Stellaris® ARM® Microcontrollers
Options
Helpful Stellaris® LM4F Series Links
  • LM4F Series
  • Stellaris PinMux Utility
  • Stellaris® LM4F120 LaunchPad
  • LM4F MCU Applications
  • LM4F MCU Video
  • ARM Cortex-M4F Whitepaper
  • Stellaris MCU Brochure
  • LM4F232 Eval Kit

    • Forums

    How to toggle GPIO pin ?

    • ringram2077
      Posted by
      on Dec 23 2006 12:36 PM
      Prodigy200 points
      What is the statement to toggle an output pin ? I know how to set a pin high and set a pin low but don't see how a toggle would work. I have seen where the ~ is used to flip the bit on the port. Is there a trick like that that can be used or must you do it the old fashion way ?? Using LM3S811 EVB.

      Thanks

      Post edited by: ringram2077, at: 2006/12/24 08:16
      Report Abuse
    • ringram2077
      Posted by
      on Dec 24 2006 09:51 AM
      Prodigy200 points
      This works and is pretty simple I suppose:

      Code:


           if(GPIOPinRead(GPIO_PORTC_BASE, Status_LED))  //toggle led
                GPIOPinWrite(GPIO_PORTC_BASE, Status_LED, 0); //set to zero
                else
                GPIOPinWrite(GPIO_PORTC_BASE, Status_LED, Status_LED);//set to one



      Report Abuse
    • orinem
      Posted by
      on Dec 24 2006 13:57 PM
      Intellectual470 points
      If you want to avoid the if, the following should do the trick:

      GPIOPinWrite(GPIO_PORTC_BASE,
      Status_LED,
      ~GPIOPinRead(GPIO_PORTC_BASE, Status_LED));

      Orin.
      Report Abuse
    • ringram2077
      Posted by
      on Dec 24 2006 21:06 PM
      Prodigy200 points
      That's the trick I was looking for !!!!!


      Thanks Orin
      Report Abuse

    All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.

    Content on this site may contain or be subject to specific guidelines or limitations on use. All postings and use of the content on this site are subject to the Terms of Use of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms of Use of this site. TI, its suppliers and providers of content reserve the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.

    TI Worldwide | Contact Us | my.TI Login | Site Map | Corporate Citizenship | mobile m.ti.com (Mobile Version)

    TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs and
    embedded processors, along with software, tools and the industry’s largest sales/support staff.

    © Copyright 1995-2013 Texas Instruments Incorporated. All rights reserved.
    Trademarks | Privacy Policy | Terms of Use