Question

我已经实现了检测USB设备的功能。它工作，现在我需要发送/读取数据。

我开始查看很多obj-c来源，在Apple文档中只找到一个好的article，它描述了我们如何将包发送到我们的USB设备：

IOReturn WriteToDevice(IOUSBDeviceInterface **dev, UInt16 deviceAddress,
                        UInt16 length, UInt8 writeBuffer[])
{

    IOUSBDevRequest     request;
    request.bmRequestType = USBmakebmRequestType(kUSBOut, kUSBVendor,
                                                kUSBDevice);
    request.bRequest = 0xa0;
    request.wValue = deviceAddress;
    request.wIndex = 0;
    request.wLength = length;
    request.pData = writeBuffer;

    return (*dev)->DeviceRequest(dev, &request);
}

但我找不到如何使用Swift创建和发送数据的方法。 Swift上的结构如下所示：

public struct IOUSBDevRequest {
    public var bmRequestType: UInt8
    public var bRequest: UInt8
    public var wValue: UInt16
    public var wIndex: UInt16
    public var wLength: UInt16
    public var pData: UnsafeMutableRawPointer!
    public var wLenDone: UInt32
    public init()

    public init(bmRequestType: UInt8, bRequest: UInt8, wValue: UInt16, wIndex: UInt16, wLength: UInt16, pData: UnsafeMutableRawPointer!, wLenDone: UInt32)
}

我无法确定哪些参数是pData，zwLenDone。

这是我需要发送的数据：

{         
'direction':'in',         
'recipient':'device',
'requestType':  'standard',
'request':      6,         
'value':        0x300,         
'index':        0,         
'length':       255
}

接下来的问题是：我如何接收数据。我知道答案在本文中，但我无法将其转换为Swift。

以下是我在Swift 3转换的内容。我的班级检测到USB设备，获取他的配置：

class DFUDevice: NSObject {
let vendorId = 0x0483
let productId = 0xdf11

static let sharedInstance = DFUDevice()

var deviceName:String = ""

private func deviceAdded(iterator: io_iterator_t) {
    var plugInInterfacePtrPtr: UnsafeMutablePointer<UnsafeMutablePointer<IOCFPlugInInterface>?>?
    var deviceInterfacePtrPtr: UnsafeMutablePointer<UnsafeMutablePointer<IOUSBDeviceInterface>?>?
    var configPtr:IOUSBConfigurationDescriptorPtr?

    var score: Int32 = 0

    while case let usbDevice = IOIteratorNext(iterator), usbDevice != 0 {
        // io_name_t imports to swift as a tuple (Int8, ..., Int8) 128 ints
        // although in device_types.h it's defined:
        // typedef  char io_name_t[128];
        var deviceNameCString: [CChar] = [CChar](repeating: 0, count: 128)
        let deviceNameResult = IORegistryEntryGetName(usbDevice, &deviceNameCString)

        if(deviceNameResult != kIOReturnSuccess) {
            print("Error getting device name")
        }

        self.deviceName = String.init(cString: &deviceNameCString)
        print("usb Device Name: \(deviceName)")

        // Get plugInInterface for current USB device

        let plugInInterfaceResult = IOCreatePlugInInterfaceForService(
            usbDevice,
            kIOUSBDeviceUserClientTypeID,
            kIOCFPlugInInterfaceID,
            &plugInInterfacePtrPtr,
            &score)

        // dereference pointer for the plug in interface
        guard plugInInterfaceResult == kIOReturnSuccess,
            let plugInInterface = plugInInterfacePtrPtr?.pointee?.pointee else {
                print("Unable to get Plug-In Interface")
                continue
        }

        // use plug in interface to get a device interface
        let deviceInterfaceResult = withUnsafeMutablePointer(to: &deviceInterfacePtrPtr) {
            $0.withMemoryRebound(to: Optional<LPVOID>.self, capacity: 1) {
                plugInInterface.QueryInterface(
                    plugInInterfacePtrPtr,
                    CFUUIDGetUUIDBytes(kIOUSBDeviceInterfaceID),
                    $0)
            }
        }

