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Serial communication using pyjnius, Arduino Nano and USB-OTG
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| #!/usr/bin/python | |
| # -*- coding: utf-8 -*- | |
| __author__ = ('Kaan Akşit') | |
| try: | |
| import sys,time | |
| from array import array | |
| from jnius import autoclass | |
| from jnius import cast | |
| except ImportError, err: | |
| print "couldn't load module. %s" % (err) | |
| sys.exit() | |
| # Class for serial communication using USB-OTG cable in an Android OS. | |
| class Serial: | |
| def __init__(self,port,speed): | |
| self.Context = autoclass('android.content.Context') | |
| self.UsbConstants = autoclass('android.hardware.usb.UsbConstants') | |
| self.UsbDevice = autoclass('android.hardware.usb.UsbDevice') | |
| self.UsbDeviceConnection = autoclass('android.hardware.usb.UsbDeviceConnection') | |
| self.UsbEndpoint = autoclass('android.hardware.usb.UsbEndpoint') | |
| self.UsbInterface = autoclass('android.hardware.usb.UsbInterface') | |
| self.UsbManager = autoclass('android.hardware.usb.UsbManager') | |
| self.UsbRequest = autoclass('android.hardware.usb.UsbRequest') | |
| self.PythonActivity = autoclass('org.renpy.android.PythonActivity') | |
| self.activity = self.PythonActivity.mActivity | |
| self.speed = speed | |
| self.port = port | |
| self.ReadCache = [] | |
| self.usb_mgr = cast(self.UsbManager, self.activity.getSystemService(self.Context.USB_SERVICE)) | |
| print [d.getKey() for d in self.usb_mgr.getDeviceList().entrySet().toArray()] | |
| self.device = self.usb_mgr.getDeviceList().get(port) | |
| self.cmd = 'k00' | |
| if self.device: | |
| Intent = autoclass('android.content.Intent') | |
| PendingIntent = autoclass('android.app.PendingIntent') | |
| ACTION_USB_PERMISSION = "com.access.device.USB_PERMISSION" | |
| intent = Intent(ACTION_USB_PERMISSION) | |
| pintent = PendingIntent.getBroadcast(self.activity,0,intent,0) | |
| self.usb_mgr.requestPermission(self.device,pintent) | |
| if self.usb_mgr.hasPermission(self.device): | |
| print 'Device permission granted!' | |
| print 'InterfaceCount: ', self.device.getInterfaceCount() | |
| self.intf = cast(self.UsbInterface, self.device.getInterface(0)) | |
| self.UsbConnection = cast(self.UsbDeviceConnection,self.usb_mgr.openDevice(self.device)) | |
| print self.UsbConnection | |
| self.UsbConnection.claimInterface(self.intf, True) | |
| print 'SerialNumber: ', self.UsbConnection.getSerial() | |
| self.UsbConnection.controlTransfer(0x40, 0, 0, 0, None, 0, 0) | |
| self.UsbConnection.controlTransfer(0x40, 0, 1, 0, None, 0, 0) | |
| self.UsbConnection.controlTransfer(0x40, 0, 2, 0, None, 0, 0) | |
| self.UsbConnection.controlTransfer(0x40, 2, 0, 0, None, 0, 0) | |
| self.UsbConnection.controlTransfer(0x40, 3, 0x0034, 0, None, 0, 0) | |
| self.UsbConnection.controlTransfer(0x40, 4, 8, 0, None, 0, 0) | |
| for i in xrange(0, self.intf.getEndpointCount()): | |
| if self.intf.getEndpoint(i).getType() == self.UsbConstants.USB_ENDPOINT_XFER_BULK: | |
| if self.intf.getEndpoint(i).getDirection() == self.UsbConstants.USB_DIR_IN: | |
| self.epIN = self.intf.getEndpoint(i) | |
| elif self.intf.getEndpoint(i).getDirection() == self.UsbConstants.USB_DIR_OUT: | |
| self.epOUT = self.intf.getEndpoint(i) | |
| else: | |
| print 'Device permission not granted!' | |
| else: | |
| print 'Device not found.' | |
| sys.exit() | |
| return | |
| def send(self,msg): | |
| MsgOut = msg | |
| MsgOutHex = map(ord,MsgOut) | |
| self.UsbConnection.bulkTransfer(self.epOUT, MsgOutHex, len(MsgOutHex), 0) | |
| return True | |
| def read(self,BufSize=35): | |
| time.sleep(0.03) | |
| response = [0]*BufSize | |
| length = self.UsbConnection.bulkTransfer(self.epIN, response, len(response), 50) | |
| if length >= 0: | |
| self.ReadCache = response | |
| return True | |
| def asyncRead(self): | |
| self.send(self.cmd) | |
| self.read() | |
| return | |
| def disconnet(self): | |
| self.UsbConnection.close() | |
| return True | |
| def main(): | |
| pass | |
| return True | |
| # Call for main definition upon initialization. | |
| if __name__ == '__main__': | |
| sys.exit(main()) |
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What asyncRead method do?
Have you use this class in any application?