Arduino/C3/Assembly-programming-through-Arduino/English-timed

Time	Narration
00:01	Welcome to the spoken tutorial on Assembly programming through Arduino.
00:07	In this tutorial, we will learn to: Interface a seven-segment Display to Arduino board
00:15	Write an assembly program to display a digit on seven-segment display and
00:21	Display a digit on the seven segment display using 7447 IC.
00:28	To follow this tutorial, you should have basic knowledge of : Electronics and Assembly language
00:36	Refer to the Additional reading material link of this tutorial to know more about:
00:42	Arduino - Assembly code reference and Arduino ATmega328 Pin mapping.
00:50	To record this tutorial, I am using: Arduino UNO Board
00:56	And Ubuntu Linux operating system version 14.04
01:02	We also require some external devices such as: Breadboard
01:09	Arduino UNO Board
01:12	Common Anode Seven-Segment Display 220 ohm Resistor
01:18	Decoder 7447 IC And Jumper Wires
01:25	In this experiment we will use the common anode seven segment display.
01:31	Please refer to the basic level tutorial of this series to know more about seven segment display.
01:38	Let us see the connection circuit details.
01:46	The Dot pin of the Seven Segment Display is connected to the pin 13 of Arduino.
01:53	Any one of the COM pins is connected to the +5Volts through a 220 ohm resistor.
02:00	Refer the pin mapping for Arduino and microcontroller.
02:05	This is the live setup of the connection.
02:09	Now we will write an assembly program to turn on the Dot LED on the seven segment display.
02:17	We need to install an assembler AVRA and AVRDUDE.
02:23	AVRA is an assembler that will generate a hex file.
02:28	AVRDUDE is used to upload any hex file to the Arduino board.
02:34	Open the terminal by pressing Ctrl + Alt + T keys together.
02:39	To install avra and avrdude, type sudo space apt hyphen get space install space avra space avrdude
02:55	Enter the administrative password if prompted and press Enter.
03:01	We can see the installation process has begun.
03:05	Press 'Y' wherever there is a prompt during the installation, to confirm the configuration.
03:11	Installation will take some time to complete depending upon the internet speed.
03:17	We can see that the installation has been completed successfully. Let us clear the screen.
03:25	Now let us connect the Arduino board to the computer.
03:29	To check the port number of Arduino, I'll type ls space forward slash dev forward slash ttyACM asterisk
03:41	We can see the output as forward slash dev forward slash ttyACM0
03:49	Here ttyACM0 represents the port number of Arduino.
03:55	You may get a different port number. Make a note of your port number.
04:00	Download m328Pdef.inc file from the Code files link of this tutorial.
04:08	We need to include this library file in the first line of the source code.
04:13	This allows the user to use Register and Bit name when writing assembly programs.
04:20	Let us write an assembly program and upload it to the microcontroller.
04:25	Open any text editor and type the following.
04:29	Semicolon represents comment statements.
04:33	These statements are ignored by the assembler and are not executed.
04:38	This line tells the assembler to include the m328Pdef.inc file.
04:45	We had downloaded this file earlier and in my computer this is the path.
04:51	Note that we have to specify the entire file path.
04:55	ldi stands for "load immediate"
04:59	This sets pin PB5, that is digital pin 13 as output.
05:05	It tells the assembler to take a working register r16 and load a binary number into it.
05:12	This line tells the compiler to copy the contents of the register r16 into the DDRB register.
05:20	This sets all the pins to 0 volts except pin PB5, (i.e digital pin 13) which is set to 5 volts.
05:30	This line copies the same binary number from our storage register r17 to PortB.
05:38	Relative jump statement executes the program in an infinite loop.
05:44	The program has to just keep running, in order for the LED to remain ON.
05:50	Save the code as dot hyphen led.asm file in the home slash spoken slash Assembly folder.
05:59	This code is available in the Code files link of this tutorial, as well.
06:04	You can download and use it.
06:07	Switch to the terminal.
06:10	Go to the folder where dot hyphen led.asm file is saved.
06:16	Type, avra space dot hyphen led.asm and press Enter.
06:24	This will assemble the code and create a file dot hyphen led.hex.
06:30	Let us see the dot hyphen led.hex file that is generated in the same folder.
06:37	Next we need to upload the code to Arduino.
06:41	Switch back to the terminal.
