2 # GoodFET Client Library for Maxim USB Chips.
4 # (C) 2012 Travis Goodspeed <travis at radiantmachines.com>
6 # This code is being rewritten and refactored. You've been warned!
9 import sys, time, string, cStringIO, struct, glob, os;
11 from GoodFET import GoodFET;
35 rIOPINS1=20 #Same as rIOPINS
53 # R11 EPIRQ register bits
61 # R12 EPIEN register bits
72 # ************************
73 # Standard USB Requests
74 SR_GET_STATUS =0x00 # Get Status
75 SR_CLEAR_FEATURE =0x01 # Clear Feature
76 SR_RESERVED =0x02 # Reserved
77 SR_SET_FEATURE =0x03 # Set Feature
78 SR_SET_ADDRESS =0x05 # Set Address
79 SR_GET_DESCRIPTOR =0x06 # Get Descriptor
80 SR_SET_DESCRIPTOR =0x07 # Set Descriptor
81 SR_GET_CONFIGURATION =0x08 # Get Configuration
82 SR_SET_CONFIGURATION =0x09 # Set Configuration
83 SR_GET_INTERFACE =0x0a # Get Interface
84 SR_SET_INTERFACE =0x0b # Set Interface
86 # Get Descriptor codes
87 GD_DEVICE =0x01 # Get device descriptor: Device
88 GD_CONFIGURATION =0x02 # Get device descriptor: Configuration
89 GD_STRING =0x03 # Get device descriptor: String
90 GD_HID =0x21 # Get descriptor: HID
91 GD_REPORT =0x22 # Get descriptor: Report
93 # SETUP packet header offsets
103 # HID bRequest values
161 # Host XFR token values for writing the HXFR register (R30).
162 # OR this bit field with the endpoint number in bits 3:0
163 tokSETUP =0x10 # HS=0, ISO=0, OUTNIN=0, SETUP=1
164 tokIN =0x00 # HS=0, ISO=0, OUTNIN=0, SETUP=0
165 tokOUT =0x20 # HS=0, ISO=0, OUTNIN=1, SETUP=0
166 tokINHS =0x80 # HS=1, ISO=0, OUTNIN=0, SETUP=0
167 tokOUTHS =0xA0 # HS=1, ISO=0, OUTNIN=1, SETUP=0
168 tokISOIN =0x40 # HS=0, ISO=1, OUTNIN=0, SETUP=0
169 tokISOOUT =0x60 # HS=0, ISO=1, OUTNIN=1, SETUP=0
176 # Host error result codes, the 4 LSB's in the HRSL register.
195 bmBUSEVENTIRQ =0x01 # indicates BUS Reset Done or BUS Resume
204 class GoodFETMAXUSB(GoodFET):
207 def setup2str(self,SUD):
208 """Converts the header of a setup packet to a string."""
209 return "bmRequestType=0x%02x, bRequest=0x%02x, wValue=0x%04x, wIndex=0x%04x, wLength=0x%04x" % (
210 ord(SUD[0]), ord(SUD[1]),
211 ord(SUD[2])+(ord(SUD[3])<<8),
212 ord(SUD[4])+(ord(SUD[5])<<8),
213 ord(SUD[6])+(ord(SUD[7])<<8)
216 def MAXUSBsetup(self):
217 """Move the FET into the MAXUSB application."""
218 self.writecmd(self.MAXUSBAPP,0x10,0,self.data); #MAXUSB/SETUP
219 print "Connected to MAX342x Rev. %x" % (self.rreg(rREVISION));
220 self.wreg(rPINCTL,0x18); #Set duplex and negative INT level.
222 def MAXUSBtrans8(self,byte):
223 """Read and write 8 bits by MAXUSB."""
224 data=self.MAXUSBtrans([byte]);
227 def MAXUSBtrans(self,data):
228 """Exchange data by MAXUSB."""
230 self.writecmd(self.MAXUSBAPP,0x00,len(data),data);
234 """Peek 8 bits from a register."""
236 self.writecmd(self.MAXUSBAPP,0x00,len(data),data);
237 return ord(self.data[1]);
238 def rregAS(self,reg):
239 """Peek 8 bits from a register, setting AS."""
241 self.writecmd(self.MAXUSBAPP,0x00,len(data),data);
242 return ord(self.data[1]);
243 def wreg(self,reg,value):
244 """Poke 8 bits into a register."""
