104 lines
4.2 KiB
C
104 lines
4.2 KiB
C
/*
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* This file is part of the MicroPython 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 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 "py/gc.h"
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#include "shared-bindings/busio/SPI.h"
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#include "shared-bindings/digitalio/DigitalInOut.h"
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#include "shared-bindings/time/__init__.h"
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#include "tick.h"
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void common_hal_displayio_fourwire_construct(displayio_fourwire_obj_t* self,
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busio_spi_obj_t* spi, const mcu_pin_obj_t* command,
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const mcu_pin_obj_t* chip_select, const mcu_pin_obj_t* reset) {
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self->bus = spi;
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common_hal_busio_spi_never_reset(self->bus);
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// Our object is statically allocated off the heap so make sure the bus object lives to the end
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// of the heap as well.
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gc_never_free(self->bus);
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self->frequency = common_hal_busio_spi_get_frequency(spi);
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self->polarity = common_hal_busio_spi_get_polarity(spi);
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self->phase = common_hal_busio_spi_get_phase(spi);
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common_hal_digitalio_digitalinout_construct(&self->command, command);
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common_hal_digitalio_digitalinout_switch_to_output(&self->command, true, DRIVE_MODE_PUSH_PULL);
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common_hal_digitalio_digitalinout_construct(&self->chip_select, chip_select);
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common_hal_digitalio_digitalinout_switch_to_output(&self->chip_select, true, DRIVE_MODE_PUSH_PULL);
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if (reset != NULL) {
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common_hal_digitalio_digitalinout_construct(&self->reset, reset);
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common_hal_digitalio_digitalinout_switch_to_output(&self->reset, true, DRIVE_MODE_PUSH_PULL);
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never_reset_pin_number(reset->number);
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}
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never_reset_pin_number(command->number);
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never_reset_pin_number(chip_select->number);
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}
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void common_hal_displayio_fourwire_deinit(displayio_fourwire_obj_t* self) {
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if (self->bus == &self->inline_bus) {
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common_hal_busio_spi_deinit(self->bus);
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}
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reset_pin_number(self->command.pin->number);
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reset_pin_number(self->chip_select.pin->number);
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reset_pin_number(self->reset.pin->number);
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}
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bool common_hal_displayio_fourwire_begin_transaction(mp_obj_t obj) {
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displayio_fourwire_obj_t* self = MP_OBJ_TO_PTR(obj);
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if (!common_hal_busio_spi_try_lock(self->bus)) {
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return false;
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}
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common_hal_busio_spi_configure(self->bus, self->frequency, self->polarity,
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self->phase, 8);
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common_hal_digitalio_digitalinout_set_value(&self->chip_select, false);
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return true;
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}
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void common_hal_displayio_fourwire_send(mp_obj_t obj, bool command, uint8_t *data, uint32_t data_length) {
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displayio_fourwire_obj_t* self = MP_OBJ_TO_PTR(obj);
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if (command) {
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common_hal_digitalio_digitalinout_set_value(&self->chip_select, true);
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common_hal_time_delay_ms(1);
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common_hal_digitalio_digitalinout_set_value(&self->chip_select, false);
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}
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common_hal_digitalio_digitalinout_set_value(&self->command, !command);
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common_hal_busio_spi_write(self->bus, data, data_length);
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}
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void common_hal_displayio_fourwire_end_transaction(mp_obj_t obj) {
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displayio_fourwire_obj_t* self = MP_OBJ_TO_PTR(obj);
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common_hal_digitalio_digitalinout_set_value(&self->chip_select, true);
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common_hal_busio_spi_unlock(self->bus);
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}
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