add circuitpython code

1 files changed, 172 insertions, 0 deletions

diff --git a/circuitpython/shared-bindings/displayio/FourWire.c b/circuitpython/shared-bindings/displayio/FourWire.c
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+++ b/circuitpython/shared-bindings/displayio/FourWire.c
@@ -0,0 +1,172 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018-2019 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/displayio/FourWire.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/busio/SPI.h"
+#include "shared-bindings/displayio/Group.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/util.h"
+#include "shared-module/displayio/__init__.h"
+#include "supervisor/shared/translate.h"
+
+//| class FourWire:
+//|     """Manage updating a display over SPI four wire protocol in the background while Python code runs.
+//|     It doesn't handle display initialization."""
+//|
+//|     def __init__(self, spi_bus: busio.SPI, *, command: Optional[microcontroller.Pin], chip_select: microcontroller.Pin, reset: Optional[microcontroller.Pin] = None, baudrate: int = 24000000, polarity: int = 0, phase: int = 0) -> None:
+//|         """Create a FourWire object associated with the given pins.
+//|
+//|         The SPI 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.
+//|
+//|         If the ``command`` pin is not specified, a 9-bit SPI mode will be simulated by adding a
+//|         data/command bit to every bit being transmitted, and splitting the resulting data back
+//|         into 8-bit bytes for transmission. The extra bits that this creates at the end are ignored
+//|         by the receiving device.
+//|
+//|         :param busio.SPI spi_bus: The SPI bus that make up the clock and data lines
+//|         :param microcontroller.Pin command: Data or command pin. When None, 9-bit SPI is simulated.
+//|         :param microcontroller.Pin chip_select: Chip select pin
+//|         :param microcontroller.Pin reset: Reset pin. When None only software reset can be used
+//|         :param int baudrate: Maximum baudrate in Hz for the display on the bus
+//|         :param int polarity: the base state of the clock line (0 or 1)
+//|         :param int phase: the edge of the clock that data is captured. First (0)
+//|             or second (1). Rising or falling depends on clock polarity."""
+//|         ...
+//|
+STATIC mp_obj_t displayio_fourwire_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
+    enum { ARG_spi_bus, ARG_command, ARG_chip_select, ARG_reset, ARG_baudrate, ARG_polarity, ARG_phase };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_spi_bus, MP_ARG_REQUIRED | MP_ARG_OBJ },
+        { MP_QSTR_command, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none} },
+        { MP_QSTR_chip_select, MP_ARG_OBJ | MP_ARG_KW_ONLY | MP_ARG_REQUIRED },
+        { MP_QSTR_reset, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none} },
+        { MP_QSTR_baudrate, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 24000000} },
+        { MP_QSTR_polarity, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
+        { MP_QSTR_phase, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
+    };
+    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_or_none(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 *reset = validate_obj_is_free_pin_or_none(args[ARG_reset].u_obj);
+
+    mp_obj_t spi = mp_arg_validate_type(args[ARG_spi_bus].u_obj, &busio_spi_type, MP_QSTR_spi_bus);
+
+    displayio_fourwire_obj_t *self = &allocate_display_bus_or_raise()->fourwire_bus;
+    self->base.type = &displayio_fourwire_type;
+
+    uint8_t polarity = args[ARG_polarity].u_int;
+    if (polarity != 0 && polarity != 1) {
+        mp_raise_ValueError(translate("Invalid polarity"));
+    }
+    uint8_t phase = args[ARG_phase].u_int;
+    if (phase != 0 && phase != 1) {
+        mp_raise_ValueError(translate("Invalid phase"));
+    }
+
+    common_hal_displayio_fourwire_construct(self,
+        MP_OBJ_TO_PTR(spi), command, chip_select, reset, args[ARG_baudrate].u_int, polarity, phase);
+    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 displayio_fourwire_obj_reset(mp_obj_t self_in) {
+    displayio_fourwire_obj_t *self = self_in;
+
+    if (!common_hal_displayio_fourwire_reset(self)) {
+        mp_raise_RuntimeError(translate("no reset pin available"));
+    }
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(displayio_fourwire_reset_obj, displayio_fourwire_obj_reset);
+
+//|     def send(self, command: int, data: ReadableBuffer, *, toggle_every_byte: bool = False) -> 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 displayio_fourwire_obj_send(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_command, ARG_data, ARG_toggle_every_byte };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_command, MP_ARG_INT | MP_ARG_REQUIRED },
+        { MP_QSTR_data, MP_ARG_OBJ | MP_ARG_REQUIRED },
+        { MP_QSTR_toggle_every_byte, MP_ARG_BOOL | MP_ARG_KW_ONLY, {.u_bool = false} },
+    };
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    mp_int_t command_int = args[ARG_command].u_int;
+    if (command_int > 255 || command_int < 0) {
+        mp_raise_ValueError(translate("Command must be an int between 0 and 255"));
+    }
+    displayio_fourwire_obj_t *self = pos_args[0];
+    uint8_t command = command_int;
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(args[ARG_data].u_obj, &bufinfo, MP_BUFFER_READ);
+
+    // Wait for display bus to be available.
+    while (!common_hal_displayio_fourwire_begin_transaction(self)) {
+        RUN_BACKGROUND_TASKS;
+    }
+    display_chip_select_behavior_t chip_select = CHIP_SELECT_UNTOUCHED;
+    if (args[ARG_toggle_every_byte].u_bool) {
+        chip_select = CHIP_SELECT_TOGGLE_EVERY_BYTE;
+    }
+    common_hal_displayio_fourwire_send(self, DISPLAY_COMMAND, chip_select, &command, 1);
+    common_hal_displayio_fourwire_send(self, DISPLAY_DATA, chip_select, ((uint8_t *)bufinfo.buf), bufinfo.len);
+    common_hal_displayio_fourwire_end_transaction(self);
+
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_KW(displayio_fourwire_send_obj, 1, displayio_fourwire_obj_send);
+
+STATIC const mp_rom_map_elem_t displayio_fourwire_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_reset), MP_ROM_PTR(&displayio_fourwire_reset_obj) },
+    { MP_ROM_QSTR(MP_QSTR_send), MP_ROM_PTR(&displayio_fourwire_send_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(displayio_fourwire_locals_dict, displayio_fourwire_locals_dict_table);
+
+const mp_obj_type_t displayio_fourwire_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_FourWire,
+    .make_new = displayio_fourwire_make_new,
+    .locals_dict = (mp_obj_dict_t *)&displayio_fourwire_locals_dict,
+};