173 lines
7.5 KiB
C
173 lines
7.5 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2018-2019 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "shared-bindings/displayio/FourWire.h"
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#include <stdint.h>
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#include "lib/utils/context_manager_helpers.h"
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#include "py/binary.h"
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#include "py/objproperty.h"
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#include "py/runtime.h"
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#include "shared-bindings/displayio/Group.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#include "shared-bindings/util.h"
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#include "shared-module/displayio/__init__.h"
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#include "supervisor/shared/translate.h"
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//| .. currentmodule:: displayio
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//|
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//| :class:`FourWire` -- Manage updating a display over SPI four wire protocol
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//| ==========================================================================
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//|
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//| Manage updating a display over SPI four wire protocol in the background while Python code runs.
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//| It doesn't handle display initialization.
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//|
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//| .. class:: FourWire(spi_bus, *, command, chip_select, reset=None, baudrate=24000000)
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//|
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//| Create a FourWire object associated with the given pins.
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//|
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//| The SPI bus and pins are then in use by the display until `displayio.release_displays()` is
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//| called even after a reload. (It does this so CircuitPython can use the display after your code
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//| is done.) So, the first time you initialize a display bus in code.py you should call
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//| :py:func`displayio.release_displays` first, otherwise it will error after the first code.py run.
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//|
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//| :param busio.SPI spi_bus: The SPI bus that make up the clock and data lines
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//| :param microcontroller.Pin command: Data or command pin
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//| :param microcontroller.Pin chip_select: Chip select pin
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//| :param microcontroller.Pin reset: Reset pin. When None only software reset can be used
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//| :param int baudrate: Maximum baudrate in Hz for the display on the bus
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//|
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STATIC mp_obj_t displayio_fourwire_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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enum { ARG_spi_bus, ARG_command, ARG_chip_select, ARG_reset, ARG_baudrate };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_spi_bus, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_command, MP_ARG_OBJ | MP_ARG_KW_ONLY | MP_ARG_REQUIRED },
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{ MP_QSTR_chip_select, MP_ARG_OBJ | MP_ARG_KW_ONLY | MP_ARG_REQUIRED },
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{ MP_QSTR_reset, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none} },
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{ MP_QSTR_baudrate, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 24000000} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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mp_obj_t command = args[ARG_command].u_obj;
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mp_obj_t chip_select = args[ARG_chip_select].u_obj;
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assert_pin_free(command);
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assert_pin_free(chip_select);
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mp_obj_t reset = args[ARG_reset].u_obj;
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if (reset != mp_const_none) {
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assert_pin_free(reset);
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} else {
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reset = NULL;
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}
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displayio_fourwire_obj_t* self = NULL;
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mp_obj_t spi = args[ARG_spi_bus].u_obj;
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for (uint8_t i = 0; i < CIRCUITPY_DISPLAY_LIMIT; i++) {
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if (displays[i].fourwire_bus.base.type == NULL ||
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displays[i].fourwire_bus.base.type == &mp_type_NoneType) {
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self = &displays[i].fourwire_bus;
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self->base.type = &displayio_fourwire_type;
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break;
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}
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}
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if (self == NULL) {
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mp_raise_RuntimeError(translate("Too many display busses"));
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}
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common_hal_displayio_fourwire_construct(self,
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MP_OBJ_TO_PTR(spi), command, chip_select, reset, args[ARG_baudrate].u_int);
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return self;
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}
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//| .. method:: reset()
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//|
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//| Performs a hardware reset via the reset pin. Raises an exception if called when no reset pin
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//| is available.
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//|
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STATIC mp_obj_t displayio_fourwire_obj_reset(mp_obj_t self_in) {
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displayio_fourwire_obj_t *self = self_in;
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if (!common_hal_displayio_fourwire_reset(self)) {
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mp_raise_RuntimeError(translate("no reset pin available"));
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}
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_1(displayio_fourwire_reset_obj, displayio_fourwire_obj_reset);
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//| .. method:: send(command, data, *, toggle_every_byte=False)
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//|
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//| Sends the given command value followed by the full set of data. Display state, such as
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//| vertical scroll, set via ``send`` may or may not be reset once the code is done.
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//|
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STATIC mp_obj_t displayio_fourwire_obj_send(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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enum { ARG_command, ARG_data, ARG_toggle_every_byte };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_command, MP_ARG_INT | MP_ARG_REQUIRED },
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{ MP_QSTR_data, MP_ARG_OBJ | MP_ARG_REQUIRED },
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{ MP_QSTR_toggle_every_byte, MP_ARG_BOOL | MP_ARG_KW_ONLY, {.u_bool = false} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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mp_int_t command_int = args[ARG_command].u_int;
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if (command_int > 255 || command_int < 0) {
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mp_raise_ValueError(translate("Command must be an int between 0 and 255"));
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}
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displayio_fourwire_obj_t *self = pos_args[0];
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uint8_t command = command_int;
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(args[ARG_data].u_obj, &bufinfo, MP_BUFFER_READ);
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// Wait for display bus to be available.
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while (!common_hal_displayio_fourwire_begin_transaction(self)) {
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RUN_BACKGROUND_TASKS;
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}
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display_chip_select_behavior_t chip_select = CHIP_SELECT_UNTOUCHED;
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if (args[ARG_toggle_every_byte].u_bool) {
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chip_select = CHIP_SELECT_TOGGLE_EVERY_BYTE;
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}
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common_hal_displayio_fourwire_send(self, DISPLAY_COMMAND, chip_select, &command, 1);
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common_hal_displayio_fourwire_send(self, DISPLAY_DATA, chip_select, ((uint8_t*) bufinfo.buf), bufinfo.len);
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common_hal_displayio_fourwire_end_transaction(self);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(displayio_fourwire_send_obj, 3, displayio_fourwire_obj_send);
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STATIC const mp_rom_map_elem_t displayio_fourwire_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_reset), MP_ROM_PTR(&displayio_fourwire_reset_obj) },
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{ MP_ROM_QSTR(MP_QSTR_send), MP_ROM_PTR(&displayio_fourwire_send_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(displayio_fourwire_locals_dict, displayio_fourwire_locals_dict_table);
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const mp_obj_type_t displayio_fourwire_type = {
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{ &mp_type_type },
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.name = MP_QSTR_FourWire,
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.make_new = displayio_fourwire_make_new,
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.locals_dict = (mp_obj_dict_t*)&displayio_fourwire_locals_dict,
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};
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