Modbus - Silent Stepper Bricklet 2.0¶

Basic Functions¶

BrickletSilentStepperV2.set_max_velocity¶

Function ID:	1
Request:	velocity – Type: uint16, Unit: 1 1/s, Range: [0 to 216 - 1]
Response:	no response

Sets the maximum velocity of the stepper motor. This function does not start the motor, it merely sets the maximum velocity the stepper motor is accelerated to. To get the motor running use either set_target_position, set_steps, drive_forward or drive_backward.

BrickletSilentStepperV2.get_max_velocity¶

Function ID:	2
Request:	empty payload
Response:	velocity – Type: uint16, Unit: 1 1/s, Range: [0 to 216 - 1]

Returns the velocity as set by set_max_velocity.

BrickletSilentStepperV2.get_current_velocity¶

Function ID:	3
Request:	empty payload
Response:	velocity – Type: uint16, Unit: 1 1/s, Range: [0 to 216 - 1]

Returns the current velocity of the stepper motor.

BrickletSilentStepperV2.set_speed_ramping¶

Function ID:	4
Request:	acceleration – Type: uint16, Unit: 1 1/s², Range: [0 to 216 - 1], Default: 1000 deacceleration – Type: uint16, Unit: 1 1/s², Range: [0 to 216 - 1], Default: 1000
Response:	no response

Sets the acceleration and deacceleration of the stepper motor. An acceleration of 1000 means, that every second the velocity is increased by 1000 steps/s.

For example: If the current velocity is 0 and you want to accelerate to a velocity of 8000 steps/s in 10 seconds, you should set an acceleration of 800 steps/s².

An acceleration/deacceleration of 0 means instantaneous acceleration/deacceleration (not recommended)

BrickletSilentStepperV2.get_speed_ramping¶

Function ID:	5
Request:	empty payload
Response:	acceleration – Type: uint16, Unit: 1 1/s², Range: [0 to 216 - 1], Default: 1000 deacceleration – Type: uint16, Unit: 1 1/s², Range: [0 to 216 - 1], Default: 1000

Returns the acceleration and deacceleration as set by set_speed_ramping.

BrickletSilentStepperV2.full_brake¶

Function ID:	6
Request:	empty payload
Response:	no response

Executes an active full brake.

Warning

This function is for emergency purposes, where an immediate brake is necessary. Depending on the current velocity and the strength of the motor, a full brake can be quite violent.

Call stop if you just want to stop the motor.

BrickletSilentStepperV2.set_steps¶

Function ID:	11
Request:	steps – Type: int32, Range: [-231 to 231 - 1]
Response:	no response

Sets the number of steps the stepper motor should run. Positive values will drive the motor forward and negative values backward. The velocity, acceleration and deacceleration as set by set_max_velocity and set_speed_ramping will be used.

BrickletSilentStepperV2.get_steps¶

Function ID:	12
Request:	empty payload
Response:	steps – Type: int32, Range: [-231 to 231 - 1]

Returns the last steps as set by set_steps.

BrickletSilentStepperV2.get_remaining_steps¶

Function ID:	13
Request:	empty payload
Response:	steps – Type: int32, Range: [-231 to 231 - 1]

Returns the remaining steps of the last call of set_steps. For example, if set_steps is called with 2000 and get_remaining_steps is called after the motor has run for 500 steps, it will return 1500.

BrickletSilentStepperV2.drive_forward¶

Function ID:	16
Request:	empty payload
Response:	no response

Drives the stepper motor forward until drive_backward or stop is called. The velocity, acceleration and deacceleration as set by set_max_velocity and set_speed_ramping will be used.

BrickletSilentStepperV2.drive_backward¶

Function ID:	17
Request:	empty payload
Response:	no response

Drives the stepper motor backward until drive_forward or stop is triggered. The velocity, acceleration and deacceleration as set by set_max_velocity and set_speed_ramping will be used.

BrickletSilentStepperV2.stop¶

Function ID:	18
Request:	empty payload
Response:	no response

Stops the stepper motor with the deacceleration as set by set_speed_ramping.

BrickletSilentStepperV2.set_motor_current¶

Function ID:	22
Request:	current – Type: uint16, Unit: 1 mA, Range: [360 to 1640], Default: 800
Response:	no response

Sets the current with which the motor will be driven.

Warning

Do not set this value above the specifications of your stepper motor. Otherwise it may damage your motor.

BrickletSilentStepperV2.get_motor_current¶

Function ID:	23
Request:	empty payload
Response:	current – Type: uint16, Unit: 1 mA, Range: [360 to 1640], Default: 800

Returns the current as set by set_motor_current.

BrickletSilentStepperV2.set_enabled¶

Function ID:	24
Request:	enabled – Type: bool, Default: false
Response:	no response

Enables/Disables the driver chip. The driver parameters can be configured (maximum velocity, acceleration, etc) before it is enabled.

Warning

Disabling the driver chip while the motor is still turning can damage the driver chip. The motor should be stopped calling stop function before disabling the motor power. The stop function will not wait until the motor is actually stopped. You have to explicitly wait for the appropriate time after calling the stop function before calling the set_enabled with false function.

