124 lines
4.8 KiB
C
124 lines
4.8 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/I2CDisplay.h"
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#include <stdint.h>
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#include <string.h>
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#include "py/gc.h"
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#include "py/runtime.h"
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#include "shared-bindings/busio/I2C.h"
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#include "shared-bindings/digitalio/DigitalInOut.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#include "shared-bindings/microcontroller/__init__.h"
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#include "shared-bindings/time/__init__.h"
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#include "shared-module/displayio/display_core.h"
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void common_hal_displayio_i2cdisplay_construct(displayio_i2cdisplay_obj_t* self,
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busio_i2c_obj_t* i2c, uint16_t device_address, const mcu_pin_obj_t* reset) {
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// Reset the display before probing
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self->reset.base.type = &mp_type_NoneType;
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if (reset != NULL) {
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self->reset.base.type = &digitalio_digitalinout_type;
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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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common_hal_never_reset_pin(reset);
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common_hal_displayio_i2cdisplay_reset(self);
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}
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// Probe the bus to see if a device acknowledges the given address.
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if (!common_hal_busio_i2c_probe(i2c, device_address)) {
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mp_raise_ValueError_varg(translate("Unable to find I2C Display at %x"), device_address);
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}
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// Write to the device and return 0 on success or an appropriate error code from mperrno.h
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self->bus = i2c;
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common_hal_busio_i2c_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->address = device_address;
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}
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void common_hal_displayio_i2cdisplay_deinit(displayio_i2cdisplay_obj_t* self) {
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if (self->bus == &self->inline_bus) {
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common_hal_busio_i2c_deinit(self->bus);
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}
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common_hal_reset_pin(self->reset.pin);
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}
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bool common_hal_displayio_i2cdisplay_reset(mp_obj_t obj) {
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displayio_i2cdisplay_obj_t* self = MP_OBJ_TO_PTR(obj);
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if (self->reset.base.type == &mp_type_NoneType) {
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return false;
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}
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common_hal_digitalio_digitalinout_set_value(&self->reset, false);
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common_hal_mcu_delay_us(4);
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common_hal_digitalio_digitalinout_set_value(&self->reset, true);
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return true;
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}
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bool common_hal_displayio_i2cdisplay_bus_free(mp_obj_t obj) {
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displayio_i2cdisplay_obj_t* self = MP_OBJ_TO_PTR(obj);
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if (!common_hal_busio_i2c_try_lock(self->bus)) {
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return false;
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}
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common_hal_busio_i2c_unlock(self->bus);
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return true;
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}
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bool common_hal_displayio_i2cdisplay_begin_transaction(mp_obj_t obj) {
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displayio_i2cdisplay_obj_t* self = MP_OBJ_TO_PTR(obj);
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return common_hal_busio_i2c_try_lock(self->bus);
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}
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void common_hal_displayio_i2cdisplay_send(mp_obj_t obj, display_byte_type_t data_type, display_chip_select_behavior_t chip_select, uint8_t *data, uint32_t data_length) {
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displayio_i2cdisplay_obj_t* self = MP_OBJ_TO_PTR(obj);
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if (data_type == DISPLAY_COMMAND) {
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uint8_t command_bytes[2 * data_length];
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for (uint32_t i = 0; i < data_length; i++) {
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command_bytes[2 * i] = 0x80;
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command_bytes[2 * i + 1] = data[i];
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}
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common_hal_busio_i2c_write(self->bus, self->address, command_bytes, 2 * data_length, true);
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} else {
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uint8_t data_bytes[data_length + 1];
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data_bytes[0] = 0x40;
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memcpy(data_bytes + 1, data, data_length);
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common_hal_busio_i2c_write(self->bus, self->address, data_bytes, data_length + 1, true);
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}
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}
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void common_hal_displayio_i2cdisplay_end_transaction(mp_obj_t obj) {
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displayio_i2cdisplay_obj_t* self = MP_OBJ_TO_PTR(obj);
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common_hal_busio_i2c_unlock(self->bus);
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}
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