Flashcards
mbed_exam_p2
Cards in this deck (12)
- 1List three benefits that the usage of functions can have on the code and/or program development.- Code has become reusable
- Code has become clean and efficient
-Code has become more readable
- We have separated the what from the how.
-We enabled for splitting tasks - 2Describe the difference between the following three types of documentation: • Code documentation (code comments)• Code documentation (code comments):
- short, phrases used to explain specific tasks within a program. - 3Describe the difference between the following three types of documentation: • Application documentation• Application documentation
- ex. flow charts & state diagrams
- describes the use of function
- to indicate the operation of program flow - 4Describe the difference between the following three types of documentation: • API documentation• API documentation:
- Separating the what from the how
- Should document the what
- Users should not need to understand (or even open) your library code to be able to use it. - 5Assume that a temperature sensor is connected to the ADC of a MCU. The sensor outputs a voltage of 0.75 V at 25 ◦C. (a) What is the digital representation the ADC outputs if it has a resolution of 10 bit, a reference voltage of 3 V and it rounds to the closest integer?Svar: n= 256
- 6Assume that a temperature sensor is connected to the ADC of a MCU. The sensor outputs a voltage of 0.75 V at 25 ◦C. (b) What is the minimum resolution the ADC should have in order to have a quantiza- tion error of not more than 5 mV?
- 7The AnalogIn class provides two different functions in order to read from the ADC (read, read_u16) (a) Describe the difference of the two functions by describing their return values.Read: Read the input voltage, represented as a float in the range (0.0-1.0)
Read_u16: Read the input voltage, represented as an unsigned short in the range (0x0-0xFFFF) - 8The AnalogIn class provides two different functions in order to read from the ADC (read, read_u16) (b) In what relationship do the two functions stand?Both reads the input voltage but have different representation
- 9A 1 MHz clock signal is connected to a 16 bit counter. After the counter has reached its maximum value, the counter starts counting from 0 again. How many times will the counter overflow in one minute?
- 10What is an ISR?Interrupt Service Routines: A signal to the processor emitted by hardware or software indicating an event that needs immediate attention. ISR tells the processor what to do when the interrupt occurs.
- 11For every interrupt source, an interrupt flag exists in some register. (a) What is the interrupt flag used for?Usually a single bit in register, which records the fact that an interrupt has occurred.
- 12For every interrupt source, an interrupt flag exists in some register. (b) Explain what happens if the interrupt flag is not cleared in the callback function of the interrupt?- If the interrupt it not enabled it will be no respons.
- Depending on priority it can block other programs or let other programs through
- The program might later enable that interrupt or poll the interrupt flag
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- Flashcards on mbed_exam_p2, created by Charlotte Gonzalex on 13/01/2020.
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- Charlotte Gonzalex
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