UART Initialization Defaults

Question

Problem: UART Initialization Defaults. Solve this hands-on electronics task on EWskills.

Accepted Answer

#include 
using namespace std;
 
// baud is required
// parity default = 'N' (no parity)
// stopBits default = 1
void initUART(int baud, char parity = 'N', int stopBits = 1) {
    cout << baud << " " << parity << " " << stopBits;
}
 
int main() {
    int baud, mode;
    cin >> baud >> mode;
 
    if (mode == 0) {
        // only baud given, use both default parameters
        initUART(baud);
    } else if (mode == 1) {
        char parity;
        cin >> parity;
        // custom parity, default stop bits
        initUART(baud, parity);
    } else if (mode == 2) {
        char parity;
        int stopBits;
        cin >> parity >> stopBits;
        // custom parity and stop bits
        initUART(baud, parity, stopBits);
    }
 
    return 0;
}

Explanation & Logic Summary:

Default arguments allow you to call initUART with:
- only baud (uses 'N' and 1)
- baud + parity (uses default stopBits)
- or all parameters explicitly.
The defaults are specified in the function parameter list, so when arguments are omitted, those defaults are used automatically.
This reduces the need for multiple overloads while keeping the API flexible.

Firmware Relevance & Real-World Context:

UART configuration in embedded systems often includes baud rate, parity, and stop bits.
Most applications use standard defaults (e.g., 9600 8N1), while some special cases override parity or stop bits.
Default arguments allow a clean, single function interface for both simple and advanced use cases.
This pattern mirrors real HAL APIs, where typical settings are easy to call, but full control is still available when needed.

16. UART Initialization Defaults