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circuitpython/shared-bindings/adafruit_bus_device/I2CDevice.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020 Mark Komus
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
// This file contains all of the Python API definitions for the
// busio.I2C class.
#include "shared-bindings/microcontroller/Pin.h"
#include "shared-bindings/adafruit_bus_device/I2CDevice.h"
#include "shared-bindings/util.h"
#include "shared-module/adafruit_bus_device/I2CDevice.h"
#include "lib/utils/buffer_helper.h"
#include "lib/utils/context_manager_helpers.h"
#include "py/runtime.h"
#include "py/smallint.h"
#include "supervisor/shared/translate.h"
//| class I2CDevice:
//| """I2C Device Manager"""
//|
//| def __init__(self, i2c: busio.I2C, device_address: int, probe: bool = True) -> None:
//|
//| """Represents a single I2C device and manages locking the bus and the device
//| address.
//| :param ~busio.I2C i2c: The I2C bus the device is on
//| :param int device_address: The 7 bit device address
//| :param bool probe: Probe for the device upon object creation, default is true
//|
//| Example::
//|
//| import busio
//| from board import *
//| from adafruit_bus_device.i2c_device import I2CDevice
//| with busio.I2C(SCL, SDA) as i2c:
//| device = I2CDevice(i2c, 0x70)
//| bytes_read = bytearray(4)
//| with device:
//| device.readinto(bytes_read)
//| # A second transaction
//| with device:
//| device.write(bytes_read)"""
//| ...
//|
STATIC mp_obj_t adafruit_bus_device_i2cdevice_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
adafruit_bus_device_i2cdevice_obj_t *self = m_new_obj(adafruit_bus_device_i2cdevice_obj_t);
self->base.type = &adafruit_bus_device_i2cdevice_type;
enum { ARG_i2c, ARG_device_address, ARG_probe };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_i2c, MP_ARG_REQUIRED | MP_ARG_OBJ },
{ MP_QSTR_device_address, MP_ARG_REQUIRED | MP_ARG_INT },
{ MP_QSTR_probe, MP_ARG_BOOL, {.u_bool = true} },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
mp_obj_t *i2c = args[ARG_i2c].u_obj;
common_hal_adafruit_bus_device_i2cdevice_construct(MP_OBJ_TO_PTR(self), i2c, args[ARG_device_address].u_int);
if (args[ARG_probe].u_bool == true) {
common_hal_adafruit_bus_device_i2cdevice_probe_for_device(self);
}
return (mp_obj_t)self;
}
//| def __enter__(self) -> I2CDevice:
//| """Context manager entry to lock bus."""
//| ...
//|
STATIC mp_obj_t adafruit_bus_device_i2cdevice_obj___enter__(mp_obj_t self_in) {
adafruit_bus_device_i2cdevice_obj_t *self = MP_OBJ_TO_PTR(self_in);
common_hal_adafruit_bus_device_i2cdevice_lock(self);
return self;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(adafruit_bus_device_i2cdevice___enter___obj, adafruit_bus_device_i2cdevice_obj___enter__);
//| def __exit__(self) -> None:
//| """Automatically unlocks the bus on exit."""
//| ...
//|
STATIC mp_obj_t adafruit_bus_device_i2cdevice_obj___exit__(size_t n_args, const mp_obj_t *args) {
common_hal_adafruit_bus_device_i2cdevice_unlock(MP_OBJ_TO_PTR(args[0]));
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(adafruit_bus_device_i2cdevice___exit___obj, 4, 4, adafruit_bus_device_i2cdevice_obj___exit__);
//| def readinto(self, buf: WriteableBuffer, *, start: int = 0, end: Optional[int] = None) -> None:
//| """Read into ``buf`` from the device. The number of bytes read will be the
//| length of ``buf``.
//| If ``start`` or ``end`` is provided, then the buffer will be sliced
//| as if ``buf[start:end]``. This will not cause an allocation like
//| ``buf[start:end]`` will so it saves memory.
