lcd_i2c.h File Reference

#include <stdio.h>
#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "driver/i2c_master.h"

Go to the source code of this file.

Macros
#define	I2C_MASTER_SCL_IO   GPIO_NUM_2
#define	I2C_MASTER_SDA_IO   GPIO_NUM_3
#define	I2C_MASTER_NUM   I2C_NUM_0
#define	I2C_MASTER_FREQ_HZ   100000
#define	I2C_MASTER_TX_BUF_DISABLE   0
#define	I2C_MASTER_RX_BUF_DISABLE   0
#define	I2C_MASTER_TIMEOUT_MS   1000
#define	I2C_DEVICE_ADDRESS_LEN   I2C_ADDR_BIT_LEN_7

Functions
uint8_t	i2c_open (i2c_master_bus_handle_t *bus_handle, i2c_master_dev_handle_t *dev_handle, const uint8_t address)
	initializes the i2c communications and points the handles to correctly initialized variables on the heap.

Macro Definition Documentation

I2C_DEVICE_ADDRESS_LEN

#define I2C_DEVICE_ADDRESS_LEN   I2C_ADDR_BIT_LEN_7

Definition at line 22 of file lcd_i2c.h.

I2C_MASTER_FREQ_HZ

#define I2C_MASTER_FREQ_HZ   100000

I2C master clock frequency

Definition at line 18 of file lcd_i2c.h.

I2C_MASTER_NUM

#define I2C_MASTER_NUM   I2C_NUM_0

I2C port number for master dev

Definition at line 17 of file lcd_i2c.h.

I2C_MASTER_RX_BUF_DISABLE

#define I2C_MASTER_RX_BUF_DISABLE   0

I2C master doesn't need buffer

Definition at line 20 of file lcd_i2c.h.

I2C_MASTER_SCL_IO

#define I2C_MASTER_SCL_IO   GPIO_NUM_2

GPIO number used for I2C master clock

Definition at line 15 of file lcd_i2c.h.

I2C_MASTER_SDA_IO

#define I2C_MASTER_SDA_IO   GPIO_NUM_3

GPIO number used for I2C master data

Definition at line 16 of file lcd_i2c.h.

I2C_MASTER_TIMEOUT_MS

#define I2C_MASTER_TIMEOUT_MS   1000

Definition at line 21 of file lcd_i2c.h.

I2C_MASTER_TX_BUF_DISABLE

#define I2C_MASTER_TX_BUF_DISABLE   0

I2C master doesn't need buffer

Definition at line 19 of file lcd_i2c.h.

Function Documentation

i2c_open()

uint8_t i2c_open	(	i2c_master_bus_handle_t *	bus_handle,
		i2c_master_dev_handle_t *	dev_handle,
		const uint8_t	address )

initializes the i2c communications and points the handles to correctly initialized variables on the heap.

Parameters

[out]	bus_handle	handle for initializing the bus
[out]	dev_handle	handle for initializing the device on bus
[in]	address	device address on bus to communicate with

Definition at line 3 of file lcd_i2c.c.

                                                                                                                  {
    i2c_master_bus_config_t bus_config = {
        .i2c_port = I2C_MASTER_NUM,
        .sda_io_num = I2C_MASTER_SDA_IO,
        .scl_io_num = I2C_MASTER_SCL_IO,
        .clk_source = I2C_CLK_SRC_DEFAULT,
        .glitch_ignore_cnt = 7,
        .flags.enable_internal_pullup = true,
    };
    ESP_ERROR_CHECK(i2c_new_master_bus(&bus_config, bus_handle));
 
    i2c_device_config_t dev_config = {
        .dev_addr_length = I2C_DEVICE_ADDRESS_LEN,
        .device_address = address,
        .scl_speed_hz = I2C_MASTER_FREQ_HZ,
    };
    ESP_ERROR_CHECK(i2c_master_bus_add_device(*bus_handle, &dev_config, dev_handle));
 
    return 0;
}