Hi,
I would like to read and write informations (just some bytes) with USB.
(For information my device is a pic which works in low speed in interruptb transfer
but it's not important because the above program send me information from device
properly.)
That works properly under windows...
And now reading from device is succeful under linus-2.4.20.
I use the file /dev/usb/hiddev0.
Here is the program:
typedef struct {
unsigned hid;
signed int value;
} hiddev_event;
main(){
ssize_t bytesread;
int FILEDES;
hiddev_event *buffer;
buffer=(hiddev_event *)malloc(sizeof(hiddev_event));
FILEDES=open("/dev/usb/hiddev0",O_RDONLY);
bytesread=1;
while(bytesread>0){
bytesread=read(FILEDES,buffer,sizeof(hiddev_event));
if(bytesread!=sizeof(hiddev_event)){
exit(1);
}
printf("Unknown event bytes=%d hid=%d value=%d\n",
bytesread,buffer->hid,buffer->value);
}
When I try to write in fd (in order to write to the device) errno return me the value
22(EINVAL) although I open fd in O_WRONLY or O_RDWR...
Do an other driver exist than HID to communicate PC/DEVICE????
B.GIRAUD<[EMAIL PROTECTED]>
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