diff options
Diffstat (limited to 'circuitpython/shared-bindings/usb_cdc/Serial.c')
| -rw-r--r-- | circuitpython/shared-bindings/usb_cdc/Serial.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/circuitpython/shared-bindings/usb_cdc/Serial.c b/circuitpython/shared-bindings/usb_cdc/Serial.c new file mode 100644 index 0000000..760efb6 --- /dev/null +++ b/circuitpython/shared-bindings/usb_cdc/Serial.c @@ -0,0 +1,303 @@ +/* + * 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`. +//| The available instances are in the ``usb_cdc.serials`` tuple.""" +//| ... +//| +//| 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. +//| +//| :return: Data read +//| :rtype: bytes""" +//| ... +//| +//| def readinto(self, buf: WriteableBuffer) -> int: +//| """Read bytes into the ``buf``. If ``nbytes`` is specified then read at most +//| that many bytes, subject to `timeout`. Otherwise, read at most ``len(buf)`` bytes. +//| +//| :return: number of bytes read and stored into ``buf`` +//| :rtype: bytes""" +//| ... +//| +//| def readline(self, size: int = -1) -> Optional[bytes]: +//| r"""Read a line ending in a newline character ("\\n"), including the newline. +//| Return everything readable if no newline is found and ``timeout`` is 0. +//| Return ``None`` in case of error. +//| +//| This is a binary stream: the newline character "\\n" cannot be changed. +//| If the host computer transmits "\\r" it will also be included as part of the line. +//| +//| :param int size: maximum number of characters to read. ``-1`` means as many as possible. +//| :return: the line read +//| :rtype: bytes or None""" +//| ... +//| +//| def readlines(self) -> List[Optional[bytes]]: +//| """Read multiple lines as a list, using `readline()`. +//| +//| .. warning:: If ``timeout`` is ``None``, +//| `readlines()` will never return, because there is no way to indicate end of stream. +//| +//| :return: a list of the line read +//| :rtype: list""" +//| ... +//| +//| def write(self, buf: ReadableBuffer) -> int: +//| """Write as many bytes as possible from the buffer of bytes. +//| +//| :return: the number of bytes written +//| :rtype: int""" +//| ... +//| +//| def flush(self) -> None: +//| """Force out any unwritten bytes, waiting until they are written.""" +//| ... +//| + +// These three methods are used by the shared stream methods. +STATIC mp_uint_t usb_cdc_serial_read_stream(mp_obj_t self_in, void *buf_in, mp_uint_t size, int *errcode) { + 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); +} + +STATIC mp_uint_t usb_cdc_serial_write_stream(mp_obj_t self_in, const void *buf_in, mp_uint_t size, int *errcode) { + 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); +} + +STATIC mp_uint_t usb_cdc_serial_ioctl_stream(mp_obj_t self_in, mp_uint_t request, mp_uint_t arg, int *errcode) { + usb_cdc_serial_obj_t *self = MP_OBJ_TO_PTR(self_in); + mp_uint_t ret = 0; + 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; + } + + case MP_STREAM_FLUSH: + common_hal_usb_cdc_serial_flush(self); + break; + + default: + *errcode = MP_EINVAL; + ret = MP_STREAM_ERROR; + } + return ret; +} + +//| 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``. +//| """ +//| +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); + +MP_PROPERTY_GETTER(usb_cdc_serial_connected_obj, + (mp_obj_t)&usb_cdc_serial_get_connected_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); + +MP_PROPERTY_GETTER(usb_cdc_serial_in_waiting_obj, + (mp_obj_t)&usb_cdc_serial_get_in_waiting_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); + +MP_PROPERTY_GETTER(usb_cdc_serial_out_waiting_obj, + (mp_obj_t)&usb_cdc_serial_get_out_waiting_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); + +//| 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); + +MP_PROPERTY_GETSET(usb_cdc_serial_timeout_obj, + (mp_obj_t)&usb_cdc_serial_get_timeout_obj, + (mp_obj_t)&usb_cdc_serial_set_timeout_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); + +MP_PROPERTY_GETSET(usb_cdc_serial_write_timeout_obj, + (mp_obj_t)&usb_cdc_serial_get_write_timeout_obj, + (mp_obj_t)&usb_cdc_serial_set_write_timeout_obj); + + +STATIC const mp_rom_map_elem_t usb_cdc_serial_locals_dict_table[] = { + // Standard stream methods. + { MP_ROM_QSTR(MP_QSTR_flush), MP_ROM_PTR(&mp_stream_flush_obj) }, + { 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) }, + { 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)}, + { MP_OBJ_NEW_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) }, + + // 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) }, + { 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) }, + + // Not in pyserial protocol. + { MP_OBJ_NEW_QSTR(MP_QSTR_connected), MP_ROM_PTR(&usb_cdc_serial_connected_obj) }, + + + +}; +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) + .read = usb_cdc_serial_read_stream, + .write = usb_cdc_serial_write_stream, + .ioctl = usb_cdc_serial_ioctl_stream, + .is_text = false, + .pyserial_read_compatibility = true, + .pyserial_readinto_compatibility = true, + .pyserial_dont_return_none_compatibility = true, +}; + +const mp_obj_type_t usb_cdc_serial_type = { + { &mp_type_type }, + .flags = MP_TYPE_FLAG_EXTENDED, + .name = MP_QSTR_Serial, + .locals_dict = (mp_obj_dict_t *)&usb_cdc_serial_locals_dict, + MP_TYPE_EXTENDED_FIELDS( + .getiter = mp_identity_getiter, + .iternext = mp_stream_unbuffered_iter, + .protocol = &usb_cdc_serial_stream_p, + ), +}; |