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[mcp23016] Migrate to CachedGpioExpander to reduce I2C bus usage

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This commit is contained in:
J. Nick Koston
2025-09-04 14:02:31 -05:00
parent c7ee727af4
commit 053415a22e
3 changed files with 32 additions and 10 deletions
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1
esphome/components/mcp23016/__init__.py
View File

@@ -11,6 +11,7 @@ from esphome.const import (
CONF_OUTPUT,
)
AUTO_LOAD = ["gpio_expander"]
DEPENDENCIES = ["i2c"]
MULTI_CONF = True

27
esphome/components/mcp23016/mcp23016.cpp
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@@ -22,14 +22,29 @@ void MCP23016::setup() {
this->write_reg_(MCP23016_IODIR0, 0xFF);
this->write_reg_(MCP23016_IODIR1, 0xFF);
}
bool MCP23016::digital_read(uint8_t pin) {
uint8_t bit = pin % 8;
void MCP23016::loop() {
// Invalidate cache at the start of each loop
this->reset_pin_cache_();
}
bool MCP23016::digital_read_hw(uint8_t pin) {
uint8_t reg_addr = pin < 8 ? MCP23016_GP0 : MCP23016_GP1;
uint8_t value = 0;
this->read_reg_(reg_addr, &value);
return value & (1 << bit);
if (!this->read_reg_(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 MCP23016::digital_write(uint8_t pin, bool value) {
bool MCP23016::digital_read_cache(uint8_t pin) { return this->input_mask_ & (1 << pin); }
void MCP23016::digital_write_hw(uint8_t pin, bool value) {
uint8_t reg_addr = pin < 8 ? MCP23016_OLAT0 : MCP23016_OLAT1;
this->update_reg_(pin, value, reg_addr);
}
@@ -41,7 +56,7 @@ void MCP23016::pin_mode(uint8_t pin, gpio::Flags flags) {
this->update_reg_(pin, false, iodir);
}
}
float MCP23016::get_setup_priority() const { return setup_priority::HARDWARE; }
float MCP23016::get_setup_priority() const { return setup_priority::IO; }
bool MCP23016::read_reg_(uint8_t reg, uint8_t *value) {
if (this->is_failed())
return false;

14
esphome/components/mcp23016/mcp23016.h
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@@ -3,6 +3,7 @@
#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 mcp23016 {
@@ -24,19 +25,22 @@ enum MCP23016GPIORegisters {
MCP23016_IOCON1 = 0x0B,
};
class MCP23016 : public Component, public i2c::I2CDevice {
class MCP23016 : public Component, public i2c::I2CDevice, public gpio_expander::CachedGpioExpander<uint8_t, 16> {
public:
MCP23016() = default;
void setup() override;
bool digital_read(uint8_t pin);
void digital_write(uint8_t pin, bool value);
void loop() override;
void pin_mode(uint8_t pin, gpio::Flags flags);
float get_setup_priority() const 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;
// read a given register
bool read_reg_(uint8_t reg, uint8_t *value);
// write a value to a given register
@@ -46,6 +50,8 @@ class MCP23016 : public Component, public i2c::I2CDevice {
uint8_t olat_0_{0x00};
uint8_t olat_1_{0x00};
// Cache for input values (16-bit combined for both banks)
uint16_t input_mask_{0x00};
};
class MCP23016GPIOPin : public GPIOPin {