        // dereference pointer for the device interface
        guard deviceInterfaceResult == kIOReturnSuccess,
            let deviceInterface = deviceInterfacePtrPtr?.pointee?.pointee else {
                print("Unable to get Device Interface")
                continue
        }

        var ret = deviceInterface.USBDeviceOpen(deviceInterfacePtrPtr)
        if (ret == kIOReturnSuccess)
        {
            // set first configuration as active
            ret = deviceInterface.GetConfigurationDescriptorPtr(deviceInterfacePtrPtr, 0, &configPtr)
            if (ret != kIOReturnSuccess)
            {
                print("Could not set active configuration (error: %x)\n", ret);
                continue
            }
            guard let config = configPtr?.pointee else {
                continue
            }

            if config.bLength > 0 {
                //HERE I NEED SEND DATA

            } else {
                print("ConfigurationDescriptor not valid")
            }
            print(config.bLength)
        }
        else if (ret == kIOReturnExclusiveAccess)
        {
            // this is not a problem as we can still do some things
        }
        else
        {
            print("Could not open device (error: %x)\n", ret)
            continue
        }

        IOObjectRelease(usbDevice)
    }
}


func initUsb() {
    var matchedIterator:io_iterator_t = 0
    var removalIterator:io_iterator_t = 0
    let notifyPort:IONotificationPortRef = IONotificationPortCreate(kIOMasterPortDefault)
    IONotificationPortSetDispatchQueue(notifyPort, DispatchQueue(label: "IODetector"))

    let matchingDict = IOServiceMatching(kIOUSBDeviceClassName)
        as NSMutableDictionary
    matchingDict[kUSBVendorID] = NSNumber(value: self.vendorId)
    matchingDict[kUSBProductID] = NSNumber(value: self.productId)

    let matchingCallback:IOServiceMatchingCallback = { (userData, iterator) in
        let this = Unmanaged<DFUDevice>
            .fromOpaque(userData!).takeUnretainedValue()
        this.deviceAdded(iterator: iterator)
        this.connected(iterator: iterator)
    }

    let removalCallback: IOServiceMatchingCallback = {
        (userData, iterator) in
        let this = Unmanaged<DFUDevice>
            .fromOpaque(userData!).takeUnretainedValue()
        this.disconnected(iterator: iterator)
    }

    let selfPtr = Unmanaged.passUnretained(self).toOpaque()

    IOServiceAddMatchingNotification(notifyPort, kIOFirstMatchNotification, matchingDict, matchingCallback, selfPtr, &matchedIterator)
    IOServiceAddMatchingNotification(notifyPort, kIOTerminatedNotification, matchingDict, removalCallback, selfPtr, &removalIterator)

    self.deviceAdded(iterator: matchedIterator)
    self.deviceAdded(iterator: removalIterator)

    RunLoop.current.run()
    }
}

我称之为：

let DFUDeviceDaemon = Thread(target: DFUDevice.sharedInstance, selector:#selector(DFUDevice.initUsb), object: nil)
DFUDeviceDaemon.start()

Answer 1

您引用的文章有一个名为WriteToDevice的函数。其中一个参数是

UInt8 writeBuffer[]

此writeBuffer是您要发送的数据，是一个C字节数组：

uint8_t msgLength = 3;
uint8_t writeBuffer[msgLength];
writeBuffer[0] = 0x41; // ASCII 'A'
writeBuffer[1] = 0x42; // ASCII 'B'
writeBuffer[2] = 0x43; // ASCII 'C'

您需要发送多少字节？这实际上取决于另一端的设备 - 制造商提供的技术数据应该告诉您。要将C数组作为NSData传递，这可能是pData的用途，你可以使用：

NSData *data = [NSData dataWithBytes:&writeBuffer length:3];

