X-Git-Url: https://defiant.homedns.org/gitweb/?a=blobdiff_plain;f=bus_pirate.py;h=02f3fb8211024a29eb0165be158aef32be520d82;hb=refs%2Fheads%2Fmaster;hp=d7c8eaf0d483df61e87b463df04db1a0a8c2d868;hpb=d75dcf78890558e4b8e2ded3d734f769c217e0ef;p=pyshared.git

diff --git a/bus_pirate.py b/bus_pirate.py
index d7c8eaf..02f3fb8 100644
--- a/bus_pirate.py
+++ b/bus_pirate.py
@@ -158,6 +158,15 @@ class BP:
 		if ord(ret) != 0x1:
 			raise Exception()
 
+	def i2c_ping(self, addr):
+		# 1. Write
+		# command (1) | number of write bytes (2) | number of read bytes (2) | bytes to write (0..)
+		msg = struct.pack(">BHHB", 0x08, 1, 0, addr)
+		ret = self.command(msg, 1)
+
+		if ord(ret[0]) != 0x1:
+			raise Exception("I2C ping failed")
+
 	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..)
@@ -169,7 +178,8 @@ class BP:
 
 	def i2c_read(self, addr, reg, num_read):
 		# set reg
-		self.i2c_write(addr, reg, "")
+		if reg != None:
+			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)