circuitpython/shared-bindings/usb_cdc/Serial.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Dan Halbert for Adafruit Industries
*
* 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 <stdint.h>
#include "shared-bindings/usb_cdc/Serial.h"
#include "shared-bindings/util.h"
#include "py/ioctl.h"
#include "py/objproperty.h"
#include "py/runtime.h"
#include "py/stream.h"
#include "supervisor/shared/translate.h"
//| class Serial:
//| """Receives cdc commands over USB"""
//|
//| def __init__(self) -> None:
//| """You cannot create an instance of `usb_cdc.Serial`.
//|
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//| Serial objects are pre-constructed for each CDC device in the USB
//| descriptor and are included in the ``usb_cdc.serials`` tuple."""
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//| ...
//|
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//| def read(self, size: int = 1) -> bytes:
//| """Read at most ``size`` bytes. If ``size`` exceeds the internal buffer size
//| only the bytes in the buffer will be read. If `timeout` is > 0 or ``None``,
//| and fewer than ``size`` bytes are available, keep waiting until the timeout
//| expires or ``size`` bytes are available.
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//|
//| :return: Data read
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//| :rtype: bytes"""
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//| ...
//|
//| def readinto(self, buf: WriteableBuffer) -> int:
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//| """Read bytes into the ``buf``. If ``nbytes`` is specified then read at most
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//| that many bytes, subject to `timeout`. Otherwise, read at most ``len(buf)`` bytes.
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//|
//| :return: number of bytes read and stored into ``buf``
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//| :rtype: bytes"""
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//| ...
//|
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//| def write(self, buf: ReadableBuffer) -> int:
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//| """Write as many bytes as possible from the buffer of bytes.
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//|
//| :return: the number of bytes written
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//| :rtype: int"""
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//| ...
//|
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//| def flush(self) -> None:
//| """Force out any unwritten bytes, waiting until they are written."""
//| ...
//|
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// These three methods are used by the shared stream methods.
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STATIC mp_uint_t usb_cdc_serial_read_stream(mp_obj_t self_in, void *buf_in, mp_uint_t size, int *errcode) {
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usb_cdc_serial_obj_t *self = MP_OBJ_TO_PTR(self_in);
byte *buf = buf_in;
// make sure we want at least 1 char
if (size == 0) {
return 0;
}
return common_hal_usb_cdc_serial_read(self, buf, size, errcode);
}
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STATIC mp_uint_t usb_cdc_serial_write_stream(mp_obj_t self_in, const void *buf_in, mp_uint_t size, int *errcode) {
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usb_cdc_serial_obj_t *self = MP_OBJ_TO_PTR(self_in);
const byte *buf = buf_in;
return common_hal_usb_cdc_serial_write(self, buf, size, errcode);
}
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STATIC mp_uint_t usb_cdc_serial_ioctl_stream(mp_obj_t self_in, mp_uint_t request, mp_uint_t arg, int *errcode) {
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usb_cdc_serial_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_uint_t ret = 0;
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switch (request) {
case MP_IOCTL_POLL: {
mp_uint_t flags = arg;
ret = 0;
if ((flags & MP_IOCTL_POLL_RD) && common_hal_usb_cdc_serial_get_in_waiting(self) > 0) {
ret |= MP_IOCTL_POLL_RD;
}
if ((flags & MP_IOCTL_POLL_WR) && common_hal_usb_cdc_serial_get_out_waiting(self) == 0) {
ret |= MP_IOCTL_POLL_WR;
}
break;
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}
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case MP_STREAM_FLUSH:
common_hal_usb_cdc_serial_flush(self);
break;
default:
*errcode = MP_EINVAL;
ret = MP_STREAM_ERROR;
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}
return ret;
}
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//| connected: bool
//| """True if this Serial is connected to a host. (read-only)
//|
//| .. note:: The host is considered to be connected if it is asserting DTR (Data Terminal Ready).
//| Most terminal programs and ``pyserial`` assert DTR when opening a serial connection.
//| However, the C# ``SerialPort`` API does not. You must set ``SerialPort.DtrEnable``.
