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--- en:exercises:digi [2010/02/22 21:47] – Helen
+++ en:exercises:digi [2020/07/20 09:00] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-====== Digital i/o exercises ======
+====== Exercises ======
-The goal is to make a program witch is able to perform specified task.
+The goal is to write a program which is able to perform tasks described below.
 ===== Warm up exercise =====
-  *If pressing S1 it one LED is lighted, pressing S2 two LED-s and  S3 three LED-s.
+  *By pressing S1 one LED is lit, pressing S2 two LEDs and S3 three LEDs lit.
 ===== For beginners =====
-  - 1.	This simulates manually operated traffic light at pedestrian crossing. Until no button is pressed a green LED is lit for the cars. After pressing a random button the green LED will start to blink for 3 seconds, this is followed by lighting the yellow LED for 3 seconds and red for 10 seconds, after this sequence a green LED is lit again.
+  - This simulates manually operated traffic light at pedestrian crossing. Until no button is pressed a green LED is lit for the cars. After pressing a random button the green LED will start to blink for 3 seconds, this is followed by lighting the yellow LED for 3 seconds and red for 10 seconds, after this sequence a green LED is lit again.
-  - 2.	This counts how many times the button is pressed. Only the full release of the button will complete the pressing. The result is displayed in binary code on LEDs. Maximum result for three LEDs is 7(23-1). Green marks 1. bit, yellow 2. bit and red 3. bit.
+  - This counts how many times the button is pressed. Only the full release of the button will complete the pressing. The result is displayed in binary code on LEDs. Maximum result for three LEDs is 7(23-1). Green marks 1. bit, yellow 2. bit and red 3. bit.
-  - 3.	By pressing switch S1, LED1 and LED3 are lit; pressing S2 yellow LED is lit, pressing S3 all LEDs are switched off. This operation must be done by directly changing the values of corresponding registers (without using the library of the home lab).
+  - By pressing switch S1, LED1 and LED3 are lit; pressing S2 yellow LED is lit, pressing S3 all LEDs are switched off. This operation must be done by directly changing the values of corresponding registers (without using the library of the HomeLab).
-  - 4.	This counts how many times the button is pressed. The result is displayed by blinking of the LEDs. After each pressing the number of blinking is increased by one. A random button can be selected. In order for the LED to blink a sub function must be used, with parameters set on the number of blinks.
+  - This counts how many times the button is pressed. The result is displayed by blinking of the LEDs. After each pressing the number of blinking is increased by one. A random button can be selected. In order for the LED to blink a sub function must be used, with parameters set on the number of blinks.
-  - 5.	When pushing button S1, red LED will blink “SOS” in Morse. By pressing S2, yellow LED blinks “CQD” and by pressing S3, green will blink “OK”.
+  - When pushing button S1, red LED will blink “SOS” in Morse. By pressing S2, yellow LED blinks “CQD” and by pressing S3, green will blink “OK”.
 ===== For advanced =====
@@ Line 24: / Line 24: @@
 ===== Questions =====
-  - What is different between operations ”=” and ”==” ? Give two examples to prove that
+  - What is the difference between operations”=” and”==” ? Give two examples to verify the statement.
-  - What is different between operations “|” and “||”? Give two examples to prove that.
+  - What is the difference between operations “|” and “||”? Give two examples to verify the statement.
-  - Write an expression in witch you use equation “x = x + 1” twelve times.
+  - Write an expression using the equation “x = x + 1” twelve times.
-  - How an endless loop is written in C programming language?
+  - How an endless loop is written in C-programming language? Provide two different examples.
-  - What type of a variable do you choose is C – language to present positive numbers between 7 and 154?
+  - What type of a variable do you choose in C–language to present positive values between 7 and 154?
-  - Witch register determines the direction of a port? Give an example of a port setting input and output.
+  - Witch register determines the direction of a port? Provide an example of configuring settings of ports’ input and output.
-  - What methods can be used to prevent flickering? Give examples of methods using hardware and software.
+  - What are the methods for eliminating the bouncing of the contacts and the false connections caused by flickering? Provide examples of solutions using both hardware and software.
   - What is bit shift? Give a practical example with an explanation.
-  - For what are //pull-up//-resistors used by switches? How is their resistance determined?
+  - Why are pull-up resistors used in switches? How is their resistance determined?
   - Calculate the resistance for regulating LED current, the voltage is 5 V, forward voltage of the LED is 2,7 V and the current is 30 mA.

en/exercises/digi.1266875275.txt.gz · Last modified: 2020/07/20 09:00 (external edit)