245 data=[(reg<<3)|2,value];
246 self.writecmd(self.MAXUSBAPP,0x00,len(data),data);
248 def wregAS(self,reg,value):
249 """Poke 8 bits into a register, setting AS."""
250 data=[(reg<<3)|3,value];
251 self.writecmd(self.MAXUSBAPP,0x00,len(data),data);
253 def readbytes(self,reg,length):
254 """Peek some bytes from a register."""
255 data=[(reg<<3)]+range(0,length);
256 self.writecmd(self.MAXUSBAPP,0x00,len(data),data);
257 toret=self.data[1:len(self.data)];
260 ashex=ashex+(" %02x"%ord(foo));
261 print "GET %02x==%s" % (reg,ashex);
263 def ctl_write_nd(self,request):
264 """Control Write with no data stage. Assumes PERADDR is set
265 and the SUDFIFO contains the 8 setup bytes. Returns with
266 result code = HRSLT[3:0] (HRSL register). If there is an
267 error, the 4MSBits of the returned value indicate the stage 1
270 # 1. Send the SETUP token and 8 setup bytes.
271 # Should ACK immediately.
272 self.writebytes(rSUDFIFO,request);
273 resultcode=self.send_packet(tokSETUP,0); #SETUP packet to EP0.
274 if resultcode: return resultcode;
276 # 2. No data stage, so the last operation is to send an IN
277 # token to the peripheral as the STATUS (handhsake) stage of
278 # this control transfer. We should get NAK or the DATA1 PID.
279 # When we get back to the DATA1 PID the 3421 automatically
280 # sends the closing NAK.
281 resultcode=self.send_packet(tokINHS,0); #Function takes care of retries.
282 if resultcode: return resultcode;
287 def ctl_read(self,request):
288 """Control read transfer, used in Host mode."""
290 bytes_to_read=request[6]+256*request[7];
293 self.writebytes(rSUDFIFO,request); #Load the FIFO
294 resultcode=self.send_packet(tokSETUP,0); #SETUP packet to EP0
296 print "Failed to get ACK on SETUP request in ctl_read()."
299 self.wreg(rHCTL,bmRCVTOG1); #FIRST data packet in CTL transfer uses DATA1 toggle.
300 resultcode=self.IN_Transfer(0,bytes_to_read);
302 print "Failed on IN Transfer in ctl_read()";
305 self.IN_nak_count=self.nak_count;
307 #The OUT status stage.
308 resultcode=self.send_packet(tokOUTHS,0);
310 print "Failed on OUT Status stage in ctl_read()";
315 xfrdata=[]; #Ugly variable used only by a few functions. FIXME
316 def IN_Transfer(self,endpoint,INbytes):
317 """Does an IN transfer to an endpoint, used for Host mode."""
323 resultcode=self.send_packet(tokIN,endpoint); #IN packet to EP. NAKS taken care of.
324 if resultcode: return resultcode;
326 pktsize=self.rreg(rRCVBC); #Numer of RXed bytes.
328 #Very innefficient, move this to C if performance is needed.
329 for j in range(0,pktsize):
330 self.xfrdata=self.xfrdata+[self.rreg(rRCVFIFO)];
331 xfrsize=self.xfrdata[0];
332 self.wreg(rHIRQ,bmRCVDAVIRQ); #Clear IRQ
333 xfrlen=xfrlen+pktsize; #Add byte count to total transfer length.
335 print "%i / %i" % (xfrlen,xfrsize)
337 #Packet is complete if:
338 # 1. The device sent a short packet, <maxPacketSize
339 # 2. INbytes have been transfered.
340 if (pktsize<self.maxPacketSize) or (xfrlen>=xfrsize):
341 self.last_transfer_size=xfrlen;
343 for foo in self.xfrdata:
344 ashex=ashex+(" %02x"%foo);
345 print "INPACKET EP%i==%s (0x%02x bytes remain)" % (endpoint,ashex,xfrsize);
350 def send_packet(self,token,endpoint):
351 """Send a packet to an endpoint as the Host, taking care of NAKs.
352 Don't use this for device code."""
356 #Repeat until NAK_LIMIT or RETRY_LIMIT is reached.
