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pin_manager.h
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#ifndef WLED_PIN_MANAGER_H
#define WLED_PIN_MANAGER_H
/*
* Registers pins so there is no attempt for two interfaces to use the same pin
*/
#include <Arduino.h>
#include "const.h" // for USERMOD_* values
typedef struct PinManagerPinType {
int8_t pin;
bool isOutput;
} managed_pin_type;
/*
* Allows PinManager to "lock" an allocation to a specific
* owner, so someone else doesn't accidentally de-allocate
* a pin it hasn't allocated. Also enhances debugging.
*
* RAM Cost:
* 17 bytes on ESP8266
* 40 bytes on ESP32
*/
enum struct PinOwner : uint8_t {
None = 0, // default == legacy == unspecified owner
// High bit is set for all built-in pin owners
Ethernet = 0x81,
BusDigital = 0x82,
BusDigital2 = 0x83,
BusPwm = 0x84, // 'BusP' == PWM output using BusPwm
Button = 0x85, // 'Butn' == button from configuration
IR = 0x86, // 'IR' == IR receiver pin from configuration
Relay = 0x87, // 'Rly' == Relay pin from configuration
SPI_RAM = 0x88, // 'SpiR' == SPI RAM
DebugOut = 0x89, // 'Dbg' == debug output always IO1
DMX = 0x8A, // 'DMX' == hard-coded to IO2
HW_I2C = 0x8B, // 'I2C' == hardware I2C pins (4&5 on ESP8266, 21&22 on ESP32)
// Use UserMod IDs from const.h here
UM_Unspecified = USERMOD_ID_UNSPECIFIED, // 0x01
UM_Example = USERMOD_ID_EXAMPLE, // 0x02 // Usermod "usermod_v2_example.h"
UM_Temperature = USERMOD_ID_TEMPERATURE, // 0x03 // Usermod "usermod_temperature.h"
// #define USERMOD_ID_FIXNETSERVICES // 0x04 // Usermod "usermod_Fix_unreachable_netservices.h" -- Does not allocate pins
UM_PIR = USERMOD_ID_PIRSWITCH, // 0x05 // Usermod "usermod_PIR_sensor_switch.h"
// #define USERMOD_ID_IMU // 0x06 // Usermod "usermod_mpu6050_imu.h" -- Uses "standard" HW_I2C pins
UM_FourLineDisplay = USERMOD_ID_FOUR_LINE_DISP, // 0x07 // Usermod "usermod_v2_four_line_display.h -- May use "standard" HW_I2C pins
UM_RotaryEncoderUI = USERMOD_ID_ROTARY_ENC_UI, // 0x08 // Usermod "usermod_v2_rotary_encoder_ui.h"
// #define USERMOD_ID_AUTO_SAVE // 0x09 // Usermod "usermod_v2_auto_save.h" -- Does not allocate pins
// #define USERMOD_ID_DHT // 0x0A // Usermod "usermod_dht.h" -- Statically allocates pins, not compatible with pinManager?
// #define USERMOD_ID_MODE_SORT // 0x0B // Usermod "usermod_v2_mode_sort.h" -- Does not allocate pins
// #define USERMOD_ID_VL53L0X // 0x0C // Usermod "usermod_vl53l0x_gestures.h" -- Uses "standard" HW_I2C pins
UM_MultiRelay = USERMOD_ID_MULTI_RELAY, // 0x0D // Usermod "usermod_multi_relay.h"
UM_AnimatedStaircase = USERMOD_ID_ANIMATED_STAIRCASE, // 0x0E // Usermod "Animated_Staircase.h"
// #define USERMOD_ID_RTC // 0x0F // Usermod "usermod_rtc.h" -- Uses "standard" HW_I2C pins
// #define USERMOD_ID_ELEKSTUBE_IPS // 0x10 // Usermod "usermod_elekstube_ips.h" -- Uses quite a few pins ... see Hardware.h and User_Setup.h
// #define USERMOD_ID_SN_PHOTORESISTOR // 0x11 // Usermod "usermod_sn_photoresistor.h" -- Uses hard-coded pin (PHOTORESISTOR_PIN == A0), but could be easily updated to use pinManager
UM_RGBRotaryEncoder = USERMOD_RGB_ROTARY_ENCODER, // 0x16 // Usermod "rgb-rotary-encoder.h"
UM_QuinLEDAnPenta = USERMOD_ID_QUINLED_AN_PENTA // 0x17 // Usermod "quinled-an-penta.h"
};
static_assert(0u == static_cast<uint8_t>(PinOwner::None), "PinOwner::None must be zero, so default array initialization works as expected");
class PinManagerClass {
private:
#ifdef ESP8266
uint8_t pinAlloc[3] = {0x00, 0x00, 0x00}; //24bit, 1 bit per pin, we use first 17bits
PinOwner ownerTag[17] = { PinOwner::None };
#else
uint8_t pinAlloc[5] = {0x00, 0x00, 0x00, 0x00, 0x00}; //40bit, 1 bit per pin, we use all bits
uint8_t ledcAlloc[2] = {0x00, 0x00}; //16 LEDC channels
PinOwner ownerTag[40] = { PinOwner::None };
#endif
uint8_t i2cAllocCount = 0; // allow multiple allocation of I2C bus pins but keep track of allocations
public:
// De-allocates a single pin
bool deallocatePin(byte gpio, PinOwner tag);
// De-allocates multiple pins but only if all can be deallocated (PinOwner has to be specified)
bool deallocateMultiplePins(const uint8_t *pinArray, byte arrayElementCount, PinOwner tag);
// Allocates a single pin, with an owner tag.
// De-allocation requires the same owner tag (or override)
bool allocatePin(byte gpio, bool output, PinOwner tag);
// Allocates all the pins, or allocates none of the pins, with owner tag.
// Provided to simplify error condition handling in clients
// using more than one pin, such as I2C, SPI, rotary encoders,
// ethernet, etc..
bool allocateMultiplePins(const managed_pin_type * mptArray, byte arrayElementCount, PinOwner tag );
#if !defined(ESP8266) // ESP8266 compiler doesn't understand deprecated attribute
[[deprecated("Replaced by three-parameter allocatePin(gpio, output, ownerTag), for improved debugging")]]
#endif
inline bool allocatePin(byte gpio, bool output = true) { return allocatePin(gpio, output, PinOwner::None); }
#if !defined(ESP8266) // ESP8266 compiler doesn't understand deprecated attribute
[[deprecated("Replaced by two-parameter deallocatePin(gpio, ownerTag), for improved debugging")]]
#endif
inline void deallocatePin(byte gpio) { deallocatePin(gpio, PinOwner::None); }
// will return true for reserved pins
bool isPinAllocated(byte gpio, PinOwner tag = PinOwner::None);
// will return false for reserved pins
bool isPinOk(byte gpio, bool output = true);
PinOwner getPinOwner(byte gpio);
#ifdef ARDUINO_ARCH_ESP32
byte allocateLedc(byte channels);
void deallocateLedc(byte pos, byte channels);
#endif
};
extern PinManagerClass pinManager;
#endif