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[pca6416a] Migrate to CachedGpioExpander to reduce I2C bus usage (#10587)

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This commit is contained in:
J. Nick Koston
2025-09-07 17:59:23 -05:00
committed by GitHub
parent 629f1e94f1
commit 0cc0979674
3 changed files with 33 additions and 10 deletions
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1
esphome/components/pca6416a/__init__.py
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@@ -14,6 +14,7 @@ from esphome.const import (
CODEOWNERS = ["@Mat931"]
DEPENDENCIES = ["i2c"]
AUTO_LOAD = ["gpio_expander"]
MULTI_CONF = True
pca6416a_ns = cg.esphome_ns.namespace("pca6416a")

25
esphome/components/pca6416a/pca6416a.cpp
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@@ -51,6 +51,11 @@ void PCA6416AComponent::setup() {
this->status_has_error());
}
void PCA6416AComponent::loop() {
// Invalidate cache at the start of each loop
this->reset_pin_cache_();
}
void PCA6416AComponent::dump_config() {
if (this->has_pullup_) {
ESP_LOGCONFIG(TAG, "PCAL6416A:");
@@ -63,15 +68,25 @@ void PCA6416AComponent::dump_config() {
}
}
bool PCA6416AComponent::digital_read(uint8_t pin) {
uint8_t bit = pin % 8;
bool PCA6416AComponent::digital_read_hw(uint8_t pin) {
uint8_t reg_addr = pin < 8 ? PCA6416A_INPUT0 : PCA6416A_INPUT1;
uint8_t value = 0;
this->read_register_(reg_addr, &value);
return value & (1 << bit);
if (!this->read_register_(reg_addr, &value)) {
return false;
}
// Update the appropriate part of input_mask_
if (pin < 8) {
this->input_mask_ = (this->input_mask_ & 0xFF00) | value;
} else {
this->input_mask_ = (this->input_mask_ & 0x00FF) | (uint16_t(value) << 8);
}
return true;
}
void PCA6416AComponent::digital_write(uint8_t pin, bool value) {
bool PCA6416AComponent::digital_read_cache(uint8_t pin) { return this->input_mask_ & (1 << pin); }
void PCA6416AComponent::digital_write_hw(uint8_t pin, bool value) {
uint8_t reg_addr = pin < 8 ? PCA6416A_OUTPUT0 : PCA6416A_OUTPUT1;
this->update_register_(pin, value, reg_addr);
}

17
esphome/components/pca6416a/pca6416a.h
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@@ -3,20 +3,20 @@
#include "esphome/core/component.h"
#include "esphome/core/hal.h"
#include "esphome/components/i2c/i2c.h"
#include "esphome/components/gpio_expander/cached_gpio.h"
namespace esphome {
namespace pca6416a {
class PCA6416AComponent : public Component, public i2c::I2CDevice {
class PCA6416AComponent : public Component,
public i2c::I2CDevice,
public gpio_expander::CachedGpioExpander<uint8_t, 16> {
public:
PCA6416AComponent() = default;
/// Check i2c availability and setup masks
void setup() override;
/// Helper function to read the value of a pin.
bool digital_read(uint8_t pin);
/// Helper function to write the value of a pin.
void digital_write(uint8_t pin, bool value);
void loop() override;
/// Helper function to set the pin mode of a pin.
void pin_mode(uint8_t pin, gpio::Flags flags);
@@ -25,6 +25,11 @@ class PCA6416AComponent : public Component, public i2c::I2CDevice {
void dump_config() override;
protected:
// Virtual methods from CachedGpioExpander
bool digital_read_hw(uint8_t pin) override;
bool digital_read_cache(uint8_t pin) override;
void digital_write_hw(uint8_t pin, bool value) override;
bool read_register_(uint8_t reg, uint8_t *value);
bool write_register_(uint8_t reg, uint8_t value);
void update_register_(uint8_t pin, bool pin_value, uint8_t reg_addr);
@@ -32,6 +37,8 @@ class PCA6416AComponent : public Component, public i2c::I2CDevice {
/// The mask to write as output state - 1 means HIGH, 0 means LOW
uint8_t output_0_{0x00};
uint8_t output_1_{0x00};
/// Cache for input values (16-bit combined for both banks)
uint16_t input_mask_{0x00};
/// Storage for last I2C error seen
esphome::i2c::ErrorCode last_error_;
/// Only the PCAL6416A has pull-up resistors