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Showing content from https://circuitpython.readthedocs.io/projects/blinka/en/latest/api.html below:

Runtime utility objects for re-implementation of CircuitPython API — Adafruit Blinka Library 1.0.0 documentation

• Author(s): cefn

class adafruit_blinka.ContextManaged¶

An object that automatically deinitializes hardware with a context manager.

deinit()¶

Free any hardware used by the object.

class adafruit_blinka.Enum¶

Object supporting CircuitPython-style of static symbols as seen with Direction.OUTPUT, Pull.UP

classmethod iteritems()¶

Inspects attributes of the class for instances of the class and returns as key,value pairs mirroring dict#iteritems

class adafruit_blinka.Lockable¶

An object that must be locked to prevent collisions on a microcontroller resource.

try_lock()¶

Attempt to grab the lock. Return True on success, False if the lock is already taken.

unlock()¶

Release the lock so others may use the resource.

adafruit_blinka.patch_system()¶

Patch modules that may be different due to the platform.

Allows useful indirection to test Pin naming logic by switching platform in testing or provide bootstrapping logic for board identification where auto-detection is not feasible (e.g. multiple ESP8266 boards architecturally identical). Once runtime environment is established, can choose various routes to make available and re-export common modules and operations, depending on platform support

See analogio in CircuitPython for more details. Not supported by all boards.

• Author(s): Carter Nelson, Melissa LeBlanc-Williams

See bitbangio in CircuitPython for more details.

• Author(s): cefn

class bitbangio.I2C(scl, sda, frequency=400000)¶

Bitbang/Software I2C implementation

deinit()¶

Deinitialization

init(scl, sda, frequency)¶

Initialization

readfrom_into(address, buffer, start=0, end=None)¶

Read from a device at specified address into a buffer

scan()¶

Scan for attached devices

writeto(address, buffer, start=0, end=None, stop=True)¶

Write to a device at specified address from a buffer

class bitbangio.SPI(clock, MOSI=None, MISO=None)¶

Bitbang/Software SPI implementation

configure(baudrate=100000, polarity=0, phase=0, bits=8)¶

Update the configuration

readinto(buf)¶

Read from the SPI device into a buffer

write(buf)¶

Write to the SPI device

write_readinto(buffer_out, buffer_in)¶

Write to the SPI device and read from the SPI device into a buffer

See board in CircuitPython for more details.

• Author(s): cefn

See busio in CircuitPython for more details.

• Author(s): cefn

class busio.I2C(scl, sda, frequency=100000)¶

Busio I2C Class for CircuitPython Compatibility. Used for both MicroPython and Linux.

NOTE: Frequency has no effect on Linux systems. The argument is only there for compatibility.

deinit()¶

Deinitialization

init(scl, sda, frequency)¶

Initialization

readfrom_into(address, buffer, *, start=0, end=None)¶

Read from a device at specified address into a buffer

scan()¶

Scan for attached devices

writeto(address, buffer, *, start=0, end=None)¶

Write to a device at specified address from a buffer

writeto_then_readfrom(address, buffer_out, buffer_in, *, out_start=0, out_end=None, in_start=0, in_end=None, stop=False)¶

“Write to a device at specified address from a buffer then read from a device at specified address into a buffer

class busio.SPI(clock, MOSI=None, MISO=None)¶

Busio SPI Class for CircuitPython Compatibility. Used for both MicroPython and Linux.

configure(baudrate=100000, polarity=0, phase=0, bits=8)¶

Update the configuration

deinit()¶

Deinitialization

property frequency¶

Return the baud rate if implemented

readinto(buf, start=0, end=None, write_value=0)¶

Read from the SPI device into a buffer

write(buf, start=0, end=None)¶

Write to the SPI device

write_readinto(buffer_out, buffer_in, out_start=0, out_end=None, in_start=0, in_end=None)¶

Write to the SPI device and read from the SPI device into a buffer

class busio.UART(tx, rx, baudrate=9600, bits=8, parity=None, stop=1, timeout=1000, receiver_buffer_size=64, flow=None)¶

Busio UART Class for CircuitPython Compatibility. Used for MicroPython and a few other non-Linux boards.

class Parity¶

Parity Enumeration

deinit()¶

Deinitialization

read(nbytes=None)¶

Read from the UART

readinto(buf, nbytes=None)¶

Read from the UART into a buffer

readline()¶

Read a line of characters up to a newline character from the UART

write(buf)¶

Write to the UART from a buffer

See digitalio in CircuitPython for more details.

• Author(s): cefn

class digitalio.DigitalInOut(pin)¶

DigitalInOut CircuitPython compatibility implementation

deinit()¶

Deinitialize the Digital Pin

property direction¶

Get or Set the Digital Pin Direction

property drive_mode¶

The Digital Pin Drive Mode

property pull¶

The pin pull direction

switch_to_input(pull=None)¶

Switch the Digital Pin Mode to Input

switch_to_output(value=False, drive_mode=digitalio.DriveMode.PUSH_PULL)¶

Switch the Digital Pin Mode to Output

property value¶

The Digital Pin Value

class digitalio.Direction¶

Direction Enumeration

class digitalio.DriveMode¶

Drive Mode Enumeration

class digitalio.Pull¶

PullUp/PullDown Enumeration

See keypad in CircuitPython for more details.

