REM 16MT Sensor Demo

The purpose of this app is showing the use of the REM 16MT Sensor Module with Position Feedback Module. For that, it implements a simple app that reads the output of a REM 16MT sensor and shows over XScope the read velocity and position. It also displays the status of the sensor for debugging.

The data displayed over XScope is:
  • Position: the single turn position filtered
  • Position Raw: the single turn position raw
  • Count: the absolute multiturn position
  • Velocity: the velocity
  • Timestamp: the timestamp difference between two reads in microseconds
  • Status: the sensor status
  • checksum error: the number of read retry caused by checksum error

With this app you can also send direct commands to the REM 16MT sensor (reset, change filter setting, etc...) and control the motor.

The commands are:
  • a: start auto detection of commutation offset
  • d [number]: change sensor polarity (direction), 0 is Clockwise and 1 is Counter Clockwise
  • f [number]: change filter setting. 0 is disabled. 2 to 9 to enable (9 is the strongest)
  • o [number]: set singleturn offset
  • p [number]: set absolute multiturn position
  • m [number]: set multiturn value (the number of turn)
  • s [number]: set singleturn position
  • q [number]: set torque
  • r: reset the sensor
  • t [number]: start a calibration with [number] points
  • c [number]: set a calibration point
  • v: save sensor configuration to flash
  • z: reset position to zero
  • l [number]: set velocity compute period
  • [number]: print the position and the time to get it
  • Min. Nr. of cores: 2
  • Min. Nr. of tiles: 1

Quick How-to

  1. Assemble your SOMANET device.
  2. Wire up your device. Check how at your specific hardware documentation. Connect your sensor, power supply cable, and XTAG. Power up!
  3. Set up your XMOS development tools.
  4. Download and import in your workspace the SOMANET Motor Control Library and its dependencies.
  5. Open the main.xc within the app. Include the board-support file according to your device. Also set the appropriate target in your Makefile.

Important

Make sure the SOMANET Motor Control Library supports your SOMANET device. For that, check the Hardware compatibility section of the library.

  1. Again in your main.xc, set the configuration for the Position feedback Service and you sensor.

    on tile[IF2_TILE]:
    /* Position feedback service */
    {
        PositionFeedbackConfig position_feedback_config;
        position_feedback_config.sensor_type = REM_16MT_SENSOR;
        position_feedback_config.resolution  = REM_16MT_SENSOR_RESOLUTION;
        position_feedback_config.polarity    = NORMAL_POLARITY;
        position_feedback_config.velocity_compute_period = REM_16MT_SENSOR_VELOCITY_COMPUTE_PERIOD;
        position_feedback_config.pole_pairs  = POLE_PAIRS;
        position_feedback_config.tile_usec   = IF2_TILE_USEC;
        position_feedback_config.max_ticks   = SENSOR_MAX_TICKS;
        position_feedback_config.offset      = 0;
        position_feedback_config.sensor_function = SENSOR_FUNCTION_COMMUTATION_AND_MOTION_CONTROL;
    
        position_feedback_config.rem_16mt_config.filter = REM_16MT_FILTER;
    
        position_feedback_service(null, null, null, spi_ports, gpio_port_0, gpio_port_1, gpio_port_2, gpio_port_3,
                position_feedback_config, i_shared_memory[0], i_position_feedback,
                null, null, null);
    }
    
  2. Run the application enabling XScope.

See also

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