ret=usb_bulk_write(gh->handle,0x02,txbuf,size,0);
if(ret<=0) {
perror("usb bulk write");
ret=usb_bulk_write(gh->handle,0x02,txbuf,size,0);
if(ret<=0) {
perror("usb bulk write");
ret=usb_bulk_read(gh->handle,0x81,rxbuf,sizeof(rxbuf),0);
size=ret;
if(ret<=0) {
perror("usb bulk read");
return ret;
}
ret=usb_bulk_read(gh->handle,0x81,rxbuf,sizeof(rxbuf),0);
size=ret;
if(ret<=0) {
perror("usb bulk read");
return ret;
}