• Author(s): Melissa LeBlanc-Williams

class keypad.Event(key_number=0, pressed=True)¶

A key transition event.

property key_number¶

The key number.

property pressed¶

True if the event represents a key down (pressed) transition. The opposite of released.

property released¶

True if the event represents a key up (released) transition. The opposite of pressed.

class keypad.EventQueue(max_events)¶

A queue of Event objects, filled by a keypad scanner such as Keys or KeyMatrix.

You cannot create an instance of EventQueue directly. Each scanner creates an instance when it is created.

clear()¶

Clear any queued key transition events. Also sets overflowed to False.

get()¶

Return the next key transition event. Return None if no events are pending.

Note that the queue size is limited; see max_events in the constructor of a scanner such as Keys or KeyMatrix. If a new event arrives when the queue is full, the event is discarded, and overflowed is set to True.

Returns:

the next queued key transition Event

Return type:

Optional[Event]

get_into(event)¶

Store the next key transition event in the supplied event, if available, and return True. If there are no queued events, do not touch event and return False.

The advantage of this method over get() is that it does not allocate storage. Instead you can reuse an existing Event object.

Note that the queue size is limited; see max_events in the constructor of a scanner such as Keys or KeyMatrix.

:return True if an event was available and stored, False if not. :rtype: bool

keypad_eventqueue_record(key_number, current)¶

Record a new event

property overflowed¶

True if an event could not be added to the event queue because it was full. (read-only) Set to False by clear().

class keypad.KeyMatrix(row_pins, column_pins, columns_to_anodes=True, interval=0.02, max_events=64)¶

Manage a 2D matrix of keys with row and column pins.

deinit()¶

Stop scanning and release the pins.

property key_count¶

The number of keys that are being scanned. (read-only)

reset()¶

Reset the internal state of the scanner to assume that all keys are now released. Any key that is already pressed at the time of this call will therefore immediately cause a new key-pressed event to occur.

class keypad.Keys(pins, *, value_when_pressed, pull=True, interval=0.02, max_events=64)¶

Manage a set of independent keys.

deinit()¶

Stop scanning and release the pins.

property key_count¶

The number of keys that are being scanned. (read-only)

reset()¶

Reset the internal state of the scanner to assume that all keys are now released. Any key that is already pressed at the time of this call will therefore immediately cause a new key-pressed event to occur.

class keypad.ShiftRegisterKeys(*, clock, data, latch, value_to_latch=True, key_count, value_when_pressed, interval=0.02, max_events=64)¶

Manage a set of keys attached to an incoming shift register.

deinit()¶

Stop scanning and release the pins.

property events¶

The EventQueue associated with this Keys object. (read-only)

property key_count¶

The number of keys that are being scanned. (read-only)

reset()¶

Reset the internal state of the scanner to assume that all keys are now released. Any key that is already pressed at the time of this call will therefore immediately cause a new key-pressed event to occur.

• Author(s): Melissa LeBlanc-Williams

microcontroller.delay_us(delay)¶

Sleep for delay usecs.

• Author(s): cefn

micropython.asm_thumb(f)¶

User is attempting to use an inline assembler

micropython.const(x)¶

Emulate making a constant

micropython.native(f)¶

Emulate making a native

micropython.viper(f)¶

User is attempting to use a viper code emitter

See neopixel_write in CircuitPython for more details. Currently supported on Raspberry Pi only.

• Author(s): ladyada

neopixel_write.neopixel_write(gpio, buf)¶

Write buf out on the given DigitalInOut.

See onewireio in CircuitPython for more details.

• Author(s): cefn

class onewireio.OneWire(pin)¶

Stub class for OneWire, which is currently not implemented

deinit()¶

Deinitialize the OneWire bus and release any hardware resources for reuse.

read_bit()¶

Read in a bit

reset()¶

Reset the OneWire bus and read presence

write_bit(value)¶

Write out a bit based on value.

See pulseio in CircuitPython for more details. Not supported by all boards.

• Author(s): Melissa LeBlanc-Williams

See pwmio in CircuitPython for more details. Not supported by all boards.

• Author(s): Melissa LeBlanc-Williams

See rainbowio in CircuitPython for more details. Not supported by all boards.

• Author(s): Kattni Rembor, Carter Nelson

rainbowio.colorwheel(color_value)¶

A colorwheel. 0 and 255 are red, 85 is green, and 170 is blue, with the values between being the rest of the rainbow.

Parameters:

color_value (int) – 0-255 of color value to return

Returns:

tuple of RGB values

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