More EM260 code. RNG works only after another board has initialized the chip.

[goodfet] / client / GoodFETEM260.py

diff --git a/client/GoodFETEM260.py b/client/GoodFETEM260.py
index edee5b2..6bfb1ed 100644 (file)
--- a/client/GoodFETEM260.py
+++ b/client/GoodFETEM260.py
@@ -22,25 +22,106 @@ from GoodFETSPI import GoodFETSPI;
 
 class GoodFETEM260(GoodFETSPI):
     EM260APP=0x01;
+    seq=0;
+    def EM260trans(self,data,retry=1):
+        """Exchange data by EM260 SPI. (Slightly nonstandard.)"""
+        
+        if retry==0:
+            #Retries exceeded.  Send a trivial command to clear error.
+            data=[0x0A,0xA7];
+        self.writecmd(0x01,0x82,len(data),data);
+        
+        
+        try:
+            reply=ord(self.data[0]);
+            if(reply==0x00):
+                #print "Warning: EM260 rebooted.";
+                return self.EM260trans(data,retry-1);
+            if(reply==0x02):
+                #print "Error: Aborted Transaction.";
+                return self.EM260trans(data,retry-1);
+            if(reply==0x03):
+                print "Error: Missing Frame Terminator.";
+                return self.data;
+            if(reply==0x04):
+                print "Error: Reserved Error.  (Access denied?)";
+                return self.data;
+        except:
+            print "Error in EM260trans.";
+        return self.data;
+    
+    def EZSPtrans(self,frame):
+        """Send an EZSP frame."""
+        data=self.EM260trans([0xFE,len(frame)+2,
+                              self.seq&0xFF,0x00,
+                              ]+frame+[
+                              0xA7]);
+        #s="EZSP< ";
+        #for foo in data:
+        #    s=s+"%02x " % ord(foo);
+        #print s;
+        
+        if ord(data[0])!=0xFE:
+            print "EZSP error: 0x%02x" % ord(data[0]);
+        if ord(data[4])==0x58:
+            print "EZSP Invalid Command";
+            return None;
+        if frame[0]!=ord(data[4]):
+            print "EZSP warning: Command 0x%02x returned type 0x%02x." % (
+                frame[0],ord(data[4]));
+        self.seq=self.seq+1;
+        return data;
+        
     def peek8(self,adr):
+        """Read a byte from the given address.  Untested."""
+        
+        data=self.EZSPtrans([0x47,adr&0xFF,10]);
+        
+        return ord(data[6]);
+    def poke8(self,adr,val):
+        """Poke a value into RAM.  Untested"""
+        self.EZSPtrans([0x46,adr&0xFF,1,val&0xFF]);
+        return val;
+    def rand16(self):
         """Read a byte from the given address."""
-        data=self.SPItrans([0xfe,0x01,0x00,
-                            0x49,
-                            0xA7,0,0,0,0,0,0,0,0]);
-        return ord(data[7]);
-    def poke8(self,adr, byte):
-        """Poke a byte to the given address."""
+        
+        data=self.EZSPtrans([0x49]);
+        if data==None:
+            print "Insufficient random data.";
+            return 0;
+        return ord(data[6])+(ord(data[7])<<8);
+    
     def info(self):
         """Read the info bytes."""
-        data=self.SPItrans([0x0B,0xA7,
-                            0xFF,
-                            0xFF,0xFF,0xFF,     #00 02 A7
-                            0,0,0,0,0,0,0,0,0,0,
-                            0,0,0,0,0,0,0,0,0,0,
-                            0,0,0,0,0,0,0,0,0,0,
-                            0,0,0,0,0,0,0,0,0,0,
-                            0,0,0,0,0,0,0,0,0,0,
-                            0,0,0,0,0,0,0,0,0,0
-                            ]); 
-        for foo in data:
-            print "%02x" % ord(foo);
+        print "Ember EM26 Z-Stack SPI Module.";
+        version=self.EM260spiversion();
+        status=self.EM260spistatus();
+        print "Version: %i" % (version); 
+        print "Status:  %s" % (["dead","alive"][status]);
+    def EM260spiversion(self):
+        """Read the SPI version number from EM260."""
+        data=self.EM260trans([0x0A,0xA7]);        
+        version=ord(data[0]);
+        
+        if version==0x00:
+            return self.EM260spiversion();
+        if version==0x02:
+            return self.EM260spiversion();
+        if not version&0x80:
+            print "Version misread.";
+            return 0;
+        return version&0x7F;
+    
+    def EM260spistatus(self):
+        """Read the status bit."""
+        data=self.EM260trans([0x0B,0xA7]);
+        status=ord(data[0]);
+        
+        if status==0x00:
+            return self.EM260spistatus();
+        if status==0x02:
+            return self.EM260spistatus();
+        if not status&0x80 and status&0x40:
+            print "Status misread.";
+            return 0;
+        return status&1;