TCA9535Keypad.cpp File Reference

#include "cdc_hal/IKeypad.h"
#include "cdc_hal/II2cBus.h"
#include "cdc_hal/hw_config.h"
#include "cdc_core/SystemLock.h"
#include "cdc_log.h"
#include "esp_attr.h"
#include "esp_heap_caps.h"
#include "driver/gpio.h"
#include "freertos/FreeRTOS.h"
#include "freertos/idf_additions.h"
#include "freertos/task.h"
#include "freertos/semphr.h"

Go to the source code of this file.

Classes
class	cdc::hal::TCA9535Keypad

Namespaces
namespace	cdc
namespace	cdc::hal

Functions
static constexpr uint16_t	cdc::hal::maskForBit (uint8_t bit)
	Builds the active-low raw state for a single pressed key.
static Key	cdc::hal::rawToKey (uint16_t raw)
	Converts raw 16-bit keypad state to a Key enum value.
static uint16_t	cdc::hal::keyToMask (Key key)
	Converts a Key enum value to its expected raw 12-bit mask.
IKeypad *	cdc::hal::getKeypadInstance ()
	Returns the singleton keypad service instance.

Variables
static const char *	TAG = "Keypad"
static constexpr uint8_t	cdc::hal::REG_INPUT_0 = 0x00
	TCA9535 register-address constants.
static constexpr uint8_t	cdc::hal::REG_INPUT_1 = 0x01
static constexpr uint8_t	cdc::hal::REG_OUTPUT_0 = 0x02
static constexpr uint8_t	cdc::hal::REG_OUTPUT_1 = 0x03
static constexpr uint8_t	cdc::hal::REG_POLARITY_0 = 0x04
static constexpr uint8_t	cdc::hal::REG_POLARITY_1 = 0x05
static constexpr uint8_t	cdc::hal::REG_CONFIG_0 = 0x06
static constexpr uint8_t	cdc::hal::REG_CONFIG_1 = 0x07
static constexpr uint32_t	cdc::hal::TASK_STACK_SIZE = 6144
	Keypad task scheduling configuration.
static constexpr UBaseType_t	cdc::hal::TASK_PRIORITY = 5
static constexpr uint32_t	cdc::hal::POLL_TIMEOUT_MS = 50
static constexpr uint32_t	cdc::hal::DEBOUNCE_MS = 10
static constexpr uint32_t	cdc::hal::LONG_PRESS_THRESHOLD_MS = 800
	Default long-press detection threshold in milliseconds. Long enough to avoid accidental triggers, short enough to feel responsive.
static constexpr size_t	cdc::hal::KEY_BUFFER_SIZE = 16
	Ring-buffer configuration for queued key events.
static constexpr uint8_t	cdc::hal::KEY_BIT_0 = 0
	Bit positions of each physical key on the TCA9535 P0/P1 ports. Active-low: a pressed key drives its corresponding bit to 0.
static constexpr uint8_t	cdc::hal::KEY_BIT_1 = 1
static constexpr uint8_t	cdc::hal::KEY_BIT_2 = 2
static constexpr uint8_t	cdc::hal::KEY_BIT_3 = 3
static constexpr uint8_t	cdc::hal::KEY_BIT_4 = 4
static constexpr uint8_t	cdc::hal::KEY_BIT_5 = 5
static constexpr uint8_t	cdc::hal::KEY_BIT_6 = 6
static constexpr uint8_t	cdc::hal::KEY_BIT_7 = 7
static constexpr uint8_t	cdc::hal::KEY_BIT_8 = 8
static constexpr uint8_t	cdc::hal::KEY_BIT_9 = 9
static constexpr uint8_t	cdc::hal::KEY_BIT_NO = 11
static constexpr uint8_t	cdc::hal::KEY_BIT_YES = 10
static constexpr uint16_t	cdc::hal::KEY_MASK_ALL = 0x0FFF
	Mask of all 12 keypad bits (P0.0..P1.3).
static constexpr uint16_t	cdc::hal::KEY_STATE_IDLE = KEY_MASK_ALL
	Idle state: every key released, all 12 bits high.
static constexpr uint16_t	cdc::hal::KEY_STATE_INVALID = 0xFFFF
	Sentinel value returned when an I2C read fails or no key is mapped.
static constexpr uint16_t	cdc::hal::PANIC_CHORD_BITS = (1u << KEY_BIT_NO) | (1u << KEY_BIT_YES)
	Reserved rescue chord: N and Y held together (anti-block instant lock).
static TCA9535Keypad	cdc::hal::g_keypad
	Singleton keypad instance.

Variable Documentation

TAG

const char* TAG = "Keypad"

static

TCA9535 I/O Expander - 12-Key Keypad HAL Implementation Interrupt-driven with FreeRTOS task and circular buffer

Definition at line 19 of file TCA9535Keypad.cpp.