//| """
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//|
STATIC mp_obj_t usb_cdc_serial_get_connected(mp_obj_t self_in) {
usb_cdc_serial_obj_t *self = MP_OBJ_TO_PTR(self_in);
return mp_obj_new_bool(common_hal_usb_cdc_serial_get_connected(self));
}
MP_DEFINE_CONST_FUN_OBJ_1(usb_cdc_serial_get_connected_obj, usb_cdc_serial_get_connected);
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const mp_obj_property_t usb_cdc_serial_connected_obj = {
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.base.type = &mp_type_property,
.proxy = {(mp_obj_t)&usb_cdc_serial_get_connected_obj,
(mp_obj_t)&mp_const_none_obj,
(mp_obj_t)&mp_const_none_obj},
};
//| in_waiting: int
//| """Returns the number of bytes waiting to be read on the USB serial input. (read-only)"""
//|
STATIC mp_obj_t usb_cdc_serial_get_in_waiting(mp_obj_t self_in) {
usb_cdc_serial_obj_t *self = MP_OBJ_TO_PTR(self_in);
return mp_obj_new_int(common_hal_usb_cdc_serial_get_in_waiting(self));
}
MP_DEFINE_CONST_FUN_OBJ_1(usb_cdc_serial_get_in_waiting_obj, usb_cdc_serial_get_in_waiting);
const mp_obj_property_t usb_cdc_serial_in_waiting_obj = {
.base.type = &mp_type_property,
.proxy = {(mp_obj_t)&usb_cdc_serial_get_in_waiting_obj,
(mp_obj_t)&mp_const_none_obj,
(mp_obj_t)&mp_const_none_obj},
};
//| out_waiting: int
//| """Returns the number of bytes waiting to be written on the USB serial output. (read-only)"""
//|
STATIC mp_obj_t usb_cdc_serial_get_out_waiting(mp_obj_t self_in) {
usb_cdc_serial_obj_t *self = MP_OBJ_TO_PTR(self_in);
return mp_obj_new_int(common_hal_usb_cdc_serial_get_out_waiting(self));
}
MP_DEFINE_CONST_FUN_OBJ_1(usb_cdc_serial_get_out_waiting_obj, usb_cdc_serial_get_out_waiting);
const mp_obj_property_t usb_cdc_serial_out_waiting_obj = {
.base.type = &mp_type_property,
.proxy = {(mp_obj_t)&usb_cdc_serial_get_out_waiting_obj,
(mp_obj_t)&mp_const_none_obj,
(mp_obj_t)&mp_const_none_obj},
};
//| def reset_input_buffer(self) -> None:
//| """Clears any unread bytes."""
//| ...
//|
STATIC mp_obj_t usb_cdc_serial_reset_input_buffer(mp_obj_t self_in) {
usb_cdc_serial_obj_t *self = MP_OBJ_TO_PTR(self_in);
common_hal_usb_cdc_serial_reset_input_buffer(self);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(usb_cdc_serial_reset_input_buffer_obj, usb_cdc_serial_reset_input_buffer);
//| def reset_output_buffer(self) -> None:
//| """Clears any unwritten bytes."""
//| ...
//|
STATIC mp_obj_t usb_cdc_serial_reset_output_buffer(mp_obj_t self_in) {
usb_cdc_serial_obj_t *self = MP_OBJ_TO_PTR(self_in);
common_hal_usb_cdc_serial_reset_output_buffer(self);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(usb_cdc_serial_reset_output_buffer_obj, usb_cdc_serial_reset_output_buffer);
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//| timeout: Optional[float]
//| """The initial value of `timeout` is ``None``. If ``None``, wait indefinitely to satisfy
//| the conditions of a read operation. If 0, do not wait. If > 0, wait only ``timeout`` seconds."""
//|
STATIC mp_obj_t usb_cdc_serial_get_timeout(mp_obj_t self_in) {
usb_cdc_serial_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_float_t timeout = common_hal_usb_cdc_serial_get_timeout(self);
return (timeout < 0.0f) ? mp_const_none : mp_obj_new_float(self->timeout);
}
MP_DEFINE_CONST_FUN_OBJ_1(usb_cdc_serial_get_timeout_obj, usb_cdc_serial_get_timeout);
STATIC mp_obj_t usb_cdc_serial_set_timeout(mp_obj_t self_in, mp_obj_t timeout_in) {
usb_cdc_serial_obj_t *self = MP_OBJ_TO_PTR(self_in);
common_hal_usb_cdc_serial_set_timeout(self,
timeout_in == mp_const_none ? -1.0f : mp_obj_get_float(timeout_in));
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_2(usb_cdc_serial_set_timeout_obj, usb_cdc_serial_set_timeout);
const mp_obj_property_t usb_cdc_serial_timeout_obj = {
.base.type = &mp_type_property,
.proxy = {(mp_obj_t)&usb_cdc_serial_get_timeout_obj,
(mp_obj_t)&usb_cdc_serial_set_timeout_obj,
(mp_obj_t)&mp_const_none_obj},
};
//| write_timeout: Optional[float]
//| """The initial value of `write_timeout` is ``None``. If ``None``, wait indefinitely to finish
//| writing all the bytes passed to ``write()``.If 0, do not wait.
