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// This file is part of the CircuitPython project: https://circuitpython.org

//

// SPDX-FileCopyrightText: Copyright (c) 2018 Scott Shawcroft for Adafruit Industries

//

// SPDX-License-Identifier: MIT

#include "shared-bindings/i2cdisplaybus/I2CDisplayBus.h"

#include <stdint.h>

#include <string.h>

#include "py/gc.h"

#include "py/runtime.h"

#include "shared-bindings/busio/I2C.h"

#include "shared-bindings/digitalio/DigitalInOut.h"

#include "shared-bindings/microcontroller/Pin.h"

#include "shared-bindings/microcontroller/__init__.h"

#include "shared-bindings/time/__init__.h"

#include "shared-module/displayio/display_core.h"

void common_hal_i2cdisplaybus_i2cdisplaybus_construct(i2cdisplaybus_i2cdisplaybus_obj_t *self,

busio_i2c_obj_t *i2c, uint16_t device_address, const mcu_pin_obj_t *reset) {

// Reset the display before probing

self->reset.base.type = &mp_type_NoneType;

if (reset != NULL) {

self->reset.base.type = &digitalio_digitalinout_type;

common_hal_digitalio_digitalinout_construct(&self->reset, reset);

common_hal_digitalio_digitalinout_switch_to_output(&self->reset, true, DRIVE_MODE_PUSH_PULL);

common_hal_never_reset_pin(reset);

common_hal_i2cdisplaybus_i2cdisplaybus_reset(self);

}

// Probe the bus to see if a device acknowledges the given address.

if (!common_hal_busio_i2c_probe(i2c, device_address)) {

self->base.type = &mp_type_NoneType;

common_hal_i2cdisplaybus_i2cdisplaybus_deinit(self);

mp_raise_ValueError_varg(MP_ERROR_TEXT("Unable to find I2C Display at %x"), device_address);

}

// Write to the device and return 0 on success or an appropriate error code from mperrno.h

self->bus = i2c;

common_hal_busio_i2c_never_reset(self->bus);

self->address = device_address;

}

void common_hal_i2cdisplaybus_i2cdisplaybus_deinit(i2cdisplaybus_i2cdisplaybus_obj_t *self) {

if (self->bus == &self->inline_bus) {

common_hal_busio_i2c_deinit(self->bus);

}

// TODO figure out how to undo never_reset. maybe only mark never_reset when

// we subsume objects off the mp heap.

self->bus = NULL;

if (self->reset.base.type == &digitalio_digitalinout_type) {

common_hal_digitalio_digitalinout_deinit(&self->reset);

}

}

bool common_hal_i2cdisplaybus_i2cdisplaybus_reset(mp_obj_t obj) {

i2cdisplaybus_i2cdisplaybus_obj_t *self = MP_OBJ_TO_PTR(obj);

if (self->reset.base.type == &mp_type_NoneType) {

return false;

}

common_hal_digitalio_digitalinout_set_value(&self->reset, false);

common_hal_mcu_delay_us(4);

common_hal_digitalio_digitalinout_set_value(&self->reset, true);

return true;

}

bool common_hal_i2cdisplaybus_i2cdisplaybus_bus_free(mp_obj_t obj) {

i2cdisplaybus_i2cdisplaybus_obj_t *self = MP_OBJ_TO_PTR(obj);

if (!common_hal_busio_i2c_try_lock(self->bus)) {

return false;

}

common_hal_busio_i2c_unlock(self->bus);

return true;

}

bool common_hal_i2cdisplaybus_i2cdisplaybus_begin_transaction(mp_obj_t obj) {

i2cdisplaybus_i2cdisplaybus_obj_t *self = MP_OBJ_TO_PTR(obj);

return common_hal_busio_i2c_try_lock(self->bus);

}

void common_hal_i2cdisplaybus_i2cdisplaybus_send(mp_obj_t obj, display_byte_type_t data_type,

display_chip_select_behavior_t chip_select, const uint8_t *data, uint32_t data_length) {

i2cdisplaybus_i2cdisplaybus_obj_t *self = MP_OBJ_TO_PTR(obj);

if (data_type == DISPLAY_COMMAND) {

uint8_t command_bytes[2 * data_length];

for (uint32_t i = 0; i < data_length; i++) {

command_bytes[2 * i] = 0x80;

command_bytes[2 * i + 1] = data[i];

}

common_hal_busio_i2c_write(self->bus, self->address, command_bytes, 2 * data_length);

} else {

uint8_t data_bytes[data_length + 1];

data_bytes[0] = 0x40;

memcpy(data_bytes + 1, data, data_length);

common_hal_busio_i2c_write(self->bus, self->address, data_bytes, data_length + 1);

}

}

void common_hal_i2cdisplaybus_i2cdisplaybus_end_transaction(mp_obj_t obj) {

i2cdisplaybus_i2cdisplaybus_obj_t *self = MP_OBJ_TO_PTR(obj);

common_hal_busio_i2c_unlock(self->bus);

}

void common_hal_i2cdisplaybus_i2cdisplaybus_collect_ptrs(mp_obj_t obj) {

i2cdisplaybus_i2cdisplaybus_obj_t *self = MP_OBJ_TO_PTR(obj);

gc_collect_ptr((void *)self->bus);

}