613 lines
22 KiB
Python
613 lines
22 KiB
Python
# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
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#
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# SPDX-License-Identifier: MIT
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"""
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`busio` - Bus protocol support like I2C and SPI
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=================================================
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See `CircuitPython:busio` in CircuitPython for more details.
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* Author(s): cefn
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"""
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try:
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import threading
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except ImportError:
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threading = None
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# pylint: disable=unused-import
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import adafruit_platformdetect.constants.boards as ap_board
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import adafruit_platformdetect.constants.chips as ap_chip
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from adafruit_blinka import Enum, Lockable, agnostic
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from adafruit_blinka.agnostic import board_id, detector
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# pylint: disable=import-outside-toplevel,too-many-branches,too-many-statements
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# pylint: disable=too-many-arguments,too-many-function-args,too-many-return-statements
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class I2C(Lockable):
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"""
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Busio I2C Class for CircuitPython Compatibility. Used
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for both MicroPython and Linux.
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NOTE: Frequency has no effect on Linux systems. The argument is only there for compatibility.
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"""
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def __init__(self, scl, sda, frequency=100000):
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self.init(scl, sda, frequency)
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def init(self, scl, sda, frequency):
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"""Initialization"""
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self.deinit()
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if detector.board.ftdi_ft232h:
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from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.i2c import I2C as _I2C
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self._i2c = _I2C(frequency=frequency)
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return
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if detector.board.binho_nova:
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from adafruit_blinka.microcontroller.nova.i2c import I2C as _I2C
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self._i2c = _I2C(frequency=frequency)
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return
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if detector.board.microchip_mcp2221:
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from adafruit_blinka.microcontroller.mcp2221.i2c import I2C as _I2C
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self._i2c = _I2C(frequency=frequency)
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return
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if detector.board.OS_AGNOSTIC_BOARD:
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from adafruit_blinka.microcontroller.generic_agnostic_board.i2c import (
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I2C as _I2C,
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)
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self._i2c = _I2C(frequency=frequency)
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return
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if detector.board.greatfet_one:
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from adafruit_blinka.microcontroller.nxp_lpc4330.i2c import I2C as _I2C
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self._i2c = _I2C(frequency=frequency)
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return
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if detector.board.pico_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.i2c import I2C_Pico as _I2C
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self._i2c = _I2C(scl, sda, frequency=frequency)
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return
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if detector.board.feather_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.i2c import (
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I2C_Feather as _I2C,
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)
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self._i2c = _I2C(scl, sda, frequency=frequency)
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return
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if detector.board.feather_can_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.i2c import (
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I2C_Feather_CAN as _I2C,
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)
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self._i2c = _I2C(scl, sda, frequency=frequency)
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return
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if detector.board.feather_epd_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.i2c import (
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I2C_Feather_EPD as _I2C,
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)
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self._i2c = _I2C(scl, sda, frequency=frequency)
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return
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if detector.board.feather_rfm_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.i2c import (
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I2C_Feather_RFM as _I2C,
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)
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self._i2c = _I2C(scl, sda, frequency=frequency)
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return
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if detector.board.qtpy_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.i2c import I2C_QTPY as _I2C
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self._i2c = _I2C(scl, sda, frequency=frequency)
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return
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if detector.board.itsybitsy_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.i2c import (
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I2C_ItsyBitsy as _I2C,
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)
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self._i2c = _I2C(scl, sda, frequency=frequency)
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return
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if detector.board.macropad_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.i2c import (
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I2C_MacroPad as _I2C,
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)
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self._i2c = _I2C(scl, sda, frequency=frequency)
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return
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if detector.board.qt2040_trinkey_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.i2c import (
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I2C_QT2040_Trinkey as _I2C,
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)
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self._i2c = _I2C(scl, sda, frequency=frequency)
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return
