Difference between revisions of "Embedded System Tutorial Tasks"

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(Created page with "The objective of the assignment is to create multiple tasks and observe how they behave. Please create two tasks, and have them run the following code: <syntaxhighlight lang...")
 
 
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The objective of the assignment is to create multiple tasks and observe how they behave.  Please create two tasks, and have them run the following code:
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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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<syntaxhighlight lang="c">
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[http://books.socialledge.com/books/embedded-drivers-real-time-operating-systems/page/lab-assignment-freertos-tasks This article has been moved here]
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void task_one(void)
 
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{
 
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    uart0_puts("aaaaaaaaaaaaaaaaaaaa");
 
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    vTaskDelay(100);
 
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}
 
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void task_one(void)
 
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{
 
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    uart0_puts("bbbbbbbbbbbbbbbbbbbb");
 
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    vTaskDelay(100);
 
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}
 
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</syntaxhighlight>
 
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Further guidelines:
 
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*  Use FreeRTOS xTaskCreate() to create tasks and use example code for reference.
 
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*:  You may have to take some things for granted, such as "stack size" and 2048 bytes is enough stack size to run these tasks
 
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*  Use vTaskDelay() to "sleep"
 
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*  Do not use printf, instead use uart0_puts() function from #include "uart0_min.h"
 
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Hints:
 
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*  The printf data appears over 38400bps UART, which can roughly send 4 characters per millisecond
 
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*:  When you send 20 chars (aaaaaaaaaaaaaaaaaaaa), it would take roughly 5ms to send the data
 
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*  The SJ-One board RTOS runs at 1Khz
 
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Observe and turn in with your assignment:
 
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*  How come 4(or 3 sometimes) characters are printed from each task?  Why not 2 or 5, or 6?
 
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*  Alter the priority of one of the tasks, and note down the observations.  Note down WHAT you see and WHY.
 
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Turn in (to Canvas):
 
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#  Relevant code
 
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#  Your observation and explanation
 
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#  Snapshot of the output for all scenarios.
 

Latest revision as of 19:55, 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

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