357 while self.nak_count<self.NAK_LIMIT and self.retry_count<self.RETRY_LIMIT:
358 self.wreg(rHXFR,(token|endpoint)); #launch the transfer
359 while not (self.rreg(rHIRQ) & bmHXFRDNIRQ):
360 # wait for the completion IRQ
362 self.wreg(rHIRQ,bmHXFRDNIRQ); #Clear IRQ
363 resultcode = (self.rreg(rHRSL) & 0x0F); # get the result
364 if (resultcode==hrNAK):
365 self.nak_count=self.nak_count+1;
366 elif (resultcode==hrTIMEOUT):
367 self.retry_count=self.retry_count+1;
373 def writebytes(self,reg,tosend):
374 """Poke some bytes into a register."""
376 if type(tosend)==str:
377 data=chr((reg<<3)|2)+tosend;
378 print "PUT %02x:=%s" % (reg,tosend)
380 data=[(reg<<3)|2]+tosend;
383 ashex=ashex+(" %02x"%foo);
384 print "PUT %02x:=%s" % (reg,ashex)
385 self.writecmd(self.MAXUSBAPP,0x00,len(data),data);
386 def usb_connect(self):
387 """Connect the USB port."""
389 #disconnect D+ pullup if host turns off VBUS
390 self.wreg(rUSBCTL,bmVBGATE|bmCONNECT);
391 def usb_disconnect(self):
392 """Disconnect the USB port."""
393 self.wreg(rUSBCTL,bmVBGATE);
394 def STALL_EP0(self,SUD=None):
395 """Stall for an unknown SETUP event."""
397 print "Stalling EP0.";
399 print "Stalling EPO for %s" % self.setup2str(SUD);
400 self.wreg(rEPSTALLS,0x23); #All three stall bits.
401 def SETBIT(self,reg,val):
402 """Set a bit in a register."""
403 self.wreg(reg,self.rreg(reg)|val);
405 """Turn on the target device."""
406 self.wreg(rIOPINS2,(self.rreg(rIOPINS2)|0x08));
408 """Turn off the target device's power."""
409 self.wreg(rIOPINS2,0x00);
410 def reset_host(self):
411 """Resets the chip into host mode."""
412 self.wreg(rUSBCTL,bmCHIPRES); #Stop the oscillator.
413 self.wreg(rUSBCTL,0x00); #restart it.
414 while self.rreg(rUSBIRQ)&bmOSCOKIRQ:
415 #Hang until the PLL stabilizes.
418 class GoodFETMAXUSBHost(GoodFETMAXUSB):
419 """This is a class for implemented a minimal USB host.
420 It's intended for fuzzing, rather than for daily use."""
422 """Initialize the MAX3421 as a USB Host."""
424 self.wreg(rPINCTL,(bmFDUPSPI|bmPOSINT));
432 """Run as a minimal host and dump the config tables."""
434 self.detect_device();
436 self.enumerate_device();
437 self.wait_for_disconnect();
438 def detect_device(self):
439 """Waits for a device to be inserted and then returns."""
442 #Activate host mode and turn on 15K pulldown resistors on D+ and D-.
443 self.wreg(rMODE,(bmDPPULLDN|bmDMPULLDN|bmHOST));
444 #Clear connection detect IRQ.
445 self.wreg(rHIRQ,bmCONDETIRQ);
447 print "Waiting for a device connection.";
449 self.wreg(rHCTL,bmSAMPLEBUS); #Update JSTATUS and KSTATUS bits.
450 busstate=self.rreg(rHRSL) & (bmJSTATUS|bmKSTATUS);
452 if busstate==bmJSTATUS:
453 print "Detected Full-Speed Device.";
454 self.wreg(rMODE,(bmDPPULLDN|bmDMPULLDN|bmHOST|bmSOFKAENAB));
455 elif busstate==bmKSTATUS:
456 print "Detected Low-Speed Device.";
457 self.wreg(rMODE,(bmDPPULLDN|bmDMPULLDN|bmHOST|bmLOWSPEED|bmSOFKAENAB));
459 print "Not sure whether this is Full-Speed or Low-Speed. Please investigate.";
460 def wait_for_disconnect(self):
461 """Wait for a device to be disconnected."""
462 print "Waiting for a device disconnect.";
464 self.wreg(rHIRQ,bmCONDETIRQ); #Clear disconnect IRQ
465 while not (self.rreg(rHIRQ) & bmCONDETIRQ):
466 #Wait for IRQ to change.
470 self.wreg(rMODE,bmDPPULLDN|bmDMPULLDN|bmHOST);
471 print "Device disconnected.";
472 self.wreg(rIOPINS2,(self.rreg(rIOPINS2) & ~0x04)); #HL1_OFF
473 self.wreg(rIOPINS1,(self.rreg(rIOPINS1) & ~0x02)); #HL4_OFF
475 def enumerate_device(self):
476 """Enumerates a device on the present port."""
