circuitpython/shared-bindings/analogbufio/BufferedIn.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* SPDX-FileCopyrightText: Copyright (c) 2022 Lee Atkinson, MeanStride Technology, Inc.
*
* TODO: Based on analogio/AnalogIn.c from Scott Shaw
*
* 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.
*/
#include <string.h>
#include "shared/runtime/context_manager_helpers.h"
#include "py/binary.h"
#include "py/mphal.h"
#include "py/nlr.h"
#include "py/runtime.h"
#include "shared-bindings/microcontroller/Pin.h"
#include "shared-bindings/analogbufio/BufferedIn.h"
#include "shared-bindings/util.h"
//| class BufferedIn:
//| """Capture multiple analog voltage levels to the supplied buffer
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//|
//| Usage::
//|
//| import board
//| import analogbufio
//| import array
//|
//| length = 1000
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//| mybuffer = array.array("H", [0x0000] * length)
//| rate = 500000
//| adcbuf = analogbufio.BufferedIn(board.GP26, sample_rate=rate)
//| adcbuf.readinto(mybuffer)
//| adcbuf.deinit()
//| for i in range(length):
//| print(i, mybuffer[i])
//|
//| (TODO) The reference voltage varies by platform so use
//| ``reference_voltage`` to read the configured setting.
//| (TODO) Provide mechanism to read CPU Temperature."""
//|
//| def __init__(self, pin: microcontroller.Pin, *, sample_rate: int) -> None:
//| """Create a `BufferedIn` on the given pin and given sample rate.
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//|
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//| :param ~microcontroller.Pin pin: the pin to read from
//| :param ~int sample_rate: rate: sampling frequency, in samples per second"""
//| ...
STATIC mp_obj_t analogbufio_bufferedin_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
enum { ARG_pin, ARG_sample_rate };
static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_pin, MP_ARG_OBJ | MP_ARG_REQUIRED },
{ MP_QSTR_sample_rate, MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_INT },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
// Validate Pin
const mcu_pin_obj_t *pin = validate_obj_is_free_pin(args[ARG_pin].u_obj, MP_QSTR_pin);
// Create local object
analogbufio_bufferedin_obj_t *self = m_new_obj_with_finaliser(analogbufio_bufferedin_obj_t);
self->base.type = &analogbufio_bufferedin_type;
// Call local interface in ports/common-hal/analogbufio
common_hal_analogbufio_bufferedin_construct(self, pin, args[ARG_sample_rate].u_int);
return MP_OBJ_FROM_PTR(self);
}
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//| def deinit(self) -> None:
//| """Shut down the `BufferedIn` and release the pin for other use."""
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//| ...
STATIC mp_obj_t analogbufio_bufferedin_deinit(mp_obj_t self_in) {
analogbufio_bufferedin_obj_t *self = MP_OBJ_TO_PTR(self_in);
common_hal_analogbufio_bufferedin_deinit(self);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(analogbufio_bufferedin_deinit_obj, analogbufio_bufferedin_deinit);
STATIC void check_for_deinit(analogbufio_bufferedin_obj_t *self) {
if (common_hal_analogbufio_bufferedin_deinited(self)) {
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raise_deinited_error();
}
}
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//| def __enter__(self) -> BufferedIn:
//| """No-op used by Context Managers."""
//| ...
// Provided by context manager helper.
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//| def __exit__(self) -> None:
//| """Automatically deinitializes the hardware when exiting a context. See
//| :ref:`lifetime-and-contextmanagers` for more info."""
//| ...
STATIC mp_obj_t analogbufio_bufferedin___exit__(size_t n_args, const mp_obj_t *args) {
(void)n_args;
common_hal_analogbufio_bufferedin_deinit(args[0]);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(analogbufio_bufferedin___exit___obj, 4, 4, analogbufio_bufferedin___exit__);
//| def readinto(self, buffer: WriteableBuffer) -> int:
//| """Fills the provided buffer with ADC voltage values.
//|
//| ADC values will be read into the given buffer at the supplied sample_rate.
//| Depending on the buffer typecode, 'B', 'H', samples are 8-bit byte-arrays or
//| 16-bit half-words and are always unsigned.
//| The ADC most significant bits of the ADC are kept. (See
//| https://docs.circuitpython.org/en/latest/docs/library/array.html)
//|
//| :param ~circuitpython_typing.WriteableBuffer buffer: buffer: A buffer for samples"""
//| ...
//|
STATIC mp_obj_t analogbufio_bufferedin_obj_readinto(mp_obj_t self_in, mp_obj_t buffer_obj) {
analogbufio_bufferedin_obj_t *self = MP_OBJ_TO_PTR(self_in);
check_for_deinit(self);
// Buffer defined and allocated by user
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(buffer_obj, &bufinfo, MP_BUFFER_READ);
uint8_t bytes_per_sample = 1;
// Bytes Per Sample
if (bufinfo.typecode == 'H') {
bytes_per_sample = 2;
} else if (bufinfo.typecode != 'B' && bufinfo.typecode != BYTEARRAY_TYPECODE) {
mp_raise_ValueError_varg(MP_ERROR_TEXT("%q must be a bytearray or array of type 'H' or 'B'"), MP_QSTR_buffer);
}
mp_uint_t captured = common_hal_analogbufio_bufferedin_readinto(self, bufinfo.buf, bufinfo.len, bytes_per_sample);
return MP_OBJ_NEW_SMALL_INT(captured);
}
MP_DEFINE_CONST_FUN_OBJ_2(analogbufio_bufferedin_readinto_obj, analogbufio_bufferedin_obj_readinto);
STATIC const mp_rom_map_elem_t analogbufio_bufferedin_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&analogbufio_bufferedin_deinit_obj) },
{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&analogbufio_bufferedin_deinit_obj) },
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{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&analogbufio_bufferedin___exit___obj) },
{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&analogbufio_bufferedin_readinto_obj)},
};
STATIC MP_DEFINE_CONST_DICT(analogbufio_bufferedin_locals_dict, analogbufio_bufferedin_locals_dict_table);
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MP_DEFINE_CONST_OBJ_TYPE(
analogbufio_bufferedin_type,
MP_QSTR_BufferedIn,
MP_TYPE_FLAG_NONE,
make_new, analogbufio_bufferedin_make_new,
locals_dict, &analogbufio_bufferedin_locals_dict
);