sillab-usb.py

来自「Buck Read Write Sil lab C8051F320 wiht p」· Python 代码 · 共 54 行

# -*- coding: utf-8 -*-

import usb

ID_VENDOR = 0x10C4
ID_PRODUCT = 0x0002
ID_INTERFACE = 0
EP_IN = 0x82
EP_OUT = 0x02
TIME_OUT = 200

def getDevice(device_nro):
    buses = usb.busses()
    devices = ()
    for bus in buses :
        for device in bus.devices :
            if device.idVendor == ID_VENDOR:
                if device.idProduct == ID_PRODUCT:
                    devices += device,
    if len(devices) >= (device_nro + 1):
        return devices[device_nro]
    else:
        raise Exception, "Numero de device no encontrado"

class SafeUSB(object):
    
    def __init__(self, device):
        self.device = device
        self.active = False
        
    def getDeviceInfo(self):
        print "Vendor ID: %d  Product ID: %d" % ( self.device.idVendor, self.device.idProduct)
    
    def setActive(self, value) :
        if value != self.active:
            if value:
                self.handle = self.device.open()
                #self.handle.detachKernelDriver(ID_INTERFACE)
                self.handle.claimInterface(ID_INTERFACE)
                self.handle.setAltInterface(ID_INTERFACE)
            else:
                self.handle.releaseInterface()
                self.handle.reset()
                
            self.active = value

    def read(self, bytesToRead):
        return self.handle.bulkRead(EP_IN, bytesToRead, TIME_OUT)

    def write(self, buf):
        return self.handle.bulkWrite(EP_OUT, buf, TIME_OUT)