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Alex B.
2025-10-07 00:18:25 -04:00
parent 970e081f64
commit 909dddeb77
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358
ESP32-IDF_Temperture-Node-v2/managed_components/espressif__i2c_bus/include/i2c_bus.h
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/*
* SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef _I2C_BUS_H_
#define _I2C_BUS_H_
#include "esp_idf_version.h"
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 3, 0)
#if CONFIG_I2C_BUS_BACKWARD_CONFIG
#include "driver/i2c.h"
#else
#include "driver/i2c_master.h"
#endif
#else
#include "driver/i2c.h"
#endif
#define NULL_I2C_MEM_ADDR 0xFF /*!< set mem_address to NULL_I2C_MEM_ADDR if i2c device has no internal address during read/write */
#define NULL_I2C_MEM_16BIT_ADDR 0XFFFF /*!< set 16bit mem_address to NULL_I2C_MEM_16BIT_ADDR if i2c device has no internal address during read/write */
#define NULL_I2C_DEV_ADDR 0xFF /*!< invalid i2c device address */
typedef void *i2c_bus_handle_t; /*!< i2c bus handle */
typedef void *i2c_bus_device_handle_t; /*!< i2c device handle */
#ifdef __cplusplus
extern "C"
{
#endif
#if CONFIG_I2C_BUS_SUPPORT_SOFTWARE
typedef enum {
I2C_NUM_SW_0 = I2C_NUM_MAX + 1,
#if CONFIG_I2C_BUS_SOFTWARE_MAX_PORT >= 2
I2C_NUM_SW_1,
#endif
#if CONFIG_I2C_BUS_SOFTWARE_MAX_PORT >= 3
I2C_NUM_SW_2,
#endif
#if CONFIG_I2C_BUS_SOFTWARE_MAX_PORT >= 4
I2C_NUM_SW_3,
#endif
#if CONFIG_I2C_BUS_SOFTWARE_MAX_PORT >= 5
I2C_NUM_SW_4,
#endif
I2C_NUM_SW_MAX,
} i2c_sw_port_t;
#endif
#if (ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 0, 0))
#define gpio_pad_select_gpio esp_rom_gpio_pad_select_gpio
#define portTICK_RATE_MS portTICK_PERIOD_MS
#endif
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 3, 0)
#if !CONFIG_I2C_BUS_BACKWARD_CONFIG
/**
* @brief I2C initialization parameters
*/
typedef struct {
i2c_mode_t mode; /*!< I2C mode */
int sda_io_num; /*!< GPIO number for I2C sda signal */
int scl_io_num; /*!< GPIO number for I2C scl signal */
bool sda_pullup_en; /*!< Internal GPIO pull mode for I2C sda signal*/
bool scl_pullup_en; /*!< Internal GPIO pull mode for I2C scl signal*/
struct {
uint32_t clk_speed; /*!< I2C clock frequency for master mode, (no higher than 1MHz for now) */
} master; /*!< I2C master config */
uint32_t clk_flags; /*!< Bitwise of ``I2C_SCLK_SRC_FLAG_**FOR_DFS**`` for clk source choice*/
} i2c_config_t;
#endif
typedef void *i2c_cmd_handle_t; /*!< I2C command handle */
#endif
/**************************************** Public Functions (Application level)*********************************************/
/**
* @brief Create an I2C bus instance then return a handle if created successfully. Each I2C bus works in a singleton mode,
* which means for an i2c port only one group parameter works. When i2c_bus_create is called more than one time for the
* same i2c port, following parameter will override the previous one.
*
* @param port I2C port number. Please note that enabling I2C_BUS_SUPPORT_SOFTWARE in menuconfig allows you to use ports in i2c_sw_port_t to enable software I2C.
* @param conf Pointer to I2C bus configuration
* @return i2c_bus_handle_t Return the I2C bus handle if created successfully, return NULL if failed.
*/
i2c_bus_handle_t i2c_bus_create(i2c_port_t port, const i2c_config_t *conf);
/**
* @brief Delete and release the I2C bus resource.
