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
  33         #Automatically calibrate the len.
  34         if bytes==-1:
  35             bytes=1;
  36             if reg==0x0a or reg==0x0b or reg==0x10: bytes=5;
  37
  38         self.writecmd(self.NRFAPP,0x02,len(data),data);
  39         toret=0;
  40         for i in range(0,bytes):
  41             toret=toret|(ord(self.data[i+1])<<(8*i));
  42         return toret;
  43     def poke(self,reg,val,bytes=-1):
  44         """Write an NRF Register."""
  45         data=[reg];
  46
  47         #Automatically calibrate the len.
  48         if bytes==-1:
  49             bytes=1;
  50             if reg==0x0a or reg==0x0b or reg==0x10: bytes=5;
  51
  52         for i in range(0,bytes):
  53             data=data+[(val>>(8*i))&0xFF];
  54         self.writecmd(self.NRFAPP,0x03,len(data),data);
  55         if self.peek(reg,bytes)!=val and reg!=0x07:
  56             print "Warning, failed to set r%02x=%02x, got %02x." %(reg,
  57                                                                  val,
  58                                                                  self.peek(reg,bytes));
  59         return;
  60
  61     def status(self):
  62         """Read the status byte."""
  63         status=self.peek(0x07);
  64         print "Status=%02x" % status;
  65
  66     #Radio stuff begins here.
  67     def RF_setenc(self,code="GFSK"):
  68         """Set the encoding type."""
  69         if code!=GFSK:
  70             return "%s not supported by the NRF24L01.  Try GFSK."
  71         return;
  72     def RF_getenc(self):
  73         """Get the encoding type."""
  74         return "GFSK";
  75     def RF_getrate(self):
  76         rate=self.peek(0x06)&0x28;
  77         if rate==0x28:
  78             rate=250*10**3; #256kbps
  79         elif rate==0x08:
  80             rate=2*10**6;  #2Mbps
  81         elif rate==0x00:
  82             rate=1*10**6;  #1Mbps
  83         return rate;
  84     def RF_setrate(self,rate=2*10**6):
  85         r6=self.peek(0x06); #RF_SETUP register
  86         r6=r6&(~0x28);   #Clear rate fields.
  87         if rate==2*10**6:
  88             r6=r6|0x08;
  89         elif rate==1*10**6:
  90             r6=r6;
  91         elif rate==250*10**3:
  92             r6=r6|0x20;
  93         print "Setting r6=%02x." % r6;
  94         self.poke(0x06,r6); #Write new rate.
  95     def RF_setfreq(self,frequency):
  96         """Set the frequency in Hz."""
  97
  98         #On the NRF24L01+, register 0x05 is the offset in
  99         #MHz above 2400.
 100
 101         chan=frequency/1000000-2400;
 102         self.poke(0x05,chan);
 103
 104
 105     def RF_getfreq(self):
 106         """Get the frequency in Hz."""
 107
 108         #On the NRF24L01+, register 0x05 is the offset in
 109         #MHz above 2400.
 110
 111         return (2400+self.peek(0x05))*10**6
 112         self.poke(0x05,chan);
 113     def RF_getsmac(self):
 114         """Return the source MAC address."""
 115
 116         #Register 0A is RX_ADDR_P0, five bytes.
 117         mac=self.peek(0x0A, 5);
 118         return mac;
 119     def RF_setsmac(self,mac):
 120         """Set the source MAC address."""
 121
 122         #Register 0A is RX_ADDR_P0, five bytes.
 123         self.poke(0x0A, mac, 5);
 124         return mac;
 125     def RF_gettmac(self):
 126         """Return the target MAC address."""
 127
 128         #Register 0x10 is TX_ADDR, five bytes.
 129         mac=self.peek(0x10, 5);
 130         return mac;
 131     def RF_settmac(self,mac):
 132         """Set the target MAC address."""
 133
 134         #Register 0x10 is TX_ADDR, five bytes.
 135         self.poke(0x10, mac, 5);
 136         return mac;
 137
 138     def RF_rxpacket(self):
 139         """Get a packet from the radio.  Returns None if none is waiting."""
 140         if self.peek(0x07) & 0x40:
 141             #Packet has arrived.
 142             self.writecmd(self.NRFAPP,0x80,0,None); #RX Packet
 143             data=self.data;
 144             self.poke(0x07,0x40);#clear bit.
 145             return data;
 146         elif self.peek(0x07)==0:
 147             self.writecmd(self.NRFAPP,0x82,0,None); #Flush
 148             self.poke(0x07,0x40);#clear bit.
 149         return None;
 150     def RF_txpacket(self,payload):
 151         """Transmit a packet.  Untested."""
 152         if self.peek(0x07) & 0x40:
 153             #Packet has arrived.
 154             self.writecmd(self.NRFAPP,0x81,0,None); #RX Packet
 155             data=self.data;
 156             self.poke(0x07,0x40);#clear bit.
 157             return data;
 158         elif self.peek(0x07)==0:
 159             self.writecmd(self.NRFAPP,0x83,0,None); #Flush
 160             self.poke(0x07,0x40);#clear bit.
 161         return None;
 162
 163     def RF_carrier(self):
 164         """Hold a carrier wave on the present frequency."""
 165         # Set CONT_WAVE, PLL_LOCK, and 0dBm in RF_SETUP
 166         self.poke(0x06,8+10+4+2);
 167
 168     packetlen=16;
 169     def RF_setpacketlen(self,len=16):
 170         """Set the number of bytes in the expected payload."""
 171         self.poke(0x11,len);
 172         self.packetlen=len;
 173     def RF_getpacketlen(self):
 174         """Set the number of bytes in the expected payload."""
 175         len=self.peek(0x11);
 176         self.packetlen=len;
 177         return len;
 178     maclen=5;
 179     def RF_getmaclen(self):
 180         """Get the number of bytes in the MAC address."""
 181         choices=[0, 3, 4, 5];
 182         choice=self.peek(0x03)&3;
 183         self.maclen=choices[choice];
 184         return self.maclen;
 185     def RF_setmaclen(self,len):
 186         """Set the number of bytes in the MAC address."""
 187         choices=["illegal", "illegal", "illegal",
 188                  1, 2, 3];
 189         choice=choices[len];
 190         self.poke(0x03,choice);
 191         self.maclen=len;