136 lines
5.6 KiB
HTML
136 lines
5.6 KiB
HTML
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<title>EdgeTriggeredInt</title>
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<body style="background-color: white;" alink="#0000ff" lang="EN-US"
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link="blue" vlink="#c40026">
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<div class="WordSection1">
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<p style="text-align: center;" align="center"><span
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style="font-size: 18pt;">EdgeTriggeredInt</span><br>
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<table class="MsoNormalTable"
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style="border: 3pt outset ; background: rgb(255, 204, 153) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial; width: 100%;"
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border="1" cellpadding="0" width="100%">
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<tr>
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<td>
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<p><b><span style="font-size: 18pt;">Readme</b></span>
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<br> <br>
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This is a C language project that demonstrates
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edge triggered interrupts.
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An interrupt is invoked on falling edge of S3 (PB21).
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When S3 is touched (falling edge) the red LED (PB26) is toggled.
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The green LED (PB27) is toggled in the main program.
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The <b>DOUTTGL31_0</b> register is used so the code is thread-safe.
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Build, debug, run the project. <br> <br>
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In the following figure, the falling edge of PB21 triggers
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the interrupt.
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Notice the toggling on PB27 stops while
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the interrupt is serviced. The toggle on PB26 occurs
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within the ISR. The entire ISR requires about 2us to run.</p>
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<p class="PictureWide"><span lang="en-US"><img src="EdgeTriggeredInt.png"
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></span></p>
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<p>
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Derived from Texas Instrument code
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<ul>
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<li>gpio_input_capture_LP_MSPM0G3507_nortos_ticlang</li>
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<li>gpio_toggle_output_LP_MSPM0G3507_nortos_ticlang</li>
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</ul>
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</p>
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</tr>
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</table>
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<table class="MsoNormalTable"
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style="border: 3pt outset ; background: rgb(252, 243, 144) none repeat scroll 0% 50%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: initial; width: 100%;"
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border="1" cellpadding="0" width="100%">
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<tbody>
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<tr>
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<td>
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<p><b><span style="font-size: 18pt;">Hardware Required</b></span>
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<br>
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<ul>
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<li>MSPM0G3507 LaunchPad™ Development Kit (LP-MSPM0G3507)</li>
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</ul>
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<b><span style="font-size: 18pt;">Pin assignments</b></span>
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<br>
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<ul>
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<li>Output: PB22 is blue LED2, index 49 in IOMUX PINCM table</li>
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<li>Output: PB26 is red LED2, index 56 in IOMUX PINCM table</li>
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<li>Output: PB27 is green LED2, index 57 in IOMUX PINCM table</li>
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<li>Input: PA18 is S2 positive logic switch, index 39 in IOMUX PINCM table</li>
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<li>Input: PB21 is S3 negative logic switch, index 48 in IOMUX PINCM table</li>
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</ul>
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<b><span style="font-size: 18pt;">LaunchPad Jumpers</b></span>
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<br>
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<ul>
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<li>Remove J16 J17 J18: Disconnects light sensor from the microcontroller PA22 PA27 PA26</li>
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<li>J5: Connects PB22 to blue LED2</li>
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<li>J6: Connects PB26 to red LED2</li>
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<li>J7: Connects PB27 to green LED2</li>
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</ul>
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</p> </td>
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</tr>
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</tbody>
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</table>
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</body>
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</html>
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<p>
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Simplified BSD License (FreeBSD License)
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Copyright © 2025, Jonathan Valvano, All rights reserved.<br>
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<br>
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:<br>
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<ol>
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<li>Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.</li>
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<li>Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.</li></ol>
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.<br>
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<br>
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The views and conclusions contained in the software and documentation are
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those of the authors and should not be interpreted as representing official
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policies, either expressed or implied, of the FreeBSD Project.
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<br>
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</p>
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<p>For more information, see <a href="http://users.ece.utexas.edu/~valvano/">
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http://users.ece.utexas.edu/~valvano/</a>.
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</p>
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