View source for Arduino/C3/Mixing-Assembly-and-C-programming/English-timed

{| Border = 1
|'''Time'''
|'''Narration'''

|-
| 00:01
| Welcome to the''' Spoken Tutorial''' on''' Mixing Assembly and C programming.'''

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|00:07
|In this tutorial, we will learn to:

write a '''function''' in '''Assembly routine '''to perform initialization,

call that '''Assembly routine '''in '''AVR-GCC program '''to blink the '''Dot LED''' of the '''Seven Segment display.'''

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| 00:24
| To follow this tutorial, you should have basic knowledge of :

electronics,
 
'''AVR-GCC '''and

'''Assembly Programming.'''

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|00:37
|To record this tutorial, I am using:

'''Arduino UNO Board '''and
'''Ubuntu Linux operating system''' version 14.04.

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| 00:50
| We also require some external devices such as:

'''Breadboard''',

'''Seven-Segment Display''',

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| 01:00
|'''220 ohm Resistor''',

'''Arduino UNO Board '''and

'''Jumper Wires'''.

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| 01:09
| The '''Dot pin '''of the '''Seven Segment Display''' is connected to the '''pin 13''' of the '''Arduino'''. 

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| 01:16
|Any one of the '''common pins''' is connected to the '''+5 Volts''' through a '''resistor'''.

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| 01:23
| This is the live setup of the connection.

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| 01:28
| Now, we will write an '''Assembly routine''' to perform the initialization.

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| 01:34
| Open any '''text editor''' and type the following.

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| 01:38
| This '''assembly routine''' program initializes and sets '''pin 13 '''of '''Arduino '''as output.

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| 01:45
| Let me explain the code line by line.
This line sets the '''Special Function Register offset''' to zero.

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| 01:54
| These two lines make this '''assembly routine '''globally accessible. 
It enables other programs to use it.

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| 02:03
| Here, '''init''' is the '''subroutine '''name.
These two lines set '''pin 13 '''of '''Arduino '''as output.

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| 02:13
| '''Save''' the '''code''' as '''initasm.S '''in capital in the '''Downloads''' folder.
Since this is the '''subroutine''', it is saved as '''.S '''extension.

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| 02:27
| All codes used in this tutorial are available in the '''Code Files''' link of this tutorial. 
You can download and use it.

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|02:37
| Now, we will write an''' AVR-GCC program '''to call this '''subroutine '''and blink the '''Dot LED.'''

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| 02:45
| Open any text editor and type the following.

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| 02:49
| This code will blink the '''Dot LED '''continuously.

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| 02:54
| The first line,'''"init()" '''calls the '''Assembly subroutine'''. These lines of code alternatively turn the '''Dot LED '''ON and OFF causing it to blink.

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| 03:08
| Save the code as '''blink.c''' in the '''Downloads''' folder.

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| 03:13
| Download the '''Makefile '''from the '''code files '''link of this tutorial.
Place it in the same folder where '''blink.c''' file is saved.

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| 03:24
| I’ll open the '''Makefile '''in''' text editor.'''

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| 03:28
| Note that this '''Makefile''' is different from the one previously used.

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| 03:34
| In the '''Makefile''', ensure that '''“TARGET = blink”''' and '''ASRC = “initasm.S”'''.

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| 03:44
|Here, “'''blink'''” is the '''main '''program and “'''initasm'''” is the '''subroutine'''.

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| 03:50
|You need to change the '''filename''' and '''subroutine''' name if you have given a different name.
Then save the '''Makefile.'''

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| 03:59
| Switch to the '''terminal'''. 

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| 04:02
| Go to the folder where '''blink.c '''file is saved.
Type: '''make space FNAME in capital =blink '''and press '''Enter.'''

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| 04:17
| Now, you can see that the '''Dot LED '''is blinking.

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| 04:22
| This brings us to the end of this tutorial. Let us summarize.

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| 04:28
| In this tutorial, we learnt to:
write a '''function''' in '''Assembly routine '''to perform initialization and

call that '''Assembly routine '''in '''AVR-GCC program '''to blink the '''Dot LED'''.

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| 04:43
| As an assignment-
Change the above '''program '''to increase the '''delay'''.

Observe the '''delay '''in the blinking of the '''Dot LED'''

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| 04:53
| The video at the following link summarizes the '''Spoken Tutorial''' project. Please download and watch it.

|-
| 05:01
| The''' Spoken Tutorial Project''' team:
conducts workshops and gives certificates. For more details, please write to us.

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| 05:11
| Please post your timed queries in this forum.

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| 05:15
| Spoken Tutorial project is funded by '''NMEICT, MHRD''', Government of India. More information on this mission is available at this link.

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| 05:26
| This tutorial has been contributed by '''FOSSEE''' and '''Spoken Tutorial Project, IIT Bombay'''. This is Priya from '''IIT Bombay'''. Thanks for watching.

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