C++與Arduino的libserial串行連接

Question

我試圖通過串行連接（USB）從我的PC（Ubuntu 14.04）發送數據到Arduino Uno。 Arduino應該顯示接收到的數據用於測試目的。 （我很高興，如果我收到什麼......）

我使用libserial發送數據，但Arduino沒有收到任何東西。在Arduino IDE的幫助下，我可以成功地將數據發送給Arduino。使用正常的控制檯命令也可以發送數據。

這裏是我的Arduino代碼：

#include <LiquidCrystal.h> 
#include <SoftwareSerial.h> 

// initialize the library with the numbers of the interface pins 
LiquidCrystal lcd(12, 11, 5, 4, 3, 2); 

String inputString = "";   // a string to hold incoming data 
boolean stringComplete = false; // whether the string is complete 

void setup() { 
    // set up the LCD's number of columns and rows: 
    lcd.begin(16, 2); 
    // Print a message to the LCD. 
    lcd.print("connecting..."); 

    inputString.reserve(200); 

    Serial.begin(9600); 
    while (!Serial) { 
    ; // wait for serial port to connect. Needed for native USB port only 
    } 

    lcd.setCursor(0, 0); 
    lcd.print("successful connected"); 

} 

void loop() { 
    lcd.setCursor(0, 1); 

    // print the string when a newline arrives: 

    lcd.setCursor(0, 1); 
    lcd.print("    "); 

    lcd.setCursor(0, 1); 
    lcd.print(inputString); 

    delay(500); 
} 

void serialEvent() { 

    if (Serial.available()) { 
    // get the new byte: 
    char inChar = (char)Serial.read(); 
    // add it to the inputString: 
    inputString += inChar; 
    } 
} 

而這個C++代碼（PC端）：

//Libserial: sudo apt-get install libserial-dev 
#include <SerialStream.h> 
#include <iostream> 
#include <unistd.h> 

using namespace LibSerial; 
using namespace std; 

int main(int argc, char** argv) 
{ 
    SerialStream my_serial_stream; 
    // 
    // Open the serial port for communication. 
    // 
    my_serial_stream.Open("/dev/ttyACM0"); 

    my_serial_stream.SetBaudRate(SerialStreamBuf::BAUD_9600); 

    //my_serial_stream.SetVTime(1); 
    //my_serial_stream.SetVMin(0); 

    my_serial_stream.SetCharSize(SerialStreamBuf::CHAR_SIZE_8); 
    my_serial_stream.SetParity(SerialStreamBuf::PARITY_NONE); 
    my_serial_stream.SetFlowControl(SerialStreamBuf::FLOW_CONTROL_NONE); 
    my_serial_stream.SetNumOfStopBits(1); 

    int i = 0; 

    while(i<=5) { 

     usleep(1500000); 

     if (!my_serial_stream.good()) { 

      my_serial_stream << i << "\n" << endl; 
      cout << i << endl; 


     } 
     else { 

      cout << "serial is not good" << endl; 
     } 

     i++; 
    } 

    my_serial_stream.Close(); 

    cout << "ready" << endl; 


    return 0; 
} 

你有什麼想法，爲什麼這不起作用？

謝謝！

Answer 1

我找到了一個解決方案，如何通過串口（USB）與Arduino進行通信。我不使用libserial。

I（僅顯示，如果有一個新行）提高Arduino的代碼：

// include the library code: 
#include <LiquidCrystal.h> 
#include <SoftwareSerial.h> 

// initialize the library with the numbers of the interface pins 
LiquidCrystal lcd(12, 11, 5, 4, 3, 2); 

String inputString = "";   // a string to hold incoming data 
boolean stringComplete = false; // whether the string is complete 

void setup() { 
    // set up the LCD's number of columns and rows: 
    lcd.begin(16, 2); 
    // Print a message to the LCD. 
    lcd.print("connecting..."); 

    inputString.reserve(200); 

    Serial.begin(9600); 
    while (!Serial) { 
    ; // wait for serial port to connect. Needed for native USB port only 
    } 

    lcd.setCursor(0, 0); 
    lcd.print("successful connected"); 

} 

void loop() { 
    lcd.setCursor(0, 1); 

    if (stringComplete) { 
    // print the string when a newline arrives: 

    lcd.setCursor(0, 1); 
    lcd.print("    "); 

    lcd.setCursor(0, 1); 
    lcd.print(inputString); 

    inputString = ""; 
    stringComplete = false; 

    } 
} 

void serialEvent() { 

    if (Serial.available()) { 
    while (Serial.available()) { 
    // get the new byte: 
    char inChar = (char)Serial.read(); 
    // add it to the inputString: 
    inputString += inChar; 
    // if the incoming character is a newline, set a flag 
    // so the main loop can do something about it: 
    if (inChar == '\n') { 
     stringComplete = true; 
    } 
    } 
    } 
} 

C++代碼：

//to compile use: g++ serial_success.cpp -o serial -std=c++11 

//you might not need every inclusion 
#include <iostream> 
#include <unistd.h> 
#include <string> 

#include <stdio.h> // standard input/output functions 
#include <string.h> // string function definitions 
#include <unistd.h> // UNIX standard function definitions 
#include <fcntl.h> // File control definitions 
#include <errno.h> // Error number definitions 
#include <termios.h> // POSIX terminal control definitionss 
#include <time.h> // time calls 

using namespace std; 

#define BAUDRATE B9600 


int main(int argc, char** argv) 
{ 

    int fileDescriptor = open("/dev/ttyACM0", O_RDWR | O_NOCTTY); 

    struct termios newtio; 
    bzero(&newtio, sizeof(newtio)); 
    newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD; 

    // set to 8N1 
    newtio.c_cflag &= ~PARENB; 
    newtio.c_cflag &= ~CSTOPB; 
    newtio.c_cflag &= ~CSIZE; 
    newtio.c_cflag |= CS8; 

    newtio.c_iflag = IGNPAR; 

    // output mode to 
    //newtio.c_oflag = 0; 
    newtio.c_oflag |= OPOST; 

    /* set input mode (non-canonical, no echo,...) */ 
    newtio.c_lflag = 0; 

    newtio.c_cc[VTIME] = 10; /* inter-character timer 1 sec */ 
    newtio.c_cc[VMIN] = 0; /* blocking read disabled */ 

    tcflush(fileDescriptor, TCIFLUSH); 
    if (tcsetattr(fileDescriptor, TCSANOW, &newtio)) { 
     perror("could not set the serial settings!"); 
     return -99; 
    } 

    int i = 0; 
    string test = ">123,456,7890;"; 

    while(i < 10) { 

     usleep(100000); 

     string res = test + std::to_string(i) + "\n"; 
     long wrote = write(fileDescriptor, res.c_str(), sizeof(char)*res.size()); 

     cout << res << endl; 


     i++; 
    } 


    cout << "ready" << endl; 

    return 0; 
}