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https://github.com/esphome/esphome.git
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117 lines
3.3 KiB
C++
117 lines
3.3 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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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::loop() {
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// Invalidate the cache at the start of each loop.
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// The actual read will happen on demand in digital_read()
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this->cache_valid_ = false;
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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, ESP_LOG_MSG_COMM_FAIL);
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}
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}
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bool PCF8574Component::digital_read(uint8_t pin) {
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// Read the inputs once per loop on demand and cache the result
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if (!this->cache_valid_ && this->read_gpio_()) {
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this->cache_valid_ = true;
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}
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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, gpio::Flags flags) {
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if (flags == gpio::FLAG_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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} else if (flags == gpio::FLAG_OUTPUT) {
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// Set mode mask bit
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this->mode_mask_ |= 1 << pin;
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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(data, this->pcf8575_ ? 2 : 1) != i2c::ERROR_OK) {
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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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// Run our loop() method early to invalidate cache before any other components access the pins
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float PCF8574Component::get_loop_priority() const { return 9.0f; } // Just after WIFI
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void PCF8574GPIOPin::setup() { pin_mode(flags_); }
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void PCF8574GPIOPin::pin_mode(gpio::Flags flags) { this->parent_->pin_mode(this->pin_, flags); }
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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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std::string PCF8574GPIOPin::dump_summary() const {
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char buffer[32];
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snprintf(buffer, sizeof(buffer), "%u via PCF8574", pin_);
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return buffer;
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}
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} // namespace pcf8574
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} // namespace esphome
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