Shell - Hall Effect Bricklet 2.0¶

Counter¶

Download (example-counter.sh)

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#!/bin/sh
# Connects to localhost:4223 by default, use --host and --port to change this

uid=XYZ # Change XYZ to the UID of your Hall Effect Bricklet 2.0

# Get current count without counter reset
tinkerforge call hall-effect-v2-bricklet $uid get-counter false

Magnetic Flux Density¶

Download (example-magnetic-flux-density.sh)

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#!/bin/sh
# Connects to localhost:4223 by default, use --host and --port to change this

uid=XYZ # Change XYZ to the UID of your Hall Effect Bricklet 2.0

# Get current Magnetic Flux Density
tinkerforge call hall-effect-v2-bricklet $uid get-magnetic-flux-density

Counter Callback¶

Download (example-counter-callback.sh)

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#!/bin/sh
# Connects to localhost:4223 by default, use --host and --port to change this

uid=XYZ # Change XYZ to the UID of your Hall Effect Bricklet 2.0

# Configure counter with ±3000µT threshold and 10ms debounce
tinkerforge call hall-effect-v2-bricklet $uid set-counter-config 3000 -3000 10000

# Handle incoming counter callbacks
tinkerforge dispatch hall-effect-v2-bricklet $uid counter &

# Set period for counter callback to 0.1s (100ms)
tinkerforge call hall-effect-v2-bricklet $uid set-counter-callback-configuration 100 true

echo "Press key to exit"; read dummy

kill -- -$$ # Stop callback dispatch in background

Command Structure¶

The common options of the call and dispatch commands are documented here. The specific command structure is shown below.

tinkerforge call hall-effect-v2-bricklet [<option>..] <uid> <function> [<argument>..]¶

Parameters:	<uid> – Type: String <function> – Type: String

The call command is used to call a function of the Hall Effect Bricklet 2.0. It can take several options:

• --help shows help for the specific call command and exits
• --list-functions shows a list of known functions of the Hall Effect Bricklet 2.0 and exits

tinkerforge dispatch hall-effect-v2-bricklet [<option>..] <uid> <callback>¶

Parameters:	<uid> – Type: String <callback> – Type: String

The dispatch command is used to dispatch a callback of the Hall Effect Bricklet 2.0. It can take several options:

• --help shows help for the specific dispatch command and exits
• --list-callbacks shows a list of known callbacks of the Hall Effect Bricklet 2.0 and exits

tinkerforge call hall-effect-v2-bricklet <uid> <function> [<option>..] [<argument>..]¶

Parameters:	<uid> – Type: String <function> – Type: String

The <function> to be called can take different options depending of its kind. All functions can take the following options:

• --help shows help for the specific function and exits

Getter functions can take the following options:

• --execute <command> shell command line to execute for each incoming response (see section about output formatting for details)

Setter functions can take the following options:

• --expect-response requests response and waits for it

The --expect-response option for setter functions allows to detect timeouts and other error conditions calls of setters as well. The device will then send a response for this purpose. If this option is not given for a setter function then no response is sent and errors are silently ignored, because they cannot be detected.

tinkerforge dispatch hall-effect-v2-bricklet <uid> <callback> [<option>..]¶

Parameters:	<uid> – Type: String <callback> – Type: String

The <callback> to be dispatched can take several options:

• --help shows help for the specific callback and exits
• --execute <command> shell command line to execute for each incoming response (see section about output formatting for details)

Basic Functions¶

tinkerforge call hall-effect-v2-bricklet <uid> get-magnetic-flux-density¶

Output:	magnetic-flux-density – Type: Int, Unit: 1 µT, Range: [-7000 to 7000]

Returns the magnetic flux density (magnetic induction).

If you want to get the value periodically, it is recommended to use the magnetic-flux-density callback. You can set the callback configuration with set-magnetic-flux-density-callback-configuration.

tinkerforge call hall-effect-v2-bricklet <uid> get-counter <reset-counter>¶

Parameters:	<reset-counter> – Type: Bool
Output:	count – Type: Int, Range: [0 to 232 - 1]

Returns the current value of the counter.

You can configure the low/high thresholds and the debounce time with set-counter-config.

If you set reset counter to true, the count is set back to 0 directly after it is read.

