264 lines
12 KiB
C
264 lines
12 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2020 Mark Komus
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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// This file contains all of the Python API definitions for the
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// busio.I2C class.
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#include "shared-bindings/microcontroller/Pin.h"
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#include "shared-bindings/busdevice/I2CDevice.h"
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#include "shared-bindings/util.h"
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#include "shared-module/busdevice/I2CDevice.h"
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#include "lib/utils/buffer_helper.h"
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#include "lib/utils/context_manager_helpers.h"
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#include "py/runtime.h"
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#include "supervisor/shared/translate.h"
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//| class I2CDevice:
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//| """I2C Device Manager"""
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//|
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//| def __init__(self, scl: microcontroller.Pin, sda: microcontroller.Pin, *, frequency: int = 100000, timeout: int = 255) -> None:
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//|
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//| """Represents a single I2C device and manages locking the bus and the device
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//| address.
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//| :param ~busio.I2C i2c: The I2C bus the device is on
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//| :param int device_address: The 7 bit device address
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//| :param bool probe: Probe for the device upon object creation, default is true
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//| .. note:: This class is **NOT** built into CircuitPython. See
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//| :ref:`here for install instructions <bus_device_installation>`.
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//| Example:
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//| .. code-block:: python
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//| import busio
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//| from board import *
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//| from adafruit_bus_device.i2c_device import I2CDevice
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//| with busio.I2C(SCL, SDA) as i2c:
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//| device = I2CDevice(i2c, 0x70)
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//| bytes_read = bytearray(4)
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//| with device:
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//| device.readinto(bytes_read)
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//| # A second transaction
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//| with device:
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//| device.write(bytes_read)"""
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//| ...
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//|
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STATIC mp_obj_t busdevice_i2cdevice_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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busdevice_i2cdevice_obj_t *self = m_new_obj(busdevice_i2cdevice_obj_t);
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self->base.type = &busdevice_i2cdevice_type;
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enum { ARG_i2c, ARG_device_address, ARG_probe };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_i2c, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_device_address, MP_ARG_REQUIRED | MP_ARG_INT },
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{ MP_QSTR_probe, MP_ARG_BOOL, {.u_bool = true} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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busio_i2c_obj_t* i2c = args[ARG_i2c].u_obj;
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common_hal_busdevice_i2cdevice_construct(MP_OBJ_TO_PTR(self), i2c, args[ARG_device_address].u_int);
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if (args[ARG_probe].u_bool == true) {
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common_hal_busdevice_i2cdevice_probe_for_device(self);
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}
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return (mp_obj_t)self;
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}
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//| def __enter__(self) -> I2C:
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//| """Context manager entry to lock bus."""
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//| ...
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//|
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STATIC mp_obj_t busdevice_i2cdevice_obj___enter__(mp_obj_t self_in) {
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busdevice_i2cdevice_obj_t *self = MP_OBJ_TO_PTR(self_in);
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common_hal_busdevice_i2cdevice_lock(self);
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return self;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(busdevice_i2cdevice___enter___obj, busdevice_i2cdevice_obj___enter__);
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//| def __exit__(self) -> None:
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//| """Automatically unlocks the bus on exit."""
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//| ...
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//|
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STATIC mp_obj_t busdevice_i2cdevice_obj___exit__(size_t n_args, const mp_obj_t *args) {
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common_hal_busdevice_i2cdevice_unlock(MP_OBJ_TO_PTR(args[0]));
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(busdevice_i2cdevice___exit___obj, 4, 4, busdevice_i2cdevice_obj___exit__);
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//| def readinto(self, buf, *, start=0, end=None) -> None:
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//| """
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//| Read into ``buf`` from the device. The number of bytes read will be the
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//| length of ``buf``.
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//| If ``start`` or ``end`` is provided, then the buffer will be sliced
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//| as if ``buf[start:end]``. This will not cause an allocation like
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//| ``buf[start:end]`` will so it saves memory.
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//| :param bytearray buffer: buffer to write into
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//| :param int start: Index to start writing at
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//| :param int end: Index to write up to but not include; if None, use ``len(buf)``"""
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//| ...
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//|
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STATIC void readinto(busdevice_i2cdevice_obj_t *self, mp_obj_t buffer, int32_t start, mp_int_t end) {
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(buffer, &bufinfo, MP_BUFFER_WRITE);
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size_t length = bufinfo.len;
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normalize_buffer_bounds(&start, end, &length);
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if (length == 0) {
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mp_raise_ValueError(translate("Buffer must be at least length 1"));
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}
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uint8_t status = common_hal_busdevice_i2cdevice_readinto(MP_OBJ_TO_PTR(self), ((uint8_t*)bufinfo.buf) + start, length);
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if (status != 0) {
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mp_raise_OSError(status);
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}
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}
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STATIC mp_obj_t busdevice_i2cdevice_readinto(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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enum { ARG_buffer, ARG_start, ARG_end };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_buffer, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_start, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_end, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = INT_MAX} },
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};
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busdevice_i2cdevice_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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readinto(self, args[ARG_buffer].u_obj, args[ARG_start].u_int, args[ARG_end].u_int);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(busdevice_i2cdevice_readinto_obj, 2, busdevice_i2cdevice_readinto);
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//| def write(self, buf, *, start=0, end=None) -> None:
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//| """
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//| Write the bytes from ``buffer`` to the device, then transmit a stop bit.
