node.js usb在Ubuntu 12.04 Arm 7下的InEndpoint錯誤Cortex

我在當前具有ARMv7內部目標硬件（實用程序標準）上遇到問題。在usb模塊中使用node.js時，它在我的pc上運行良好，但現在在使用usb模塊的transmit-method讀取設備時將其移植到目標時存在問題。node.js usb在Ubuntu 12.04 Arm 7下的InEndpoint錯誤Cortex

這裏有系統的一些細節：

Linux utilite-ubuntu-desktop 3.0.35-cm-fx6-4 #123 SMP Thu Sep 12 10:41:30 IST 2013 armv7l armv7l armv7l GNU/Linux 
libusb version: 1.0-9 or 1.0-18 (both tested) 
node.js version: 0.10.22 (highest 0.10.x version to run on the target) 
usb version: latest, (but also others tested downto 2.0)

的錯誤，我得到的是如下（按順序）：

{ [Error: **UNKNOWN**] errno: 6 }

或

{ [Error: **UNKNOWN**] errno: 2 }

我擡頭似乎直接來自libusb（errno.h）的錯誤號碼：

#define ENOFILE 2 /* No such file or directory */ 
#define ENOENT 2 
#define ENXIO 6 /* No such device or address */

我的應用程序的源代碼是：

var usb = require('usb'); 

var panel_on_USB = usb.findByIds(conf.USB_VID, conf.USB_PID); 
panel_on_USB.open(); 

console.log("interface :"); 
console.log(panel_on_USB.interface(0)); 
console.log("timeout :" + panel_on_USB.timeout); 

var panel_interface = panel_on_USB.interface(0); 
panel_interface.claim(); 

console.log("isKernelDriverActive: " + panel_interface.isKernelDriverActive()); 
console.log("descriptor: " + panel_interface.descriptor); 
console.log("panel_interface: " + panel_interface.endpoints); 
console.log("LIBUSB_ENDPOINT_IN = " + usb.LIBUSB_ENDPOINT_IN); 
console.log("LIBUSB_ENDPOINT_OUT = " + usb.LIBUSB_ENDPOINT_OUT); 
console.log(panel_interface.endpoint(1).direction); 
console.log(panel_interface.endpoint(2).direction); 
console.log(panel_interface.endpoint(131).direction); 
console.log(panel_interface.endpoint(132).direction);

輸出到控制檯：

interface : 
{ device: 
    { busNumber: 2, 
    deviceAddress: 3, 
    deviceDescriptor: 
     { bLength: 18, 
     bDescriptorType: 1, 
     bcdUSB: 512, 
     bDeviceClass: 0, 
     bDeviceSubClass: 0, 
     bDeviceProtocol: 0, 
     bMaxPacketSize0: 8, 
     idVendor: 1240, 
     idProduct: 62765, 
     bcdDevice: 0, 
     iManufacturer: 1, 
     iProduct: 2, 
     iSerialNumber: 0, 
     bNumConfigurations: 1 }, 
    interfaces: [ [Circular] ] }, 
    id: 0, 
    altSetting: 0, 
    descriptor: 
    { bLength: 9, 
    bDescriptorType: 4, 
    bInterfaceNumber: 0, 
    bAlternateSetting: 0, 
    bNumEndpoints: 4, 
    bInterfaceClass: 255, 
    bInterfaceSubClass: 255, 
    bInterfaceProtocol: 255, 
    iInterface: 0, 
    extra: <Buffer >, 
    endpoints: [ [Object], [Object], [Object], [Object] ] }, 
    interfaceNumber: 0, 
    endpoints: 
    [ { device: [Object], 
     descriptor: [Object], 
     address: 1, 
     transferType: 2 }, 
    { device: [Object], 
     descriptor: [Object], 
     address: 2, 
     transferType: 2 }, 
    { device: [Object], 
     descriptor: [Object], 
     address: 131, 
     transferType: 2 }, 
    { device: [Object], 
     descriptor: [Object], 
     address: 132, 
     transferType: 2 } ] } 
timeout :1000 
isKernelDriverActive: true 
descriptor: [object Object] 
panel_interface: [object Object],[object Object],[object Object],[object Object] 
LIBUSB_ENDPOINT_IN = 128 
LIBUSB_ENDPOINT_OUT = 0 
out 
out 
in 
in

生成錯誤轉移呼叫：

panel_interface.endpoint(131).transfer(Length_Total_Bytes, function(error, data){ 
      if(error){ 
       //if(conf.Debug_Console_Output){ 
        console.log("USB_receive_Error:"); 
        console.log(error); 
       //} 
      } 
//...Data Handling done here...// 
});

瞭解這個任何想法？

來源

2014-05-06 B Piltz

由於transfer（）方法中實際接收的數據長度和設置的數據長度不匹配，導致問題發生。下面的代碼固定的問題，始終是滿的緩衝器返回到由設備在我的情況下，主機（這是wMaxPacketSize）：

var In_Transfer_Length = 1 * panel_interface.endpoint(131).descriptor.wMaxPacketSize; 
panel_interface.endpoint(131).transfer(In_Transfer_Length, function(error, data){

欲瞭解更多詳細信息，這在Github上查看問題：

https://github.com/nonolith/node-usb/issues/45

來源

2014-05-16 14:38:24

node.js usb在Ubuntu 12.04 Arm 7下的InEndpoint錯誤Cortex

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