Add Pca9554 component (#4192)

esphome/components/pca9554/pca9554.cpp

@@ -0,0 +1,112 @@
+#include "pca9554.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace pca9554 {
+
+const uint8_t INPUT_REG = 0;
+const uint8_t OUTPUT_REG = 1;
+const uint8_t INVERT_REG = 2;
+const uint8_t CONFIG_REG = 3;
+
+static const char *const TAG = "pca9554";
+
+void PCA9554Component::setup() {
+  ESP_LOGCONFIG(TAG, "Setting up PCA9554/PCA9554A...");
+  // Test to see if device exists
+  if (!this->read_inputs_()) {
+    ESP_LOGE(TAG, "PCA9554 not available under 0x%02X", this->address_);
+    this->mark_failed();
+    return;
+  }
+
+  // No polarity inversion
+  this->write_register_(INVERT_REG, 0);
+  // All inputs at initialization
+  this->config_mask_ = 0;
+  // Invert mask as the part sees a 1 as an input
+  this->write_register_(CONFIG_REG, ~this->config_mask_);
+  // All ouputs low
+  this->output_mask_ = 0;
+  this->write_register_(OUTPUT_REG, this->output_mask_);
+  // Read the inputs
+  this->read_inputs_();
+  ESP_LOGD(TAG, "Initialization complete. Warning: %d, Error: %d", this->status_has_warning(),
+           this->status_has_error());
+}
+void PCA9554Component::dump_config() {
+  ESP_LOGCONFIG(TAG, "PCA9554:");
+  LOG_I2C_DEVICE(this)
+  if (this->is_failed()) {
+    ESP_LOGE(TAG, "Communication with PCA9554 failed!");
+  }
+}
+
+bool PCA9554Component::digital_read(uint8_t pin) {
+  this->read_inputs_();
+  return this->input_mask_ & (1 << pin);
+}
+
+void PCA9554Component::digital_write(uint8_t pin, bool value) {
+  if (value) {
+    this->output_mask_ |= (1 << pin);
+  } else {
+    this->output_mask_ &= ~(1 << pin);
+  }
+  this->write_register_(OUTPUT_REG, this->output_mask_);
+}
+
+void PCA9554Component::pin_mode(uint8_t pin, gpio::Flags flags) {
+  if (flags == gpio::FLAG_INPUT) {
+    // Clear mode mask bit
+    this->config_mask_ &= ~(1 << pin);
+  } else if (flags == gpio::FLAG_OUTPUT) {
+    // Set mode mask bit
+    this->config_mask_ |= 1 << pin;
+  }
+  this->write_register_(CONFIG_REG, ~this->config_mask_);
+}
+
+bool PCA9554Component::read_inputs_() {
+  uint8_t inputs;
+
+  if (this->is_failed()) {
+    ESP_LOGD(TAG, "Device marked failed");
+    return false;
+  }
+
+  if ((this->last_error_ = this->read_register(INPUT_REG, &inputs, 1, true)) != esphome::i2c::ERROR_OK) {
+    this->status_set_warning();
+    ESP_LOGE(TAG, "read_register_(): I2C I/O error: %d", (int) this->last_error_);
+    return false;
+  }
+  this->status_clear_warning();
+  this->input_mask_ = inputs;
+  return true;
+}
+
+bool PCA9554Component::write_register_(uint8_t reg, uint8_t value) {
+  if ((this->last_error_ = this->write_register(reg, &value, 1, true)) != esphome::i2c::ERROR_OK) {
+    this->status_set_warning();
+    ESP_LOGE(TAG, "write_register_(): I2C I/O error: %d", (int) this->last_error_);
+    return false;
+  }
+
+  this->status_clear_warning();
+  return true;
+}
+
+float PCA9554Component::get_setup_priority() const { return setup_priority::IO; }
+
+void PCA9554GPIOPin::setup() { pin_mode(flags_); }
+void PCA9554GPIOPin::pin_mode(gpio::Flags flags) { this->parent_->pin_mode(this->pin_, flags); }
+bool PCA9554GPIOPin::digital_read() { return this->parent_->digital_read(this->pin_) != this->inverted_; }
+void PCA9554GPIOPin::digital_write(bool value) { this->parent_->digital_write(this->pin_, value != this->inverted_); }
+std::string PCA9554GPIOPin::dump_summary() const {
+  char buffer[32];
+  snprintf(buffer, sizeof(buffer), "%u via PCA9554", pin_);
+  return buffer;
+}
+
+}  // namespace pca9554
+}  // namespace esphome