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Re: [pyusb-users] Writing and reading hexadecimal command
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From: raphael m. <rap...@or...> - 2019-11-21 11:01:10
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Bonjour, Thank you for your answer, The DP5_Programmer's guide can be found here: http://experimentationlab.berkeley.edu/sites/default/files/images/DP5_Programmers_Guide_A4.pdf And the entire code is here (Python_SDK\pyDppUSB): https://www.amptek.com/-/media/ametekamptek/documents/softwares/Python_SDK.zip?la=en I run the pyDP5.py module (Python_SDK\pyDppUSB\pyDP5.py), and here is a selected part (from Python_SDK\pyDppUSB\DppLibusb.py) that I'm interested in. As I said, this code was provide by Amptek when I contacted them, but it's for demo only in python 2, and not offically supported (that's the reason why it's pretty "dirty", with the few correction I already added): from vbfunctions import * from vbclasses import * import usb import sys import time from dppStatus import * import codecs decode_hex = codecs.getdecoder("hex_codec") LIBUSB_TIMEOUT = 500 #REQUEST_STATUS_PACKET = decode_hex('F5FA01010000FE0F') # Request Status Packet REQUEST_STATUS_PACKET = '\xf5\xfa\x01\x01\x00\x00\xfe\x0f' #------------------------------------------------------------------------------- # DppLibusb Class #------------------------------------------------------------------------------- class DppLibusb(): def __init__(self): self.VENDOR = 0x10C4 self.PRODUCT = 0x842A self.CONFIGURATION = 1 self.INTERFACE = 0 self.ENDPOINT_IN = 0x81 self.ENDPOINT_OUT = 0x02 self.device = None self.handle = None self.device = usb.core.find(idVendor=0x10c4, idProduct=0x842a) #for bus in usb.busses(): # for dev in bus.devices: # if dev.idVendor == self.VENDOR and dev.idProduct == self.PRODUCT: # self.device = dev self.strStatus = str() self.bArrStatusIn = bytes() self.bArrBuffer = bytes() self.AckPid2 = bytes() self.AckMsg = str() #self.STATUS = STATUS self.DataRaw = bytes() self.Channels = int() self.Data = int() self.Header = bytes() self.bArrArrBuffer = bytearray() if self.open() == None: print (sys.stderr, "Unable to open DppLibusb device!") sys.exit() return None def isConnected(self): _ret = False iNumBytes = 0 print("Get Status") try: iNumBytes = self.write(REQUEST_STATUS_PACKET, LIBUSB_TIMEOUT) except usb.USBError as err: pass if iNumBytes > 0: print ('Bytes Out =',iNumBytes) # debug try: self.bArrArrBuffer = self.read(128, LIBUSB_TIMEOUT) self.bArrStatusIn = bytearray(self.bArrArrBuffer) except usb.USBError as err: pass if len(self.bArrStatusIn) > 0: print ("STATUS.RAW type ", type(self.STATUS.RAW)) self.STATUS.RAW = bytearray(self.bArrStatusIn[6:70]) if len(self.STATUS.RAW) > 0: Process_Status(self.STATUS) if (self.STATUS.SerialNumber > 0): _ret = True return _ret While the iNumbytes get a value from the iNumBytes = self.write(REQUEST_STATUS_PACKET, LIBUSB_TIMEOUT) (which might be a wrong value), the self.bArrArrBuffer = self.read(128, LIBUSB_TIMEOUT) is never reached. So my guess is that the REQUEST_STATUS_PACKET is in the wrong format, thus my original question : how do I write and read instruction in hexadecimal ? Is converting the whole instruction in string via REQUEST_STATUS_PACKET = '\xf5\xfa\x01\x01\x00\x00\xfe\x0f' correct ? (I doubt it is). Again, sorry for the "messy" code, and thanks for any answer provided. Best regards Raphaël > Message du 21/11/19 10:11 > De : "Nicolas Pinault via pyusb-users" > A : pyu...@li... > Copie à : "Nicolas Pinault" > Objet : Re: [pyusb-users] Writing and reading hexadecimal command > > Bonjour Raphaël, > > You do not provide enought information. > Can you provide a link to the DP5 documentation ? > Can you provide a small code sample ? > > Bonne journée, > Nicolas > > > Le 21/11/2019 à 09:43, raphael moreau a écrit : > > Good morning pyusb users, > > I'm writing you this emial because I'm facing an issue that I did not succed to resolve until now, and I'm sure you will. > > I'm currently working on a Python project which involve the communication witn an USB Device (DP5 Amptek SDD Detector, an x-ray detector), and after a few test it seems that my device dont understand what I'm telling him to do. > > I started with the basic, a Device Status request, which is the following (.jgp screenshot, I hope you'll be able to see it): > > > I tried the classic dev.write(x,test,x), with test = '\xf5\xfa\x01\x01\x00\x00\xfe\x0f', or test = '\xf5\xfa1100\xfe\x0f' but the expected result, which is the following(same here, .jpg screenshot): > > > does not seems to be return with res = dev.read(x, length, x) with length = 128 or length = 64 (seems odd to me for the 128 but i guess it's for the array format?) > > > My question is therefore quit simple, how do I pass and read thoses command ? > > I'm using python 3, and I have no problem in term of identification of the device, configuration, interface and endpoint IN and OUT, with pyusb. > > The program I'm using is an old python 2 demo supplied by the manufacturer which is not supported by them. > I precise that I'm rather new to USB and programming in general, so I apologize if this question seems basic, or had already been answered to. > > Thank you for any response, > > Best regards, > > > > Raphaël Moreau > > > > > > _______________________________________________ pyusb-users mailing list pyu...@li... https://lists.sourceforge.net/lists/listinfo/pyusb-users > _______________________________________________ pyusb-users mailing list pyu...@li... https://lists.sourceforge.net/lists/listinfo/pyusb-users |