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void main(void) { int idx = 0; int sample_data[512]; while (1) { sample_data [idx++] = P3IN & Ox0f. // .. }

void main(void) { int idx = 0; int sample_data[512]; while (1) { sample_data [idx++] = P3IN & Ox0f. // .. }

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Consider the following array declaration, written for a 16 bit processor

What is the maximum value that can be represented in a single element of the array? Show your work.

### Understanding the Code: Sampling Data from a Port This section of C code continuously samples data from a port and stores it in an array. Below is the detailed breakdown for better understanding. ### Code Breakdown ```c void main(void) { int idx = 0; int sample_data[512]; while(1) { sample_data[idx++] = P3IN & 0x0f; // . . . } } ``` ### Explanation #### 1. Main Function The code starts with the `main` function, which is the entry point of a C program. ```c void main(void) { ``` #### 2. Variable Declarations Within the `main` function, two variables are declared: ```c int idx = 0; // An integer index initialized to 0. int sample_data[512]; // An array of 512 integers to store sampled data. ``` #### 3. Infinite Loop The `while` loop runs indefinitely as specified by `while(1)`, representing an infinite loop. ```c while(1) { ``` #### 4. Sampling Data Inside the loop, the code reads data from a port (presumably an input port named `P3IN`), masks the lower 4 bits using the `& 0x0f` operation, and stores the result in the `sample_data` array at the current index. The index (`idx`) is then incremented. ```c sample_data[idx++] = P3IN & 0x0f; ``` ### Additional Comments The `// . . .` indicates that there might be additional code following the data sampling operation. #### Represented Elements: - **P3IN**: This likely represents an input from hardware, possibly a microcontroller's port. - **0x0f**: This is a hexadecimal constant used to mask (clear) all but the lowest four bits of the input data. ### Usage in Educational Context Understanding this code is essential for students learning about embedded systems, where data is frequently sampled from hardware ports and stored for processing. This example illustrates the basic mechanisms of data acquisition and handling in a microcontroller or similar context.
Transcribed Image Text:### Understanding the Code: Sampling Data from a Port This section of C code continuously samples data from a port and stores it in an array. Below is the detailed breakdown for better understanding. ### Code Breakdown ```c void main(void) { int idx = 0; int sample_data[512]; while(1) { sample_data[idx++] = P3IN & 0x0f; // . . . } } ``` ### Explanation #### 1. Main Function The code starts with the `main` function, which is the entry point of a C program. ```c void main(void) { ``` #### 2. Variable Declarations Within the `main` function, two variables are declared: ```c int idx = 0; // An integer index initialized to 0. int sample_data[512]; // An array of 512 integers to store sampled data. ``` #### 3. Infinite Loop The `while` loop runs indefinitely as specified by `while(1)`, representing an infinite loop. ```c while(1) { ``` #### 4. Sampling Data Inside the loop, the code reads data from a port (presumably an input port named `P3IN`), masks the lower 4 bits using the `& 0x0f` operation, and stores the result in the `sample_data` array at the current index. The index (`idx`) is then incremented. ```c sample_data[idx++] = P3IN & 0x0f; ``` ### Additional Comments The `// . . .` indicates that there might be additional code following the data sampling operation. #### Represented Elements: - **P3IN**: This likely represents an input from hardware, possibly a microcontroller's port. - **0x0f**: This is a hexadecimal constant used to mask (clear) all but the lowest four bits of the input data. ### Usage in Educational Context Understanding this code is essential for students learning about embedded systems, where data is frequently sampled from hardware ports and stored for processing. This example illustrates the basic mechanisms of data acquisition and handling in a microcontroller or similar context.
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