How to use C++ language to develop motor control and drive functions of embedded systems

How to use C language to develop the motor control and drive functions of embedded systems

Embedded systems have been widely used in various industries, especially in the field of motor control and drive plays an important role in. As a high-level programming language, C provides a wealth of features and functions, making it easier for developers to develop motor control and drive functions for embedded systems.

This article will introduce in detail how to use C language to develop the motor control and drive functions of embedded systems, and provide code examples.

1. Hardware connection

Before developing the motor control and drive functions of the embedded system, it is necessary to connect the motor and the control circuit. Normally, a motor drive module is used to connect the control circuit and the motor, and then controlled through the IO port of the embedded development board.

2. Design of C class

In order to better organize the code and implement functions, we can create a C class named Motor to encapsulate motor control-related functions and data.

The following is a code example of the Motor class:

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

class Motor {
public:
    Motor(int pin1, int pin2, int pwm);

    void setSpeed(int speed);
    void forward();
    void backward();
    void stop();

private:
    int pin1, pin2, pwm;

    void digitalWrite(int pin, int value);
};

Motor::Motor(int pin1, int pin2, int pwm) {
    this->pin1 = pin1;
    this->pin2 = pin2;
    this->pwm = pwm;

    wiringPiSetup();

    pinMode(pin1, OUTPUT);
    pinMode(pin2, OUTPUT);
    pinMode(pwm, OUTPUT);
}

void Motor::setSpeed(int speed) {
    softPwmWrite(pwm, speed);
}

void Motor::forward() {
    digitalWrite(pin1, HIGH);
    digitalWrite(pin2, LOW);
}

void Motor::backward() {
    digitalWrite(pin1, LOW);
    digitalWrite(pin2, HIGH);
}

void Motor::stop() {
    digitalWrite(pin1, LOW);
    digitalWrite(pin2, LOW);
}

void Motor::digitalWrite(int pin, int value) {
    if (value == HIGH) {
        digitalWrite(pin, HIGH);
        delay(10);
        digitalWrite(pin, LOW);
    } else if (value == LOW) {
        digitalWrite(pin, LOW);
        delay(10);
        digitalWrite(pin, HIGH);
    }
}

int main() {
    Motor motor(0, 1, 2);

    motor.setSpeed(200);
    motor.forward();
    delay(2000);
    motor.stop();

    return 0;
}

3. Sample code explanation

The above example code encapsulates the motor control-related functions through the Motor class functions and data. In the constructor of the Motor class, initialize the wiringPi library through wiringPiSetup(), and call the pinMode function to set the input and output mode of the pin.

In the member functions of the Motor class, the setSpeed ​​function is used to set the duty cycle of the PWM, the forward function is used to make the motor rotate forward, the backward function is used to make the motor reverse, and the stop function is used to stop the motor.

In the main function of the sample code, first create a Motor object, then set the PWM duty cycle to 200 through the setSpeed ​​function, use the forward function to make the motor rotate forward, and after a delay of 2000 milliseconds, use the stop function Stop the motor.

4. Summary

This article introduces how to use C language to develop the motor control and drive functions of embedded systems, and provides code examples for illustration. By encapsulating motor control-related code into the Motor class, the code is made clearer and easier to read, and developers can more conveniently use C language to develop motor control and drive functions. Of course, the implementation of specific motor control and drive functions still needs to be adjusted and optimized based on specific hardware and requirements.

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