Actions
Forum Thread Details
  • Replies 6 replies
  • Subscribers 391 subscribers
  • Views 1336 views
  • Users 0 members are here
Related

Atmega 8bit port read and write

billpenner

All I have been able to read (except datasheet) seem to use individual pins on the MPU as serial ports only. Is it possible to store the data on a port as a byte.

The data sheet appears to have a register attached to each 8bit port. if the port could be read, then moved to a register for processing,  ie. add, mult, divide etc.

It would help me with my current project. Mnemonic instructions in the data sheet seem to do just that but I can find no reference how to use them in the Arduino referen

any help will be most appreciated.

Bill

Parents

  • Bill,

         I can't locate the article I was thinking of to reply to your question.  However, what you need to do is Google is "Arduino port bit manipulation".  I am sure you will find numerous articles but what you are looking for is how to directly manipulate, read or set the port values.  Basically these use AVR code at a level the Arduino IDE shields you from.  These direct instructions are very fast and you can manipulate the whole port at once.  You also need to be mindful of how the actual ports on the ATMega 328 are mapped to the Arduino IO pins.

    If you need more help please come back and others may be able to post a direct reference.

Reply

  • Bill,

         I can't locate the article I was thinking of to reply to your question.  However, what you need to do is Google is "Arduino port bit manipulation".  I am sure you will find numerous articles but what you are looking for is how to directly manipulate, read or set the port values.  Basically these use AVR code at a level the Arduino IDE shields you from.  These direct instructions are very fast and you can manipulate the whole port at once.  You also need to be mindful of how the actual ports on the ATMega 328 are mapped to the Arduino IO pins.

    If you need more help please come back and others may be able to post a direct reference.

Children