（z）wLenDone可能就是我所谓的msgLength，3。C-array不知道它们自己的长度，所以大多数函数都需要将长度作为一个单独的参数。

至于接收数据，我猜这会发生在matchingCallback中：你使用迭代器接收字节，然后解析它们。

回答评论：

我不熟悉C＃，而且我不是这方面的专家，但也许这会有所帮助：

var package = new UsbSetupPacket( 
(byte)(UsbCtrlFlags.Direction_In |
       UsbCtrlFlags.Recipient_Device | 
       UsbCtrlFlags.RequestType_Standard),  // Index
6,                      // length of data, second phase
0x200,                  // Request
0,                      // RequestType
(short)length);         // Value

一些观察结果：对C＃一无所知，但是不应该将包类型化为struct？ RequestType为0，因此您将不会收到任何响应 - 这是您想要的吗？或者你想发送UsbCtrlFlags.RequestType_Standard作为第四个参数？为什么要将长度作为值发送？

无论如何，你现在所做的是将包发送到USB设备，看看会发生什么。

Answer 2

经过很多关于 stackoverflow 和学习资源的问题后，我想出来了：

首先定义未实现的函数

import Foundation

import IOKit
import IOKit.usb
import IOKit.usb.IOUSBLib

//from IOUSBLib.h
let kIOUSBDeviceUserClientTypeID = CFUUIDGetConstantUUIDWithBytes(nil,
                                                                  0x9d, 0xc7, 0xb7, 0x80, 0x9e, 0xc0, 0x11, 0xD4,
                                                                  0xa5, 0x4f, 0x00, 0x0a, 0x27, 0x05, 0x28, 0x61)
let kIOUSBDeviceInterfaceID = CFUUIDGetConstantUUIDWithBytes(nil,
                                                             0x5c, 0x81, 0x87, 0xd0, 0x9e, 0xf3, 0x11, 0xD4,
                                                             0x8b, 0x45, 0x00, 0x0a, 0x27, 0x05, 0x28, 0x61)

//from IOCFPlugin.h
let kIOCFPlugInInterfaceID = CFUUIDGetConstantUUIDWithBytes(nil,
                                                            0xC2, 0x44, 0xE8, 0x58, 0x10, 0x9C, 0x11, 0xD4,
                                                            0x91, 0xD4, 0x00, 0x50, 0xE4, 0xC6, 0x42, 0x6F)


/*!
 @defined USBmakebmRequestType
 @discussion Macro to encode the bRequest field of a Device Request.  It is used when constructing an IOUSBDevRequest.
 */

func USBmakebmRequestType(direction:Int, type:Int, recipient:Int) -> UInt8 {
    return UInt8((direction & kUSBRqDirnMask) << kUSBRqDirnShift)|UInt8((type & kUSBRqTypeMask) << kUSBRqTypeShift)|UInt8(recipient & kUSBRqRecipientMask)
}

然后创建我们的课程：

extension Notification.Name {
    static let dfuDeviceConnected = Notification.Name("DFUDeviceConnected")
    static let dfuDeviceDisconnected = Notification.Name("DFUDeviceDisconnected")
}

class DFUDevice: NSObject {
let vendorId = 0x0483
let productId = 0xdf11

static let sharedInstance = DFUDevice()

var deviceInterfacePtrPtr: UnsafeMutablePointer<UnsafeMutablePointer<IOUSBDeviceInterface>?>?
var plugInInterfacePtrPtr: UnsafeMutablePointer<UnsafeMutablePointer<IOCFPlugInInterface>?>?
var interfacePtrPtr:UnsafeMutablePointer<UnsafeMutablePointer<IOUSBInterfaceInterface>?>?

private func rawDeviceAdded(iterator: io_iterator_t) {
    var score:Int32 = 0
    var kr:Int32 = 0

    while case let usbDevice = IOIteratorNext(iterator), usbDevice != 0 {
        // io_name_t imports to swift as a tuple (Int8, ..., Int8) 128 ints
        // although in device_types.h it's defined:
        // typedef  char io_name_t[128];
        var deviceNameCString: [CChar] = [CChar](repeating: 0, count: 128)
        let deviceNameResult = IORegistryEntryGetName(usbDevice, &deviceNameCString)

        if(deviceNameResult != kIOReturnSuccess) {
            print("Error getting device name")
        }

        let deviceName = String.init(cString: &deviceNameCString)
        print("usb Device Name: \(deviceName)")

