Analysis of C++ implementation skills of various functional modules in embedded system development

C Analysis of implementation skills of each functional module in embedded system development

Embedded system is a computer system in a specific application field, which is usually designed to to accomplish specific tasks. As a high-level programming language, C has object-oriented characteristics and has been widely used in the development of embedded systems. This article will explore the implementation techniques of C in embedded system development by analyzing different functional modules and providing corresponding code examples.

1. I/O control module
Embedded systems usually need to interact with external devices, such as sensors, actuators, etc. In C, I/O control can be achieved by using library functions. The following is a simple example that implements control of GPIO (General Purpose Input Output Port):

#include <iostream>
#include <wiringPi.h>

int main()
{
    int pin = 0;  // GPIO 引脚编号

    wiringPiSetup();  // 初始化 GPIO

    pinMode(pin, OUTPUT);  // 设置引脚为输出模式

    while (true)
    {
        digitalWrite(pin, HIGH);  // 输出高电平
        delay(1000);  // 延时 1s

        digitalWrite(pin, LOW);  // 输出低电平
        delay(1000);  // 延时 1s
    }
}

In the above example, the wiringPi library is used to control GPIO. First, use the wiringPiSetup() function to initialize the GPIO related settings. Then, use the pinMode() function to set the specified pin to output mode. Next, in an infinite loop, use the digitalWrite() function to control the level of the pin at 1 second intervals. In this way, control of GPIO can be achieved.

2. Interrupt processing module
In embedded systems, it is often necessary to respond to external events, such as buttons, timers, etc. In C, interrupt handlers can be used to handle interrupt events. The following is a simple example that demonstrates how to use the wiringPi library to handle GPIO interrupt events:

#include <iostream>
#include <wiringPi.h>

void myInterrupt()
{
    std::cout << "Button pressed!" << std::endl;
}

int main()
{
    int pin = 0;  // GPIO 引脚编号

    wiringPiSetup();  // 初始化 GPIO

    pinMode(pin, INPUT);  // 设置引脚为输入模式

    wiringPiISR(pin, INT_EDGE_BOTH, &myInterrupt);  // 注册中断处理函数

    while (true)
    {
        // 主循环执行其他任务
    }
}

In the above example, first use the wiringPiSetup() function to initialize the GPIO related set up. Then, use the pinMode() function to set the specified pin to input mode. Next, use the wiringPiISR() function to register the interrupt handler function and specify the conditions for interrupt triggering. In the interrupt handling function myInterrupt(), the corresponding response action can be performed. In this way, GPIO interrupt events can be processed.

3. Serial communication module
In embedded systems, serial communication with external devices is often required. In C, you can use the serial port library to implement serial port communication. The following is an example that implements serial port-based data sending and receiving:

#include <iostream>
#include <string>
#include <SerialPort.h>

int main()
{
    std::string portName = "/dev/ttyS0";  // 串口设备名称

    SerialPort serialPort(portName);  // 创建串口对象

    serialPort.Open();  // 打开串口

    std::string sendData = "Hello World!";  // 待发送的数据

    serialPort.Write(sendData);  // 发送数据

    std::string recvData = serialPort.Read();  // 接收数据

    std::cout << "Received data: " << recvData << std::endl;

    serialPort.Close();  // 关闭串口

    return 0;
}

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