BrickletSilentStepperV2.get_enabled¶

Function ID:	25
Request:	empty payload
Response:	enabled – Type: bool, Default: false

Returns true if the stepper driver is enabled, false otherwise.

BrickletSilentStepperV2.set_basic_configuration¶

Function ID:	26
Request:	standstill_current – Type: uint16, Unit: 1 mA, Range: [0 to 216 - 1], Default: 200 motor_run_current – Type: uint16, Unit: 1 mA, Range: [0 to 216 - 1], Default: 800 standstill_delay_time – Type: uint16, Unit: 1 ms, Range: [0 to 307], Default: 0 power_down_time – Type: uint16, Unit: 1 ms, Range: [0 to 5222], Default: 1000 stealth_threshold – Type: uint16, Unit: 1 1/s, Range: [0 to 216 - 1], Default: 500 coolstep_threshold – Type: uint16, Unit: 1 1/s, Range: [0 to 216 - 1], Default: 500 classic_threshold – Type: uint16, Unit: 1 1/s, Range: [0 to 216 - 1], Default: 1000 high_velocity_chopper_mode – Type: bool, Default: false
Response:	no response

Sets the basic configuration parameters for the different modes (Stealth, Coolstep, Classic).

• Standstill Current: This value can be used to lower the current during stand still. This might be reasonable to reduce the heating of the motor and the Bricklet 2.0. When the motor is in standstill the configured motor phase current will be driven until the configured Power Down Time is elapsed. After that the phase current will be reduced to the standstill current. The elapsed time for this reduction can be configured with the Standstill Delay Time. The maximum allowed value is the configured maximum motor current (see set_motor_current).
• Motor Run Current: The value sets the motor current when the motor is running. Use a value of at least one half of the global maximum motor current for a good microstep performance. The maximum allowed value is the current motor current. The API maps the entered value to 1/32 ... 32/32 of the maximum motor current. This value should be used to change the motor current during motor movement, whereas the global maximum motor current should not be changed while the motor is moving (see set_motor_current).
• Standstill Delay Time: Controls the duration for motor power down after a motion as soon as standstill is detected and the Power Down Time is expired. A high Standstill Delay Time results in a smooth transition that avoids motor jerk during power down.
• Power Down Time: Sets the delay time after a stand still.
• Stealth Threshold: Sets the upper threshold for Stealth mode. If the velocity of the motor goes above this value, Stealth mode is turned off. Otherwise it is turned on. In Stealth mode the torque declines with high speed.
• Coolstep Threshold: Sets the lower threshold for Coolstep mode. The Coolstep Threshold needs to be above the Stealth Threshold.
• Classic Threshold: Sets the lower threshold for classic mode. In classic mode the stepper becomes more noisy, but the torque is maximized.
• High Velocity Chopper Mode: If High Velocity Chopper Mode is enabled, the stepper control is optimized to run the stepper motors at high velocities.

If you want to use all three thresholds make sure that Stealth Threshold < Coolstep Threshold < Classic Threshold.

BrickletSilentStepperV2.get_basic_configuration¶

Function ID:	27
Request:	empty payload
Response:	standstill_current – Type: uint16, Unit: 1 mA, Range: [0 to 216 - 1], Default: 200 motor_run_current – Type: uint16, Unit: 1 mA, Range: [0 to 216 - 1], Default: 800 standstill_delay_time – Type: uint16, Unit: 1 ms, Range: [0 to 307], Default: 0 power_down_time – Type: uint16, Unit: 1 ms, Range: [0 to 5222], Default: 1000 stealth_threshold – Type: uint16, Unit: 1 1/s, Range: [0 to 216 - 1], Default: 500 coolstep_threshold – Type: uint16, Unit: 1 1/s, Range: [0 to 216 - 1], Default: 500 classic_threshold – Type: uint16, Unit: 1 1/s, Range: [0 to 216 - 1], Default: 1000 high_velocity_chopper_mode – Type: bool, Default: false

Returns the configuration as set by set_basic_configuration.

BrickletSilentStepperV2.set_gpio_configuration¶

Function ID:	48
Request:	channel – Type: uint8, Range: [0 to 1] debounce – Type: uint16, Unit: 1 ms, Range: [0 to 216 - 1], Default: 200 stop_deceleration – Type: uint16, Unit: 1 1/s², Range: [0 to 216 - 1], Default: 216 - 1
Response:	no response

Sets the GPIO configuration for the given channel. You can configure a debounce and the deceleration that is used if the action is configured as normal stop. See set_gpio_action.

BrickletSilentStepperV2.get_gpio_configuration¶

Function ID:	49
Request:	channel – Type: uint8, Range: [0 to 1]
Response:	debounce – Type: uint16, Unit: 1 ms, Range: [0 to 216 - 1], Default: 200 stop_deceleration – Type: uint16, Unit: 1 1/s², Range: [0 to 216 - 1], Default: 216 - 1

Returns the GPIO configuration for a channel as set by set_gpio_configuration.

