write « SerialPort « C Q&A

1. Issues writing to serial port on MAC OSX using unistd.h in c    stackoverflow.com

I am trying to write to a bluetooth device on MAC OSX using the unistd.h Linux functions in c. I am connecting fine and writing the first few bytes with success. ...

2. How to write on serial port ?    bytes.com

3. Reading and writing to serial port.    cboard.cprogramming.com

unsigned char chr; //pointer to file FILE* portfp ; //set system to connect to com port system(comsettings); //open port for write-read mode portfp = fopen(config.port, "wb+" ); //r+ //send first packet to com port fprintf(portfp, ini_val[pointer].data); fclose(portfp); //open port for read portfp = fopen(config.port, "rb" ); // portfp = fopen(config.port, "rb" ); //chr = 's'; printf("[%c]\n",chr); while(pointer

4. Serial port read/write problem    cboard.cprogramming.com

Hi all, I use the following code in order to read from a serial port based on the command I write there first. Code: write(*dev_fd,pwise_command,PWISE_COMMAND_SIZE); int p_devbytes = 1; while(p_devbytes) { FD_SET(*dev_fd,&fdsread); fdsreaduse = fdsread; q.tv_sec = 5; q.tv_usec = 0; sel_res = select((*dev_fd+1),&fdsreaduse,NULL,NULL,&q); if (sel_res == -1 || sel_res == 0) { break; } else if(FD_ISSET(*dev_fd,&fdsreaduse)) { memset(&p_devdata[0], 0, sizeof(p_devdata)); ...

5. Writing data to serial port    cboard.cprogramming.com

6. Reading and writing to a serial port    cboard.cprogramming.com

Reading and writing to a serial port Hi! I'm new here, but I've spent the last couple hours searching your archives, and this llooks like a really terrific forum!!!! I am working on a project that has my computer communicating with a microcontroller over an RS-232 connection. I've got the program on the microcontroller working flawlessly with minicom at 9600 8N1. ...

7. Unable to read or write from the serial port    forums.devshed.com

I am unable to read or write from the serial port.i want to receive a byte value from the device, performs the action and send the result back to the device. but none of this happenning. can anyone suggest any modifications required in the code below. The following code inputs a value from the serial port in the range 0-255. I ...

8. I need examples for read/write the serial port    forums.devshed.com

Hello! I'm not good with C++ and I'm in a big problem. I've to do a little program in C++ that it will be placed in a TomTom. The TomTom will be communicating with a Pc throught the serial port, and I don't know how can I start. Please, I need some help! The only thing that I know is the ...

9. between write and read:serial port.    daniweb.com

#include #include #include #include #include #include #include #include #include #include int main(int argc, char *argv[]) { char line[1024]; int chkin; char input[1024]; int file= open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY); if(file == 0) { perror("open_port: Unable to open /dev/ttyS0 - "); } else fcntl(file, F_SETFL, 0); while(1) { printf("enter input data:\n"); ...

10. Can read or write to serial port simultaneously    daniweb.com