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| + | ====== Exercises | ||
| + | The goal is to write a program which is able to perform tasks described below. | ||
| + | |||
| + | ===== Warm up exercise ===== | ||
| + | |||
| + | * To the computer is sent a number with grows once in a second. The number must be in a form of text and end with a row changing sign (\n). | ||
| + | |||
| + | ===== For beginner ===== | ||
| + | |||
| + | - For the commands (letter signs) which are coming through RS-232 interface from a computer are being waited. Command “R” lights green LED, “K” lights yellow LED and “P” red LED. “R” is switching all LEDs off. | ||
| + | - If a button is pressed, the name of the corresponding button (S1, S2, S3) is received in the computer through the RS-232 interface. | ||
| + | |||
| + | ===== For advanced ===== | ||
| + | |||
| + | - The communication between two RS-232 controllers. If a button is pressed, the controller transmits to the controller the number of the button. When the number is received the status of a corresponding LED is changed. ' | ||
| + | - Make a “teletype” – device, which allows changing text messages between two controllers through RS-232 interface. Use LCD for displaying the messages. On the first row must be seen inserted message and on the second the last received message. For inserting the message a potentiometer and/or buttons may be used. | ||
| + | |||
| + | ====== Questions ====== | ||
| + | |||
| + | - Describe the UART package. | ||
| + | - What is the baud rate? | ||
| + | - What is the difference between full- and half duplexes. | ||
| + | - Find at least 5 different sensors which are using serial interface. | ||
| + | - What is the difference between UART and USART interfaces? Which is faster? | ||
| + | - How is the SPI interface working? | ||
| + | - Name interfaces, which enable connecting at least 100 devices to a single bus. | ||
| + | - Name different topologies and explain their differences. | ||
| + | - On what voltage level are RS-232 and UART connections happening? | ||
| + | - How long time takes to transmit 1 MiB at the baud rate of 9600 bps, when there is 8 data-bits, 1 stop-bit and not parity control? | ||
