[問題] 關於linux的usb_open函式
小弟是初學者
最近靠自己摸索加練習用寫了一個關於USB的程式
並且可以顯示出product id與vender id
但是就在usb_open函式這地方出錯
錯誤訊息如下
http://i.imgur.com/vEmcw.png
然後我的函式如下
void usbio_main(struct usb_device *dev)
{
int y;
usb_dev_handle *dev_handle;
dev_handle = usb_open(dev);
if (dev_handle == NULL) {
printf("USB IO open failed.\n");
return;
}
printf("USB DEVICE FOUND.\n");
input_report_rel(dev, REL_Y,y);
printf("Value:\n",y);
usb_close(dev_handle);
}
希望可以拜託各位前輩幫我解惑
到底是我回傳回來的dev有問題
還是我的設備有問題= =？
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