git.rot13.org Git - goodfet/blob - client/GoodFETNRF.py

   1 #!/usr/bin/env python
   2 # GoodFET Nordic RF Radio Client
   3 #
   4 # (C) 2009 Travis Goodspeed <travis at radiantmachines.com>
   5 #
   6 # This code is being rewritten and refactored.  You've been warned!
   7
   8 import sys, time, string, cStringIO, struct, glob, serial, os;
   9
  10 from GoodFET import GoodFET;
  11
  12 class GoodFETNRF(GoodFET):
  13     NRFAPP=0x50;
  14     def NRFsetup(self):
  15         """Move the FET into the NRF application."""
  16         self.writecmd(self.NRFAPP,0x10,0,self.data); #NRF/SETUP
  17
  18     def NRFtrans8(self,byte):
  19         """Read and write 8 bits by NRF."""
  20         data=self.NRFtrans([byte]);
  21         return ord(data[0]);
  22
  23     def NRFtrans(self,data):
  24         """Exchange data by NRF."""
  25         self.data=data;
  26         self.writecmd(self.NRFAPP,0x00,len(data),data);
  27         return self.data;
  28
  29     def peek(self,reg,bytes=1):
  30         """Read an NRF Register.  For long regs, result is flipped."""
  31         data=[reg,0,0,0,0,0];
  32         self.writecmd(self.NRFAPP,0x02,len(data),data);
  33         toret=0;
  34         for i in range(0,bytes):
  35             toret=toret|(ord(self.data[i+1])<<(8*i));
  36         return toret;
  37     def poke(self,reg,val,bytes=1):
  38         """Write an NRF Register."""
  39         data=[reg];
  40         for i in range(0,bytes):
  41             data=data+[(val>>(8*i))&0xFF];
  42         self.writecmd(self.NRFAPP,0x03,len(data),data);
  43         if self.peek(reg,bytes)!=val and reg!=0x07:
  44             print "Warning, failed to set register %02x." %reg;
  45         return;
  46
  47     def status(self):
  48         """Read the status byte."""
  49         status=self.peek(0x07);
  50         print "Status=%02x" % status;
  51
  52     #Radio stuff begins here.
  53     def RF_freq(self,frequency):
  54         """Set the frequency in Hz."""
  55
  56         #On the NRF24L01+, register 0x05 is the offset in
  57         #MHz above 2400.
  58
  59         mhz=frequency/1000000-2400;
  60         print "Setting channel %i." % mhz
  61         self.poke(0x05,mhz);
  62     def RF_getsmac(self):
  63         """Return the source MAC address."""
  64
  65         #Register 0A is RX_ADDR_P0, five bytes.
  66         mac=self.peek(0x0A, 5);
  67         return mac;
  68     def RF_setsmac(self,mac):
  69         """Set the source MAC address."""
  70
  71         #Register 0A is RX_ADDR_P0, five bytes.
  72         self.poke(0x0A, mac, 5);
  73         return mac;
  74     def RF_gettmac(self):
  75         """Return the target MAC address."""
  76
  77         #Register 0x10 is TX_ADDR, five bytes.
  78         mac=self.peek(0x0A, 5);
  79         return mac;
  80     def RF_settmac(self,mac):
  81         """Set the target MAC address."""
  82
  83         #Register 0x10 is TX_ADDR, five bytes.
  84         self.poke(0x10, mac, 5);
  85         return mac;
  86     def RF_rxpacket(self):
  87         """Get a packet from the radio.  Returns None if none is waiting."""
  88         if self.peek(0x07) & 0x40:
  89             #Packet has arrived.
  90             self.writecmd(self.NRFAPP,0x80,0,None); #RX Packet
  91             data=self.data;
  92             self.poke(0x07,0x40);#clear bit.
  93             return data;
  94         elif self.peek(0x07)==0:
  95             self.writecmd(self.NRFAPP,0x82,0,None); #Flush
  96             self.poke(0x07,0x40);#clear bit.
  97         return None;
  98     packetlen=16;
  99     def RF_setpacketlen(self,len=16):
 100         """Set the number of bytes in the expected payload."""
 101         self.poke(0x11,len);
 102         self.packetlen=len;