LMS 2012
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Device Connection Manager Driver

Manages the detection of adding and removing different devices to an input or an output port.
The device will change some connection levels on the port when added and that way give an event to start the evaluation of the device id.

The evaluation state machine is timer interrupt driven at a low frequency (less than 1KHz) so the used CPU power is held at lowest possible level.


Input Port

  • From the beginning all I/O is set as input - an open port is defined as:
    • Value at connection 1 is higher than IN1_NEAR_5V
    • Level at connection 2 is high
    • Level at connection 5 is high
    • Level at connection 6 is low
    • Value at connection 6 is lower than IN6_NEAR_GND


If anything changes to a steady value (for more than STEADY_TIME) it will start a state machine that will try to detect what happened.

When it is detected - a signal is sent to the Input Library Device Setup and the state will freeze in a state that only looks for an open port condition (for more than STEADY_TIME).

*/

#define   IN_CONNECT_STEADY_TIME        350   //  [mS]  time needed to be sure that the connection is steady
#define   IN_DISCONNECT_STEADY_TIME     100   //  [mS]  time needed to be sure that the disconnection is steady

#define   IN1_NEAR_5V                   4800  //  [mV]  higher values mean that connection 1 is floating
#define   IN1_NEAR_PIN2                 3100  //  [mV]  higher values mean that connection 1 is shorted to connection 2 (5000 * 18K / (18K + 10k))
#define   IN1_TOUCH_HIGH                950   //  [mV]  values in between these limits means that an old touch sensor is connected
#define   IN1_TOUCH_LOW                 850   //  [mV]
#define   IN1_NEAR_GND                  100   //  [mV]  lower  values mean that connection 1 is shorted to connection 3
#define   IN6_NEAR_GND                  150   //  [mV]  lower  values mean that connection 6 is floating

/*

INPUT
*********************************************************************************************************************************************************************************************************************

MICRO                             CIRCUIT                               CONNECTION        NEW UART DEVICE           NEW DUMB SENSOR                 OLD SENSOR                TACHO MOTOR           NEW DUMP ACTUATOR
----------------------            ----------------------------------    ----------        ---------------------     ------------------------        --------------------      ----------------      -----------------
Analogue I                        10K pull up to ADC_REF                    1             Short circuit to ground   ID resistor to ground           Analogue value            Motor +               Motor +

Digital I                         6K4 impedance to NEAR_PIN2 voltage        2             Open                      Open                            Short to ground           Motor -               Motor -

Ground                            Ground                                    3             Ground                    Ground                          Ground                    Ground                ?

Supply                            Supply                                    4             Supply                    Supply                          Supply                    Supply                ?

Digital I/O (float)               100K pull up to 3.3V                      5             RXD (float)               Short to ground                 ?                         Tacho A               ID resistor to 5

Analogue I + Digital I/O (float)  220K pull down to ground                  6             TXD (low)                 Analogue value                  ?                         Tacho B               ID resistor to 6

*********************************************************************************************************************************************************************************************************************



ID VALUE ON CONNECTION 1:

  ADC_REF         -----
  IN1_NEAR_5V     -----
                    |
                    |
                    |   TACHO MOTOR and NEW DUMB ACTUATOR
                    |
                    |
  IN1_NEAR_PIN2   -----
                    |
                    |
                    |
                    |
                    |
                    |
                    |
                    |   NEW SENSOR ID's
                    |
                    |
                    |
                    |
                    |
                    |
                    |   NEW UART SENSOR
  0.0V            -----



IMPLEMENTED DETECTION RULES (sequence matters):

I.      Connection 2 low
            1.  Connection 5 and 6 high                                   -> NXT IIC   DEVICE
            2.  Connection 5 low                                          -> NXT LIGHT SENSOR
            3.  Connection 1 lower than IN1_NEAR_GND                      -> NXT COLOR SENSOR
            4.  Connection 1 higher than IN1_NEAR_5V                      -> NXT TOUCH SENSOR
            5.  Connection 1 between IN1_TOUCH_HIGH and IN1_TOUCH_LOW     -> NXT TOUCH SENSOR
            6.  else                                                      -> NXT SOUND SENSOR