*
* @param p_bus_handle Point to the I2C bus handle, if delete succeed handle will set to NULL.
* @return
* - ESP_OK Success
* - ESP_FAIL Fail
*/
esp_err_t i2c_bus_delete(i2c_bus_handle_t *p_bus_handle);
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 3, 0)
#if !CONFIG_I2C_BUS_BACKWARD_CONFIG
/**
* @brief Get internal idf bus_handle from i2c_bus_handle
*
* @param bus_handle I2C bus handle
* @return i2c_master_bus_handle_t Return the idf bus_handle if obtained successfully, return NULL if failed.
*/
i2c_master_bus_handle_t i2c_bus_get_internal_bus_handle(i2c_bus_handle_t bus_handle);
#endif
#endif
/**
* @brief Scan i2c devices attached on i2c bus
*
* @param bus_handle I2C bus handle
* @param buf Pointer to a buffer to save devices' address, if NULL no address will be saved.
* @param num Maximum number of addresses to save, invalid if buf set to NULL,
* higher addresses will be discarded if num less-than the total number found on the I2C bus.
* @return uint8_t Total number of devices found on the I2C bus
*/
uint8_t i2c_bus_scan(i2c_bus_handle_t bus_handle, uint8_t *buf, uint8_t num);
/**
* @brief Get current active clock speed.
*
* @param bus_handle I2C bus handle
* @return uint32_t current clock speed
*/
uint32_t i2c_bus_get_current_clk_speed(i2c_bus_handle_t bus_handle);
/**
* @brief Get created device number of the bus.
*
* @param bus_handle I2C bus handle
* @return uint8_t created device number of the bus
*/
uint8_t i2c_bus_get_created_device_num(i2c_bus_handle_t bus_handle);
/**
* @brief Create an I2C device on specific bus.
* Dynamic configuration must be enable to achieve multiple devices with different configs on a single bus.
* menuconfig:Bus Options->I2C Bus Options->enable dynamic configuration
*
* @param bus_handle Point to the I2C bus handle
* @param dev_addr i2c device address
* @param clk_speed device specified clock frequency the i2c_bus will switch to during each transfer. 0 if use current bus speed.
* @return i2c_bus_device_handle_t return a device handle if created successfully, return NULL if failed.
*/
i2c_bus_device_handle_t i2c_bus_device_create(i2c_bus_handle_t bus_handle, uint8_t dev_addr, uint32_t clk_speed);
/**
* @brief Delete and release the I2C device resource, i2c_bus_device_delete should be used in pairs with i2c_bus_device_create.
*
* @param p_dev_handle Point to the I2C device handle, if delete succeed handle will set to NULL.
* @return
* - ESP_OK Success
* - ESP_FAIL Fail
*/
esp_err_t i2c_bus_device_delete(i2c_bus_device_handle_t *p_dev_handle);
/**
* @brief Get device's I2C address
*
* @param dev_handle I2C device handle
* @return uint8_t I2C address, return NULL_I2C_DEV_ADDR if dev_handle is invalid.
*/
uint8_t i2c_bus_device_get_address(i2c_bus_device_handle_t dev_handle);
/**
* @brief Read single byte from i2c device with 8-bit internal register/memory address
*
* @param dev_handle I2C device handle
* @param mem_address The internal reg/mem address to read from, set to NULL_I2C_MEM_ADDR if no internal address.
* @param data Pointer to a buffer to save the data that was read
* @return esp_err_t
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Sending command error, slave doesn't ACK the transfer.
* - ESP_ERR_INVALID_STATE I2C driver not installed or not in master mode.
* - ESP_ERR_TIMEOUT Operation timeout because the bus is busy.
*/
esp_err_t i2c_bus_read_byte(i2c_bus_device_handle_t dev_handle, uint8_t mem_address, uint8_t *data);
/**
* @brief Read multiple bytes from i2c device with 8-bit internal register/memory address.
