Programing to read USB-GPS for SBC2440-IV Single Board Computer
I have an USB-GPS receiver (Haicom 204E) and a SBC2440-IV Single Board
Computer. I have also written a C program to read my GPS receiver on Unbutu 8.10 for testing. It has worked well. On my PC, I have created a file asserted for usb port by using command " $ sudo mknod /dev/ttyUSB0 c 188 0". so I"ve treated my device as a file named "/dev/ttyUSB0". However, on SBC2440-IV Single Board Computer, when I plug the GPS receiver in the USB host port1, I see a message on the terminal: "[root@arm-linux]# usb 1-1: new full speed USB device using s3c2410-ohci and address 2". then create /dev/ttyUSB0 file by using command "$ mknod /dev/ttyUSB0 c 188 0". I saw a file "ttyUSB0" in dev folder, but I can"t open it like the way on Unbutu. It"s seem to be that /dev/ttyUSB0 is not asserted for the USB host1. Could someone help me to read the GPS receiver on SBC2440-IV Single Board Computer? this is my C code to read the file. /*************************************************************************************/ int main(void) { int status,n; char *port = "/dev/ttyUSB0"; printf("GPS receiver\n"); open_port (port); configure_port(1); pthread_create(&GPS_READ_ID, NULL, GPSreceiver, 0); pthread_create(&GPS_SHOW_ID, NULL, GPSshow, 0); while(1){ } /* close the device file */ close(GPS_handle); } void open_port(char *port) { /* open the serial port device file * O_NDELAY - tells port to operate and ignore the DCD line * O_NOCTTY - this process is not to become the controlling * process for the port. The driver will not send * this process signals due to keyboard aborts, etc. * O_NONBLOCK- tells port to be nonblocking (read will return immediatly) */ GPS_handle = open(port, O_RDWR | O_NDELAY | O_NOCTTY | O_NONBLOCK); if (GPS_handle == -1) { perror("open_port: Unable to open"); exit(1); } else tcgetattr(GPS_handle, &tio); fcntl(GPS_handle, F_SETOWN, getpid()); fcntl(GPS_handle, F_SETFL, FASYNC); } /********************************************************************/ |
You can try using gpsd.
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Usb gps
I can't use gpsd because I want to program to read data from my GPS. My problem is that I don't know how to make the file asserted for USB hostport1 of SBC2440-IV Single Board Computer.
Somebody help me please, |
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