circuitpython/shared-module/displayio/bus_core.c

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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-module/displayio/bus_core.h"
#include "py/gc.h"
#include "py/runtime.h"
#if CIRCUITPY_FOURWIRE
#include "shared-bindings/fourwire/FourWire.h"
#endif
#if CIRCUITPY_I2CDISPLAYBUS
#include "shared-bindings/i2cdisplaybus/I2CDisplayBus.h"
#endif
#if CIRCUITPY_PARALLELDISPLAYBUS
#include "shared-bindings/paralleldisplaybus/ParallelBus.h"
#endif
#include "shared-bindings/microcontroller/Pin.h"
#include "shared-bindings/time/__init__.h"
#include "shared-module/displayio/__init__.h"
#include "shared-module/displayio/display_core.h"
#include "supervisor/shared/display.h"
#include "supervisor/shared/tick.h"
#include <stdint.h>
#include <string.h>
#define DISPLAYIO_CORE_DEBUG(...) (void)0
// #define DISPLAYIO_CORE_DEBUG(...) mp_printf(&mp_plat_print __VA_OPT__(,) __VA_ARGS__)
void displayio_display_bus_construct(displayio_display_bus_t *self,
mp_obj_t bus, uint16_t ram_width, uint16_t ram_height, int16_t colstart, int16_t rowstart,
uint16_t column_command, uint16_t row_command, uint16_t set_current_column_command, uint16_t set_current_row_command,
bool data_as_commands, bool always_toggle_chip_select, bool SH1107_addressing, bool address_little_endian) {
self->ram_width = ram_width;
self->ram_height = ram_height;
self->colstart = colstart;
self->rowstart = rowstart;
self->column_command = column_command;
self->row_command = row_command;
self->set_current_column_command = set_current_column_command;
self->set_current_row_command = set_current_row_command;
self->data_as_commands = data_as_commands;
self->always_toggle_chip_select = always_toggle_chip_select;
self->SH1107_addressing = SH1107_addressing;
self->address_little_endian = address_little_endian;
#if CIRCUITPY_PARALLELDISPLAYBUS
if (mp_obj_is_type(bus, &paralleldisplaybus_parallelbus_type)) {
self->bus_reset = common_hal_paralleldisplaybus_parallelbus_reset;
self->bus_free = common_hal_paralleldisplaybus_parallelbus_bus_free;
self->begin_transaction = common_hal_paralleldisplaybus_parallelbus_begin_transaction;
self->send = common_hal_paralleldisplaybus_parallelbus_send;
self->end_transaction = common_hal_paralleldisplaybus_parallelbus_end_transaction;
self->collect_ptrs = common_hal_paralleldisplaybus_parallelbus_collect_ptrs;
} else
#endif
#if CIRCUITPY_FOURWIRE
if (mp_obj_is_type(bus, &fourwire_fourwire_type)) {
self->bus_reset = common_hal_fourwire_fourwire_reset;
self->bus_free = common_hal_fourwire_fourwire_bus_free;
self->begin_transaction = common_hal_fourwire_fourwire_begin_transaction;
self->send = common_hal_fourwire_fourwire_send;
self->end_transaction = common_hal_fourwire_fourwire_end_transaction;
self->collect_ptrs = common_hal_fourwire_fourwire_collect_ptrs;
} else
#endif
#if CIRCUITPY_I2CDISPLAYBUS
if (mp_obj_is_type(bus, &i2cdisplaybus_i2cdisplaybus_type)) {
self->bus_reset = common_hal_i2cdisplaybus_i2cdisplaybus_reset;
self->bus_free = common_hal_i2cdisplaybus_i2cdisplaybus_bus_free;
self->begin_transaction = common_hal_i2cdisplaybus_i2cdisplaybus_begin_transaction;
self->send = common_hal_i2cdisplaybus_i2cdisplaybus_send;
self->end_transaction = common_hal_i2cdisplaybus_i2cdisplaybus_end_transaction;
self->collect_ptrs = common_hal_i2cdisplaybus_i2cdisplaybus_collect_ptrs;
} else
#endif
{
mp_raise_ValueError(MP_ERROR_TEXT("Unsupported display bus type"));
}
self->bus = bus;
}
bool displayio_display_bus_is_free(displayio_display_bus_t *self) {
return !self->bus || self->bus_free(self->bus);
}
bool displayio_display_bus_begin_transaction(displayio_display_bus_t *self) {
return self->begin_transaction(self->bus);
}
void displayio_display_bus_end_transaction(displayio_display_bus_t *self) {
self->end_transaction(self->bus);
}
void displayio_display_bus_set_region_to_update(displayio_display_bus_t *self, displayio_display_core_t *display, displayio_area_t *area) {
uint16_t x1 = area->x1 + self->colstart;
uint16_t x2 = area->x2 + self->colstart;
uint16_t y1 = area->y1 + self->rowstart;
uint16_t y2 = area->y2 + self->rowstart;
// Collapse down the dimension where multiple pixels are in a byte.