II.     Connection 1 loaded
            1.  Connection 1 higher than IN1_NEAR_PIN2                    -> ERROR
            2.  Connection 1 lower than IN1_NEAR_GND                      -> NEW UART DEVICE
            3.  else (value on connection 1 is ID)                        -> NEW DUMB DEVICE


III.    Connection 6 high                                                 -> NXT IIC TEMP SENSOR


IV.     Connection 5 low                                                  -> ERROR



NEW ID's:

The range from 0mV to just beneath the voltage on connection 2 is free to be used for the new sensor ID's - recommendations:

I.  Use a short circuit to ground to identify the UART device.
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Output Port

  • From the beginning motor driver is floating and all I/O is set as input - an open port is defined as:
    • Value at connection 5 is in between OUT5_BALANCE_LOW and OUT5_BALANCE_HIGH
    • Level at connection 5 is high
    • Level at connection 6 is high

If anything changes to a steady value (for more than STEADY_TIME) it will start a state machine that will try to detect what happened.

When it is detected - a signal is sent to the Input Library Device Setup and the state will freeze in a state that only looks for an open port condition (for more than STEADY_TIME).

*/

#define   OUT5_IIC_HIGH                 3700  //  [mV]  values in between these limits means that an old IIC sensor or color sensor is connected
#define   OUT5_IIC_LOW                  2800  //  [mV]

#define   OUT5_MINITACHO_HIGH1          2000  //  [mV]  values in between these limits means that a mini tacho motor is pulling high when pin5 is pulling low
#define   OUT5_MINITACHO_LOW1           1600  //  [mV]

#define   OUT5_BALANCE_HIGH             2600  //  [mV]  values in between these limits means that connection 5 is floating
#define   OUT5_BALANCE_LOW              2400  //  [mV]

#define   OUT5_LIGHT_HIGH                850  //  [mV]  values in between these limits means that an old light sensor is connected
#define   OUT5_LIGHT_LOW                 650  //  [mV]

#define   OUT5_MINITACHO_HIGH2           450  //  [mV]  values in between these limits means that a mini tacho motor is pulling low when pin5 floats
#define   OUT5_MINITACHO_LOW2            250  //  [mV]

#define   OUT5_NEAR_GND                  100  //  [mV]  lower  values mean that connection 5 is shorted to ground

/*


OUTPUT
*********************************************************************************************************************************************************************************************************************

MICRO                             CIRCUIT                               CONNECTION        NEW UART DEVICE           NEW DUMB SENSOR                 OLD SENSOR                TACHO MOTOR           NEW DUMP ACTUATOR
----------------------            -------------------------------       ----------        ---------------------     ------------------------        --------------------      ----------------      -----------------
Motor driver +                    Connected to motor driver                 1             ID resistor to ground     ID resistor to ground           Analogue value            Motor +               Motor +

Motor driver -                    100K pull up to ADC_REF                   2             Open                      Open                            Short to ground           Motor -               Motor -

Ground                            Ground                                    3             Ground                    Ground                          Ground                    Ground                ?

Supply                            Supply                                    4             Supply                    Supply                          Supply                    Supply                ?

Analogue I + Digital I/O          50K impedance to OUT5_BALANCE             5             RXD (float)               Short to ground                 ?                         Tacho A               ID resistor to 5

Digital I/O (low)                 100K pull up to connection 2              6             TXD (low)                 Analogue value                  ?                         Tacho B               ID resistor to 6

*********************************************************************************************************************************************************************************************************************



ID VALUE ON CONNECTION 5:

  Connection 6 floating                                                                                       Connection 6 low and value on connection 5 changed
  ---------------------------------------------------------------------------------------                     --------------------------------------------------

