/* * 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/paralleldisplaybus/ParallelBus.h" #include #include "shared/runtime/context_manager_helpers.h" #include "py/binary.h" #include "py/runtime.h" #include "shared-bindings/microcontroller/Pin.h" #include "shared-bindings/util.h" #include "shared-module/displayio/__init__.h" //| class ParallelBus: //| """Manage updating a display over 8-bit parallel bus in the background while Python code runs. This //| protocol may be referred 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 paralleldisplaybus_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, MP_QSTR_command); const mcu_pin_obj_t *chip_select = validate_obj_is_free_pin(args[ARG_chip_select].u_obj, MP_QSTR_chip_select); const mcu_pin_obj_t *write = validate_obj_is_free_pin(args[ARG_write].u_obj, MP_QSTR_write); const mcu_pin_obj_t *read = validate_obj_is_free_pin_or_none(args[ARG_read].u_obj, MP_QSTR_read); const mcu_pin_obj_t *reset = validate_obj_is_free_pin_or_none(args[ARG_reset].u_obj, MP_QSTR_reset); paralleldisplaybus_parallelbus_obj_t *self = &allocate_display_bus_or_raise()->parallel_bus; self->base.type = ¶lleldisplaybus_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(MP_ERROR_TEXT("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, MP_QSTR_data0); common_hal_paralleldisplaybus_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_paralleldisplaybus_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 paralleldisplaybus_parallelbus_obj_reset(mp_obj_t self_in) { paralleldisplaybus_parallelbus_obj_t *self = self_in; if (!common_hal_paralleldisplaybus_parallelbus_reset(self)) { mp_raise_RuntimeError_varg(MP_ERROR_TEXT("No %q pin"), MP_QSTR_reset); } return mp_const_none; } MP_DEFINE_CONST_FUN_OBJ_1(paralleldisplaybus_parallelbus_reset_obj, paralleldisplaybus_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 paralleldisplaybus_parallelbus_obj_send(mp_obj_t self, mp_obj_t command_obj, mp_obj_t data_obj) { mp_int_t command_int = mp_arg_validate_int_range(mp_obj_get_int(command_obj), 0, 255, MP_QSTR_command); 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_paralleldisplaybus_parallelbus_begin_transaction(self)) { RUN_BACKGROUND_TASKS; } common_hal_paralleldisplaybus_parallelbus_send(self, DISPLAY_COMMAND, CHIP_SELECT_UNTOUCHED, &command, 1); common_hal_paralleldisplaybus_parallelbus_send(self, DISPLAY_DATA, CHIP_SELECT_UNTOUCHED, ((uint8_t *)bufinfo.buf), bufinfo.len); common_hal_paralleldisplaybus_parallelbus_end_transaction(self); return mp_const_none; } MP_DEFINE_CONST_FUN_OBJ_3(paralleldisplaybus_parallelbus_send_obj, paralleldisplaybus_parallelbus_obj_send); STATIC const mp_rom_map_elem_t paralleldisplaybus_parallelbus_locals_dict_table[] = { { MP_ROM_QSTR(MP_QSTR_reset), MP_ROM_PTR(¶lleldisplaybus_parallelbus_reset_obj) }, { MP_ROM_QSTR(MP_QSTR_send), MP_ROM_PTR(¶lleldisplaybus_parallelbus_send_obj) }, }; STATIC MP_DEFINE_CONST_DICT(paralleldisplaybus_parallelbus_locals_dict, paralleldisplaybus_parallelbus_locals_dict_table); MP_DEFINE_CONST_OBJ_TYPE( paralleldisplaybus_parallelbus_type, MP_QSTR_ParallelBus, MP_TYPE_FLAG_NONE, make_new, paralleldisplaybus_parallelbus_make_new, locals_dict, ¶lleldisplaybus_parallelbus_locals_dict );