15. Timer Prescaler Configuration

#include <iostream>
using namespace std;

// Default prescaler = 1
int configureTimer(int frequency, int prescaler = 1) {
    return frequency / prescaler;
}

int main() {
    int frequency, mode;
    cin >> frequency >> mode;

    if (mode == 0) {
        cout << configureTimer(frequency);
    } else {
        int prescaler;
        cin >> prescaler;
        cout << configureTimer(frequency, prescaler);
    }

    return 0;
}

Explanation & Logic Summary:

• Default arguments allow parameters to use predefined values when omitted.
• Calling configureTimer(frequency) automatically uses prescaler = 1.
• Providing a prescaler overrides the default.
• The effective frequency is calculated using integer division.

Firmware Relevance & Real-World Context:

• Hardware timers commonly divide a base clock using prescalers.
• Embedded HAL APIs often use default parameters to simplify common use cases.
• Default arguments reduce API clutter and avoid redundant overloads.