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Add st7920 display, (#1440)
Co-authored-by: Oxan van Leeuwen <oxan@oxanvanleeuwen.nl> Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
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marsjan155
GitHub
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@ -129,6 +129,7 @@ esphome/components/ssd1351_base/* @kbx81
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esphome/components/ssd1351_spi/* @kbx81
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esphome/components/st7735/* @SenexCrenshaw
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esphome/components/st7789v/* @kbx81
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esphome/components/st7920/* @marsjan155
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esphome/components/substitutions/* @esphome/core
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esphome/components/sun/* @OttoWinter
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esphome/components/switch/* @esphome/core
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0
esphome/components/st7920/__init__.py
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0
esphome/components/st7920/__init__.py
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42
esphome/components/st7920/display.py
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esphome/components/st7920/display.py
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import esphome.codegen as cg
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import esphome.config_validation as cv
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from esphome.components import display, spi
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from esphome.const import CONF_ID, CONF_LAMBDA, CONF_WIDTH, CONF_HEIGHT
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AUTO_LOAD = ["display"]
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CODEOWNERS = ["@marsjan155"]
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DEPENDENCIES = ["spi"]
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st7920_ns = cg.esphome_ns.namespace("st7920")
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ST7920 = st7920_ns.class_(
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"ST7920", cg.PollingComponent, display.DisplayBuffer, spi.SPIDevice
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)
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ST7920Ref = ST7920.operator("ref")
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CONFIG_SCHEMA = (
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display.FULL_DISPLAY_SCHEMA.extend(
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{
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cv.GenerateID(): cv.declare_id(ST7920),
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cv.Required(CONF_WIDTH): cv.int_,
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cv.Required(CONF_HEIGHT): cv.int_,
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}
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)
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.extend(cv.polling_component_schema("60s"))
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.extend(spi.spi_device_schema())
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)
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async def to_code(config):
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var = cg.new_Pvariable(config[CONF_ID])
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await cg.register_component(var, config)
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await spi.register_spi_device(var, config)
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if CONF_LAMBDA in config:
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lambda_ = await cg.process_lambda(
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config[CONF_LAMBDA], [(ST7920Ref, "it")], return_type=cg.void
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)
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cg.add(var.set_writer(lambda_))
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cg.add(var.set_width(config[CONF_WIDTH]))
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cg.add(var.set_height(config[CONF_HEIGHT]))
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await display.register_display(var, config)
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146
esphome/components/st7920/st7920.cpp
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146
esphome/components/st7920/st7920.cpp
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#include "st7920.h"
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#include "esphome/core/log.h"
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#include "esphome/core/application.h"
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#include "esphome/components/display/display_buffer.h"
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namespace esphome {
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namespace st7920 {
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static const char *const TAG = "st7920";
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// ST7920 COMMANDS
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static const uint8_t LCD_DATA = 0xFA;
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static const uint8_t LCD_COMMAND = 0xF8;
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static const uint8_t LCD_CLS = 0x01;
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static const uint8_t LCD_HOME = 0x02;
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static const uint8_t LCD_ADDRINC = 0x06;
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static const uint8_t LCD_DISPLAYON = 0x0C;
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static const uint8_t LCD_DISPLAYOFF = 0x08;
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static const uint8_t LCD_CURSORON = 0x0E;
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static const uint8_t LCD_CURSORBLINK = 0x0F;
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static const uint8_t LCD_BASIC = 0x30;
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static const uint8_t LCD_GFXMODE = 0x36;
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static const uint8_t LCD_EXTEND = 0x34;
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static const uint8_t LCD_TXTMODE = 0x34;
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static const uint8_t LCD_STANDBY = 0x01;
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static const uint8_t LCD_SCROLL = 0x03;
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static const uint8_t LCD_SCROLLADDR = 0x40;
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static const uint8_t LCD_ADDR = 0x80;
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static const uint8_t LCD_LINE0 = 0x80;
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static const uint8_t LCD_LINE1 = 0x90;
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static const uint8_t LCD_LINE2 = 0x88;
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static const uint8_t LCD_LINE3 = 0x98;
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void ST7920::setup() {
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ESP_LOGCONFIG(TAG, "Setting up ST7920...");
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this->dump_config();
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this->spi_setup();
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this->init_internal_(this->get_buffer_length_());
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display_init_();
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}
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void ST7920::command_(uint8_t value) {
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this->enable();
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this->send_(LCD_COMMAND, value);
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this->disable();
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}
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void ST7920::data_(uint8_t value) {
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this->enable();
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this->send_(LCD_DATA, value);
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this->disable();
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}
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void ST7920::send_(uint8_t type, uint8_t value) {
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this->write_byte(type);
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this->write_byte(value & 0xF0);
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this->write_byte(value << 4);
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}
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void ST7920::goto_xy_(uint16_t x, uint16_t y) {
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if (y >= 32 && y < 64) {
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y -= 32;
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x += 8;
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} else if (y >= 64 && y < 64 + 32) {
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y -= 32;
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x += 0;
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} else if (y >= 64 + 32 && y < 64 + 64) {
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y -= 64;
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x += 8;
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}
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this->command_(LCD_ADDR | y); // 6-bit (0..63)
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this->command_(LCD_ADDR | x); // 4-bit (0..15)
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}
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void HOT ST7920::write_display_data() {
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uint8_t i, j, b;
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for (j = 0; j < this->get_height_internal() / 2; j++) {