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if detector.board.kb2040_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.i2c import (
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I2C_KB2040 as _I2C,
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)
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self._i2c = _I2C(scl, sda, frequency=frequency)
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return
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if detector.chip.id == ap_chip.RP2040:
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from adafruit_blinka.microcontroller.rp2040.i2c import I2C as _I2C
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self._i2c = _I2C(scl, sda, frequency=frequency)
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return
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if detector.board.any_siemens_iot2000:
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from adafruit_blinka.microcontroller.am65xx.i2c import I2C as _I2C
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self._i2c = _I2C(frequency=frequency)
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return
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if detector.board.any_embedded_linux:
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from adafruit_blinka.microcontroller.generic_linux.i2c import I2C as _I2C
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if frequency == 100000:
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frequency = None # Set to None if default to avoid triggering warning
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elif detector.board.ftdi_ft2232h:
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from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.i2c import I2C as _I2C
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elif detector.board.ftdi_ft4232h:
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from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.i2c import I2C as _I2C
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else:
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from adafruit_blinka.microcontroller.generic_micropython.i2c import (
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I2C as _I2C,
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)
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from microcontroller.pin import i2cPorts
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for portId, portScl, portSda in i2cPorts:
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try:
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# pylint: disable=unexpected-keyword-arg
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if scl == portScl and sda == portSda:
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self._i2c = _I2C(portId, mode=_I2C.MASTER, baudrate=frequency)
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break
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# pylint: enable=unexpected-keyword-arg
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except RuntimeError:
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pass
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else:
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raise ValueError(
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"No Hardware I2C on (scl,sda)={}\nValid I2C ports: {}".format(
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(scl, sda), i2cPorts
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)
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)
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if threading is not None:
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self._lock = threading.RLock()
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def deinit(self):
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"""Deinitialization"""
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try:
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del self._i2c
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except AttributeError:
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pass
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def __enter__(self):
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if threading is not None:
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self._lock.acquire()
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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if threading is not None:
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self._lock.release()
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self.deinit()
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def scan(self):
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"""Scan for attached devices"""
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return self._i2c.scan()
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def readfrom_into(self, address, buffer, *, start=0, end=None):
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"""Read from a device at specified address into a buffer"""
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if start != 0 or end is not None:
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if end is None:
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end = len(buffer)
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buffer = memoryview(buffer)[start:end]
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return self._i2c.readfrom_into(address, buffer, stop=True)
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def writeto(self, address, buffer, *, start=0, end=None):
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"""Write to a device at specified address from a buffer"""
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if isinstance(buffer, str):
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buffer = bytes([ord(x) for x in buffer])
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if start != 0 or end is not None:
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if end is None:
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return self._i2c.writeto(address, memoryview(buffer)[start:], stop=True)
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return self._i2c.writeto(address, memoryview(buffer)[start:end], stop=True)
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return self._i2c.writeto(address, buffer, stop=True)
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def writeto_then_readfrom(
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self,
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address,
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buffer_out,
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buffer_in,
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*,
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out_start=0,
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out_end=None,
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in_start=0,
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in_end=None,
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stop=False,
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):
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""" "Write to a device at specified address from a buffer then read
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from a device at specified address into a buffer
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"""
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return self._i2c.writeto_then_readfrom(
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address,
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buffer_out,
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buffer_in,
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out_start=out_start,
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out_end=out_end,
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in_start=in_start,
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in_end=in_end,
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stop=stop,
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)
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class SPI(Lockable):
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"""
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Busio SPI Class for CircuitPython Compatibility. Used
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for both MicroPython and Linux.