BrickletSilentStepperV2.set_gpio_action¶

Function ID:	50
Request:	channel – Type: uint8, Range: [0 to 1] action – Type: uint32, Range: See meanings, Default: 0
Response:	no response

Sets the GPIO action for the given channel.

The action can be a normal stop, a full brake or a callback. Each for a rising edge or falling edge. The actions are a bitmask they can be used at the same time. You can for example trigger a full brake and a callback at the same time or for rising and falling edge.

The deceleration speed for the normal stop can be configured with set_gpio_configuration.

The following meanings are defined for the elements of this function:

For action:

• 0 = None
• 1 = Normal Stop Rising Edge
• 2 = Normal Stop Falling Edge
• 4 = Full Brake Rising Edge
• 8 = Full Brake Falling Edge
• 16 = Callback Rising Edge
• 32 = Callback Falling Edge

BrickletSilentStepperV2.get_gpio_action¶

Function ID:	51
Request:	channel – Type: uint8, Range: [0 to 1]
Response:	action – Type: uint32, Range: See meanings, Default: 0

Returns the GPIO action for a channel as set by set_gpio_action.

The following meanings are defined for the elements of this function:

For action:

• 0 = None
• 1 = Normal Stop Rising Edge
• 2 = Normal Stop Falling Edge
• 4 = Full Brake Rising Edge
• 8 = Full Brake Falling Edge
• 16 = Callback Rising Edge
• 32 = Callback Falling Edge

BrickletSilentStepperV2.get_gpio_state¶

Function ID:	52
Request:	empty payload
Response:	gpio_state – Type: bool[2]

Returns the GPIO state for both channels. True if the state is high and false if the state is low.

Advanced Functions¶

BrickletSilentStepperV2.set_current_position¶

Function ID:	7
Request:	position – Type: int32, Range: [-231 to 231 - 1]
Response:	no response

Sets the current steps of the internal step counter. This can be used to set the current position to 0 when some kind of starting position is reached (e.g. when a CNC machine reaches a corner).

BrickletSilentStepperV2.get_current_position¶

Function ID:	8
Request:	empty payload
Response:	position – Type: int32, Range: [-231 to 231 - 1]

Returns the current position of the stepper motor in steps. On startup the position is 0. The steps are counted with all possible driving functions (set_target_position, set_steps, drive_forward or drive_backward). It also is possible to reset the steps to 0 or set them to any other desired value with set_current_position.

BrickletSilentStepperV2.set_target_position¶

Function ID:	9
Request:	position – Type: int32, Range: [-231 to 231 - 1]
Response:	no response

Sets the target position of the stepper motor in steps. For example, if the current position of the motor is 500 and set_target_position is called with 1000, the stepper motor will drive 500 steps forward. It will use the velocity, acceleration and deacceleration as set by set_max_velocity and set_speed_ramping.

A call of set_target_position with the parameter x is equivalent to a call of set_steps with the parameter (x - get_current_position).

BrickletSilentStepperV2.get_target_position¶

Function ID:	10
Request:	empty payload
Response:	position – Type: int32, Range: [-231 to 231 - 1]

Returns the last target position as set by set_target_position.

BrickletSilentStepperV2.set_step_configuration¶

Function ID:	14
Request:	step_resolution – Type: uint8, Range: See meanings, Default: 0 interpolation – Type: bool, Default: true
Response:	no response

Sets the step resolution from full-step up to 1/256-step.

If interpolation is turned on, the Silent Stepper Bricklet 2.0 will always interpolate your step inputs as 1/256-step. If you use full-step mode with interpolation, each step will generate 256 1/256 steps.

For maximum torque use full-step without interpolation. For maximum resolution use 1/256-step. Turn interpolation on to make the Stepper driving less noisy.

If you often change the speed with high acceleration you should turn the interpolation off.

The following meanings are defined for the elements of this function:

For step_resolution:

• 8 = 1
• 7 = 2
• 6 = 4
• 5 = 8
• 4 = 16
• 3 = 32
• 2 = 64
• 1 = 128
• 0 = 256

BrickletSilentStepperV2.get_step_configuration¶

Function ID:	15
Request:	empty payload
Response:	step_resolution – Type: uint8, Range: See meanings interpolation – Type: bool, Default: true

Returns the step mode as set by set_step_configuration.

The following meanings are defined for the elements of this function:

For step_resolution:

• 8 = 1
• 7 = 2
• 6 = 4
• 5 = 8
• 4 = 16
• 3 = 32
• 2 = 64
• 1 = 128
• 0 = 256

BrickletSilentStepperV2.get_input_voltage¶

Function ID:	19
Request:	empty payload
Response:	voltage – Type: uint16, Unit: 1 mV, Range: [0 to 216 - 1]

Returns the external input voltage. The external input voltage is given via the black power input connector on the Silent Stepper Bricklet 2.0.

If there is an external input voltage and a stack input voltage, the motor will be driven by the external input voltage. If there is only a stack voltage present, the motor will be driven by this voltage.