478 Set_Address_to_7 = [0x00,0x05,0x07,0x00,0x00,0x00,0x00,0x00];
479 Get_Descriptor_Device = [0x80,0x06,0x00,0x01,0x00,0x00,0x00,0x00]; #len filled in
480 Get_Descriptor_Config = [0x80,0x06,0x00,0x02,0x00,0x00,0x00,0x00];
483 print "Issuing USB bus reset.";
484 self.wreg(rHCTL,bmBUSRST);
485 while self.rreg(rHCTL) & bmBUSRST:
486 #Wait for reset to complete.
491 #Get the device descriptor.
492 self.wreg(rPERADDR,0); #First request to address 0.
493 self.maxPacketSize=8; #Only safe value for first check.
494 Get_Descriptor_Device[6]=8; # wLengthL
495 Get_Descriptor_Device[7]=0; # wLengthH
497 print "Fetching 8 bytes of Device Descriptor.";
498 self.ctl_read(Get_Descriptor_Device); # Get device descriptor into self.xfrdata;
499 self.maxPacketSize=self.xfrdata[7];
500 print "EP0 maxPacketSize is %02i bytes." % self.maxPacketSize;
502 # Issue another USB bus reset
503 print "Resetting the bus again."
504 self.wreg(rHCTL,bmBUSRST);
505 while self.rreg(rHCTL) & bmBUSRST:
506 #Wait for reset to complete.
510 # Set_Address to 7 (Note: this request goes to address 0, already set in PERADDR register).
511 print "Setting address to 0x07";
512 HR = self.ctl_write_nd(Set_Address_to_7); # CTL-Write, no data stage
513 #if(print_error(HR)) return;
515 time.sleep(0.002); # Device gets 2 msec recovery time
516 self.wreg(rPERADDR,7); # now all transfers go to addr 7
519 #Get the device descriptor at the assigned address.
520 Get_Descriptor_Device[6]=0x12; #Fill in real descriptor length.
521 print "Fetching Device Descriptor."
522 self.ctl_read(Get_Descriptor_Device); #Result in self.xfrdata;
524 self.descriptor=self.xfrdata;
525 self.VID = self.xfrdata[8] + 256*self.xfrdata[9];
526 self.PID = self.xfrdata[10]+ 256*self.xfrdata[11];
527 iMFG = self.xfrdata[14];
528 iPROD = self.xfrdata[15];
529 iSERIAL = self.xfrdata[16];
531 self.manufacturer=self.getDescriptorString(iMFG);
532 self.product=self.getDescriptorString(iPROD);
533 self.serial=self.getDescriptorString(iSERIAL);
537 def printstrings(self):
538 print "Vendor ID is %04x." % self.VID;
539 print "Product ID is %04x." % self.PID;
540 print "Manufacturer: %s" % self.manufacturer;
541 print "Product: %s" % self.product;
542 print "Serial: %s" % self.serial;
544 def getDescriptorString(self, index):
545 """Grabs a string from the descriptor string table."""
546 # Get_Descriptor-String template. Code fills in idx at str[2].
547 Get_Descriptor_String = [0x80,0x06,index,0x03,0x00,0x00,0x40,0x00];
549 if index==0: return "MISSING STRING";
551 status=self.ctl_read(Get_Descriptor_String);
552 if status: return None;
554 #Since we've got a string
556 for c in self.xfrdata[2:len(self.xfrdata)]:
557 if c>0: toret=toret+chr(c);
560 class GoodFETMAXUSBHID(GoodFETMAXUSB):
561 """This is an example HID keyboard driver, loosely based on the
564 """Initialize a USB HID device."""
565 self.usb_disconnect();
571 """Main loop of the USB HID emulator."""
572 print "Starting a HID device. This won't return.";
576 """Handle USB Enumeration"""
578 #Grab the SETUP packet from the buffer.
579 SUD=self.readbytes(rSUDFIFO,8);
581 #Parse the SETUP packet
582 print "Handling a setup packet of %s" % self.setup2str(SUD);
584 setuptype=(ord(SUD[bmRequestType])&0x60);
586 self.std_request(SUD);
587 elif setuptype==0x20:
588 self.class_request(SUD);
589 elif setuptype==0x40:
590 self.vendor_request(SUD);
592 print "Unknown request type 0x%02x." % ord(SUD[bmRequestType])
594 def class_request(self,SUD):
595 """Handle a class request."""
