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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2018 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-bindings/busio/SPI.h"
#include "shared-bindings/digitalio/DigitalInOut.h"
#include "shared-bindings/time/__init__.h"
#include "tick.h"
void common_hal_displayio_fourwire_construct(displayio_fourwire_obj_t* self,
busio_spi_obj_t* spi, const mcu_pin_obj_t* command,
const mcu_pin_obj_t* chip_select, const mcu_pin_obj_t* reset) {
self->bus = spi;
common_hal_busio_spi_never_reset(self->bus);
common_hal_digitalio_digitalinout_construct(&self->command, command);
common_hal_digitalio_digitalinout_switch_to_output(&self->command, true, DRIVE_MODE_PUSH_PULL);
common_hal_digitalio_digitalinout_construct(&self->chip_select, chip_select);
common_hal_digitalio_digitalinout_switch_to_output(&self->chip_select, true, DRIVE_MODE_PUSH_PULL);
if (reset != NULL) {
common_hal_digitalio_digitalinout_construct(&self->reset, reset);
common_hal_digitalio_digitalinout_switch_to_output(&self->reset, true, DRIVE_MODE_PUSH_PULL);
never_reset_pin_number(reset->number);
}
never_reset_pin_number(command->number);
never_reset_pin_number(chip_select->number);
}
void common_hal_displayio_fourwire_deinit(displayio_fourwire_obj_t* self) {
if (self->bus == &self->inline_bus) {
common_hal_busio_spi_deinit(self->bus);
}
reset_pin_number(self->command.pin->number);
reset_pin_number(self->chip_select.pin->number);
reset_pin_number(self->reset.pin->number);
}
bool common_hal_displayio_fourwire_begin_transaction(mp_obj_t obj) {
displayio_fourwire_obj_t* self = MP_OBJ_TO_PTR(obj);
if (!common_hal_busio_spi_try_lock(self->bus)) {
return false;
}
// TODO(tannewt): Stop hardcoding SPI frequency, polarity and phase.
common_hal_busio_spi_configure(self->bus, 12000000, 0, 0, 8);
common_hal_digitalio_digitalinout_set_value(&self->chip_select, false);
return true;
}
void common_hal_displayio_fourwire_send(mp_obj_t obj, bool command, uint8_t *data, uint32_t data_length) {
displayio_fourwire_obj_t* self = MP_OBJ_TO_PTR(obj);
if (command) {
common_hal_digitalio_digitalinout_set_value(&self->chip_select, true);
common_hal_time_delay_ms(1);
common_hal_digitalio_digitalinout_set_value(&self->chip_select, false);
}
common_hal_digitalio_digitalinout_set_value(&self->command, !command);
common_hal_busio_spi_write(self->bus, data, data_length);
}
void common_hal_displayio_fourwire_end_transaction(mp_obj_t obj) {
displayio_fourwire_obj_t* self = MP_OBJ_TO_PTR(obj);
common_hal_digitalio_digitalinout_set_value(&self->chip_select, true);
common_hal_busio_spi_unlock(self->bus);
}
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