134 lines
4.4 KiB
C++
134 lines
4.4 KiB
C++
#include "pcf8574.h"
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#include "esphome/core/log.h"
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namespace esphome::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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if (this->interrupt_pin_ != nullptr) {
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this->interrupt_pin_->setup();
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this->interrupt_pin_->attach_interrupt(&PCF8574Component::gpio_intr, this, gpio::INTERRUPT_FALLING_EDGE);
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// Don't invalidate cache on read — only invalidate when interrupt fires
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this->set_invalidate_on_read_(false);
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}
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// Disable loop until an input pin is configured via pin_mode()
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// For interrupt-driven mode, loop is re-enabled by the ISR
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// For polling mode, loop is re-enabled when pin_mode() registers an input pin
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this->disable_loop();
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}
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void IRAM_ATTR PCF8574Component::gpio_intr(PCF8574Component *arg) { arg->enable_loop_soon_any_context(); }
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void PCF8574Component::loop() {
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// Invalidate the cache so the next digital_read() triggers a fresh I2C read
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this->reset_pin_cache_();
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// Only disable the loop once INT has actually gone HIGH. Input transitions that straddle the
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// I2C read leave INT asserted without re-firing a falling edge, which would strand us with
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// stale state forever; keep looping until the line is released so we self-heal.
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if (this->interrupt_pin_ != nullptr && this->interrupt_pin_->digital_read()) {
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this->disable_loop();
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}
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}
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void PCF8574Component::dump_config() {
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ESP_LOGCONFIG(TAG,
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"PCF8574:\n"
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" Is PCF8575: %s",
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YESNO(this->pcf8575_));
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LOG_PIN(" Interrupt Pin: ", this->interrupt_pin_);
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LOG_I2C_DEVICE(this)
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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_hw(uint8_t pin) {
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// Read all pins from hardware into input_mask_
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return this->read_gpio_(); // Return true if I2C read succeeded, false on error
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}
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bool PCF8574Component::digital_read_cache(uint8_t pin) { return this->input_mask_ & (1 << pin); }
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void PCF8574Component::digital_write_hw(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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// Enable polling loop for input pins (not needed for interrupt-driven mode
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// where the ISR handles re-enabling loop)
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if (this->interrupt_pin_ == nullptr) {
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this->enable_loop();
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}
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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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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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size_t PCF8574GPIOPin::dump_summary(char *buffer, size_t len) const {
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return buf_append_printf(buffer, len, 0, "%u via PCF8574", this->pin_);
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}
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} // namespace esphome::pcf8574
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