        // Get plugInInterface for current USB device
        let plugInInterfaceResult = IOCreatePlugInInterfaceForService(
            usbDevice,
            kIOUSBDeviceUserClientTypeID,
            kIOCFPlugInInterfaceID,
            &plugInInterfacePtrPtr,
            &score)

        // USB device object is no longer needed.
        IOObjectRelease(usbDevice)

        // Dereference pointer for the plug-in interface
        guard plugInInterfaceResult == kIOReturnSuccess,
            let plugInInterface = plugInInterfacePtrPtr?.pointee?.pointee else {
                print("Unable to get Plug-In Interface")
                continue
        }

        // use plug in interface to get a device interface
        let deviceInterfaceResult = withUnsafeMutablePointer(to: &deviceInterfacePtrPtr) {
            $0.withMemoryRebound(to: Optional<LPVOID>.self, capacity: 1) {
                plugInInterface.QueryInterface(
                    plugInInterfacePtrPtr,
                    CFUUIDGetUUIDBytes(kIOUSBDeviceInterfaceID),
                    $0)
            }
        }

        // dereference pointer for the device interface
        guard deviceInterfaceResult == kIOReturnSuccess,
            let deviceInterface = deviceInterfacePtrPtr?.pointee?.pointee else {
                print("Unable to get Device Interface")
                continue
        }

        kr = deviceInterface.USBDeviceOpen(deviceInterfacePtrPtr)

        if (kr != kIOReturnSuccess)
        {
            print("Could not open device (error: \(kr))")
            continue
        }
        else if (kr == kIOReturnExclusiveAccess)
        {
            // this is not a problem as we can still do some things
            continue
        }

        self.connected()
    }
}

private func rawDeviceRemoved(iterator: io_iterator_t) {
    var kr:Int32 = 0

    while case let usbDevice = IOIteratorNext(iterator), usbDevice != 0 {
        // USB device object is no longer needed.
        kr = IOObjectRelease(usbDevice)

        if (kr != kIOReturnSuccess)
        {
            print("Couldn’t release raw device object (error: \(kr))")
            continue
        }

        self.disconnected()

    }
}

func getStatus() throws -> [UInt8] {
    guard let deviceInterface = self.deviceInterfacePtrPtr?.pointee?.pointee else {
        throw DFUDeviceError.DeviceInterfaceNotFound
    }

    var kr:Int32 = 0
    let length:Int = 6
    var requestPtr:[UInt8] = [UInt8](repeating: 0, count: length)
    var request = IOUSBDevRequest(bmRequestType: USBmakebmRequestType(direction: kUSBIn, type: kUSBDevice, recipient: kUSBStandard),
                                  bRequest: DFUREQUEST.GETSTATUS.rawValue,
                                  wValue: 0,
                                  wIndex: 0,
                                  wLength: UInt16(length),
                                  pData: &requestPtr,
                                  wLenDone: 255)

    kr = deviceInterface.DeviceRequest(self.deviceInterfacePtrPtr, &request)

    if (kr != kIOReturnSuccess) {
        throw DFUDeviceError.RequestError(desc: "Get device status request error: \(kr)")
    }

    return requestPtr
}



private func configureDevice() -> Int32 {
    var kr:Int32 = 0

    guard let deviceInterface = deviceInterfacePtrPtr?.pointee?.pointee else {
        print("Unable to get Device Interface")
        return -1
    }

    var numConfig:UInt8 = 0

    kr = deviceInterface.GetNumberOfConfigurations(deviceInterfacePtrPtr, &numConfig)
    if numConfig == 0 {
        print("Device Number Of Configurations: 0")
        return -1
    }

    var configPtr:IOUSBConfigurationDescriptorPtr?