Warning

This means, if you have a high stack voltage and a low external voltage, the motor will be driven with the low external voltage. If you then remove the external connection, it will immediately be driven by the high stack voltage

BrickletSilentStepperV2.set_spreadcycle_configuration¶

Function ID:	28
Request:	slow_decay_duration – Type: uint8, Range: [0 to 15], Default: 4 enable_random_slow_decay – Type: bool, Default: false fast_decay_duration – Type: uint8, Range: [0 to 15], Default: 0 hysteresis_start_value – Type: uint8, Range: [0 to 7], Default: 0 hysteresis_end_value – Type: int8, Range: [-3 to 12], Default: 0 sine_wave_offset – Type: int8, Range: [-3 to 12], Default: 0 chopper_mode – Type: uint8, Range: See meanings, Default: 0 comparator_blank_time – Type: uint8, Range: [0 to 3], Default: 1 fast_decay_without_comparator – Type: bool, Default: false
Response:	no response

Note: If you don't know what any of this means you can very likely keep all of the values as default!

Sets the Spreadcycle configuration parameters. Spreadcycle is a chopper algorithm which actively controls the motor current flow. More information can be found in the TMC2130 datasheet on page 47 (7 spreadCycle and Classic Chopper).

• Slow Decay Duration: Controls duration of off time setting of slow decay phase. 0 = driver disabled, all bridges off. Use 1 only with Comparator Blank time >= 2.

• Enable Random Slow Decay: Set to false to fix chopper off time as set by Slow Decay Duration. If you set it to true, Decay Duration is randomly modulated.

• Fast Decay Duration: Sets the fast decay duration. This parameters is only used if the Chopper Mode is set to Fast Decay.

• Hysteresis Start Value: Sets the hysteresis start value. This parameter is only used if the Chopper Mode is set to Spread Cycle.

• Hysteresis End Value: Sets the hysteresis end value. This parameter is only used if the Chopper Mode is set to Spread Cycle.

• Sine Wave Offset: Sets the sine wave offset. This parameters is only used if the Chopper Mode is set to Fast Decay. 1/512 of the value becomes added to the absolute value of the sine wave.

• Chopper Mode: 0 = Spread Cycle, 1 = Fast Decay.

• Comparator Blank Time: Sets the blank time of the comparator. Available values are

  • 0 = 16 clocks,
  • 1 = 24 clocks,
  • 2 = 36 clocks and
  • 3 = 54 clocks.

  A value of 1 or 2 is recommended for most applications.

• Fast Decay Without Comparator: If set to true the current comparator usage for termination of the fast decay cycle is disabled.

The following meanings are defined for the elements of this function:

For chopper_mode:

• 0 = Spread Cycle
• 1 = Fast Decay

BrickletSilentStepperV2.get_spreadcycle_configuration¶

Function ID:	29
Request:	empty payload
Response:	slow_decay_duration – Type: uint8, Range: [0 to 15], Default: 4 enable_random_slow_decay – Type: bool, Default: false fast_decay_duration – Type: uint8, Range: [0 to 15], Default: 0 hysteresis_start_value – Type: uint8, Range: [0 to 7], Default: 0 hysteresis_end_value – Type: int8, Range: [-3 to 12], Default: 0 sine_wave_offset – Type: int8, Range: [-3 to 12], Default: 0 chopper_mode – Type: uint8, Range: See meanings, Default: 0 comparator_blank_time – Type: uint8, Range: [0 to 3], Default: 1 fast_decay_without_comparator – Type: bool, Default: false

Returns the configuration as set by set_basic_configuration.

The following meanings are defined for the elements of this function:

For chopper_mode:

• 0 = Spread Cycle
• 1 = Fast Decay

BrickletSilentStepperV2.set_stealth_configuration¶

Function ID:	30
Request:	enable_stealth – Type: bool, Default: true amplitude – Type: uint8, Range: [0 to 255], Default: 128 gradient – Type: uint8, Range: [0 to 255], Default: 4 enable_autoscale – Type: bool, Default: true force_symmetric – Type: bool, Default: false freewheel_mode – Type: uint8, Range: See meanings, Default: 0
Response:	no response

Note: If you don't know what any of this means you can very likely keep all of the values as default!

Sets the configuration relevant for Stealth mode.

• Enable Stealth: If set to true the stealth mode is enabled, if set to false the stealth mode is disabled, even if the speed is below the threshold set in set_basic_configuration.
• Amplitude: If autoscale is disabled, the PWM amplitude is scaled by this value. If autoscale is enabled, this value defines the maximum PWM amplitude change per half wave.
• Gradient: If autoscale is disabled, the PWM gradient is scaled by this value. If autoscale is enabled, this value defines the maximum PWM gradient. With autoscale a value above 64 is recommended, otherwise the regulation might not be able to measure the current.
• Enable Autoscale: If set to true, automatic current control is used. Otherwise the user defined amplitude and gradient are used.
• Force Symmetric: If true, A symmetric PWM cycle is enforced. Otherwise the PWM value may change within each PWM cycle.
• Freewheel Mode: The freewheel mode defines the behavior in stand still if the Standstill Current (see set_basic_configuration) is set to 0.

