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);
}
/********************************************************************/
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Usb gps