* If internal reg/mem address is 16-bit, please refer i2c_bus_read_reg16
*
* @param dev_handle I2C device handle
* @param mem_address The internal reg/mem address to read from, set to NULL_I2C_MEM_ADDR if no internal address.
* @param data_len Number of bytes to read
* @param data Pointer to a buffer to save the data that was read
* @return esp_err_t
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Sending command error, slave doesn't ACK the transfer.
* - ESP_ERR_INVALID_STATE I2C driver not installed or not in master mode.
* - ESP_ERR_TIMEOUT Operation timeout because the bus is busy.
*/
esp_err_t i2c_bus_read_bytes(i2c_bus_device_handle_t dev_handle, uint8_t mem_address, size_t data_len, uint8_t *data);
/**
* @brief Read single bit of a byte from i2c device with 8-bit internal register/memory address
*
* @param dev_handle I2C device handle
* @param mem_address The internal reg/mem address to read from, set to NULL_I2C_MEM_ADDR if no internal address.
* @param bit_num The bit number 0 - 7 to read
* @param data Pointer to a buffer to save the data that was read. *data == 0 -> bit = 0, *data !=0 -> bit = 1.
* @return esp_err_t
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Sending command error, slave doesn't ACK the transfer.
* - ESP_ERR_INVALID_STATE I2C driver not installed or not in master mode.
* - ESP_ERR_TIMEOUT Operation timeout because the bus is busy.
*/
esp_err_t i2c_bus_read_bit(i2c_bus_device_handle_t dev_handle, uint8_t mem_address, uint8_t bit_num, uint8_t *data);
/**
* @brief Read multiple bits of a byte from i2c device with 8-bit internal register/memory address
*
* @param dev_handle I2C device handle
* @param mem_address The internal reg/mem address to read from, set to NULL_I2C_MEM_ADDR if no internal address.
* @param bit_start The bit to start from, 0 - 7, MSB at 0
* @param length The number of bits to read, 1 - 8
* @param data Pointer to a buffer to save the data that was read
* @return esp_err_t
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Sending command error, slave doesn't ACK the transfer.
* - ESP_ERR_INVALID_STATE I2C driver not installed or not in master mode.
* - ESP_ERR_TIMEOUT Operation timeout because the bus is busy.
*/
esp_err_t i2c_bus_read_bits(i2c_bus_device_handle_t dev_handle, uint8_t mem_address, uint8_t bit_start, uint8_t length, uint8_t *data);
/**
* @brief Write single byte to i2c device with 8-bit internal register/memory address
*
* @param dev_handle I2C device handle
* @param mem_address The internal reg/mem address to write to, set to NULL_I2C_MEM_ADDR if no internal address.
* @param data The byte to write.
* @return esp_err_t
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Sending command error, slave doesn't ACK the transfer.
* - ESP_ERR_INVALID_STATE I2C driver not installed or not in master mode.
* - ESP_ERR_TIMEOUT Operation timeout because the bus is busy.
*/
esp_err_t i2c_bus_write_byte(i2c_bus_device_handle_t dev_handle, uint8_t mem_address, uint8_t data);
/**
* @brief Write multiple byte to i2c device with 8-bit internal register/memory address
* If internal reg/mem address is 16-bit, please refer i2c_bus_write_reg16
*
* @param dev_handle I2C device handle
* @param mem_address The internal reg/mem address to write to, set to NULL_I2C_MEM_ADDR if no internal address.
* @param data_len Number of bytes to write
* @param data Pointer to the bytes to write.
* @return esp_err_t
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Sending command error, slave doesn't ACK the transfer.
* - ESP_ERR_INVALID_STATE I2C driver not installed or not in master mode.
* - ESP_ERR_TIMEOUT Operation timeout because the bus is busy.
*/
esp_err_t i2c_bus_write_bytes(i2c_bus_device_handle_t dev_handle, uint8_t mem_address, size_t data_len, const uint8_t *data);
/**
* @brief Write single bit of a byte to an i2c device with 8-bit internal register/memory address
*
* @param dev_handle I2C device handle
* @param mem_address The internal reg/mem address to write to, set to NULL_I2C_MEM_ADDR if no internal address.
