2 # GoodFET EM260 Radio Client
4 # (C) 2010 Travis Goodspeed <travis at radiantmachines.com>
6 # This code is being rewritten and refactored. You've been warned!
8 # The EM260 is almost textbook SPI, except that the response cannot be
9 # read until after the nHOST_INT pin of the EM260 drops low and a dummy
10 # byte is read. That is, the sequence will look like the following:
12 # Transmit Host->Slave Data
13 # while(nHOST_INT); //Sleep until ready.
15 # Recv Slave->Host Data
17 # The delay is mandatory.
19 import sys, time, string, cStringIO, struct, glob, serial, os;
21 from GoodFETSPI import GoodFETSPI;
23 class GoodFETEM260(GoodFETSPI):
26 def EM260trans(self,data,retry=1):
27 """Exchange data by EM260 SPI. (Slightly nonstandard.)"""
30 #Retries exceeded. Send a trivial command to clear error.
32 self.writecmd(0x01,0x82,len(data),data);
36 reply=ord(self.data[0]);
38 #print "Warning: EM260 rebooted.";
39 return self.EM260trans(data,retry-1);
41 #print "Error: Aborted Transaction.";
42 return self.EM260trans(data,retry-1);
44 print "Error: Missing Frame Terminator.";
47 print "Error: Reserved Error. (Access denied?)";
50 print "Error in EM260trans.";
53 def EZSPtrans(self,frame):
54 """Send an EZSP frame."""
55 data=self.EM260trans([0xFE,len(frame)+2,
61 # s=s+"%02x " % ord(foo);
63 if ord(data[0])!=0xFE:
64 print "EZSP error: 0x%02x" % ord(data[0]);
65 if frame[0]!=ord(data[4]):
66 print "EZSP warning: Command 0x%02x returned type 0x%02x." % (
67 frame[0],ord(data[4]));
73 """Read a byte from the given address."""
75 data=self.EZSPtrans([0x47,adr&0xFF]);
80 """Read a byte from the given address."""
82 data=self.EZSPtrans([0x49]);
83 return ord(data[6])+(ord(data[7])<<8);
86 """Read the info bytes."""
87 print "Ember EM26 Z-Stack SPI Module.";
88 version=self.EM260spiversion();
89 status=self.EM260spistatus();
90 print "Version: %i" % (version);
91 print "Status: %s" % (["dead","alive"][status]);
92 def EM260spiversion(self):
93 """Read the SPI version number from EM260."""
94 data=self.EM260trans([0x0A,0xA7]);
98 return self.EM260spiversion();
100 return self.EM260spiversion();
102 print "Version misread.";
106 def EM260spistatus(self):
107 """Read the status bit."""
108 data=self.EM260trans([0x0B,0xA7]);
112 return self.EM260spistatus();
114 return self.EM260spistatus();
115 if not status&0x80 and status&0x40:
116 print "Status misread.";