//| :param bytearray buf: buffer to write into
//| :param int start: Index to start writing at
//| :param int end: Index to write up to but not include; if None, use ``len(buf)``"""
//| ...
//|
STATIC mp_obj_t adafruit_bus_device_i2cdevice_readinto(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_buffer, ARG_start, ARG_end };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_buffer, MP_ARG_REQUIRED | MP_ARG_OBJ },
{ MP_QSTR_start, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_end, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = INT_MAX} },
};
adafruit_bus_device_i2cdevice_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
mp_obj_t dest[8];
uint8_t num_kws = 1;
mp_load_method(self->i2c, MP_QSTR_readfrom_into, dest);
dest[2] = MP_OBJ_NEW_SMALL_INT(self->device_address);
dest[3] = args[ARG_buffer].u_obj;
// dest[4] = mp_obj_new_str("start", 5);
dest[4] = MP_OBJ_NEW_QSTR(MP_QSTR_start);
dest[5] = MP_OBJ_NEW_SMALL_INT(args[ARG_start].u_int);
if (args[ARG_end].u_int != INT_MAX) {
dest[6] = MP_OBJ_NEW_QSTR(MP_QSTR_end);
dest[7] = MP_OBJ_NEW_SMALL_INT(args[ARG_end].u_int);
num_kws++;
}
mp_call_method_n_kw(2, num_kws, dest);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(adafruit_bus_device_i2cdevice_readinto_obj, 2, adafruit_bus_device_i2cdevice_readinto);
//| def write(self, buf: ReadableBuffer, *, start: int = 0, end: Optional[int] = None) -> None:
//| """Write the bytes from ``buffer`` to the device, then transmit a stop bit.
//| If ``start`` or ``end`` is provided, then the buffer will be sliced
//| as if ``buffer[start:end]``. This will not cause an allocation like
//| ``buffer[start:end]`` will so it saves memory.
//| :param bytearray buf: buffer containing the bytes to write
//| :param int start: Index to start writing from
//| :param int end: Index to read up to but not include; if None, use ``len(buf)``
//| """
//| ...
//|
STATIC mp_obj_t adafruit_bus_device_i2cdevice_write(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_buffer, ARG_start, ARG_end };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_buffer, MP_ARG_REQUIRED | MP_ARG_OBJ },
{ MP_QSTR_start, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_end, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = INT_MAX} },
};
adafruit_bus_device_i2cdevice_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
mp_obj_t dest[8];
uint8_t num_kws = 1;
mp_load_method(self->i2c, MP_QSTR_writeto, dest);
dest[2] = MP_OBJ_NEW_SMALL_INT(self->device_address);
dest[3] = args[ARG_buffer].u_obj;
dest[4] = MP_OBJ_NEW_QSTR(MP_QSTR_start);
dest[5] = MP_OBJ_NEW_SMALL_INT(args[ARG_start].u_int);
if (args[ARG_end].u_int != INT_MAX) {
dest[6] = MP_OBJ_NEW_QSTR(MP_QSTR_end);
dest[7] = MP_OBJ_NEW_SMALL_INT(args[ARG_end].u_int);
num_kws++;
}
mp_call_method_n_kw(2, num_kws, dest);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(adafruit_bus_device_i2cdevice_write_obj, 2, adafruit_bus_device_i2cdevice_write);
//| def write_then_readinto(self, out_buffer: WriteableBuffer, in_buffer: ReadableBuffer, *, out_start: int = 0, out_end: Optional[int] = None, in_start: int = 0, in_end: Optional[int] = None) -> None:
//| """Write the bytes from ``out_buffer`` to the device, then immediately
//| reads into ``in_buffer`` from the device. The number of bytes read
//| will be the length of ``in_buffer``.
//| If ``out_start`` or ``out_end`` is provided, then the output buffer
//| will be sliced as if ``out_buffer[out_start:out_end]``. This will
//| not cause an allocation like ``buffer[out_start:out_end]`` will so
//| it saves memory.
