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A case analysis of the application of various functional modules of C language in embedded systems
Abstract:
Embedded systems refer to the application of computer technology to various electronic A computer system in a device. The C language has become a commonly used language in embedded system development due to its rich functionality and flexibility. This article will be based on actual application cases, discuss the application of C language in various functional modules in embedded systems, and provide relevant code examples.
#include <iostream> #include <wiringPi.h> int main() { wiringPiSetupGpio(); pinMode(17, OUTPUT); while (true) { char cmd; std::cout << "请输入1(开)或0(关): "; std::cin >> cmd; if (cmd == '1') { digitalWrite(17, HIGH); } else if (cmd == '0') { digitalWrite(17, LOW); } else { std::cout << "输入无效,请重新输入!" << std::endl; } } return 0; }
The above code uses the wiringPi library to control the GPIO port output, and controls the on/off status of the LED light according to the commands entered by the user.
#include <iostream> #include <chrono> #include <thread> int main() { auto start = std::chrono::steady_clock::now(); while (true) { auto end = std::chrono::steady_clock::now(); auto duration = std::chrono::duration_cast<std::chrono::seconds>(end - start).count(); std::cout << "已经运行了" << duration << "秒!" << std::endl; std::this_thread::sleep_for(std::chrono::seconds(1)); } return 0; }
The above code uses the chrono library to calculate the running time of the program, and uses the sleep_for function of the thread library to achieve output every 1 second. . Through the timer function, various time-related functions can be realized, such as collecting data at regular intervals, sending data at regular intervals, etc.
#include <iostream> #include <wiringPi.h> #include <wiringSerial.h> int main() { int fd = serialOpen("/dev/ttyAMA0", 9600); if (fd == -1) { std::cout << "串口打开失败!" << std::endl; return -1; } while (true) { if (serialDataAvail(fd)) { char data = serialGetchar(fd); std::cout << "接收到的数据: " << data << std::endl; } } return 0; }
The above code uses the wiringSerial library for serial communication, opens the serial port through the serialOpen function, and uses the serialDataAvail function to determine whether the serial port has readable data. Get it and use the serialGetchar function to read the serial port data and output it. Through the application of the communication module, data interaction with other devices can be easily realized and various functions can be realized.
Conclusion:
This article takes the input/output module, timer module and communication module as examples to introduce the application of C language in various functional modules in embedded systems and provides relevant code examples. . C language has become a commonly used language in embedded system development due to its rich functionality and flexibility. By rationally applying each functional module, the functional requirements of various embedded systems can be easily realized.
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