20553196
Description
Flashcards by Charlotte Gonzalex, updated more than 1 year ago
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Created by Charlotte Gonzalex
almost 5 years ago
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| Question | Answer |
| List 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 |
| Describe 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. |
| Describe 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 |
| Describe 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. |
| Assume 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 |
| Assume 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? | |
| The 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) |
| The 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 |
| A 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? | |
| What 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. |
| For 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. |
| For 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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