596 print "Stalling a class request.";
598 def vendor_request(self,SUD):
599 print "Stalling a vendor request.";
601 def std_request(self,SUD):
602 """Handles a standard setup request."""
603 setuptype=ord(SUD[bRequest]);
604 if setuptype==SR_GET_DESCRIPTOR: self.send_descriptor(SUD);
605 #elif setuptype==SR_SET_FEATURE: self.feature(1);
606 elif setuptype==SR_SET_CONFIGURATION: self.set_configuration(SUD);
607 elif setuptype==SR_GET_STATUS: self.get_status(SUD);
608 elif setuptype==SR_SET_ADDRESS: self.rregAS(rFNADDR);
609 elif setuptype==SR_GET_INTERFACE: self.get_interface(SUD);
611 print "Stalling Unknown standard setup request type %02x" % setuptype;
615 def get_interface(self,SUD):
616 """Handles a setup request for SR_GET_INTERFACE."""
617 if ord(SUD[wIndexL]==0):
618 self.wreg(rEP0FIFO,0);
619 self.wregAS(rEP0BC,1);
624 DD=[0x12, # bLength = 18d
625 0x01, # bDescriptorType = Device (1)
626 0x00,0x01, # bcdUSB(L/H) USB spec rev (BCD)
627 0x00,0x00,0x00, # bDeviceClass, bDeviceSubClass, bDeviceProtocol
628 0x40, # bMaxPacketSize0 EP0 is 64 bytes
629 0x6A,0x0B, # idVendor(L/H)--Maxim is 0B6A
630 0x46,0x53, # idProduct(L/H)--5346
631 0x34,0x12, # bcdDevice--1234
632 1,2,3, # iManufacturer, iProduct, iSerialNumber
634 #Configuration Descriptor
636 0x02, # bDescriptorType = Config
637 0x22,0x00, # wTotalLength(L/H) = 34 bytes
638 0x01, # bNumInterfaces
640 0x00, # iConfiguration
641 0xE0, # bmAttributes. b7=1 b6=self-powered b5=RWU supported
642 0x01, # MaxPower is 2 ma
643 # INTERFACE Descriptor
647 0x00, # bAlternate Setting
648 0x01, # bNum Endpoints
649 0x03, # bInterfaceClass = HID
650 0x00,0x00, # bInterfaceSubClass, bInterfaceProtocol
652 # HID Descriptor--It's at CD[18]
654 0x21, # bDescriptorType = HID
655 0x10,0x01, # bcdHID(L/H) Rev 1.1
656 0x00, # bCountryCode (none)
657 0x01, # bNumDescriptors (one report descriptor)
658 0x22, # bDescriptorType (report)
659 43,0, # CD[25]: wDescriptorLength(L/H) (report descriptor size is 43 bytes)
660 # Endpoint Descriptor
662 0x05, # bDescriptorType (Endpoint)
663 0x83, # bEndpointAddress (EP3-IN)
664 0x03, # bmAttributes (interrupt)
665 64,0, # wMaxPacketSize (64)
668 # STRING descriptor 0--Language string
672 # 0x03, # bDescriptorType = string
673 # 0x09,0x04 # wLANGID(L/H) = English-United Sates
675 # STRING descriptor 1--Manufacturer ID
676 "\x0c\x03M\x00a\x00x\x00i\x00m\x00",
679 # 0x03, # bDescriptorType = string
680 # 'M',0,'a',0,'x',0,'i',0,'m',0 # text in Unicode
682 # STRING descriptor 2 - Product ID
683 "\x18\x03M\x00A\x00X\x003\x004\x002\x000\x00E\x00 \x00E\x00n\x00u\x00m\x00 \x00C\x00o\x00d\x00e\x00",
685 # 0x03, # bDescriptorType = string
686 # 'M',0,'A',0,'X',0,'3',0,'4',0,'2',0,'0',0,'E',0,' ',0,
687 # 'E',0,'n',0,'u',0,'m',0,' ',0,'C',0,'o',0,'d',0,'e',0
691 # STRING descriptor 3 - Serial Number ID
692 "\x14\x03S\x00/\x00N\x00 \x003\x004\x002\x000\x00E\x00"
694 # 0x03, # bDescriptorType = string
707 0x05,0x01, # Usage Page (generic desktop)
708 0x09,0x06, # Usage (keyboard)
709 0xA1,0x01, # Collection
710 0x05,0x07, # Usage Page 7 (keyboard/keypad)
711 0x19,0xE0, # Usage Minimum = 224
712 0x29,0xE7, # Usage Maximum = 231
713 0x15,0x00, # Logical Minimum = 0
714 0x25,0x01, # Logical Maximum = 1
715 0x75,0x01, # Report Size = 1
716 0x95,0x08, # Report Count = 8
717 0x81,0x02, # Input(Data,Variable,Absolute)
718 0x95,0x01, # Report Count = 1
719 0x75,0x08, # Report Size = 8
720 0x81,0x01, # Input(Constant)
721 0x19,0x00, # Usage Minimum = 0
722 0x29,0x65, # Usage Maximum = 101
723 0x15,0x00, # Logical Minimum = 0,
724 0x25,0x65, # Logical Maximum = 101
725 0x75,0x08, # Report Size = 8
726 0x95,0x01, # Report Count = 1
727 0x81,0x00, # Input(Data,Variable,Array)
729 def send_descriptor(self,SUD):
730 """Send the USB descriptors based upon the setup data."""