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this->goto_xy_(0, j);
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this->enable();
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for (i = 0; i < 16; i++) { // 16 bytes from line #0+
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b = this->buffer_[i + j * 16];
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this->send_(LCD_DATA, b);
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}
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for (i = 0; i < 16; i++) { // 16 bytes from line #32+
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b = this->buffer_[i + (j + 32) * 16];
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this->send_(LCD_DATA, b);
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}
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this->disable();
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App.feed_wdt();
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}
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}
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void ST7920::fill(Color color) { memset(this->buffer_, color.is_on() ? 0xFF : 0x00, this->get_buffer_length_()); }
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void ST7920::dump_config() {
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LOG_DISPLAY("", "ST7920", this);
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LOG_PIN(" CS Pin: ", this->cs_);
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ESP_LOGCONFIG(TAG, " Height: %d", this->height_);
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ESP_LOGCONFIG(TAG, " Width: %d", this->width_);
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}
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float ST7920::get_setup_priority() const { return setup_priority::PROCESSOR; }
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void ST7920::update() {
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this->clear();
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if (this->writer_local_.has_value()) // call lambda function if available
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(*this->writer_local_)(*this);
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this->write_display_data();
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}
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int ST7920::get_width_internal() { return this->width_; }
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int ST7920::get_height_internal() { return this->height_; }
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size_t ST7920::get_buffer_length_() {
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return size_t(this->get_width_internal()) * size_t(this->get_height_internal()) / 8u;
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}
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void HOT ST7920::draw_absolute_pixel_internal(int x, int y, Color color) {
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if (x >= this->get_width_internal() || x < 0 || y >= this->get_height_internal() || y < 0) {
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ESP_LOGW(TAG, "Position out of area: %dx%d", x, y);
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return;
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}
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int width = this->get_width_internal() / 8u;
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if (color.is_on()) {
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this->buffer_[y * width + x / 8] |= (0x80 >> (x & 7));
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} else {
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this->buffer_[y * width + x / 8] &= ~(0x80 >> (x & 7));
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}
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}
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void ST7920::display_init_() {
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ESP_LOGD(TAG, "Initializing display...");
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this->command_(LCD_BASIC); // 8bit mode
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this->command_(LCD_BASIC); // 8bit mode
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this->command_(LCD_CLS); // clear screen
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delay(12); // >10 ms delay
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this->command_(LCD_ADDRINC); // cursor increment right no shift
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this->command_(LCD_DISPLAYON); // D=1, C=0, B=0
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this->command_(LCD_EXTEND); // LCD_EXTEND);
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this->command_(LCD_GFXMODE); // LCD_GFXMODE);
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this->write_display_data();
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}
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} // namespace st7920
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} // namespace esphome
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50
esphome/components/st7920/st7920.h
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50
esphome/components/st7920/st7920.h
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@ -0,0 +1,50 @@
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#pragma once
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#include "esphome/core/component.h"
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#include "esphome/components/display/display_buffer.h"
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#include "esphome/components/spi/spi.h"
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namespace esphome {
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namespace st7920 {
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class ST7920;
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using st7920_writer_t = std::function<void(ST7920 &)>;
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class ST7920 : public PollingComponent,
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public display::DisplayBuffer,
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public spi::SPIDevice<spi::BIT_ORDER_MSB_FIRST, spi::CLOCK_POLARITY_HIGH, spi::CLOCK_PHASE_TRAILING,
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spi::DATA_RATE_1MHZ> {
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public:
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void set_writer(st7920_writer_t &&writer) { this->writer_local_ = writer; }
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void set_height(uint16_t height) { this->height_ = height; }
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void set_width(uint16_t width) { this->width_ = width; }
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// ========== INTERNAL METHODS ==========
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// (In most use cases you won't need these)
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void setup() override;
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void dump_config() override;
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float get_setup_priority() const override;
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void update() override;
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void fill(Color color) override;
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void write_display_data();
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protected:
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void draw_absolute_pixel_internal(int x, int y, Color color) override;
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int get_height_internal() override;
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int get_width_internal() override;
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size_t get_buffer_length_();
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void display_init_();
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void command_(uint8_t value);
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void data_(uint8_t value);
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void send_(uint8_t type, uint8_t value);
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void goto_xy_(uint16_t x, uint16_t y);
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void start_transaction_();
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void end_transaction_();
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int16_t width_ = 128, height_ = 64;
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optional<st7920_writer_t> writer_local_{};
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};
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} // namespace st7920
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} // namespace esphome
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@ -2038,6 +2038,14 @@ display:
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backlight_pin: GPIO4
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lambda: |-
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it.rectangle(0, 0, it.get_width(), it.get_height());
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- platform: st7920
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width: 128
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height: 64
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cs_pin:
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number: GPIO23
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inverted: true
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lambda: |-
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it.rectangle(0, 0, it.get_width(), it.get_height());
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- platform: st7735
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model: 'INITR_BLACKTAB'
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cs_pin: GPIO5
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