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"""
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def __init__(self, clock, MOSI=None, MISO=None):
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self.deinit()
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if detector.board.ftdi_ft232h:
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from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.spi import SPI as _SPI
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from adafruit_blinka.microcontroller.ftdi_mpsse.ft232h.pin import (
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SCK,
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MOSI,
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MISO,
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)
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self._spi = _SPI()
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self._pins = (SCK, MOSI, MISO)
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return
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if detector.board.binho_nova:
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from adafruit_blinka.microcontroller.nova.spi import SPI as _SPI
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from adafruit_blinka.microcontroller.nova.pin import SCK, MOSI, MISO
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self._spi = _SPI(clock)
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self._pins = (SCK, MOSI, MISO)
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return
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if detector.board.greatfet_one:
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from adafruit_blinka.microcontroller.nxp_lpc4330.spi import SPI as _SPI
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from adafruit_blinka.microcontroller.nxp_lpc4330.pin import SCK, MOSI, MISO
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self._spi = _SPI()
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self._pins = (SCK, MOSI, MISO)
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return
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if detector.board.pico_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import SPI_Pico as _SPI
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self._spi = _SPI(clock) # this is really all that's needed
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self._pins = (clock, clock, clock) # will determine MOSI/MISO from clock
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return
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if detector.board.feather_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
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SPI_Feather as _SPI,
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)
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self._spi = _SPI(clock) # this is really all that's needed
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self._pins = (clock, clock, clock) # will determine MOSI/MISO from clock
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return
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if detector.board.feather_can_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
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SPI_Feather_CAN as _SPI,
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)
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self._spi = _SPI(clock) # this is really all that's needed
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self._pins = (clock, clock, clock) # will determine MOSI/MISO from clock
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return
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if detector.board.feather_epd_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
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SPI_Feather_EPD as _SPI,
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)
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self._spi = _SPI(clock) # this is really all that's needed
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self._pins = (clock, clock, clock) # will determine MOSI/MISO from clock
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return
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if detector.board.feather_rfm_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
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SPI_Feather_RFM as _SPI,
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)
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self._spi = _SPI(clock) # this is really all that's needed
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self._pins = (clock, clock, clock) # will determine MOSI/MISO from clock
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return
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if detector.board.itsybitsy_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
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SPI_ItsyBitsy as _SPI,
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)
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self._spi = _SPI(clock) # this is really all that's needed
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self._pins = (clock, clock, clock) # will determine MOSI/MISO from clock
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return
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if detector.board.macropad_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
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SPI_MacroPad as _SPI,
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)
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self._spi = _SPI(clock) # this is really all that's needed
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self._pins = (clock, clock, clock) # will determine MOSI/MISO from clock
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return
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if detector.board.qtpy_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import SPI_QTPY as _SPI
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self._spi = _SPI(clock) # this is really all that's needed
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self._pins = (clock, clock, clock) # will determine MOSI/MISO from clock
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return
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if detector.board.kb2040_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
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SPI_KB2040 as _SPI,
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)
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self._spi = _SPI(clock) # this is really all that's needed
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self._pins = (clock, clock, clock) # will determine MOSI/MISO from clock
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return
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if detector.chip.id == ap_chip.RP2040:
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from adafruit_blinka.microcontroller.rp2040.spi import SPI as _SPI
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self._spi = _SPI(clock, MOSI, MISO) # Pins configured on instantiation
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self._pins = (clock, clock, clock) # These don't matter, they're discarded
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return
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if detector.board.any_siemens_iot2000:
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from adafruit_blinka.microcontroller.am65xx.spi import SPI as _SPI
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self._spi = _SPI(clock) # this is really all that's needed
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self._pins = (clock, clock, clock) # will determine MOSI/MISO from clock
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return
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if detector.board.any_embedded_linux:
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from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
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elif detector.board.ftdi_ft2232h:
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from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.spi import SPI as _SPI
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elif detector.board.ftdi_ft4232h:
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from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.spi import SPI as _SPI
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elif detector.board.OS_AGNOSTIC_BOARD:
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from adafruit_blinka.microcontroller.generic_agnostic_board.spi import (
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SPI as _SPI,
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)
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else:
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from adafruit_blinka.microcontroller.generic_micropython.spi import (
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SPI as _SPI,
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)
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from microcontroller.pin import spiPorts
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for portId, portSck, portMosi, portMiso in spiPorts:
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if (
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(clock == portSck)
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and MOSI in (portMosi, None) # Clock is required!