06:44	For this, type avrdude space hyphen p space atmega328p space hyphen c arduino space hyphen b space 115200 space hyphen capital P space forward slash dev forward slash ttyACM0 space hyphen capital U space flash colon w colon dot hyphen led dot hex
07:16	Here ttyACM0 represents the port number of Arduino.
07:22	dot hyphen led.hex is the file that is generated. And press Enter.
07:30	Now you can see that the Dot LED in the seven segment is glowing.
07:36	Pause the tutorial and do the below assignment. Modify the same code to turn off the Dot LED.
07:44	Next, we will display the digit 2 on the seven segment display.
07:49	To display '2', a,b,d,e,g segments should be high and the other LEDS should be low.
07:58	Connect Pins a, b, c, d, e, f and g of the seven-segment display to pins 2, 3, 4, 5, 6, 7 and 8 of Arduino.
08:10	The two common pins are connected to positive 5Volts through resistors.
08:17	Let us see the live connection setup.
08:21	Let us see the source code for this program.
08:24	Open any text editor and type the following code.
08:28	As seen earlier, we should first configure the pins as output first.
08:34	Then make it as high or low according to our requirement.
08:39	These two lines makes the bits 2 to 7 on PORT D as output.
08:45	These two lines makes bit 0 on PORT B as output.
08:50	These bits corresponds to the digital pins 2 to 8 on Arduino.
08:56	Here, we are making the pins as high or low corresponding to whatever number we want to display.
09:04	In our case, it is digit two.
09:07	Here, we are writing 0100100 to digital pins 2 to 8 of Arduino.
09:16	This will make all the segments of SSD low, except c and g.
09:22	Let us save this as two.asm file.
09:27	Switch back to the terminal. Let us clear the screen.
09:33	Type, avra space two.asm and press Enter.
09:39	To upload, press the up arrow to get the previous command.
09:44	Now change the filename as shown and press Enter.
09:50	Now you can see that the digit 2 in the seven segment is glowing.
09:56	Pause the tutorial and do the below assignment. Modify the above code to display any other digit from 0 to 9.
10:06	Next, we will use a Decoder to display the number 5 on the Seven Segment Display.
10:12	We are using 7447 IC.
10:16	The a complement to f complement pins of the decoder connect to the a to f pins of Seven Segment Display.
10:25	Vcc and the Ground pins of the decoder are connected to positive 5Volts and the Ground pins of Arduino.
10:33	Connect the A, B,C,D pins of the Decoder to pins 2,3,4,5 of Arduino.
10:40	Note that this decoder is compatible only with common anode seven segment display.
10:47	Let us see the live connection setup.
10:51	The input pins of the decoder are A,B,C and D.
10:56	A being the lowest significant bit (LSB) and D being the most significant bit (MSB).
11:02	For example, the number 5 is visible on the display when the A,B,C and D inputs are as shown here.
11:10	Let us see the source code for this program.
11:13	Open any text editor and type the following code.
11:17	The first two lines makes the bits 2 to 5 on PORT D as output.
11:23	This means we are making digital pins 2 to 5 in Arduino as output pins.
11:29	2 to 5 pins in the Arduino are connected to A, B, C, D pins of decoder.
11:36	The next two lines are giving input of 0101 to decoder inputs.
11:43	This will then be decoded as 5 in the seven segment display.
11:48	Save it as decoder.asm file.
11:52	Switch back to the terminal.
11:55	Type, avra space decoder.asm and press Enter.
12:02	To upload, press the up arrow to get the previous command.
12:07	Now change the filename as shown and press Enter.
12:13	Now we can see that the digit five in the seven segment is glowing.
12:19	This brings us to the end of this tutorial. Let us summarize.
12:24	In this tutorial, we learnt to: Interface a Seven-segment Display to Arduino board and
12:31	Write an assembly program to display a digit on seven-segment display.
12:36	And Display a digit on the seven segment display using 7447 IC.
12:42	The video at the following link summarizes the Spoken Tutorial project. Please download and watch it.
12:50	The Spoken Tutorial Project Team: conducts workshops and gives certificates. For more details, please write to us.
12:58	Please post your timed queries in this forum.
13:02	Spoken Tutorial project is funded by NMEICT, MHRD, Government of India. More information on this mission is available at this link.
13:12	This tutorial has been contributed by FOSSEE and Spoken Tutorial Project, IIT Bombay. This is Priya from IIT Bombay signing off. Thanks for joining.

Contributors and Content Editors

PoojaMoolya, Sandhya.np14