//| If > 0, wait only ``write_timeout`` seconds."""
//|
STATIC mp_obj_t usb_cdc_serial_get_write_timeout(mp_obj_t self_in) {
usb_cdc_serial_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_float_t write_timeout = common_hal_usb_cdc_serial_get_write_timeout(self);
return (write_timeout < 0.0f) ? mp_const_none : mp_obj_new_float(self->write_timeout);
}
MP_DEFINE_CONST_FUN_OBJ_1(usb_cdc_serial_get_write_timeout_obj, usb_cdc_serial_get_write_timeout);
STATIC mp_obj_t usb_cdc_serial_set_write_timeout(mp_obj_t self_in, mp_obj_t write_timeout_in) {
usb_cdc_serial_obj_t *self = MP_OBJ_TO_PTR(self_in);
common_hal_usb_cdc_serial_set_write_timeout(self,
write_timeout_in == mp_const_none ? -1.0f : mp_obj_get_float(write_timeout_in));
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_2(usb_cdc_serial_set_write_timeout_obj, usb_cdc_serial_set_write_timeout);
const mp_obj_property_t usb_cdc_serial_write_timeout_obj = {
.base.type = &mp_type_property,
.proxy = {(mp_obj_t)&usb_cdc_serial_get_write_timeout_obj,
(mp_obj_t)&usb_cdc_serial_set_write_timeout_obj,
(mp_obj_t)&mp_const_none_obj},
};
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STATIC const mp_rom_map_elem_t usb_cdc_serial_locals_dict_table[] = {
// Standard stream methods.
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{ MP_ROM_QSTR(MP_QSTR_flush), MP_ROM_PTR(&mp_stream_flush_obj) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj)},
{ MP_ROM_QSTR(MP_QSTR_readlines), MP_ROM_PTR(&mp_stream_unbuffered_readlines_obj)},
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{ MP_OBJ_NEW_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
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// Other pyserial-inspired attributes.
{ MP_OBJ_NEW_QSTR(MP_QSTR_in_waiting), MP_ROM_PTR(&usb_cdc_serial_in_waiting_obj) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_out_waiting), MP_ROM_PTR(&usb_cdc_serial_out_waiting_obj) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_reset_input_buffer), MP_ROM_PTR(&usb_cdc_serial_reset_input_buffer_obj) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_reset_output_buffer), MP_ROM_PTR(&usb_cdc_serial_reset_output_buffer_obj) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_timeout), MP_ROM_PTR(&usb_cdc_serial_timeout_obj) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_write_timeout), MP_ROM_PTR(&usb_cdc_serial_write_timeout_obj) },
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// Not in pyserial protocol.
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{ MP_OBJ_NEW_QSTR(MP_QSTR_connected), MP_ROM_PTR(&usb_cdc_serial_connected_obj) },
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};
STATIC MP_DEFINE_CONST_DICT(usb_cdc_serial_locals_dict, usb_cdc_serial_locals_dict_table);
STATIC const mp_stream_p_t usb_cdc_serial_stream_p = {
MP_PROTO_IMPLEMENT(MP_QSTR_protocol_stream)
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.read = usb_cdc_serial_read_stream,
.write = usb_cdc_serial_write_stream,
.ioctl = usb_cdc_serial_ioctl_stream,
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.is_text = false,
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.pyserial_read_compatibility = true,
.pyserial_readinto_compatibility = true,
.pyserial_dont_return_none_compatibility = true,
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};
const mp_obj_type_t usb_cdc_serial_type = {
{ &mp_type_type },
.name = MP_QSTR_Serial,
.getiter = mp_identity_getiter,
.iternext = mp_stream_unbuffered_iter,
.protocol = &usb_cdc_serial_stream_p,
.locals_dict = (mp_obj_dict_t*)&usb_cdc_serial_locals_dict,
};