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and MISO in (portMiso, None) # But can do with just output
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): # Or just input
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self._spi = _SPI(portId)
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self._pins = (portSck, portMosi, portMiso)
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break
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else:
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raise ValueError(
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"No Hardware SPI on (SCLK, MOSI, MISO)={}\nValid SPI ports:{}".format(
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(clock, MOSI, MISO), spiPorts
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)
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)
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def configure(self, baudrate=100000, polarity=0, phase=0, bits=8):
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"""Update the configuration"""
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if detector.board.any_nanopi and detector.chip.id == ap_chip.SUN8I:
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from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
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elif detector.board.ftdi_ft232h:
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from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.spi import (
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SPI as _SPI,
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)
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elif detector.board.ftdi_ft2232h:
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from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.spi import (
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SPI as _SPI,
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)
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elif detector.board.ftdi_ft4232h:
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from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.spi import (
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SPI as _SPI,
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)
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elif detector.board.binho_nova:
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from adafruit_blinka.microcontroller.nova.spi import SPI as _SPI
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elif detector.board.greatfet_one:
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from adafruit_blinka.microcontroller.nxp_lpc4330.spi import SPI as _SPI
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elif detector.board.any_lubancat and detector.chip.id == ap_chip.IMX6ULL:
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from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
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elif detector.board.pico_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import SPI_Pico as _SPI
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elif detector.board.feather_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
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SPI_Feather as _SPI,
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)
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elif detector.board.feather_can_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
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SPI_Feather_CAN as _SPI,
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)
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elif detector.board.feather_epd_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
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SPI_Feather_EPD as _SPI,
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)
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elif detector.board.feather_rfm_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
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SPI_Feather_RFM as _SPI,
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)
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elif detector.board.itsybitsy_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
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SPI_ItsyBitsy as _SPI,
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)
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elif detector.board.macropad_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
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SPI_MacroPad as _SPI,
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)
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elif detector.board.kb2040_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
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SPI_KB2040 as _SPI,
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)
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elif detector.board.qtpy_u2if:
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from adafruit_blinka.microcontroller.rp2040_u2if.spi import SPI_QTPY as _SPI
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elif detector.chip.id == ap_chip.RP2040:
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from adafruit_blinka.microcontroller.rp2040.spi import SPI as _SPI
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elif detector.board.any_siemens_iot2000:
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from adafruit_blinka.microcontroller.am65xx.spi import SPI as _SPI
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from adafruit_blinka.microcontroller.am65xx.pin import Pin
|
|
elif detector.board.any_embedded_linux:
|
|
from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
|
|
elif detector.board.OS_AGNOSTIC_BOARD:
|
|
from adafruit_blinka.microcontroller.generic_agnostic_board.spi import (
|
|
SPI as _SPI,
|
|
)
|
|
else:
|
|
from adafruit_blinka.microcontroller.generic_micropython.spi import (
|
|
SPI as _SPI,
|
|
)
|
|
|
|
if self._locked:
|
|
# TODO check if #init ignores MOSI=None rather than unsetting, to save _pinIds attribute
|
|
self._spi.init(
|
|
baudrate=baudrate,
|
|
polarity=polarity,
|
|
phase=phase,
|
|
bits=bits,
|
|
firstbit=_SPI.MSB,
|
|
)
|
|
else:
|
|
raise RuntimeError("First call try_lock()")
|
|
|
|
def deinit(self):
|
|
"""Deinitialization"""
|
|
self._spi = None
|
|
self._pinIds = None
|
|
|
|
@property
|
|
def frequency(self):
|
|
"""Return the baud rate if implemented"""
|
|
try:
|
|
return self._spi.frequency
|
|
except AttributeError as error:
|
|
raise NotImplementedError(
|
|
"Frequency attribute not implemented for this platform"
|
|
) from error
|
|
|
|
def write(self, buf, start=0, end=None):
|
|
"""Write to the SPI device"""
|
|
return self._spi.write(buf, start, end)
|
|
|
|
def readinto(self, buf, start=0, end=None, write_value=0):
|
|
"""Read from the SPI device into a buffer"""
|
|
return self._spi.readinto(buf, start, end, write_value=write_value)
|
|
|
|
def write_readinto(
|
|
self, 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"""
|
|
return self._spi.write_readinto(
|
|
buffer_out, buffer_in, out_start, out_end, in_start, in_end
|
|
)
|
|
|
|
|
|
class UART(Lockable):
|
|
"""
|
|
Busio UART Class for CircuitPython Compatibility. Used
|
|
for MicroPython and a few other non-Linux boards.