The following meanings are defined for the elements of this function:

For freewheel_mode:

• 0 = Normal
• 1 = Freewheeling
• 2 = Coil Short LS
• 3 = Coil Short HS

BrickletSilentStepperV2.get_stealth_configuration¶

Function ID:	31
Request:	empty payload
Response:	enable_stealth – Type: bool, Default: true amplitude – Type: uint8, Range: [0 to 255], Default: 128 gradient – Type: uint8, Range: [0 to 255], Default: 4 enable_autoscale – Type: bool, Default: true force_symmetric – Type: bool, Default: false freewheel_mode – Type: uint8, Range: See meanings, Default: 0

Returns the configuration as set by set_stealth_configuration.

The following meanings are defined for the elements of this function:

For freewheel_mode:

• 0 = Normal
• 1 = Freewheeling
• 2 = Coil Short LS
• 3 = Coil Short HS

BrickletSilentStepperV2.set_coolstep_configuration¶

Function ID:	32
Request:	minimum_stallguard_value – Type: uint8, Range: [0 to 15], Default: 2 maximum_stallguard_value – Type: uint8, Range: [0 to 15], Default: 10 current_up_step_width – Type: uint8, Range: See meanings, Default: 0 current_down_step_width – Type: uint8, Range: See meanings, Default: 0 minimum_current – Type: uint8, Range: See meanings, Default: 0 stallguard_threshold_value – Type: int8, Range: [-64 to 63], Default: 0 stallguard_mode – Type: uint8, Range: See meanings, Default: 0
Response:	no response

Note: If you don't know what any of this means you can very likely keep all of the values as default!

Sets the configuration relevant for Coolstep.

• Minimum Stallguard Value: If the Stallguard result falls below this value*32, the motor current is increased to reduce motor load angle. A value of 0 turns Coolstep off.
• Maximum Stallguard Value: If the Stallguard result goes above (Min Stallguard Value + Max Stallguard Value + 1) * 32, the motor current is decreased to save energy.
• Current Up Step Width: Sets the up step increment per Stallguard value. The value range is 0-3, corresponding to the increments 1, 2, 4 and 8.
• Current Down Step Width: Sets the down step decrement per Stallguard value. The value range is 0-3, corresponding to the decrements 1, 2, 8 and 16.
• Minimum Current: Sets the minimum current for Coolstep current control. You can choose between half and quarter of the run current.
• Stallguard Threshold Value: Sets the level for stall output (see get_driver_status). A lower value gives a higher sensitivity. You have to find a suitable value for your motor by trial and error, 0 works for most motors.
• Stallguard Mode: Set to 0 for standard resolution or 1 for filtered mode. In filtered mode the Stallguard signal will be updated every four full-steps.

The following meanings are defined for the elements of this function:

For current_up_step_width:

• 0 = 1
• 1 = 2
• 2 = 4
• 3 = 8

For current_down_step_width:

• 0 = 1
• 1 = 2
• 2 = 8
• 3 = 32

For minimum_current:

• 0 = Half
• 1 = Quarter

For stallguard_mode:

• 0 = Standard
• 1 = Filtered

BrickletSilentStepperV2.get_coolstep_configuration¶

Function ID:	33
Request:	empty payload
Response:	minimum_stallguard_value – Type: uint8, Range: [0 to 15], Default: 2 maximum_stallguard_value – Type: uint8, Range: [0 to 15], Default: 10 current_up_step_width – Type: uint8, Range: See meanings, Default: 0 current_down_step_width – Type: uint8, Range: See meanings, Default: 0 minimum_current – Type: uint8, Range: See meanings, Default: 0 stallguard_threshold_value – Type: int8, Range: [-64 to 63], Default: 0 stallguard_mode – Type: uint8, Range: See meanings, Default: 0

Returns the configuration as set by set_coolstep_configuration.

The following meanings are defined for the elements of this function:

For current_up_step_width:

• 0 = 1
• 1 = 2
• 2 = 4
• 3 = 8

For current_down_step_width:

• 0 = 1
• 1 = 2
• 2 = 8
• 3 = 32

For minimum_current:

• 0 = Half
• 1 = Quarter

For stallguard_mode:

• 0 = Standard
• 1 = Filtered

BrickletSilentStepperV2.set_misc_configuration¶

Function ID:	34
Request:	disable_short_to_ground_protection – Type: bool, Default: false synchronize_phase_frequency – Type: uint8, Range: [0 to 15], Default: 0
Response:	no response

Note: If you don't know what any of this means you can very likely keep all of the values as default!

Sets miscellaneous configuration parameters.

• Disable Short To Ground Protection: Set to false to enable short to ground protection, otherwise it is disabled.
• Synchronize Phase Frequency: With this parameter you can synchronize the chopper for both phases of a two phase motor to avoid the occurrence of a beat. The value range is 0-15. If set to 0, the synchronization is turned off. Otherwise the synchronization is done through the formula f_sync = f_clk/(value*64). In Classic Mode the synchronization is automatically switched off. f_clk is 12.8MHz.