  ADC_REF           -------------------------------------------------------------------------------------------------
  NEAR_5V           -----                                           |
                      |                                             |
                      |                                             |
  3.3               - | - - - - - - - - - - - - - - - - - - - - - - | - - - - - - - - - - - - - - - - - - - - - - - -   2014 ADC reference voltage
                      |     LARGE TACHO MOTOR                       -
                      |     MINI TACHO MOTOR, NEW DUMB MOTOR        -     OLD TACHO MOTOR
                      |     NEW TACHO MOTOR                         -
  OUT5_IIC_HIGH     -----                                           |
                      |     OLD IIC SENSOR                          -
  OUT5_IIC_LOW      -----                                           |
                      |                                             |
  OUT5_BALANCE_HIGH -----                                           |
                      |     OPEN                                    -
  OUT5_BALANCE_LOW  -----                                           |
                      |                                             |                                           -----
                      |                                             |                                             |
                      |                                             |                                             |
                      |                                             |                                             |     NEW ACTUATOR ID's
                      |                                             |                                             |
                      |                                             |                                             |
                      |                                             |                                           -----
  OUT5_LIGHT_HIGH   -----                                           |
                      |     OLD LIGHT SENSOR                        -
  OUT5_LIGHT_LOW    -----                                           |
                      |     NEW TACHO MOTOR                         -
                      |     MINI TACHO MOTOR                        -
                      |     LARGE TACHO MOTOR                       -
  OUT5_NEAR_GND     -----                                         -----
                      |     NEW DUMB SENSOR
  0.0V              -------------------------------------------------------------------------------------------------

When something is connected: the value on connection 5 is stored as Value5Float. Connection 6 is driven low and the value on connection 5 is then stored as Value5Low.
Connection 6 is set floating again.
The two stored values is used to determine the type of the attached device.


IMPLEMENTED DETECTION RULES (sequence matters):

I.      Value5Float is equal to Value5Low
            1.  Value5Float is between OUT5_BALANCE_LOW and OUT5_BALANCE_HIGH and Connection 6 is low   -> ERROR        (NXT TOUCH SENSOR, NXT SOUND SENSOR, NEW UART SENSOR)
            2.  Value5Float is lower than OUT5_NEAR_GND                                                 -> ERROR        (NEW DUMP SENSOR)
            3.  Value5Float is between OUT5_LIGHT_LOW and OUT5_LIGHT_HIGH                               -> ERROR        (OLD IIC SENSOR)
            4.  Value5Float is between OUT5_IIC_LOW and OUT5_IIC_HIGH                                   -> ERROR        (OLD TEMP SENSOR)
            5.  Value5Float is lower than OUT5_BALANCE_LOW
                    Value5Float is higher than OUT5_MINITACHO_HIGH2                                     -> NEW TACHO
                    Value5Float is higher than OUT5_MINITACHO_LOW2                                      -> MINI TACHO   (NEW MINI TACHO MOTOR)
                    else                                                                                -> TACHO MOTOR
            6.  Set connection 5 low and measure new Value5Low
            7.  VALUE5Low is lower than OUT5_MINITACHO_LOW1                                             -> NEW TACHO    (NEW MINI TACHO MOTOR)
                    VALUE5Low is lower than OUT5_MINITACHO_HIGH1                                        -> MINI TACHO   (NEW MINI TACHO MOTOR)
                    else                                                                                -> TACHO MOTOR

II.     Value5Float is NOT equal to Value5Low
            1.  Value5Low is between OUT5_NEAR_GND and OUT5_BALANCE_LOW                                 -> NEW DUMP ACTUATOR  (ID is Value5Low)
            2.  else                                                                                    -> ERROR



NEW ID's:

The range from 800mV to OUT5_BALANCE_LOW is free to be used for the new sensor ID's - recommendations:

I.    Use a short circuit between connection 5 and connection 6 to identify the cheapest device

II.   Remember to reserve one id for the smart actuator (maybe the highest resistance = 500K)

III.  Remember that the ID resistor must get connection 5 out of balance

IV.   Remember the voltage on pin 1 when connected to an input port
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