732 reqlen=ord(SUD[wLengthL])+256*ord(SUD[wLengthH]); #16-bit length
733 desctype=ord(SUD[wValueH]);
735 if desctype==GD_DEVICE:
738 elif desctype==GD_CONFIGURATION:
741 elif desctype==GD_STRING:
742 desclen=self.strDesc[ord(SUD[wValueL])][0];
743 ddata=self.strDesc[ord(SUD[wValueL])];
744 elif desctype==GD_REPORT:
748 #TODO Configuration, String, Hid, and Report
751 sendlen=min(reqlen,desclen);
752 self.writebytes(rEP0FIFO,ddata);
753 self.wregAS(rEP0BC,sendlen);
755 print "Stalling in send_descriptor() for lack of handler for %02x." % desctype;
757 def set_configuration(self,SUD):
758 """Set the configuration."""
760 configval=ord(SUD[wValueL]);
762 self.SETBIT(rUSBIEN,bmSUSPIE);
763 self.rregAS(rFNADDR);
764 def get_status(self,SUD):
765 """Get the USB Setup Status."""
766 testbyte=ord(SUD[bmRequestType])
770 self.wreg(rEP0FIFO,0x03); #Enable RWU and self-powered
771 self.wreg(rEP0FIFO,0x00); #Second byte is always zero.
772 self.wregAS(rEP0BC,2); #Load byte count, arm transfer, and ack CTL.
775 self.wreg(rEP0FIFO,0x00);
776 self.wreg(rEP0FIFO,0x00); #Second byte is always zero.
777 self.wregAS(rEP0BC,2);
780 if(ord(SUD[wIndexL])==0x83):
781 self.wreg(rEP0FIFO,0x01); #Stall EP3
782 self.wreg(rEP0FIFO,0x00); #Second byte is always zero.
783 self.wregAS(rEP0BC,2);
788 def service_irqs(self):
789 """Handle USB interrupt events."""
791 epirq=self.rreg(rEPIRQ);
792 usbirq=self.rreg(rUSBIRQ);
794 #Are we being asked for setup data?
795 if(epirq&bmSUDAVIRQ): #Setup Data Requested
796 self.wreg(rEPIRQ,bmSUDAVIRQ); #Clear the bit
798 if(epirq&bmIN3BAVIRQ): #EN3-IN packet
803 typestring=" Python does USB HID!";
806 def asc2hid(self,ascii):
807 """Translate ASCII to an USB keycode."""
809 if a>='a' and a<='z':
810 return ord(a)-ord('a')+4;
811 elif a>='A' and a<='Z':
812 return ord(a)-ord('A')+4;
818 """Type next letter in buffer."""
819 if self.typepos>=len(self.typestring):
821 elif self.typephase==0:
826 self.typeletter(self.typestring[self.typepos]);
827 self.typepos=self.typepos+1;
829 def typeletter(self,key):
830 """Type a letter on IN3. Zero for keyup."""
831 #if type(key)==str: key=ord(key);
833 self.wreg(rEP3INFIFO,0);
834 self.wreg(rEP3INFIFO,0);
835 self.wreg(rEP3INFIFO,self.asc2hid(key));
836 self.wreg(rEP3INBC,3);
838 """Handle IN3 event."""
839 #Don't bother clearing interrupt flag, that's done by sending the reply.