//| If ``in_start`` or ``in_end`` is provided, then the input buffer
//| will be sliced as if ``in_buffer[in_start:in_end]``. This will not
//| cause an allocation like ``in_buffer[in_start:in_end]`` will so
//| it saves memory.
//| :param bytearray out_buffer: buffer containing the bytes to write
//| :param bytearray in_buffer: buffer containing the bytes to read into
//| :param int out_start: Index to start writing from
//| :param int out_end: Index to read up to but not include; if None, use ``len(out_buffer)``
//| :param int in_start: Index to start writing at
//| :param int in_end: Index to write up to but not include; if None, use ``len(in_buffer)``
//| """
//| ...
//|
STATIC mp_obj_t adafruit_bus_device_i2cdevice_write_then_readinto(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_out_buffer, ARG_in_buffer, ARG_out_start, ARG_out_end, ARG_in_start, ARG_in_end };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_out_buffer, MP_ARG_REQUIRED | MP_ARG_OBJ },
{ MP_QSTR_in_buffer, MP_ARG_REQUIRED | MP_ARG_OBJ },
{ MP_QSTR_out_start, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_out_end, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = INT_MAX} },
{ MP_QSTR_in_start, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_in_end, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = INT_MAX} },
};
adafruit_bus_device_i2cdevice_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
mp_obj_t dest[13];
uint8_t num_kws = 2;
uint8_t index = 2;
mp_load_method(self->i2c, MP_QSTR_writeto_then_readfrom, dest);
dest[index++] = MP_OBJ_NEW_SMALL_INT(self->device_address);
dest[index++] = args[ARG_out_buffer].u_obj;
dest[index++] = args[ARG_in_buffer].u_obj;
dest[index++] = MP_OBJ_NEW_QSTR(MP_QSTR_out_start);
dest[index++] = MP_OBJ_NEW_SMALL_INT(args[ARG_out_start].u_int);
if (args[ARG_out_end].u_int != INT_MAX) {
dest[index++] = MP_OBJ_NEW_QSTR(MP_QSTR_out_end);
dest[index++] = MP_OBJ_NEW_SMALL_INT(args[ARG_out_end].u_int);
num_kws++;
}
dest[index++] = MP_OBJ_NEW_QSTR(MP_QSTR_in_start);
dest[index++] = MP_OBJ_NEW_SMALL_INT(args[ARG_in_start].u_int);
if (args[ARG_in_end].u_int != INT_MAX) {
dest[index++] = MP_OBJ_NEW_QSTR(MP_QSTR_in_end);
dest[index++] = MP_OBJ_NEW_SMALL_INT(args[ARG_in_end].u_int);
num_kws++;
}
mp_call_method_n_kw(3, num_kws, dest);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(adafruit_bus_device_i2cdevice_write_then_readinto_obj, 3, adafruit_bus_device_i2cdevice_write_then_readinto);
STATIC const mp_rom_map_elem_t adafruit_bus_device_i2cdevice_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&adafruit_bus_device_i2cdevice___enter___obj) },
{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&adafruit_bus_device_i2cdevice___exit___obj) },
{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&adafruit_bus_device_i2cdevice_readinto_obj) },
{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&adafruit_bus_device_i2cdevice_write_obj) },
{ MP_ROM_QSTR(MP_QSTR_write_then_readinto), MP_ROM_PTR(&adafruit_bus_device_i2cdevice_write_then_readinto_obj) },
};
STATIC MP_DEFINE_CONST_DICT(adafruit_bus_device_i2cdevice_locals_dict, adafruit_bus_device_i2cdevice_locals_dict_table);
const mp_obj_type_t adafruit_bus_device_i2cdevice_type = {
{ &mp_type_type },
.name = MP_QSTR_I2CDevice,
.make_new = adafruit_bus_device_i2cdevice_make_new,
.locals_dict = (mp_obj_dict_t *)&adafruit_bus_device_i2cdevice_locals_dict,
};
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