if (display->colorspace.depth < 8) {
uint8_t pixels_per_byte = 8 / display->colorspace.depth;
if (display->colorspace.pixels_in_byte_share_row) {
x1 /= pixels_per_byte * display->colorspace.bytes_per_cell;
x2 /= pixels_per_byte * display->colorspace.bytes_per_cell;
} else {
y1 /= pixels_per_byte * display->colorspace.bytes_per_cell;
y2 /= pixels_per_byte * display->colorspace.bytes_per_cell;
}
}
x2 -= 1;
y2 -= 1;
display_chip_select_behavior_t chip_select = CHIP_SELECT_UNTOUCHED;
if (self->always_toggle_chip_select || self->data_as_commands) {
chip_select = CHIP_SELECT_TOGGLE_EVERY_BYTE;
}
// Set column.
displayio_display_bus_begin_transaction(self);
uint8_t data[5];
data[0] = self->column_command;
uint8_t data_length = 1;
display_byte_type_t data_type = DISPLAY_DATA;
if (!self->data_as_commands) {
self->send(self->bus, DISPLAY_COMMAND, CHIP_SELECT_UNTOUCHED, data, 1);
data_length = 0;
} else {
data_type = DISPLAY_COMMAND;
}
if (self->ram_width < 0x100) {
data[data_length++] = x1;
data[data_length++] = x2;
} else {
if (self->address_little_endian) {
x1 = __builtin_bswap16(x1);
x2 = __builtin_bswap16(x2);
}
data[data_length++] = x1 >> 8;
data[data_length++] = x1 & 0xff;
data[data_length++] = x2 >> 8;
data[data_length++] = x2 & 0xff;
}
// Quirk for SH1107 "SH1107_addressing"
// Column lower command = 0x00, Column upper command = 0x10
if (self->SH1107_addressing) {
data[0] = ((x1 >> 4) & 0x0F) | 0x10; // 0x10 to 0x17
data[1] = x1 & 0x0F; // 0x00 to 0x0F
data_length = 2;
}
self->send(self->bus, data_type, chip_select, data, data_length);
displayio_display_bus_end_transaction(self);
if (self->set_current_column_command != NO_COMMAND) {
uint8_t command = self->set_current_column_command;
displayio_display_bus_begin_transaction(self);
self->send(self->bus, DISPLAY_COMMAND, chip_select, &command, 1);
// Only send the first half of data because it is the first coordinate.
self->send(self->bus, DISPLAY_DATA, chip_select, data, data_length / 2);
displayio_display_bus_end_transaction(self);
}
// Set row.
displayio_display_bus_begin_transaction(self);
data[0] = self->row_command;
data_length = 1;
if (!self->data_as_commands) {
self->send(self->bus, DISPLAY_COMMAND, CHIP_SELECT_UNTOUCHED, data, 1);
data_length = 0;
}
if (self->ram_height < 0x100) {
data[data_length++] = y1;
data[data_length++] = y2;
} else {
if (self->address_little_endian) {
y1 = __builtin_bswap16(y1);
y2 = __builtin_bswap16(y2);
}
data[data_length++] = y1 >> 8;
data[data_length++] = y1 & 0xff;
data[data_length++] = y2 >> 8;
data[data_length++] = y2 & 0xff;
}
// Quirk for SH1107 "SH1107_addressing"
// Page address command = 0xB0
if (self->SH1107_addressing) {
// set the page to our y value
data[0] = 0xB0 | y1;
data_length = 1;
}
self->send(self->bus, data_type, chip_select, data, data_length);
displayio_display_bus_end_transaction(self);
if (self->set_current_row_command != NO_COMMAND) {
uint8_t command = self->set_current_row_command;
displayio_display_bus_begin_transaction(self);
self->send(self->bus, DISPLAY_COMMAND, chip_select, &command, 1);
// Only send the first half of data because it is the first coordinate.
self->send(self->bus, DISPLAY_DATA, chip_select, data, data_length / 2);
displayio_display_bus_end_transaction(self);
}
}
void displayio_display_bus_collect_ptrs(displayio_display_bus_t *self) {
self->collect_ptrs(self->bus);
}