📚 Assignment 2 CMPE1250: Hello C 👋

📋 Overview

In this ICA, you’ll create a project in the IDE, Segger Embedded Studio. Upon complition of this assignment, you should have learned to:

• Write some code in C
• Familiarize yourself with the debugger in the IDE
• Familiarize yourself with the debug terminal
• Determine the size of some of the common types in C on this platform
• Learn about C syntax and language constructs

1️⃣ Setup

Before starting:

• Ensure your Nucleo board is ready

• Install all required software

• Create a standard C project in Segger as discussed in class

• Structure your main function into:

  • One-time initializations
  • Infinite loop

• To submit your answers you must:

  • Create a markdown file(.md) with your answers and puload to your repository (add link to Brightspace).

2️⃣ Part A – Type Sizes

• Use sizeof and printf() to the debug terminalto determine the size of each type below.

• Ensure that you have included the header noted here so standard C types are available:

  #include <stdint.h>

• An example line of code that would show the size of type int to the debug console would look like this:

  printf("\r\nint : %d bytes", sizeof(int));

• Determine the size of the following types, record your findings here. Keep the code that you used to find these values - you will be submitting it.

Type	Verified Size (bytes)
int
float
double
short
long
long long
int64_t
int8_t
int *
void *

3️⃣ Part B – Bit Manipulation: Clear Bits

• In the ‘one-time inits’ section of your program, copy the following snippet of code, and complete it according to the comments.

// create a variable that will be modified by the following code
// initialize this variable with the provided test values and record
// the resultant values for each provided input (in hexadecimal)

    uint16_t testval = 0x1234;

// write the code necessary to clear the middle eight bits in testval,
// leaving the other bits unchanged

////////////////////
// Clear the middle 8 bits (bits 4-12)
////////////////////
// use the debugger to inspect the result of your operation, and validate
// that it did what was expected

Part B - Findings

Test Value	Observed Result (HEX)
0x1234	0x1004 (sample, expected)
0xF0F0
0xFFFF
0x0000
12345
8192
0b1110001110001110

4️⃣ Part C – Bit Manipulation: Set Bits

• In the ‘one-time inits’ section of your program, copy the following snippet of code, and complete it according to the comments.

// create a variable that will be modified by the following code
// initialize this variable with the provided test values and record
// the resultant values for each provided input (in hexadecimal)

    uint16_t testval = 0x1234;

// write the code necessary to set the most significant nibble in testval,
// leaving the other bits unchanged

////////////////////
// Set the most significant nibble (bits 12-15)
////////////////////

// use the debugger to inspect the result of your operation, and validate
// that it did what was expected

Part C - Findings

Test Value	Observed Result (HEX)
0x1234	0xF234 (sample, expected)
0xF0F0
0xFFFF
0x0000
12345
8192
0b1110001110001110

5️⃣ Part D – Print Binary

• In the ‘one-time inits’ section of your program, copy the following snippet of code, and complete it according to the comments.

// complete the following code so that it displays the value of Num16
// in the debug terminal as binary

    uint16_t Num16 = 42;

// something is missing in the code below - it just loops forever!
// use the debugger to determine what is not working correctly.
// fix it!

printf ("\r\n%4.4X : 0b", Num16);
for (uint16_t mask = 0x8000; mask; )
{
printf ("%c" ,(Num16 & mask) ? '1' : '0');
}

5️⃣ Part E – Count Set Bits

• In the ‘one-time inits’ section of your program, copy the following snippet of code, and complete it according to the comments.

// create a variable that will be used by the subsequent code

    uint16_t testval = 0x1234;

// write the code necessary to display (in the debug terminal)
// how many bits are set in the variable testval

////////////////////
// Count the number of set bits in testval
////////////////////

// use the debugger to help develop your code if necessary
// use the debug terminal to record the result