+ self.serialport.setTimeout(12);
+ def telosSetSCL(self, level):
+ self.serialport.setRTS(not level)
+ def telosSetSDA(self, level):
+ self.serialport.setDTR(not level)
+
+ def telosI2CStart(self):
+ self.telosSetSDA(1)
+ self.telosSetSCL(1)
+ self.telosSetSDA(0)
+
+ def telosI2CStop(self):
+ self.telosSetSDA(0)
+ self.telosSetSCL(1)
+ self.telosSetSDA(1)
+
+ def telosI2CWriteBit(self, bit):
+ self.telosSetSCL(0)
+ self.telosSetSDA(bit)
+ time.sleep(2e-6)
+ self.telosSetSCL(1)
+ time.sleep(1e-6)
+ self.telosSetSCL(0)
+
+ def telosI2CWriteByte(self, byte):
+ self.telosI2CWriteBit( byte & 0x80 );
+ self.telosI2CWriteBit( byte & 0x40 );
+ self.telosI2CWriteBit( byte & 0x20 );
+ self.telosI2CWriteBit( byte & 0x10 );
+ self.telosI2CWriteBit( byte & 0x08 );
+ self.telosI2CWriteBit( byte & 0x04 );
+ self.telosI2CWriteBit( byte & 0x02 );
+ self.telosI2CWriteBit( byte & 0x01 );
+ self.telosI2CWriteBit( 0 ); # "acknowledge"
+
+ def telosI2CWriteCmd(self, addr, cmdbyte):
+ self.telosI2CStart()
+ self.telosI2CWriteByte( 0x90 | (addr << 1) )
+ self.telosI2CWriteByte( cmdbyte )
+ self.telosI2CStop()
+
+ def telosBReset(self,invokeBSL=0):
+ # "BSL entry sequence at dedicated JTAG pins"
+ # rst !s0: 0 0 0 0 1 1
+ # tck !s1: 1 0 1 0 0 1
+ # s0|s1: 1 3 1 3 2 0
+
+ # "BSL entry sequence at shared JTAG pins"
+ # rst !s0: 0 0 0 0 1 1
+ # tck !s1: 0 1 0 1 1 0
+ # s0|s1: 3 1 3 1 0 2
+
+ if invokeBSL:
+ self.telosI2CWriteCmd(0,1)
+ self.telosI2CWriteCmd(0,3)
+ self.telosI2CWriteCmd(0,1)
+ self.telosI2CWriteCmd(0,3)
+ self.telosI2CWriteCmd(0,2)
+ self.telosI2CWriteCmd(0,0)
+ else:
+ self.telosI2CWriteCmd(0,3)
+ self.telosI2CWriteCmd(0,2)
+
+ # This line was not defined inside the else: block, not sure where it
+ # should be however
+ self.telosI2CWriteCmd(0,0)
+ time.sleep(0.250) #give MSP430's oscillator time to stabilize
+ self.serialport.flushInput() #clear buffers
+
+