Beefy Boxes and Bandwidth Generously Provided by pair Networks
more useful options
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
So it's really this line self.DEVICE_REG_DATA &= ~(0x1<<0) that's causing my trouble.
This is just a wild guess since I don't know python, but I suspect it clears the least significant bit of the value stored in the DEVICE_REG_DATA variable.

The &= looks like a read-modify-write register operation. My guess is that &= is the AND-EQUAL bit-wise operator and ~ is the bit-wise negation operator. (0x1 << 0) is simplified as 0x1, which is represented in binary format as 0000_0001 (8 bits). 0000_0001 negated is 1111_1110. So the line is probably equivalent to the pseudo-code:

self.DEVICE_REG_DATA = self.DEVICE_REG_DATA & 1111_1110

UPDATE: Added note to explicitly state that the code example I gave is pseudo.


In reply to Re: I2C help (from python) by toolic
in thread I2C help (from python) by packetstormer

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others surveying the Monastery: (5)
As of 2024-04-23 23:28 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found