* @param bit_num The bit number 0 - 7 to write
* @param data The bit to write, data == 0 means set bit = 0, data !=0 means set bit = 1.
* @return esp_err_t
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Sending command error, slave doesn't ACK the transfer.
* - ESP_ERR_INVALID_STATE I2C driver not installed or not in master mode.
* - ESP_ERR_TIMEOUT Operation timeout because the bus is busy.
*/
esp_err_t i2c_bus_write_bit(i2c_bus_device_handle_t dev_handle, uint8_t mem_address, uint8_t bit_num, uint8_t data);
/**
* @brief Write multiple bits of a byte to an i2c device with 8-bit internal register/memory address
*
* @param dev_handle I2C device handle
* @param mem_address The internal reg/mem address to write to, set to NULL_I2C_MEM_ADDR if no internal address.
* @param bit_start The bit to start from, 0 - 7, MSB at 0
* @param length The number of bits to write, 1 - 8
* @param data The bits to write.
* @return esp_err_t
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Sending command error, slave doesn't ACK the transfer.
* - ESP_ERR_INVALID_STATE I2C driver not installed or not in master mode.
* - ESP_ERR_TIMEOUT Operation timeout because the bus is busy.
*/
esp_err_t i2c_bus_write_bits(i2c_bus_device_handle_t dev_handle, uint8_t mem_address, uint8_t bit_start, uint8_t length, uint8_t data);
/**************************************** Public Functions (Low level)*********************************************/
/**
* @brief I2C master send queued commands create by ``i2c_cmd_link_create`` .
* This function will trigger sending all queued commands.
* The task will be blocked until all the commands have been sent out.
* If I2C_BUS_DYNAMIC_CONFIG enable, i2c_bus will dynamically check configs and re-install i2c driver before each transfer,
* hence multiple devices with different configs on a single bus can be supported.
* @note
* Only call this function when ``i2c_bus_read/write_xx`` do not meet the requirements
*
* @param dev_handle I2C device handle
* @param cmd I2C command handler
* @return esp_err_t
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Sending command error, slave doesn't ACK the transfer.
* - ESP_ERR_INVALID_STATE I2C driver not installed or not in master mode.
* - ESP_ERR_TIMEOUT Operation timeout because the bus is busy.
*/
esp_err_t i2c_bus_cmd_begin(i2c_bus_device_handle_t dev_handle, i2c_cmd_handle_t cmd);
/**
* @brief Write date to an i2c device with 16-bit internal reg/mem address
*
* @param dev_handle I2C device handle
* @param mem_address The internal 16-bit reg/mem address to write to, set to NULL_I2C_MEM_ADDR if no internal address.
* @param data_len Number of bytes to write
* @param data Pointer to the bytes to write.
* @return esp_err_t
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Sending command error, slave doesn't ACK the transfer.
* - ESP_ERR_INVALID_STATE I2C driver not installed or not in master mode.
* - ESP_ERR_TIMEOUT Operation timeout because the bus is busy.
*/
esp_err_t i2c_bus_write_reg16(i2c_bus_device_handle_t dev_handle, uint16_t mem_address, size_t data_len, const uint8_t *data);
/**
* @brief Read date from i2c device with 16-bit internal reg/mem address
*
* @param dev_handle I2C device handle
* @param mem_address The internal 16-bit reg/mem address to read from, set to NULL_I2C_MEM_ADDR if no internal address.
* @param data_len Number of bytes to read
* @param data Pointer to a buffer to save the data that was read
* @return esp_err_t
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Sending command error, slave doesn't ACK the transfer.
* - ESP_ERR_INVALID_STATE I2C driver not installed or not in master mode.
* - ESP_ERR_TIMEOUT Operation timeout because the bus is busy.
*/
esp_err_t i2c_bus_read_reg16(i2c_bus_device_handle_t dev_handle, uint16_t mem_address, size_t data_len, uint8_t *data);
#ifdef __cplusplus
}
#endif
#endif