On Tue, 2004-12-14 at 18:31, ouz as wrote: > i have an electronic module which only understand binary data. > i use python pyserial. > for example the module starts when 001000000 8-bit binary data sent.but > pyserial sent only string data. > Can i send this binary data with pyserial or another way with python.
Strings can be considered binary data, where each character represents eight bits. Simply build the binary data however you're most comfortable (a list of bytes; a list of bits; a string representation of a binary numer, an 8-bit string used as a buffer; whatever) then compose into a string and send. >>> bits = '0101101110111101' >>> bytes = [ mybits[i*8:(i+1)*8] for i in range(len(mybits)/8) ] >>> bytechars = [ chr(int(x,2)) for x in bytes ] >>> bytestr = ''.join(bytechars) >>> bytestr '[\xbd' Obviously, you could tidy up that conversion a little. This being Python, I wouldn't be surprised if there was a built-in function to do the conversion ;-) . You can choose to represent your binary data in many ways: >>> bits = '0101101110111101' >>> truthlist = [ int(x) and True or False for x in mybits ] >>> truthlist [False, True, False, True, True, False, True, True, True, False, True, True, True, True, False, True] >>> hexstring = "0x%x" % int(mybits,2) >>> hexstring '0x5bbd' >>> hexstring2 = "\x5b\xbd" >>> hexstring2 '[\xbd' and you can convert them all to strings. Just remember that you can work with a string as a buffer of 8-bit blocks and you'll be fine. In your specific example: >>> byte = '001000000' >>> byte_chr = chr(int(byte,2)) >>> byte_chr '@' -- Craig Ringer -- http://mail.python.org/mailman/listinfo/python-list
