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POBeaglebone Black Serial c++
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copied!<p>It seems to be a pain to get serial working in c++, adding to that, to do it on the Beaglebone Black is hard, so I need someone with some expertise!</p> <p>I created /dev/ttyO4 with the following command:</p> <pre><code>echo BB-UART4 > /sys/devices/bone_capemgr.9/slots </code></pre> <p>This gives me /dev/ttyO4. I then write a small program in cpp using a library linked <a href="http://serialib.free.fr/html/index.html" rel="nofollow">here</a>. My code is found below:</p> <pre><code>#include <stdio.h> #include "serialib.h" #if defined (_WIN32) || defined( _WIN64) #define DEVICE_PORT "COM1" // COM1 for windows #endif #ifdef __linux__ #define DEVICE_PORT "/dev/ttyO4" // ttyS0 for linux #endif int main() { serialib LS; // Object of the serialib class int Ret; // Used for return values char Buffer[128]; // Open serial port Ret=LS.Open(DEVICE_PORT,115200); // Open serial link at 115200 bauds if (Ret!=1) { // If an error occured... printf ("Error while opening port. Permission problem ?\n"); // ... display a message ... return Ret; // ... quit the application } printf ("Serial port opened successfully !\n"); // Write the AT command on the serial port Ret=LS.WriteString("AT\n"); // Send the command on the serial port if (Ret!=1) { // If the writting operation failed ... printf ("Error while writing data\n"); // ... display a message ... return Ret; // ... quit the application. } printf ("Write operation is successful \n"); // Read a string from the serial device Ret=LS.ReadString(Buffer,'\n',128,5000); // Read a maximum of 128 characters with a timeout of 5 seconds // The final character of the string must be a line feed ('\n') if (Ret>0) // If a string has been read from, print the string printf ("String read from serial port : %s",Buffer); else printf ("TimeOut reached. No data received !\n"); // If not, print a message. // Close the connection with the device LS.Close(); return 0; } </code></pre> <p>When I run the code, it says it opened the port successfully and successfully wrote serially, but I receive no data on the RX. I have connected the RX pin to the TX pin for UART4 (P9.11 and P9.13). I also connected the RX and TX pins for UART5 just incase (P8.37 and P8.38), as the ttyO4 confused me a bit as to which UART I'm using.</p> <p>Is there something I'm missing to get the serial port working? Or can someone refer me to a working example for serial communication with c++ on the beaglebone black, perhaps like a step-by-step guide?</p> <p>Regards, Cornel</p> <h2><strong>EDIT:</strong></h2> <p>The Boost serial libraries work more reliably than serialib, find them <a href="http://boost.org" rel="nofollow">here</a>.</p>

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