EspI2c Class Reference

Class implements I2c interface for ESP32 controllers. More...

#include <esp32_i2c.h>

Public Member Functions
	EspI2c (int8_t busId=-1, uint8_t sa=0x00, int8_t scl=-1, int8_t sda=-1, uint32_t frequency=400000)
	Creates instance of I2C interface for ESP32 controllers. More...
void	begin ()
	Initializes i2c interface.
void	end ()
	Closes i2c interface.
void	start ()
	Starts communication with SSD1306 display.
void	stop ()
	Ends communication with SSD1306 display.
void	send (uint8_t data)
	Sends byte to SSD1306 device. More...
void	sendBuffer (const uint8_t *buffer, uint16_t size)
	Sends bytes to SSD1306 device. More...
void	setAddr (uint8_t addr)
	Sets i2c address for communication This API is required for some led displays having multiple i2c addresses for different types of data. More...

Detailed Description

Class implements I2c interface for ESP32 controllers.

Definition at line 39 of file esp32_i2c.h.

Constructor & Destructor Documentation

EspI2c()

EspI2c::EspI2c ( int8_t  busId = -1, uint8_t  sa = 0x00, int8_t  scl = -1, int8_t  sda = -1, uint32_t  frequency = 400000  )

explicit

Creates instance of I2C interface for ESP32 controllers.

Parameters

busId	bus number to use, -1 defaults to I2C_NUM_1
sa	address to use for oled device (7-bits, highest bit should be 0)
scl	pin number to use as SCL pin, or -1 if default is used
sda	pin number to use as SDA pin, or -1 if default is used
frequency	frequency in HZ to run i2c bus on, defaults to 400kHz

Member Function Documentation

send()

void EspI2c::send

(

uint8_t

data

)

Sends byte to SSD1306 device.

Parameters

data	- byte to send

sendBuffer()

void EspI2c::sendBuffer	(	const uint8_t *	buffer,
		uint16_t	size
	)

Sends bytes to SSD1306 device.

Sends bytes to SSD1306 device. This functions gives ~ 30% performance increase than ssd1306_intf.send.

Parameters

buffer	- bytes to send
size	- number of bytes to send

setAddr()

void EspI2c::setAddr ( uint8_t  addr )

inline

Sets i2c address for communication This API is required for some led displays having multiple i2c addresses for different types of data.

Parameters

addr	i2c address to set (7 bits)

Definition at line 98 of file esp32_i2c.h.

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The documentation for this class was generated from the following file:

• src/lcd_hal/esp/esp32_i2c.h