supervisor – Supervisor settings

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supervisor.runtime: Runtime

Runtime information, such as runtime.serial_connected (USB serial connection status). This object is the sole instance of supervisor.Runtime.

supervisor.status_bar: StatusBar

The status bar, shown on an attached display, and also sent to an attached terminal via OSC escape codes over the REPL serial connection. The status bar reports the current IP or BLE connection, what file is running, the last exception name and location, and firmware version information. This object is the sole instance of supervisor.StatusBar.

supervisor.reload() None

Reload the main Python code and run it (equivalent to hitting Ctrl-D at the REPL).

supervisor.set_next_code_file(filename: str | None, *, reload_on_success: bool = False, reload_on_error: bool = False, sticky_on_success: bool = False, sticky_on_error: bool = False, sticky_on_reload: bool = False) None

Set what file to run on the next vm run.

When not None, the given filename is inserted at the front of the usual [‘code.py’, ‘main.py’] search sequence.

The optional keyword arguments specify what happens after the specified file has run:

sticky_on_… determine whether the newly set filename and options stay in effect: If True, further runs will continue to run that file (unless it says otherwise by calling set_next_code_filename() itself). If False, the settings will only affect one run and revert to the standard code.py/main.py afterwards.

reload_on_… determine how to continue: If False, wait in the usual “Code done running. Waiting for reload. / Press any key to enter the REPL. Use CTRL-D to reload.” state. If True, reload immediately as if CTRL-D was pressed.

…_on_success take effect when the program runs to completion or calls sys.exit().

…_on_error take effect when the program exits with an exception, including the KeyboardInterrupt caused by CTRL-C.

…_on_reload take effect when the program is interrupted by files being written to the USB drive (auto-reload) or when it calls supervisor.reload().

These settings are stored in RAM, not in persistent memory, and will therefore only affect soft reloads. Powering off or resetting the device will always revert to standard settings.

When called multiple times in the same run, only the last call takes effect, replacing any settings made by previous ones. This is the main use of passing None as a filename: to reset to the standard search sequence.

supervisor.ticks_ms() int

Return the time in milliseconds since an unspecified reference point, wrapping after 2**29ms.

The value is initialized so that the first overflow occurs about 65 seconds after power-on, making it feasible to check that your program works properly around an overflow.

The wrap value was chosen so that it is always possible to add or subtract two ticks_ms values without overflow on a board without long ints (or without allocating any long integer objects, on boards with long ints).

This ticks value comes from a low-accuracy clock internal to the microcontroller, just like time.monotonic. Due to its low accuracy and the fact that it “wraps around” every few days, it is intended for working with short term events like advancing an LED animation, not for long term events like counting down the time until a holiday.

Addition, subtraction, and comparison of ticks values can be done with routines like the following:

_TICKS_PERIOD = const(1<<29)
_TICKS_MAX = const(_TICKS_PERIOD-1)
_TICKS_HALFPERIOD = const(_TICKS_PERIOD//2)

def ticks_add(ticks, delta):
    "Add a delta to a base number of ticks, performing wraparound at 2**29ms."
    return (ticks + delta) % _TICKS_PERIOD

def ticks_diff(ticks1, ticks2):
    "Compute the signed difference between two ticks values, assuming that they are within 2**28 ticks"
    diff = (ticks1 - ticks2) & _TICKS_MAX
    diff = ((diff + _TICKS_HALFPERIOD) & _TICKS_MAX) - _TICKS_HALFPERIOD
    return diff

def ticks_less(ticks1, ticks2):
    "Return true iff ticks1 is less than ticks2, assuming that they are within 2**28 ticks"
    return ticks_diff(ticks1, ticks2) < 0
supervisor.get_previous_traceback() str | None

If the last vm run ended with an exception (including the KeyboardInterrupt caused by CTRL-C), returns the traceback as a string. Otherwise, returns None.

An exception traceback is only preserved over a soft reload, a hard reset clears it.

Only code (main or boot) runs are considered, not REPL runs.

supervisor.reset_terminal(x_pixels: int, y_pixels: int) None

Reset the CircuitPython serial terminal with new dimensions.

supervisor.set_usb_identification(manufacturer: str | None = None, product: str | None = None, vid: int = -1, pid: int = -1) None

Override identification constants in the USB Device Descriptor.

