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Diffstat (limited to 'circuitpython/shared-bindings/paralleldisplay/ParallelBus.c')
| -rw-r--r-- | circuitpython/shared-bindings/paralleldisplay/ParallelBus.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/circuitpython/shared-bindings/paralleldisplay/ParallelBus.c b/circuitpython/shared-bindings/paralleldisplay/ParallelBus.c new file mode 100644 index 0000000..6e6e778 --- /dev/null +++ b/circuitpython/shared-bindings/paralleldisplay/ParallelBus.c @@ -0,0 +1,160 @@ +/* + * This file is part of the Micro Python project, http://micropython.org/ + * + * The MIT License (MIT) + * + * Copyright (c) 2019 Scott Shawcroft 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 "shared-bindings/paralleldisplay/ParallelBus.h" + +#include <stdint.h> + +#include "shared/runtime/context_manager_helpers.h" +#include "py/binary.h" +#include "py/objproperty.h" +#include "py/runtime.h" +#include "shared-bindings/microcontroller/Pin.h" +#include "shared-bindings/util.h" +#include "shared-module/displayio/__init__.h" +#include "supervisor/shared/translate.h" + +//| class ParallelBus: +//| """Manage updating a display over 8-bit parallel bus in the background while Python code runs. This +//| protocol may be refered to as 8080-I Series Parallel Interface in datasheets. It doesn't handle +//| display initialization.""" +//| +//| def __init__(self, *, data0: microcontroller.Pin, command: microcontroller.Pin, chip_select: microcontroller.Pin, write: microcontroller.Pin, read: Optional[microcontroller.Pin], reset: Optional[microcontroller.Pin] = None, frequency: int = 30_000_000) -> None: +//| """Create a ParallelBus object associated with the given pins. The bus is inferred from data0 +//| by implying the next 7 additional pins on a given GPIO port. +//| +//| The parallel bus and pins are then in use by the display until `displayio.release_displays()` +//| is called even after a reload. (It does this so CircuitPython can use the display after your +//| code is done.) So, the first time you initialize a display bus in code.py you should call +//| :py:func:`displayio.release_displays` first, otherwise it will error after the first code.py run. +//| +//| :param microcontroller.Pin data_pins: A list of data pins. Specify exactly one of ``data_pins`` or ``data0``. +//| :param microcontroller.Pin data0: The first data pin. The rest are implied +//| :param microcontroller.Pin command: Data or command pin +//| :param microcontroller.Pin chip_select: Chip select pin +//| :param microcontroller.Pin write: Write pin +//| :param microcontroller.Pin read: Read pin, optional +//| :param microcontroller.Pin reset: Reset pin, optional +//| :param int frequency: The communication frequency in Hz for the display on the bus""" +//| ... +//| +STATIC mp_obj_t paralleldisplay_parallelbus_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) { + enum { ARG_data0, ARG_data_pins, ARG_command, ARG_chip_select, ARG_write, ARG_read, ARG_reset, ARG_frequency }; + static const mp_arg_t allowed_args[] = { + { MP_QSTR_data0, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none } }, + { MP_QSTR_data_pins, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none } }, + { MP_QSTR_command, MP_ARG_OBJ | MP_ARG_KW_ONLY | MP_ARG_REQUIRED }, + { MP_QSTR_chip_select, MP_ARG_OBJ | MP_ARG_KW_ONLY | MP_ARG_REQUIRED }, + { MP_QSTR_write, MP_ARG_OBJ | MP_ARG_KW_ONLY | MP_ARG_REQUIRED }, + { MP_QSTR_read, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none } }, + { MP_QSTR_reset, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none } }, + { MP_QSTR_frequency, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 30000000 } }, + }; + 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); + + const mcu_pin_obj_t *command = validate_obj_is_free_pin(args[ARG_command].u_obj); + const