1 Reply Latest reply on Apr 13, 2011 11:31 AM by graa

    Multiple slave I2C

    user_4896474

      Hallo,

         

      I have a doubt about handling a communication with a couple of I2C slaves. If I usually perform:

         

      a write on the first slave, a read from the first slave, a write to the second slave, a read from the second slave

         

      If one of that functions takes too much time I simply skip on the next task simply clearing the read/write status.

         

      The question is: "I have to send a stop the the slave before dropping the task I was executing with him"?

        • 1. Re: Multiple slave I2C
          graa

          Clearing the Read or Write status will not work if the Slave did not respond. Once you initiate an read or write on the I2C bus, if there is an error on the bus like the slave not ready, you will have to stop and start the I2C hardware.

             

           

             

          You can avoid this restarting operation by checking if the slave is ready by using the I2C low level API fSendStart and initiate the read or write only if the slave is active.  Check out the below forum post where a similar issue is discussed.

             

           

             

          http://www.cypress.com/?app=forum&id=1573&rID=50008

             

           

             

          Best Regards,

             

          Ganesh

             

          The PSoC Hacker