    // set first configuration as active
    kr = deviceInterface.GetConfigurationDescriptorPtr(deviceInterfacePtrPtr, 0, &configPtr)
    if (kr != kIOReturnSuccess)
    {
        print("Couldn’t get configuration descriptor for index (error: %x)\n", kr);
        return -1
    }

    guard let config = configPtr?.pointee else {
        return -1
    }

    //Set the device’s configuration. The configuration value is found in
    //the bConfigurationValue field of the configuration descriptor

    kr = deviceInterface.SetConfiguration(deviceInterfacePtrPtr, config.bConfigurationValue)
    if (kr != kIOReturnSuccess)
    {
        print("Couldn’t set configuration to value (error: %x)\n", kr);
        return -1
    }

    return kIOReturnSuccess
}


func connected() {
    NotificationCenter.default.post(name: .dfuDeviceConnected, object: nil)
    globalLogPost("DFU device has been device connected")
}

func disconnected() {
    NotificationCenter.default.post(name: .dfuDeviceDisconnected, object: nil)
    globalLogPost("DFU device has been disconnected")
}

func initUsb() {
    var matchedIterator:io_iterator_t = 0
    var removalIterator:io_iterator_t = 0
    let notifyPort:IONotificationPortRef = IONotificationPortCreate(kIOMasterPortDefault)
    IONotificationPortSetDispatchQueue(notifyPort, DispatchQueue(label: "IODetector"))

    let matchingDict = IOServiceMatching(kIOUSBDeviceClassName)
        as NSMutableDictionary
    matchingDict[kUSBVendorID] = NSNumber(value: self.vendorId)
    matchingDict[kUSBProductID] = NSNumber(value: self.productId)

    let matchingCallback:IOServiceMatchingCallback = { (userData, iterator) in
        let this = Unmanaged<DFUDevice>
            .fromOpaque(userData!).takeUnretainedValue()
        this.rawDeviceAdded(iterator: iterator)
    }

    let removalCallback: IOServiceMatchingCallback = {
        (userData, iterator) in
        let this = Unmanaged<DFUDevice>
            .fromOpaque(userData!).takeUnretainedValue()
        this.rawDeviceRemoved(iterator: iterator)
    }

    let selfPtr = Unmanaged.passUnretained(self).toOpaque()

    IOServiceAddMatchingNotification(notifyPort, kIOFirstMatchNotification, matchingDict, matchingCallback, selfPtr, &matchedIterator)
    IOServiceAddMatchingNotification(notifyPort, kIOTerminatedNotification, matchingDict, removalCallback, selfPtr, &removalIterator)

    self.rawDeviceAdded(iterator: matchedIterator)
    self.rawDeviceRemoved(iterator: removalIterator)

    RunLoop.current.run()
}
}

您可以查看我创建getStatus的方法USBRequest并将其发送到设备。然后在requestPtr:[UInt8]我收到了来自设备的回答。谢谢你的帮助。

我们可以在项目的任何地方使用矿石设备指针，例如：

func upload(value:UInt16, length:UInt16) throws -> [UInt8] {
        guard let deviceInterface = DFUDevice.sharedInstance.deviceInterfacePtrPtr?.pointee?.pointee else {
            throw DFUDeviceError.DeviceInterfaceNotFound
        }
        var kr:Int32 = 0
        var requestPtr:[UInt8] = [UInt8](repeating: 0, count: Int(length))

        var request = IOUSBDevRequest(bmRequestType: 161,
                                      bRequest: DFUREQUEST.UPLOAD.rawValue,
                                      wValue: value,
                                      wIndex: 0,
                                      wLength: length,
                                      pData: &requestPtr,
                                      wLenDone: 255)

        kr = deviceInterface.DeviceRequest(DFUDevice.sharedInstance.deviceInterfacePtrPtr, &request)

        if (kr != kIOReturnSuccess) {
            throw DFUDeviceError.RequestError(desc: "Upload request error: \(kr), request data: \(request)")
        }

        return requestPtr
    }

USB设备发送/接收数据

2 个答案: