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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:
| + | 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 |
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| − | <syntaxhighlight lang="c">
| + | [http://books.socialledge.com/books/embedded-drivers-real-time-operating-systems/page/lab-assignment-freertos-tasks This article has been moved here] |
| − | // Create a task and run this code in a while(1) loop | |
| − | void task_one_code(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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| − | | |
| − | // Create another task and run this code in a while(1) loop | |
| − | void task_two_code(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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| − | | |
| − | <H3>Further Guidelines</H3>
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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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| − | | |
| − | <H3>Hints</H3>
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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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| − | | |
| − | <H3>Assignment</H3>
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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.
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Socialledge is moving to two portals.