If you want to get the count periodically, it is recommended to use the counter callback. You can set the callback configuration with set-counter-callback-configuration.

tinkerforge call hall-effect-v2-bricklet <uid> set-counter-config <high-threshold> <low-threshold> <debounce>¶

Parameters:	<high-threshold> – Type: Int, Unit: 1 µT, Range: [-215 to 215 - 1], Default: 2000 <low-threshold> – Type: Int, Unit: 1 µT, Range: [-215 to 215 - 1], Default: -2000 <debounce> – Type: Int, Unit: 1 µs, Range: [0 to 1000000], Default: 100000
Output:	no output

Sets a high and a low threshold as well as a debounce time.

If the measured magnetic flux density goes above the high threshold or below the low threshold, the count of the counter is increased by 1.

The debounce time is the minimum time between two count increments.

tinkerforge call hall-effect-v2-bricklet <uid> get-counter-config¶

Output:	high-threshold – Type: Int, Unit: 1 µT, Range: [-215 to 215 - 1], Default: 2000 low-threshold – Type: Int, Unit: 1 µT, Range: [-215 to 215 - 1], Default: -2000 debounce – Type: Int, Unit: 1 µs, Range: [0 to 1000000], Default: 100000

Returns the counter config as set by set-counter-config.

Advanced Functions¶

tinkerforge call hall-effect-v2-bricklet <uid> get-spitfp-error-count¶

Output:	error-count-ack-checksum – Type: Int, Range: [0 to 232 - 1] error-count-message-checksum – Type: Int, Range: [0 to 232 - 1] error-count-frame – Type: Int, Range: [0 to 232 - 1] error-count-overflow – Type: Int, 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.

tinkerforge call hall-effect-v2-bricklet <uid> set-status-led-config <config>¶

Parameters:	<config> – Type: Int, Range: See symbols, Default: 3
Output:	no output

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 symbols are available for this function:

For <config>:

• status-led-config-off = 0
• status-led-config-on = 1
• status-led-config-show-heartbeat = 2
• status-led-config-show-status = 3

tinkerforge call hall-effect-v2-bricklet <uid> get-status-led-config¶

Output:	config – Type: Int, Range: See symbols, Default: 3

Returns the configuration as set by set-status-led-config

The following symbols are available for this function:

For config:

• status-led-config-off = 0
• status-led-config-on = 1
• status-led-config-show-heartbeat = 2
• status-led-config-show-status = 3

tinkerforge call hall-effect-v2-bricklet <uid> get-chip-temperature¶

Output:	temperature – Type: Int, 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.

tinkerforge call hall-effect-v2-bricklet <uid> reset¶

Output:	no output

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!

tinkerforge call hall-effect-v2-bricklet <uid> get-identity¶

Output:

uid – Type: String, Length: up to 8 connected-uid – Type: String, Length: up to 8 position – Type: Char, Range: [a to h, z] hardware-version – Type: Int Array, Length: 3 0: major – Type: Int, Range: [0 to 255] 1: minor – Type: Int, Range: [0 to 255] 2: revision – Type: Int, Range: [0 to 255] firmware-version – Type: Int Array, Length: 3 0: major – Type: Int, Range: [0 to 255] 1: minor – Type: Int, Range: [0 to 255] 2: revision – Type: Int, Range: [0 to 255] device-identifier – Type: Int, 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¶

tinkerforge call hall-effect-v2-bricklet <uid> set-magnetic-flux-density-callback-configuration <period> <value-has-to-change> <option> <min> <max>¶

Parameters:	<period> – Type: Int, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 <value-has-to-change> – Type: Bool, Default: false <option> – Type: Char, Range: See symbols, Default: x <min> – Type: Int, Unit: 1 µT, Range: [-215 to 215 - 1], Default: 0 <max> – Type: Int, Unit: 1 µT, Range: [-215 to 215 - 1], Default: 0
Output:	no output

The period is the period with which the magnetic-flux-density callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after the value has changed. If the value didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

It is furthermore possible to constrain the callback with thresholds.

The option-parameter together with min/max sets a threshold for the magnetic-flux-density callback.

The following options are possible:

Option	Description
'x'	Threshold is turned off
'o'	Threshold is triggered when the value is outside the min and max values
'i'	Threshold is triggered when the value is inside or equal to the min and max values
'<'	Threshold is triggered when the value is smaller than the min value (max is ignored)
'>'	Threshold is triggered when the value is greater than the min value (max is ignored)

If the option is set to 'x' (threshold turned off) the callback is triggered with the fixed period.

