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Hello , I am Aditya S and in my application I use MPR121 interfaced with PIC via i2c . The MPR121 is further interfaced with touchboard to take touch input and give led output .I have observed that the touch board hangs in the middle ( led states remain s

Question asked by ADITYA SURIPEDDI on May 22, 2015
Latest reply on May 27, 2015 by Jose Alberto Reyes Morales

Hello ,

 

 

I am Aditya S and in my application I use MPR121 interfaced with PIC via i2c . The MPR121 is further interfaced with touchboard to take touch input and give led output .I have observed that the touch board hangs in the middle ( led states remain same and touch is non responsive ) and when watch dog timer reset occurs in the PIC the leds driven by MPR121 on touch board are NOT turning off . I would like to know if the MPR121 might have hanged .

 

Rough schematic :-

   

      ..............................                ................................                      ...................................

    |                              | <.... 1 >   |                               |   <...3>         |                                  |

        touch plate                                  mpr121                                             PIC

    |                              |  <.....2>   |                               |   <...4>         |                                  |

     ..............................                .................................                       ....................................

 

    

1. Touch input from touch plate to mpr121

2. GPIO leds on touch plate to indicate on / off

3. I2C lines b/w PIC and mpr121

4. Used to raise hardware interrupt upon touch on PIC by mpr121

 

 

 

Regards ,

Aditya S

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