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108 lines
2.9 KiB
C++
108 lines
2.9 KiB
C++
#include "pcf8574.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace pcf8574 {
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static const char *const TAG = "pcf8574";
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void PCF8574Component::setup() {
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ESP_LOGCONFIG(TAG, "Setting up PCF8574...");
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if (!this->read_gpio_()) {
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ESP_LOGE(TAG, "PCF8574 not available under 0x%02X", this->address_);
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this->mark_failed();
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return;
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}
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this->write_gpio_();
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this->read_gpio_();
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}
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void PCF8574Component::dump_config() {
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ESP_LOGCONFIG(TAG, "PCF8574:");
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LOG_I2C_DEVICE(this)
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ESP_LOGCONFIG(TAG, " Is PCF8575: %s", YESNO(this->pcf8575_));
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if (this->is_failed()) {
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ESP_LOGE(TAG, "Communication with PCF8574 failed!");
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}
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}
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bool PCF8574Component::digital_read(uint8_t pin) {
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this->read_gpio_();
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return this->input_mask_ & (1 << pin);
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}
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void PCF8574Component::digital_write(uint8_t pin, bool value) {
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if (value) {
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this->output_mask_ |= (1 << pin);
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} else {
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this->output_mask_ &= ~(1 << pin);
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}
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this->write_gpio_();
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}
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void PCF8574Component::pin_mode(uint8_t pin, uint8_t mode) {
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switch (mode) {
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case PCF8574_INPUT:
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// Clear mode mask bit
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this->mode_mask_ &= ~(1 << pin);
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// Write GPIO to enable input mode
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this->write_gpio_();
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break;
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case PCF8574_OUTPUT:
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// Set mode mask bit
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this->mode_mask_ |= 1 << pin;
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break;
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default:
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break;
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}
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}
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bool PCF8574Component::read_gpio_() {
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if (this->is_failed())
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return false;
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bool success;
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uint8_t data[2];
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if (this->pcf8575_) {
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success = this->read_bytes_raw(data, 2);
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this->input_mask_ = (uint16_t(data[1]) << 8) | (uint16_t(data[0]) << 0);
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} else {
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success = this->read_bytes_raw(data, 1);
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this->input_mask_ = data[0];
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}
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if (!success) {
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this->status_set_warning();
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return false;
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}
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this->status_clear_warning();
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return true;
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}
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bool PCF8574Component::write_gpio_() {
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if (this->is_failed())
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return false;
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uint16_t value = 0;
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// Pins in OUTPUT mode and where pin is HIGH.
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value |= this->mode_mask_ & this->output_mask_;
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// Pins in INPUT mode must also be set here
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value |= ~this->mode_mask_;
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uint8_t data[2];
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data[0] = value;
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data[1] = value >> 8;
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if (!this->write_bytes_raw(data, this->pcf8575_ ? 2 : 1)) {
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this->status_set_warning();
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return false;
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}
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this->status_clear_warning();
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return true;
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}
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float PCF8574Component::get_setup_priority() const { return setup_priority::IO; }
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void PCF8574GPIOPin::setup() { this->pin_mode(this->mode_); }
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bool PCF8574GPIOPin::digital_read() { return this->parent_->digital_read(this->pin_) != this->inverted_; }
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void PCF8574GPIOPin::digital_write(bool value) { this->parent_->digital_write(this->pin_, value != this->inverted_); }
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void PCF8574GPIOPin::pin_mode(uint8_t mode) { this->parent_->pin_mode(this->pin_, mode); }
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PCF8574GPIOPin::PCF8574GPIOPin(PCF8574Component *parent, uint8_t pin, uint8_t mode, bool inverted)
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: GPIOPin(pin, mode, inverted), parent_(parent) {}
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} // namespace pcf8574
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} // namespace esphome
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