiaction @ Stellaris

    Lada Lostak
    Hello :o) I have to setup "relative" fast communication between devices based on Stellaris CPU (LM3S600/LM3S6911). There is not important "bandwidth" at total, but mainly latency between packets (these CPU can't really deal with 50-100Mbit of datas :) Because of enviroment...
    on Mar 13, 2011

  • Forum Post: LM3S1911 SSI Input rise/fall time requirement

    rperezti
    I'm looking for a spec of the input rise/fall time requirement for the SSIxFss signal of the LM3S1911. I see the spec highlighted in the table below, but it seems to apply to the switching characteristics of the SSI pins in output mode. Can some one confirm/correct me on this?
    on Jan 14, 2011

  • Forum Post: Stellaris LM3S9B96 SSI Speed

    Ralf Koester
    hallo together, When reading the docs Stellaris LM3S9B96 and the DSP TMS320F28335 I could learn much about SPI and SSI technologies. So we are examine at the moment to communicate between LM3S9B96 and a TMS320F28335 via SSI! First look in the datasheet of the Stellaris LM3S9B96 shows, that when...
    on Apr 6, 2011
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