BrickletSilentStepperV2.get_misc_configuration¶

Function ID:	35
Request:	empty payload
Response:	disable_short_to_ground_protection – Type: bool, Default: false synchronize_phase_frequency – Type: uint8, Range: [0 to 15], Default: 0

Returns the configuration as set by set_misc_configuration.

BrickletSilentStepperV2.set_error_led_config¶

Function ID:	36
Request:	config – Type: uint8, Range: See meanings, Default: 3
Response:	no response

Configures the error LED to be either turned off, turned on, blink in heartbeat mode or show an error.

If the LED is configured to show errors it has three different states:

• Off: No error present.
• 250ms interval blink: Overtemperature warning.
• 1s interval blink: Input voltage too small.
• full red: motor disabled because of short to ground in phase a or b or because of overtemperature.

The following meanings are defined for the elements of this function:

For config:

• 0 = Off
• 1 = On
• 2 = Show Heartbeat
• 3 = Show Error

BrickletSilentStepperV2.get_error_led_config¶

Function ID:	37
Request:	empty payload
Response:	config – Type: uint8, Range: See meanings, Default: 3

Returns the LED configuration as set by set_error_led_config

The following meanings are defined for the elements of this function:

For config:

• 0 = Off
• 1 = On
• 2 = Show Heartbeat
• 3 = Show Error

BrickletSilentStepperV2.get_driver_status¶

Function ID:	38
Request:	empty payload
Response:	open_load – Type: uint8, Range: See meanings short_to_ground – Type: uint8, Range: See meanings over_temperature – Type: uint8, Range: See meanings motor_stalled – Type: bool actual_motor_current – Type: uint8, Range: [0 to 31] full_step_active – Type: bool stallguard_result – Type: uint8, Range: [0 to 255] stealth_voltage_amplitude – Type: uint8, Range: [0 to 255]

Returns the current driver status.

• Open Load: Indicates if an open load is present on phase A, B or both. This could mean that there is a problem with the wiring of the motor. False detection can occur in fast motion as well as during stand still.
• Short To Ground: Indicates if a short to ground is present on phase A, B or both. If this is detected the driver automatically becomes disabled and stays disabled until it is enabled again manually.
• Over Temperature: The over temperature indicator switches to "Warning" if the driver IC warms up. The warning flag is expected during long duration stepper uses. If the temperature limit is reached the indicator switches to "Limit". In this case the driver becomes disabled until it cools down again.
• Motor Stalled: Is true if a motor stall was detected.
• Actual Motor Current: Indicates the actual current control scaling as used in Coolstep mode. It represents a multiplier of 1/32 to 32/32 of the Motor Run Current as set by set_basic_configuration. Example: If a Motor Run Current of 1000mA was set and the returned value is 15, the Actual Motor Current is 16/32*1000mA = 500mA.
• Stallguard Result: Indicates the load of the motor. A lower value signals a higher load. Per trial and error you can find out which value corresponds to a suitable torque for the velocity used in your application. After that you can use this threshold value to find out if a motor stall becomes probable and react on it (e.g. decrease velocity). During stand still this value can not be used for stall detection, it shows the chopper on-time for motor coil A.
• Stealth Voltage Amplitude: Shows the actual PWM scaling. In Stealth mode it can be used to detect motor load and stall if autoscale is enabled (see set_stealth_configuration).

The following meanings are defined for the elements of this function:

For open_load:

• 0 = None
• 1 = Phase A
• 2 = Phase B
• 3 = Phase AB

For short_to_ground:

• 0 = None
• 1 = Phase A
• 2 = Phase B
• 3 = Phase AB

For over_temperature:

• 0 = None
• 1 = Warning
• 2 = Limit

BrickletSilentStepperV2.set_time_base¶

Function ID:	43
Request:	time_base – Type: uint32, Unit: 1 s, Range: [0 to 232 - 1], Default: 1
Response:	no response

Sets the time base of the velocity and the acceleration of the Silent Stepper Bricklet 2.0.

For example, if you want to make one step every 1.5 seconds, you can set the time base to 15 and the velocity to 10. Now the velocity is 10steps/15s = 1steps/1.5s.

BrickletSilentStepperV2.get_time_base¶

Function ID:	44
Request:	empty payload
Response:	time_base – Type: uint32, Unit: 1 s, Range: [0 to 232 - 1], Default: 1

Returns the time base as set by set_time_base.

BrickletSilentStepperV2.get_all_data¶

Function ID:	45
Request:	empty payload
Response:	current_velocity – Type: uint16, Unit: 1 1/s, Range: [0 to 216 - 1] current_position – Type: int32, Range: [-231 to 231 - 1] remaining_steps – Type: int32, Range: [-231 to 231 - 1] input_voltage – Type: uint16, Unit: 1 mV, Range: [0 to 216 - 1] current_consumption – Type: uint16, Unit: 1 mA, Range: [0 to 216 - 1]

Returns the following parameters: The current velocity, the current position, the remaining steps, the stack voltage, the external voltage and the current consumption of the stepper motor.

