I have an USB-GPS receiver (Haicom 204E) and a SBC2440-IV Single Board
Computer. I have 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
I create /dev/ttyUSB0 file by using command "$ mknod /dev/ttyUSB0 c 188
0". I see a file "ttyUSB0" in root/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);
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/
USB GPS Haicom204E is a device which has USB output port; baud-rate
4800,8,N,1;
NMEA108 standard.
My problem is that I don"t know how to make the file asserted for USB
hostport1 of
SBC2440-IV Single Board Computer.