X-Git-Url: https://defiant.homedns.org/gitweb/?a=blobdiff_plain;f=bus_pirate.py;h=d7c8eaf0d483df61e87b463df04db1a0a8c2d868;hb=d75dcf78890558e4b8e2ded3d734f769c217e0ef;hp=aa7d51bf2494e541fdb0b4309e8638898475fa58;hpb=8a303341088f5fc6de845a800510942e0788493f;p=pyshared.git

diff --git a/bus_pirate.py b/bus_pirate.py
index aa7d51b..d7c8eaf 100644
--- a/bus_pirate.py
+++ b/bus_pirate.py
@@ -3,6 +3,7 @@
 
 import serial
 import struct
+import threading
 
 dPinToBit = {
 		"POWER": 6,
@@ -18,14 +19,16 @@ dPinToBit = {
 # http://dangerousprototypes.com/docs/SPI_(binary)
 class BP:
 	def __init__(self, sDevice):
+		self.lock = threading.Lock()
 		self.pSerial = serial.Serial(sDevice, baudrate=115200, timeout=0.1)
 		self.mode_bit_bang()
 		self.io_state = 0
 		self.io_dir = 0
 
 	def command(self, cmd, num_read):
-		self.pSerial.write(cmd)
-		return self.pSerial.read(num_read)
+		with self.lock:
+			self.pSerial.write(cmd)
+			return self.pSerial.read(num_read)
 
 	def mode_bit_bang(self):
 		for i in range(20):
@@ -64,6 +67,29 @@ class BP:
 		v = struct.unpack(">h", s)
 		return v[0]/1024.0*6.6
 
+	# http://codepad.org/qtYpZmIF
+	def pwm(self, freq, duty_cycle_percent):
+		lPrescaler = {0:1, 1:8 , 2:64, 3:256}
+		Fosc = 32e6
+		Tcy = 2.0 / Fosc
+		period = 1.0 / freq
+		prescaler = 1
+
+		# find needed prescaler
+		for i in range(4):
+			prescaler = lPrescaler[i]
+			PRy = period * 1.0 / (Tcy * prescaler)
+			PRy = int(PRy - 1)
+			OCR = int(PRy * duty_cycle_percent)
+
+			if PRy < (2 ** 16 - 1):
+				break # valid value for PRy, keep values
+
+		cmd = struct.pack(">BBHH", 0b00010010, i, OCR, PRy)
+		ret = self.command(cmd, 1)
+		if ord(ret) != 0x1:
+			raise Exception()
+
 	def spi_command(self, cmd):
 		ret = self.command(cmd, 1)
 		if ord(ret) != 0x1:
@@ -106,3 +132,57 @@ class BP:
 			raise Exception("Bad I/O pin")
 		state = self.update_io()
 		return state & (1 << dPinToBit[pin])
+
+	def mode_i2c(self, bEnablePower=False, bEnablePullup=False, iSpeedkHz=100):
+		if self.command(chr(0x2), 4) != "I2C1":
+			raise Exception()
+
+		dSpeeds = {
+			5: 0x0,
+			50: 0x1,
+			100: 0x2,
+			400: 0x3,
+		}
+		if iSpeedkHz not in dSpeeds.keys():
+			raise Exception("Invalid I2C speed")
+		ret = self.command(chr(0b01100000 | dSpeeds[iSpeedkHz]), 1)
+		if ord(ret) != 0x1:
+			raise Exception()
+
+		periphals = 0b01000000
+		if bEnablePower:
+			periphals |= (1<<3)
+		if bEnablePullup:
+			periphals |= (1<<2)
+		ret = self.command(chr(periphals), 1)
+		if ord(ret) != 0x1:
+			raise Exception()
+
+	def i2c_write(self, addr, reg, s):
+		# 1. Write
+		# command (1) | number of write bytes (2) | number of read bytes (2) | bytes to write (0..)
+		msg = struct.pack(">BHHBB%ds" % len(s), 0x08, 2+len(s), 0, addr, reg, s)
+		ret = self.command(msg, 1)
+
+		if ord(ret[0]) != 0x1:
+			raise Exception("I2C write error")
+
+	def i2c_read(self, addr, reg, num_read):
+		# set reg
+		self.i2c_write(addr, reg, "")
+
+		# command (1) | number of write bytes (2) | number of read bytes (2) | bytes to write (0..)
+		msg = struct.pack(">BHHB", 0x08, 1, num_read, addr | 0x1)
+		ret = self.command(msg, 1 + num_read)
+
+		if ord(ret[0]) != 0x1:
+			raise Exception("I2C read error")
+
+		return ret[1:]
+
+	def i2c_search(self):
+		for i in range(128):
+			msg = struct.pack(">BHHB", 0x08, 1, 1, i)
+			ret = self.command(msg, 1)
+			if ord(ret) == 0x1:
+				print "Found I2C Addr: 0x%x" % (i & ~0x1)