The current consumption is calculated by multiplying the Actual Motor Current value (see set_basic_configuration) with the Motor Run Current (see get_driver_status). This is an internal calculation of the driver, not an independent external measurement.

The current consumption calculation was broken up to firmware 2.0.1, it is fixed since firmware 2.0.2.

There is also a callback for this function, see CALLBACK_ALL_DATA callback.

BrickletSilentStepperV2.get_spitfp_error_count¶

Function ID:	234
Request:	empty payload
Response:	error_count_ack_checksum – Type: uint32, Range: [0 to 232 - 1] error_count_message_checksum – Type: uint32, Range: [0 to 232 - 1] error_count_frame – Type: uint32, Range: [0 to 232 - 1] error_count_overflow – Type: uint32, Range: [0 to 232 - 1]

Returns the error count for the communication between Brick and Bricklet.

The errors are divided into

• ACK checksum errors,
• message checksum errors,
• framing errors and
• overflow errors.

The errors counts are for errors that occur on the Bricklet side. All Bricks have a similar function that returns the errors on the Brick side.

BrickletSilentStepperV2.set_status_led_config¶

Function ID:	239
Request:	config – Type: uint8, Range: See meanings, Default: 3
Response:	no response

Sets the status LED configuration. By default the LED shows communication traffic between Brick and Bricklet, it flickers once for every 10 received data packets.

You can also turn the LED permanently on/off or show a heartbeat.

If the Bricklet is in bootloader mode, the LED is will show heartbeat by default.

The following meanings are defined for the elements of this function:

For config:

• 0 = Off
• 1 = On
• 2 = Show Heartbeat
• 3 = Show Status

BrickletSilentStepperV2.get_status_led_config¶

Function ID:	240
Request:	empty payload
Response:	config – Type: uint8, Range: See meanings, Default: 3

Returns the configuration as set by set_status_led_config

The following meanings are defined for the elements of this function:

For config:

• 0 = Off
• 1 = On
• 2 = Show Heartbeat
• 3 = Show Status

BrickletSilentStepperV2.get_chip_temperature¶

Function ID:	242
Request:	empty payload
Response:	temperature – Type: int16, Unit: 1 °C, Range: [-215 to 215 - 1]

Returns the temperature as measured inside the microcontroller. The value returned is not the ambient temperature!

The temperature is only proportional to the real temperature and it has bad accuracy. Practically it is only useful as an indicator for temperature changes.

BrickletSilentStepperV2.reset¶

Function ID:	243
Request:	empty payload
Response:	no response

Calling this function will reset the Bricklet. All configurations will be lost.

After a reset you have to create new device objects, calling functions on the existing ones will result in undefined behavior!

BrickletSilentStepperV2.get_identity¶

Function ID:	255
Request:	empty payload
Response:	uid – Type: char[8] connected_uid – Type: char[8] position – Type: char, Range: ['a' to 'h', 'z'] hardware_version – Type: uint8[3] 0: major – Type: uint8, Range: [0 to 255] 1: minor – Type: uint8, Range: [0 to 255] 2: revision – Type: uint8, Range: [0 to 255] firmware_version – Type: uint8[3] 0: major – Type: uint8, Range: [0 to 255] 1: minor – Type: uint8, Range: [0 to 255] 2: revision – Type: uint8, Range: [0 to 255] device_identifier – Type: uint16, Range: [0 to 216 - 1]

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c', 'd', 'e', 'f', 'g' or 'h' (Bricklet Port). A Bricklet connected to an Isolator Bricklet is always at position 'z'.

The device identifier numbers can be found here. 

Callback Configuration Functions¶

BrickletSilentStepperV2.set_minimum_voltage¶

Function ID:	39
Request:	voltage – Type: uint16, Unit: 1 mV, Range: [0 to 216 - 1], Default: 8000
Response:	no response

Sets the minimum voltage, below which the CALLBACK_UNDER_VOLTAGE callback is triggered. The minimum possible value that works with the Silent Stepper Bricklet 2.0 is 8V. You can use this function to detect the discharge of a battery that is used to drive the stepper motor. If you have a fixed power supply, you likely do not need this functionality.

BrickletSilentStepperV2.get_minimum_voltage¶

Function ID:	40
Request:	empty payload
Response:	voltage – Type: uint16, Unit: 1 mV, Range: [0 to 216 - 1], Default: 8000

Returns the minimum voltage as set by set_minimum_voltage.

BrickletSilentStepperV2.set_all_callback_configuration¶

Function ID:	46
Request:	period – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0
Response:	no response

Sets the period with which the CALLBACK_ALL_DATA callback is triggered periodically. A value of 0 turns the callback off.

BrickletSilentStepperV2.get_all_data_callback_configuraton¶

Function ID:	47
Request:	empty payload
Response:	period – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0

Returns the period as set by set_all_callback_configuration.

Callbacks¶

BrickletSilentStepperV2.CALLBACK_UNDER_VOLTAGE¶

Function ID:	41
Response:	voltage – Type: uint16, Unit: 1 mV, Range: [0 to 216 - 1]

This callback is triggered when the input voltage drops below the value set by set_minimum_voltage. The response value is the current voltage.