If passed, manufacturer and product must be ASCII strings (or buffers) of at most 126 characters. Any omitted arguments will be left at their default values.

This method must be called in boot.py to have any effect.

Not available on boards without native USB support.

class supervisor.RunReason

The reason that CircuitPython started running.

STARTUP: object

CircuitPython started the microcontroller started up. See microcontroller.Processor.reset_reason for more detail on why the microcontroller was started.

AUTO_RELOAD: object

CircuitPython restarted due to an external write to the filesystem.

SUPERVISOR_RELOAD: object

CircuitPython restarted due to a call to supervisor.reload().

REPL_RELOAD: object

CircuitPython started due to the user typing CTRL-D in the REPL.

class supervisor.Runtime

Current status of runtime objects.

Usage:

import supervisor
if supervisor.runtime.serial_connected:
    print("Hello World!")

You cannot create an instance of supervisor.Runtime. Use supervisor.runtime to access the sole instance available.

usb_connected: bool

Returns the USB enumeration status (read-only).

serial_connected: bool

Returns the USB serial communication status (read-only).

serial_bytes_available: bool

Returns whether any bytes are available to read on the USB serial input. Allows for polling to see whether to call the built-in input() or wait. (read-only)

run_reason: RunReason

Why CircuitPython started running this particular time (read-only).

safe_mode_reason: SafeModeReason

Why CircuitPython went into safe mode this particular time (read-only).

Limitations: Raises NotImplementedError on builds that do not implement safemode.py.

autoreload: bool

Whether CircuitPython may autoreload based on workflow writes to the filesystem.

ble_workflow: bool

Enable/Disable ble workflow until a reset. This prevents BLE advertising outside of the VM and the services used for it.

rgb_status_brightness: int

Set brightness of status RGB LED from 0-255. This will take effect after the current code finishes and the status LED is used to show the finish state.

class supervisor.SafeModeReason

The reason that CircuitPython went into safe mode.

Limitations: Class not available on builds that do not implement safemode.py.

NONE: object

CircuitPython is not in safe mode.

BROWNOUT: object

The microcontroller voltage dropped too low.

FLASH_WRITE_FAIL: object

Could not write to flash memory.

GC_ALLOC_OUTSIDE_VM: object

CircuitPython tried to allocate storage when its virtual machine was not running.

HARD_FAULT: object

The microcontroller detected a fault, such as an out-of-bounds memory write.

INTERRUPT_ERROR: object

Internal error related to interrupts.

NLR_JUMP_FAIL: object

An error occurred during exception handling, possibly due to memory corruption.

NO_CIRCUITPY: object

The CIRCUITPY drive was not available.

NO_HEAP: object

Heap storage was not present.

PROGRAMMATIC: object

The program entered safe mode using the supervisor module.

SDK_FATAL_ERROR: object

Third party firmware reported a fatal error.

STACK_OVERFLOW: object

The CircuitPython heap was corrupted because the stack was too small.

USB_BOOT_DEVICE_NOT_INTERFACE_ZERO: object

The USB HID boot device was not set up to be the first device, on interface #0.

USB_TOO_MANY_ENDPOINTS: object

USB devices need more endpoints than are available.

USB_TOO_MANY_INTERFACE_NAMES: object

USB devices specify too many interface names.

USER: object

The user pressed one or more buttons to enter safe mode. This safe mode does not cause safemode.py to be run, since its purpose is to prevent all user code from running. This allows errors in safemode.py to be corrected easily.

SAFE_MODE_WATCHDOG: object

An internal watchdog timer expired.

class supervisor.StatusBar

Current status of runtime objects.

Usage:

import supervisor

supervisor.status_bar.console = False

You cannot create an instance of supervisor.StatusBar. Use supervisor.status_bar to access the sole instance available.

console: bool

Whether status bar information is sent over the console (REPL) serial connection, using OSC terminal escape codes that change the terminal’s title. Default is True. If set to False, status bar will be cleared and then disabled. May be set in boot.py or later. Persists across soft restarts.

display: bool

Whether status bar information is displayed on the top line of the display. Default is True. If set to False, status bar will be cleared and then disabled. May be set in boot.py or later. Persists across soft restarts. Not available if terminalio is not available.