The following symbols are available for this function:

For <option>:

• threshold-option-off = x
• threshold-option-outside = o
• threshold-option-inside = i
• threshold-option-smaller = <
• threshold-option-greater = >

tinkerforge call hall-effect-v2-bricklet <uid> get-magnetic-flux-density-callback-configuration¶

Output:	period – Type: Int, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 value-has-to-change – Type: Bool, Default: false option – Type: Char, Range: See symbols, Default: x min – Type: Int, Unit: 1 µT, Range: [-215 to 215 - 1], Default: 0 max – Type: Int, Unit: 1 µT, Range: [-215 to 215 - 1], Default: 0

Returns the callback configuration as set by set-magnetic-flux-density-callback-configuration.

The following symbols are available for this function:

For option:

• threshold-option-off = x
• threshold-option-outside = o
• threshold-option-inside = i
• threshold-option-smaller = <
• threshold-option-greater = >

tinkerforge call hall-effect-v2-bricklet <uid> set-counter-callback-configuration <period> <value-has-to-change>¶

Parameters:	<period> – Type: Int, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 <value-has-to-change> – Type: Bool, Default: false
Output:	no output

The period is the period with which the counter callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after at least one of the values has changed. If the values didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

tinkerforge call hall-effect-v2-bricklet <uid> get-counter-callback-configuration¶

Output:	period – Type: Int, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 value-has-to-change – Type: Bool, Default: false

Returns the callback configuration as set by set-counter-callback-configuration.

Callbacks¶

Callbacks can be used to receive time critical or recurring data from the device:

tinkerforge dispatch hall-effect-v2-bricklet <uid> example

The available callbacks are described below.

tinkerforge dispatch hall-effect-v2-bricklet <uid> magnetic-flux-density¶

Output:	magnetic-flux-density – Type: Int, Unit: 1 µT, Range: [-7000 to 7000]

This callback is triggered periodically according to the configuration set by set-magnetic-flux-density-callback-configuration.

The parameter is the same as get-magnetic-flux-density.

tinkerforge dispatch hall-effect-v2-bricklet <uid> counter¶

Output:	count – Type: Int, Range: [0 to 232 - 1]

This callback is triggered periodically according to the configuration set by set-counter-callback-configuration.

The count is the same as you would get with get-counter.

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.

tinkerforge call hall-effect-v2-bricklet <uid> set-bootloader-mode <mode>¶

Parameters:	<mode> – Type: Int, Range: See symbols
Output:	status – Type: Int, Range: See symbols

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 symbols are available for this function:

For <mode>:

• bootloader-mode-bootloader = 0
• bootloader-mode-firmware = 1
• bootloader-mode-bootloader-wait-for-reboot = 2
• bootloader-mode-firmware-wait-for-reboot = 3
• bootloader-mode-firmware-wait-for-erase-and-reboot = 4

For status:

• bootloader-status-ok = 0
• bootloader-status-invalid-mode = 1
• bootloader-status-no-change = 2
• bootloader-status-entry-function-not-present = 3
• bootloader-status-device-identifier-incorrect = 4
• bootloader-status-crc-mismatch = 5

tinkerforge call hall-effect-v2-bricklet <uid> get-bootloader-mode¶

Output:	mode – Type: Int, Range: See symbols

Returns the current bootloader mode, see set-bootloader-mode.

The following symbols are available for this function:

For mode:

• bootloader-mode-bootloader = 0
• bootloader-mode-firmware = 1
• bootloader-mode-bootloader-wait-for-reboot = 2
• bootloader-mode-firmware-wait-for-reboot = 3
• bootloader-mode-firmware-wait-for-erase-and-reboot = 4

tinkerforge call hall-effect-v2-bricklet <uid> set-write-firmware-pointer <pointer>¶

Parameters:	<pointer> – Type: Int, Unit: 1 B, Range: [0 to 232 - 1]
Output:	no output

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.

tinkerforge call hall-effect-v2-bricklet <uid> write-firmware <data>¶

Parameters:	<data> – Type: Int Array, Length: 64, Range: [0 to 255]
Output:	status – Type: Int, 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.

tinkerforge call hall-effect-v2-bricklet <uid> write-uid <uid>¶

Parameters:	<uid> – Type: Int, Range: [0 to 232 - 1]
Output:	no output

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.

tinkerforge call hall-effect-v2-bricklet <uid> read-uid¶

Output:	uid – Type: Int, Range: [0 to 232 - 1]

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