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30a542e763
* Add backlight handling for lcd_pcf8574 Switch the backlight on or off by calling id(mydisplay).backlight() or id(mydisplay).no_backlight() in lamda functions (assuming mydisplay is the custom id for the LCD). * Use abstract method Co-authored-by: Attila Darazs <attila@darazs.com> Co-authored-by: Otto Winter <otto@otto-winter.com>
58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
#include "pcf8574_display.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace lcd_pcf8574 {
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static const char *TAG = "lcd_pcf8574";
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static const uint8_t LCD_DISPLAY_BACKLIGHT_ON = 0x08;
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static const uint8_t LCD_DISPLAY_BACKLIGHT_OFF = 0x00;
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void PCF8574LCDDisplay::setup() {
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ESP_LOGCONFIG(TAG, "Setting up PCF8574 LCD Display...");
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this->backlight_value_ = LCD_DISPLAY_BACKLIGHT_ON;
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if (!this->write_bytes(this->backlight_value_, nullptr, 0)) {
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this->mark_failed();
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return;
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}
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LCDDisplay::setup();
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}
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void PCF8574LCDDisplay::dump_config() {
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ESP_LOGCONFIG(TAG, "PCF8574 LCD Display:");
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ESP_LOGCONFIG(TAG, " Columns: %u, Rows: %u", this->columns_, this->rows_);
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LOG_I2C_DEVICE(this);
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LOG_UPDATE_INTERVAL(this);
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if (this->is_failed()) {
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ESP_LOGE(TAG, "Communication with LCD Display failed!");
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}
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}
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void PCF8574LCDDisplay::write_n_bits(uint8_t value, uint8_t n) {
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if (n == 4) {
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// Ugly fix: in the super setup() with n == 4 value needs to be shifted left
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value <<= 4;
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}
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uint8_t data = value | this->backlight_value_; // Set backlight state
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this->write_bytes(data, nullptr, 0);
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// Pulse ENABLE
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this->write_bytes(data | 0x04, nullptr, 0);
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delayMicroseconds(1); // >450ns
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this->write_bytes(data, nullptr, 0);
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delayMicroseconds(100); // >37us
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}
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void PCF8574LCDDisplay::send(uint8_t value, bool rs) {
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this->write_n_bits((value & 0xF0) | rs, 0);
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this->write_n_bits(((value << 4) & 0xF0) | rs, 0);
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}
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void PCF8574LCDDisplay::backlight() {
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this->backlight_value_ = LCD_DISPLAY_BACKLIGHT_ON;
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this->write_bytes(this->backlight_value_, nullptr, 0);
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}
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void PCF8574LCDDisplay::no_backlight() {
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this->backlight_value_ = LCD_DISPLAY_BACKLIGHT_OFF;
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this->write_bytes(this->backlight_value_, nullptr, 0);
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}
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} // namespace lcd_pcf8574
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} // namespace esphome
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