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//| If ``start`` or ``end`` is provided, then the buffer will be sliced
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//| as if ``buffer[start:end]``. This will not cause an allocation like
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//| ``buffer[start:end]`` will so it saves memory.
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//| :param bytearray buffer: buffer containing the bytes to write
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//| :param int start: Index to start writing from
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//| :param int end: Index to read up to but not include; if None, use ``len(buf)``
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//| """
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//| ...
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//|
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STATIC void write(busdevice_i2cdevice_obj_t *self, mp_obj_t buffer, int32_t start, mp_int_t end) {
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(buffer, &bufinfo, MP_BUFFER_READ);
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size_t length = bufinfo.len;
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normalize_buffer_bounds(&start, end, &length);
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if (length == 0) {
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mp_raise_ValueError(translate("Buffer must be at least length 1"));
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}
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uint8_t status = common_hal_busdevice_i2cdevice_write(MP_OBJ_TO_PTR(self), ((uint8_t*)bufinfo.buf) + start, length);
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if (status != 0) {
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mp_raise_OSError(status);
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}
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}
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STATIC mp_obj_t busdevice_i2cdevice_write(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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enum { ARG_buffer, ARG_start, ARG_end };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_buffer, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_start, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_end, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = INT_MAX} },
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};
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busdevice_i2cdevice_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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write(self, args[ARG_buffer].u_obj, args[ARG_start].u_int, args[ARG_end].u_int);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(busdevice_i2cdevice_write_obj, 2, busdevice_i2cdevice_write);
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//| def write_then_readinto(self, out_buffer, in_buffer, *, out_start=0, out_end=None, in_start=0, in_end=None) -> None:
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//| """
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//| Write the bytes from ``out_buffer`` to the device, then immediately
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//| reads into ``in_buffer`` from the device. The number of bytes read
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//| will be the length of ``in_buffer``.
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//| If ``out_start`` or ``out_end`` is provided, then the output buffer
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//| will be sliced as if ``out_buffer[out_start:out_end]``. This will
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//| not cause an allocation like ``buffer[out_start:out_end]`` will so
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//| it saves memory.
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//| If ``in_start`` or ``in_end`` is provided, then the input buffer
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//| will be sliced as if ``in_buffer[in_start:in_end]``. This will not
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//| cause an allocation like ``in_buffer[in_start:in_end]`` will so
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//| it saves memory.
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//| :param bytearray out_buffer: buffer containing the bytes to write
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//| :param bytearray in_buffer: buffer containing the bytes to read into
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//| :param int out_start: Index to start writing from
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//| :param int out_end: Index to read up to but not include; if None, use ``len(out_buffer)``
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//| :param int in_start: Index to start writing at
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//| :param int in_end: Index to write up to but not include; if None, use ``len(in_buffer)``
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//| """
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//| ...
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//|
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STATIC mp_obj_t busdevice_i2cdevice_write_then_readinto(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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enum { ARG_out_buffer, ARG_in_buffer, ARG_out_start, ARG_out_end, ARG_in_start, ARG_in_end };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_out_buffer, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_in_buffer, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_out_start, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_out_end, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = INT_MAX} },
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{ MP_QSTR_in_start, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_in_end, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = INT_MAX} },
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};
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busdevice_i2cdevice_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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write(self, args[ARG_out_buffer].u_obj, args[ARG_out_start].u_int, args[ARG_out_end].u_int);
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readinto(self, args[ARG_in_buffer].u_obj, args[ARG_in_start].u_int, args[ARG_in_end].u_int);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(busdevice_i2cdevice_write_then_readinto_obj, 3, busdevice_i2cdevice_write_then_readinto);
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STATIC const mp_rom_map_elem_t busdevice_i2cdevice_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&busdevice_i2cdevice___enter___obj) },
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{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&busdevice_i2cdevice___exit___obj) },
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{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&busdevice_i2cdevice_readinto_obj) },
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{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&busdevice_i2cdevice_write_obj) },
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{ MP_ROM_QSTR(MP_QSTR_write_then_readinto), MP_ROM_PTR(&busdevice_i2cdevice_write_then_readinto_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(busdevice_i2cdevice_locals_dict, busdevice_i2cdevice_locals_dict_table);
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const mp_obj_type_t busdevice_i2cdevice_type = {
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{ &mp_type_type },
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.name = MP_QSTR_I2CDevice,
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.make_new = busdevice_i2cdevice_make_new,
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.locals_dict = (mp_obj_dict_t*)&busdevice_i2cdevice_locals_dict,
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};
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