mcu_pin_obj_t *chip_select = validate_obj_is_free_pin(args[ARG_chip_select].u_obj); + const mcu_pin_obj_t *write = validate_obj_is_free_pin(args[ARG_write].u_obj); + const mcu_pin_obj_t *read = validate_obj_is_free_pin_or_none(args[ARG_read].u_obj); + const mcu_pin_obj_t *reset = validate_obj_is_free_pin_or_none(args[ARG_reset].u_obj); + + paralleldisplay_parallelbus_obj_t *self = &allocate_display_bus_or_raise()->parallel_bus; + self->base.type = ¶lleldisplay_parallelbus_type; + + bool specified_data0 = args[ARG_data0].u_obj != mp_const_none; + bool specified_data_pins = args[ARG_data_pins].u_obj != mp_const_none; + + if (specified_data0 == specified_data_pins) { + mp_raise_ValueError(translate("Specify exactly one of data0 or data_pins")); + } + + if (specified_data0) { + const mcu_pin_obj_t *data0 = validate_obj_is_free_pin(args[ARG_data0].u_obj); + common_hal_paralleldisplay_parallelbus_construct(self, data0, command, chip_select, write, read, reset, args[ARG_frequency].u_int); + } else { + uint8_t num_pins; + const mcu_pin_obj_t *data_pins[16]; + validate_list_is_free_pins(MP_QSTR_data_pins, data_pins, (mp_int_t)MP_ARRAY_SIZE(data_pins), args[ARG_data_pins].u_obj, &num_pins); + common_hal_paralleldisplay_parallelbus_construct_nonsequential(self, num_pins, data_pins, command, chip_select, write, read, reset, args[ARG_frequency].u_int); + } + return self; +} + +//| def reset(self) -> None: +//| """Performs a hardware reset via the reset pin. Raises an exception if called when no reset pin +//| is available.""" +//| ... +//| + +STATIC mp_obj_t paralleldisplay_parallelbus_obj_reset(mp_obj_t self_in) { + paralleldisplay_parallelbus_obj_t *self = self_in; + + if (!common_hal_paralleldisplay_parallelbus_reset(self)) { + mp_raise_RuntimeError(translate("no reset pin available")); + } + return mp_const_none; +} +MP_DEFINE_CONST_FUN_OBJ_1(paralleldisplay_parallelbus_reset_obj, paralleldisplay_parallelbus_obj_reset); + +//| def send(self, command: int, data: ReadableBuffer) -> None: +//| """Sends the given command value followed by the full set of data. Display state, such as +//| vertical scroll, set via ``send`` may or may not be reset once the code is done.""" +//| ... +//| +STATIC mp_obj_t paralleldisplay_parallelbus_obj_send(mp_obj_t self, mp_obj_t command_obj, mp_obj_t data_obj) { + mp_int_t command_int = MP_OBJ_SMALL_INT_VALUE(command_obj); + if (!mp_obj_is_small_int(command_obj) || command_int > 255 || command_int < 0) { + mp_raise_ValueError(translate("Command must be an int between 0 and 255")); + } + uint8_t command = command_int; + mp_buffer_info_t bufinfo; + mp_get_buffer_raise(data_obj, &bufinfo, MP_BUFFER_READ); + + // Wait for display bus to be available. + while (!common_hal_paralleldisplay_parallelbus_begin_transaction(self)) { + RUN_BACKGROUND_TASKS; + } + common_hal_paralleldisplay_parallelbus_send(self, DISPLAY_COMMAND, CHIP_SELECT_UNTOUCHED, &command, 1); + common_hal_paralleldisplay_parallelbus_send(self, DISPLAY_DATA, CHIP_SELECT_UNTOUCHED, ((uint8_t *)bufinfo.buf), bufinfo.len); + common_hal_paralleldisplay_parallelbus_end_transaction(self); + + return mp_const_none; +} +MP_DEFINE_CONST_FUN_OBJ_3(paralleldisplay_parallelbus_send_obj, paralleldisplay_parallelbus_obj_send); + +STATIC const mp_rom_map_elem_t paralleldisplay_parallelbus_locals_dict_table[] = { + { MP_ROM_QSTR(MP_QSTR_reset), MP_ROM_PTR(¶lleldisplay_parallelbus_reset_obj) }, + { MP_ROM_QSTR(MP_QSTR_send), MP_ROM_PTR(¶lleldisplay_parallelbus_send_obj) }, +}; +STATIC MP_DEFINE_CONST_DICT(paralleldisplay_parallelbus_locals_dict, paralleldisplay_parallelbus_locals_dict_table); + +const mp_obj_type_t paralleldisplay_parallelbus_type = { + { &mp_type_type }, + .name = MP_QSTR_ParallelBus, + .make_new = paralleldisplay_parallelbus_make_new, + .locals_dict = (mp_obj_dict_t *)¶lleldisplay_parallelbus_locals_dict, +}; |