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Merge branch 'gpio_expander_fix_more_than_8_pins_in_bank' into optimize_pcf8574

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This commit is contained in:
J. Nick Koston
2025-09-07 17:21:09 -05:00
parent a63927a5f6 7d65acf7db
commit 2d43f31fdb
1 changed files with 15 additions and 10 deletions
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25
esphome/components/gpio_expander/cached_gpio.h
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@@ -4,6 +4,7 @@
#include <cstdint>
#include <cstring>
#include <limits>
#include <type_traits>
#include "esphome/core/hal.h"
namespace esphome::gpio_expander {
@@ -20,14 +21,18 @@ namespace esphome::gpio_expander {
/// Examples: MCP23017 (2x8-bit banks), TCA9555 (2x8-bit banks)
/// * uint16_t: For chips that read all pins at once (up to 16 pins)
/// Examples: PCF8574/8575 (8/16 pins), PCA9554/9555 (8/16 pins)
/// N - Total number of pins (as uint8_t)
template<typename T, uint8_t N> class CachedGpioExpander {
/// N - Total number of pins (maximum 65535)
/// P - Type for pin number parameters (automatically selected based on N:
/// uint8_t for N<=256, uint16_t for N>256). Can be explicitly specified
/// if needed (e.g., for components like SN74HC165 with >256 pins)
template<typename T, uint16_t N, typename P = typename std::conditional<(N > 256), uint16_t, uint8_t>::type>
class CachedGpioExpander {
public:
/// @brief Read the state of the given pin. This will invalidate the cache for the given pin number.
/// @param pin Pin number to read
/// @return Pin state
bool digital_read(uint8_t pin) {
const uint8_t bank = pin / BANK_SIZE;
bool digital_read(P pin) {
const P bank = pin / BANK_SIZE;
const T pin_mask = (1 << (pin % BANK_SIZE));
// Check if specific pin cache is valid
if (this->read_cache_valid_[bank] & pin_mask) {
@@ -43,7 +48,7 @@ template<typename T, uint8_t N> class CachedGpioExpander {
return this->digital_read_cache(pin);
}
void digital_write(uint8_t pin, bool value) { this->digital_write_hw(pin, value); }
void digital_write(P pin, bool value) { this->digital_write_hw(pin, value); }
protected:
/// @brief Read GPIO bank from hardware into internal state
@@ -51,23 +56,23 @@ template<typename T, uint8_t N> class CachedGpioExpander {
/// @return true if read succeeded, false on communication error
/// @note This does NOT return the pin state. It returns whether the read operation succeeded.
/// The actual pin state should be returned by digital_read_cache().
virtual bool digital_read_hw(uint8_t pin) = 0;
virtual bool digital_read_hw(P pin) = 0;
/// @brief Get cached pin value from internal state
/// @param pin Pin number to read
/// @return Pin state (true = HIGH, false = LOW)
virtual bool digital_read_cache(uint8_t pin) = 0;
virtual bool digital_read_cache(P pin) = 0;
/// @brief Write GPIO state to hardware
/// @param pin Pin number to write
/// @param value Pin state to write (true = HIGH, false = LOW)
virtual void digital_write_hw(uint8_t pin, bool value) = 0;
virtual void digital_write_hw(P pin, bool value) = 0;
/// @brief Invalidate cache. This function should be called in component loop().
void reset_pin_cache_() { memset(this->read_cache_valid_, 0x00, CACHE_SIZE_BYTES); }
static constexpr uint8_t BITS_PER_BYTE = 8;
static constexpr uint8_t BANK_SIZE = sizeof(T) * BITS_PER_BYTE;
static constexpr uint16_t BITS_PER_BYTE = 8;
static constexpr uint16_t BANK_SIZE = sizeof(T) * BITS_PER_BYTE;
static constexpr size_t BANKS = N / BANK_SIZE;
static constexpr size_t CACHE_SIZE_BYTES = BANKS * sizeof(T);