|
|
"""
|
|
|
|
class Parity(Enum):
|
|
"""Parity Enumeration"""
|
|
|
|
pass # pylint: disable=unnecessary-pass
|
|
|
|
Parity.ODD = Parity()
|
|
Parity.EVEN = Parity()
|
|
|
|
def __init__(
|
|
self,
|
|
tx,
|
|
rx,
|
|
baudrate=9600,
|
|
bits=8,
|
|
parity=None,
|
|
stop=1,
|
|
timeout=1000,
|
|
receiver_buffer_size=64,
|
|
flow=None,
|
|
):
|
|
if detector.board.any_embedded_linux:
|
|
raise RuntimeError(
|
|
"busio.UART not supported on this platform. Please use pyserial instead."
|
|
)
|
|
if detector.board.binho_nova:
|
|
from adafruit_blinka.microcontroller.nova.uart import UART as _UART
|
|
elif detector.board.greatfet_one:
|
|
from adafruit_blinka.microcontroller.nxp_lpc4330.uart import UART as _UART
|
|
elif detector.chip.id == ap_chip.RP2040:
|
|
from adafruit_blinka.microcontroller.rp2040.uart import UART as _UART
|
|
else:
|
|
from machine import UART as _UART
|
|
|
|
from microcontroller.pin import uartPorts
|
|
|
|
self.baudrate = baudrate
|
|
|
|
if flow is not None: # default 0
|
|
raise NotImplementedError(
|
|
"Parameter '{}' unsupported on {}".format("flow", agnostic.board_id)
|
|
)
|
|
|
|
# translate parity flag for Micropython
|
|
if parity is UART.Parity.ODD:
|
|
parity = 1
|
|
elif parity is UART.Parity.EVEN:
|
|
parity = 0
|
|
elif parity is None:
|
|
pass
|
|
else:
|
|
raise ValueError("Invalid parity")
|
|
|
|
if detector.chip.id == ap_chip.RP2040:
|
|
self._uart = _UART(
|
|
tx,
|
|
rx,
|
|
baudrate=baudrate,
|
|
bits=bits,
|
|
parity=parity,
|
|
stop=stop,
|
|
)
|
|
else:
|
|
# check tx and rx have hardware support
|
|
for portId, portTx, portRx in uartPorts: #
|
|
if portTx == tx and portRx == rx:
|
|
self._uart = _UART(
|
|
portId,
|
|
baudrate,
|
|
bits=bits,
|
|
parity=parity,
|
|
stop=stop,
|
|
timeout=timeout,
|
|
read_buf_len=receiver_buffer_size,
|
|
)
|
|
break
|
|
else:
|
|
raise ValueError(
|
|
"No Hardware UART on (tx,rx)={}\nValid UART ports: {}".format(
|
|
(tx, rx), uartPorts
|
|
)
|
|
)
|
|
|
|
def deinit(self):
|
|
"""Deinitialization"""
|
|
if detector.board.binho_nova:
|
|
self._uart.deinit()
|
|
self._uart = None
|
|
|
|
def read(self, nbytes=None):
|
|
"""Read from the UART"""
|
|
return self._uart.read(nbytes)
|
|
|
|
def readinto(self, buf, nbytes=None):
|
|
"""Read from the UART into a buffer"""
|
|
return self._uart.readinto(buf, nbytes)
|
|
|
|
def readline(self):
|
|
"""Read a line of characters up to a newline character from the UART"""
|
|
return self._uart.readline()
|
|
|
|
def write(self, buf):
|
|
"""Write to the UART from a buffer"""
|
|
return self._uart.write(buf)
|