Embedded System Tutorial Tasks - Revision history

Sree at 19:55, 25 January 2019

2019-01-25T19:55:41Z

Sree at 17:07, 25 January 2019

2019-01-25T17:07:27Z

Preet at 06:13, 2 February 2018

2018-02-02T06:13:07Z

Preet at 21:45, 13 January 2018

2018-01-13T21:45:49Z

Preet at 16:59, 13 January 2018

2018-01-13T16:59:41Z

Preet at 16:58, 13 January 2018

2018-01-13T16:58:01Z

Preet: 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:
2018-01-13T16:57:25Z

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..."

New page
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="c">
void task_one(void)
{
uart0_puts("aaaaaaaaaaaaaaaaaaaa");
vTaskDelay(100);
}

void task_one(void)
{
uart0_puts("bbbbbbbbbbbbbbbbbbbb");
vTaskDelay(100);
}
</syntaxhighlight>

Further guidelines:
* Use FreeRTOS xTaskCreate() to create tasks and use example code for reference.
: You may have to take some things for granted, such as "stack size" and 2048 bytes is enough stack size to run these tasks
Use vTaskDelay() to "sleep"
* Do not use printf, instead use uart0_puts() function from #include "uart0_min.h"

Hints:
* The printf data appears over 38400bps UART, which can roughly send 4 characters per millisecond
: When you send 20 chars (aaaaaaaaaaaaaaaaaaaa), it would take roughly 5ms to send the data
The SJ-One board RTOS runs at 1Khz

Observe and turn in with your assignment:
* How come 4(or 3 sometimes) characters are printed from each task? Why not 2 or 5, or 6?
* Alter the priority of one of the tasks, and note down the observations. Note down WHAT you see and WHY.

Turn in (to Canvas):
# Relevant code
# Your observation and explanation
# Snapshot of the output for all scenarios.

← Older revision		Revision as of 19:55, 25 January 2019
Line 3:		Line 3:
	* The bookstack will now be used for SJSU assignments		* The bookstack will now be used for SJSU assignments

−	[http://books.socialledge.com/books/embedded-drivers-real-time-operating-systems/~~chapter~~/~~lesson~~-~~gpio~~ This article has been moved here]	+	[http://books.socialledge.com/books/embedded-drivers-real-time-operating-systems/page/lab-assignment-freertos-tasks This article has been moved here]

← Older revision		Revision as of 17:07, 25 January 2019
Line 3:		Line 3:
	* The bookstack will now be used for SJSU assignments		* The bookstack will now be used for SJSU assignments

−	[http://books.socialledge.com/books/embedded-drivers-real-time-operating-systems/~~page~~/~~lab~~-~~assignment-freertos-tasks~~ This article has been moved here]	+	[http://books.socialledge.com/books/embedded-drivers-real-time-operating-systems/chapter/lesson-gpio This article has been moved here]

← Older revision		Revision as of 06:13, 2 February 2018
Line 1:		Line 1:
−	~~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

−	~~<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)~~
−	{
−	~~uart0_puts("aaaaaaaaaaaaaaaaaaaa");~~
−	~~vTaskDelay(100);~~
−	}
−
−	// ~~Create another task and run this code in a while(1) loop~~
−	~~void task_two_code(void)~~
−	{
−	~~uart0_puts("bbbbbbbbbbbbbbbbbbbb");~~
−	~~vTaskDelay(100);~~
−	}
−	</~~syntaxhighlight>~~
−
−	~~<H3>Further Guidelines<~~/~~H3>~~
−	* Use FreeRTOS xTaskCreate() to create tasks and use example code for reference.
−	*: You may have to take some things for granted, such as "stack size" and 2048 bytes is enough stack size to run these tasks
−	* Use vTaskDelay() to "sleep"
−	* Do not use printf, instead use uart0_puts() function from #include "uart0_min.h"
−
−	~~<H3>Hints</H3>~~
−	* The printf data appears over 38400bps UART, which can roughly send 4 characters per millisecond
−	*: When you send 20 chars (aaaaaaaaaaaaaaaaaaaa), it would take roughly 5ms to send the data
−	* The SJ-~~One board RTOS runs at 1Khz~~
−
−	~~<H3>Assignment</H3>~~
−	~~Observe and turn in with your~~ assignment:
−	* How come 4(or 3 sometimes) characters are printed from each task? Why not 2 or 5, or 6?
−	* Alter the priority of one of the tasks~~, and note down the observations. Note down WHAT you see and WHY.~~
−
−	~~Turn in (to Canvas):~~
−	~~# Relevant code~~
−	~~# Your observation and explanation~~
−	~~# Snapshot of the output for all scenarios.~~

@@ Line 9: / Line 9: @@
+}
 void task_two_code(void)
+{

@@ Line 16: / Line 16: @@
 </syntaxhighlight>
-Further guidelines:
+<H3>Further Guidelines</H3>
 *  Use FreeRTOS xTaskCreate() to create tasks and use example code for reference.
 *:  You may have to take some things for granted, such as "stack size" and 2048 bytes is enough stack size to run these tasks
@@ Line 22: / Line 22: @@
 *  Do not use printf, instead use uart0_puts() function from #include "uart0_min.h"
-Hints:
+<H3>Hints</H3>
 *  The printf data appears over 38400bps UART, which can roughly send 4 characters per millisecond
 *:  When you send 20 chars (aaaaaaaaaaaaaaaaaaaa), it would take roughly 5ms to send the data
 *  The SJ-One board RTOS runs at 1Khz
 Observe and turn in with your assignment:
 *  How come 4(or 3 sometimes) characters are printed from each task?  Why not 2 or 5, or 6?

@@ Line 2: / Line 2: @@
 <syntaxhighlight lang="c">
-void task_one(void)
+// Create a task and run this code in a while(1) loop
+{
      uart0_puts("aaaaaaaaaaaaaaaaaaaa");
@@ Line 8: / Line 9: @@
+}
-void task_one(void)
+void task_two_code(void)
+{
      uart0_puts("bbbbbbbbbbbbbbbbbbbb");