Arduino/C3/Mixing-Assembly-and-C-programming/English-timed
| Time | Narration |
| 00:01 | Welcome to the Spoken Tutorial on Mixing Assembly and C programming. |
| 00:07 | In this tutorial, we will learn to:
Write a function in Assembly routine to perform initialisation. Call that Assembly routine in AVR-GCC program to blink the Dot LED of the Seven Segment display. |
| 00:24 | To follow this tutorial, you should have basic knowledge of :
Electronics AVR-GCC and Assembly Programming |
| 00:37 | To record this tutorial, I am using:
Arduino UNO Board and Ubuntu Linux operating system version 14.04 |
| 00:50 | We also require some external devices such as:
Breadboard Seven-Segment Display |
| 01:00 | 220 ohm Resistor
Arduino UNO Board and Jumper Wires |
| 01:09 | The Dot pin of the Seven Segment Display is connected to the pin 13 of the Arduino. |
| 01:16 | Any one of the common pins is connected to the +5Volts through a resistor. |
| 01:23 | This is the live setup of the connection. |
| 01:28 | Now we will write an Assembly routine to perform the initialisation. |
| 01:34 | Open any text editor and type the following. |
| 01:38 | This assembly routine program initialises and sets pin 13 of Arduino as output. |
| 01:45 | Let me explain the code line by line.
This line sets the Special Function Register offset to zero. |
| 01:54 | These two lines make this assembly routine globally accessible.
It enables other programs to use it. |
| 02:03 | Here init is the subroutine name.
These two lines sets pin 13 of Arduino as output. |
| 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. |
| 02:27 | All codes used in this tutorial are available in the Code Files link of this tutorial.
You can download and use it. |
| 02:37 | Now we will write an AVR-GCC program to call this subroutine and blink the Dot LED. |
| 02:45 | Open any text editor and type the following. |
| 02:49 | This code will blink the Dot LED continuously. |
| 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. |
| 03:08 | Save the code as blink.c in the Downloads folder. |
| 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. |
| 03:24 | I’ll open the Makefile in text editor. |
| 03:28 | Note that this Makefile is different from the one previously used. |
| 03:34 | In the Makefile, ensure that “TARGET = blink” and ASRC = “initasm.S” |
| 03:44 | Here “blink” is the main program and “initasm” is the subroutine. |
| 03:50 | You need to change the filename and subroutine name if you have given a different name.
Then save the Makefile. |
| 03:59 | Switch to the terminal. |
| 04:02 | Go to the folder where blink.c file is saved.
Type, make space FNAME in capital =blink and press Enter. |
| 04:17 | Now you can see that the Dot LED is blinking. |
| 04:22 | This brings us to the end of this tutorial. Let us summarize. |
| 04:28 | In this tutorial, we learnt to:
Write a function in Assembly routine to perform initialisation and Call that Assembly routine in AVR-GCC program to blink the Dot LED. |
| 04:43 | As an assignment-
Change the above program to increase the delay. Observe the delay in the blinking of the Dot LED |
| 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. |
| 05:11 | Please post your timed queries in this forum. |
| 05:15 | Spoken Tutorial project is funded by NMEICT, MHRD, Government of India.More information on this mission is available at this link. |
| 05:26 | This tutorial has been contributed by FOSSEE and Spoken Tutorial Project, IIT Bombay.This is Priya from IIT Bombay. Thanks for watching. |
