Stellaris® ARM® Microcontrollers

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SPI
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  • 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: Re: Wifi Support for Stellaris

    Andy Neil
    jan which means you can only interface SD cards in SPI mode. No, it doesn't (necessarily) mean that; it just means that you would have to implement the SDIO "manually" on some GPIOs. However, if the use of SDIO really is central to your project, it would certainly make sense to pick...
    on Jun 9, 2010

  • Forum Post: Re: Logging at SD card

    Andy Neil
    Cesar Ofuchi Can I use the Fatfs not using serial commands Yes, of course you can: FatFs provides a set of function calls for doing file operations - you just call them direct, instead of from the serial command interpreter! You can follow the example of the serial command interpreter to see how...
    on Jun 15, 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: E2S and SPI

    KMJ
    I would like to know if it's possible to use the Serial-to-Ethernet kit to access a SPI device, in the same way it can provide remote access over ethernet to RS232 devices? I guess using com0com and com2tcp on the PC side, or is something else required? It seem doable, but it had been nice...
    on Jul 1, 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: Can LM3S9B96 implement 4bit SD Interface and achieve high data rates?

    Andy Neil
    Ilan Can EPI GPIO be used to read SD data faster than through SPI? IIRC, the protocol on the SDIO 4-bit interface is not the same as on the SPI interface - so it's not just a matter of swapping the same code from SPI to SDIO... Having said that, a parallel interface inherently has the potential...
    on Aug 18, 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: Boot loader and SPI Flash

    marco repetto
    I'm try to use LM3s9B96 for a project where I'd like to upgrade the firmware from a remote source through a UART for example. I thought to use a Flash external memory with SPI interface where memorizing the file received and the Bootloader software present in ROM to load the new firmware from...
    on Oct 21, 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: 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: 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: Need help on SimpliciTI zigbee cc2520 interface with lm3s1968

    kudiarasu
    Hi Dave, Thanks for replay, we are using our own baord of lm3s1968, so we are not using the OLED display . I tried to trace through oscilloscope SSI_CLK and SSI_SI is fine but i am not able get data from SSI_SO i attached the images of oscilloscope screen shot for your reference 1. image 1 SSI_CLK...
    on Dec 15, 2010

  • Forum Post: LM3S5956 SSI questions

    Igor56492
    Hello guys, I have a few questions regarding the SSI operation on hte Stellairs with DMA module. 1. While running with 80 MHz M3, I was trying to configure SSI module to run on the 20 MHz baud rate. What was observed is that the sampling edge of SSI module is rising edge of the clock as in SSI_FRF_MOTO_MODE_1...
    on Dec 13, 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: GPIO Problems using SPI Bus

    Justin Wilkerson
    Im using a Stellaris Cortex M3 USB development board with uController LM3S3748 to interface to an external memory chip using the SPI bus. The problem is that the GPIO pin i am using as a 'chip select' will not produce a voltage. I have followed the example code from Application Note AN01243 "Adding...
    on Feb 5, 2011

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

    Andy Neil
    Guy Langlois Why do we call three times the same function "SysCtlPeripheralEnable" with the same argument : SDC_GPIO_SYSCTL_PERIPH = SDCARD_CS_PERIPH = SFLASH_CS_PERIPH = SYSCTL_PERIPH_GPIOA ? Probably because it's a generic piece of code used across several different boards - where...
    on Feb 22, 2011

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

    Guy Langlois
    Thank you Andy for your quick answer. Andy Neil Guy Langlois Why do we call three times the same function "SysCtlPeripheralEnable" with the same argument : SDC_GPIO_SYSCTL_PERIPH = SDCARD_CS_PERIPH = SFLASH_CS_PERIPH = SYSCTL_PERIPH_GPIOA ? Probably because it's a generic piece of code...
    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: 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

  • 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: Re: Regarding Secure Digital Memory Card Physical Layer Specification version for LM3S6911

    Andy Neil
    Stellaris processors have no specific support for SD Cards - they just use the SPI mode of the Synchronous Serial Interface (SSI) peripheral . The performance characteristics of the SSI peripheral are given in the Datasheet - it's up to you to see how they correspond to the "Speed Classes"...
    on May 24, 2011

  • Forum Post: SPI Interface to external EEPROM

    Alan Neidig
    Looking to add external SPI EEPROM to devices with Ethernet. Larger EEPROMs require 24-bit address. Checked Peripheral Library Users Guide. Noticed ulDataWidth is limited to 16-bits. Any suggestions (or reference code) to support large external SPI EEPROMs? Alan
    on Jun 17, 2011

  • Forum Post: LM3S811 control of an ADS8508 16 bit ADC, via the SPI port.

    Earl Morris
    I am failing in my effort to enable a LM3S811 to control an ADS8508 (EVM) 16 bit ADC, via the SPI port. The object is to trigger and take a reading from the ADC, as required under program control. I am using CCS Ver: 4.2.3.00004 and the Stellaris® Peripheral Driver Library. Here are the hardware...
    on Jun 27, 2011
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