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Cannot read valid data from MMA9555L

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miladsh52@gmail.com

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Hi everyone,

I'm working with MMA9555L module through an i2c interface, but I'm having a problem with pedometer function in MMA9555L. For a sanity check, I read back the version information which is ok and gets back the desired data but when I want to read the data from pedometer application, the slave returns 0x9C instead of 0x80 which shows the error "the command interpreter does not recognize a command code". How can I fix this error? Here is my code:

Code C - [expand]
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void main()
 
{
   void pedometerConfigRegs();           //sets the configuration registers of the pedometer application
                                                        //send these bytes to the part: 0x15, 0x20, 0x00, 0x11, 0x00, 0x00, 0x00, 0x00,                                                                   0x00, 0x00, 0xE0, 0x00, 0xB6, 0x44, 0x04, 0x83, 0x05, 0x82, 0x00, 0x00, 0x00
   void pedometerReadValue();            //reads back from the slave
                                                        //send these bytes to the part: 0x15, 0x30, 0x00, 0x0C
   while(1)
   {
      read_i2c(16);
   }
}


Any help is highly appreciated.

Regards,

Milad.
 

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