BrickletSilentStepperV2.CALLBACK_POSITION_REACHED¶

Function ID:	42
Response:	position – Type: int32, Range: [-231 to 231 - 1]

This callback is triggered when a position set by set_steps or set_target_position is reached.

Note

Since we can't get any feedback from the stepper motor, this only works if the acceleration (see set_speed_ramping) is set smaller or equal to the maximum acceleration of the motor. Otherwise the motor will lag behind the control value and the callback will be triggered too early.

BrickletSilentStepperV2.CALLBACK_ALL_DATA¶

Function ID:	53
Response:	current_velocity – Type: uint16, Unit: 1 1/s, Range: [0 to 216 - 1] current_position – Type: int32, Range: [-231 to 231 - 1] remaining_steps – Type: int32, Range: [-231 to 231 - 1] input_voltage – Type: uint16, Unit: 1 mV, Range: [0 to 216 - 1] current_consumption – Type: uint16, Unit: 1 mA, Range: [0 to 216 - 1]

This callback is triggered periodically with the period that is set by set_all_callback_configuration. The response values are: the current velocity, the current position, the remaining steps, the stack voltage, the external voltage and the current consumption of the stepper motor.

BrickletSilentStepperV2.CALLBACK_NEW_STATE¶

Function ID:	54
Response:	state_new – Type: uint8, Range: See meanings state_previous – Type: uint8, Range: See meanings

This callback is triggered whenever the Silent Stepper Bricklet 2.0 enters a new state. It returns the new state as well as the previous state.

The following meanings are defined for the elements of this function:

For state_new:

• 1 = Stop
• 2 = Acceleration
• 3 = Run
• 4 = Deacceleration
• 5 = Direction Change To Forward
• 6 = Direction Change To Backward

For state_previous:

• 1 = Stop
• 2 = Acceleration
• 3 = Run
• 4 = Deacceleration
• 5 = Direction Change To Forward
• 6 = Direction Change To Backward

BrickletSilentStepperV2.CALLBACK_GPIO_STATE¶

Function ID:	55
Response:	gpio_state – Type: bool[2]

This callback is triggered by GPIO changes if it is activated through set_gpio_action.

Internal Functions¶

Internal functions are used for maintenance tasks such as flashing a new firmware of changing the UID of a Bricklet. These task should be performed using Brick Viewer instead of using the internal functions directly.

BrickletSilentStepperV2.set_bootloader_mode¶

Function ID:	235
Request:	mode – Type: uint8, Range: See meanings
Response:	status – Type: uint8, Range: See meanings

Sets the bootloader mode and returns the status after the requested mode change was instigated.

You can change from bootloader mode to firmware mode and vice versa. A change from bootloader mode to firmware mode will only take place if the entry function, device identifier and CRC are present and correct.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

The following meanings are defined for the elements of this function:

For mode:

• 0 = Bootloader
• 1 = Firmware
• 2 = Bootloader Wait For Reboot
• 3 = Firmware Wait For Reboot
• 4 = Firmware Wait For Erase And Reboot

For status:

• 0 = OK
• 1 = Invalid Mode
• 2 = No Change
• 3 = Entry Function Not Present
• 4 = Device Identifier Incorrect
• 5 = CRC Mismatch

BrickletSilentStepperV2.get_bootloader_mode¶

Function ID:	236
Request:	empty payload
Response:	mode – Type: uint8, Range: See meanings

Returns the current bootloader mode, see set_bootloader_mode.

The following meanings are defined for the elements of this function:

For mode:

• 0 = Bootloader
• 1 = Firmware
• 2 = Bootloader Wait For Reboot
• 3 = Firmware Wait For Reboot
• 4 = Firmware Wait For Erase And Reboot

BrickletSilentStepperV2.set_write_firmware_pointer¶

Function ID:	237
Request:	pointer – Type: uint32, Unit: 1 B, Range: [0 to 232 - 1]
Response:	no response

Sets the firmware pointer for write_firmware. The pointer has to be increased by chunks of size 64. The data is written to flash every 4 chunks (which equals to one page of size 256).

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

BrickletSilentStepperV2.write_firmware¶

Function ID:	238
Request:	data – Type: uint8[64], Range: [0 to 255]
Response:	status – Type: uint8, Range: [0 to 255]

Writes 64 Bytes of firmware at the position as written by set_write_firmware_pointer before. The firmware is written to flash every 4 chunks.

You can only write firmware in bootloader mode.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

BrickletSilentStepperV2.write_uid¶

Function ID:	248
Request:	uid – Type: uint32, Range: [0 to 232 - 1]
Response:	no response

Writes a new UID into flash. If you want to set a new UID you have to decode the Base58 encoded UID string into an integer first.

We recommend that you use Brick Viewer to change the UID.

BrickletSilentStepperV2.read_uid¶

Function ID:	249
Request:	empty payload
Response:	uid – Type: uint32, Range: [0 to 232 - 1]

Returns the current UID as an integer. Encode as Base58 to get the usual string version.