Difference between revisions of "Embedded System Tutorial File I/O"

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Socialledge is moving to two portals. 
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*  The Wiki will remain here for general references about the SJ-One board, and to document student reports.
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*  The bookstack will now be used for SJSU assignments
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[http://books.socialledge.com/books/embedded-drivers-real-time-operating-systems/chapter/lesson-watch-dogs This article has been moved here]
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In this project, we will attempt to "combine" all the FreeRTOS knowledge into a single assignment.
 
In this project, we will attempt to "combine" all the FreeRTOS knowledge into a single assignment.
  
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#  Create a '''<code>watchdog task</code>''' that monitors the operation of the two tasks.
 
#  Create a '''<code>watchdog task</code>''' that monitors the operation of the two tasks.
 
#*  Use high priority for this task.
 
#*  Use high priority for this task.
#*  Every sixty seconds, save the CPU usage info to a file named "cpu.txt".  See terminal command "infoHandler" for reference.  Open the file, write the file, and close it immediately so the data is immediately flushed.
 
 
#*  Use a timeout of 1 second, and wait for all the bits to set.  If there are two tasks, wait for bit1, and bit2 etc.
 
#*  Use a timeout of 1 second, and wait for all the bits to set.  If there are two tasks, wait for bit1, and bit2 etc.
 
#*  If you fail to detect the bits are set, that means that the other tasks did not reach the end of the loop.
 
#*  If you fail to detect the bits are set, that means that the other tasks did not reach the end of the loop.
 
#*  In the event of failed to detect the bits, append a file (stuck.txt) with the information about which task may be "stuck"
 
#*  In the event of failed to detect the bits, append a file (stuck.txt) with the information about which task may be "stuck"
 
#*  Open the file, append the data, and close the (stuck.txt) file to flush out the data immediately.
 
#*  Open the file, append the data, and close the (stuck.txt) file to flush out the data immediately.
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#*  Extra Credit: Every sixty seconds, save the CPU usage info to a file named "cpu.txt".  See terminal command "infoHandler" for reference.  Open the file, write the file, and close it immediately so the data is immediately flushed.
 
#  Create a terminal command to "suspend" and "resume" a task by name.
 
#  Create a terminal command to "suspend" and "resume" a task by name.
 
#*  "task suspend task1" should suspend a task named "task1"
 
#*  "task suspend task1" should suspend a task named "task1"
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What you created is a "software watchdog".  This means that in an event when a loop is stuck, or a task is frozen, you can save relevant information such that you can debug at a later time.
 
What you created is a "software watchdog".  This means that in an event when a loop is stuck, or a task is frozen, you can save relevant information such that you can debug at a later time.
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Latest revision as of 20:10, 25 January 2019

Socialledge is moving to two portals.

  • The Wiki will remain here for general references about the SJ-One board, and to document student reports.
  • The bookstack will now be used for SJSU assignments

This article has been moved here