Preet at 23:03, 4 September 2013

2013-09-04T23:03:27Z

Preet at 16:48, 27 August 2012

2012-08-27T16:48:11Z

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== Introduction ==
This article will teach you:
* Write a simple program for the SJ One Board
* Output data from the Board Sensors
''' Please note that you need to read the [[Development Package]] article before following along this article.

== The MAIN Function ==
The main() function is the '''entry point''' of a program. A lot of things may happen before main(), but it would be usually abstracted away from the user.

[[File:tutorial_main_function.png|center|frame|Locate main.cpp in your project]]

=== Hello World ===
Your "Hello World" project consists of printf message, compiling, loading the program onto the board, and confirming that your message comes out as you intended it. Follow these steps:
# Open up Eclipse
# Open Hello World Sample Project
# Open up '''main.cpp''' (You could search for it using shortcut key Ctrl+Shift+R)
# Write your own printf outputting your favorite message: <code>printf("My own hello world!");</code>
# Compile & Load the program onto the Board
# Open COM Port in Hercules and press RESET on the board to view your <code>printf</code> message.

== Board Sensors ==
After you get a basic "Hello World" program working, you can now output various different sensor values.

Here are the sensors or devices of SJOne Board you can access:
* Acceleration Sensor ('''AS''')
* Temperature Sensor ('''TS''')
* Light Sensor ('''LS''')
* IR Sensor ('''IS''')
* 2-Digit 7-Segment Display('''LD''')
* 8 Board LEDs('''LE''')
* 8 Board Switches ('''SW''')

=== Output Sensor Data ===
To output sensor data, simply access the sensor device using the device name given between the parenthesis in the bullets above. In your main() function, you could type a device name followed by a . (period) to see the list of things you could do with a device. For example, you could type: "TS." and the Eclipse drop-down menu would show function calls you can make. We will use the <code>Ts.getValueAsString()</code> function call in the example below:

<syntaxhighlight lang="c">
int main()
{
printf("Hello World!");
while(1) {
printf("Temperature Sensor Reading: %s\n", TS.getValueAsString());
delay_ms(1000);
}
}
</syntaxhighlight>

← Older revision		Revision as of 23:03, 4 September 2013
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	# Compile & Load the program onto the Board		# Compile & Load the program onto the Board
	# Open COM Port in Hercules and press RESET on the board to view your <code>printf</code> message.		# Open COM Port in Hercules and press RESET on the board to view your <code>printf</code> message.
−
−	~~== Board Sensors ==~~
−	~~After you get a basic "Hello World" program working, you can now output various different sensor values.~~
−
−	~~Here are the sensors or devices of SJOne Board you can access:~~
−	* Acceleration Sensor ('''AS''')
−	* Temperature Sensor ('''TS''')
−	* Light Sensor ('''LS''')
−	* IR Sensor ('''IS''')
−	* 2-Digit 7-Segment Display('''LD''')
−	* 8 Board LEDs('''LE''')
−	* 8 Board Switches ('''SW''')
−
−	~~=== Output Sensor Data ===~~
−	To output sensor data, simply access the sensor device using the device name given between the parenthesis in the bullets above. In your main() function, you could type a device name followed by a . (period) to see the list of things you could do with a device. For example, you could type: "TS." and the Eclipse drop-down menu would show function calls you can make. We will use the <code>Ts.getValueAsString()</code> function call in the example below:
−
−	~~<syntaxhighlight lang="c">~~
−	~~int main()~~
−	{
−	~~printf("Hello World!");~~
−	~~while(1) {~~
−	~~printf("Temperature Sensor Reading: %s\n", TS.getValueAsString());~~
−	~~delay_ms(1000);~~
−	}
−	}
−	~~</syntaxhighlight>~~

2012 SJ One Hello World Sample Project - Revision history

Preet at 23:03, 4 September 2013

Preet at 16:48, 27 August 2012