kopia lustrzana https://github.com/espressif/esp-idf
88 wiersze
2.9 KiB
C
88 wiersze
2.9 KiB
C
/*
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* SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <stdbool.h>
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#include "hal/i2c_types.h"
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#include "hal/gpio_types.h"
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#include "esp_err.h"
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/**
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* @brief LP Core I2C pin config parameters
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*/
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typedef struct {
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gpio_num_t sda_io_num; /*!< GPIO pin for SDA signal. Only GPIO#6 can be used as the SDA pin. */
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gpio_num_t scl_io_num; /*!< GPIO pin for SCL signal. Only GPIO#7 can be used as the SCL pin. */
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bool sda_pullup_en; /*!< SDA line enable internal pullup. Can be configured if external pullup is not used. */
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bool scl_pullup_en; /*!< SCL line enable internal pullup. Can be configured if external pullup is not used. */
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} lp_core_i2c_pin_cfg_t;
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/**
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* @brief LP Core I2C timing config parameters
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*/
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typedef struct {
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uint32_t clk_speed_hz; /*!< LP I2C clock speed for master mode */
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} lp_core_i2c_timing_cfg_t;
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/**
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* @brief LP Core I2C config parameters
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*/
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typedef struct {
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lp_core_i2c_pin_cfg_t i2c_pin_cfg; /*!< LP I2C pin configuration */
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lp_core_i2c_timing_cfg_t i2c_timing_cfg; /*!< LP I2C timing configuration */
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soc_periph_lp_i2c_clk_src_t i2c_src_clk; /*!< LP I2C source clock type */
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} lp_core_i2c_cfg_t;
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/* Default LP I2C GPIO settings */
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#define LP_I2C_DEFAULT_GPIO_CONFIG() \
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.i2c_pin_cfg.sda_io_num = GPIO_NUM_6, \
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.i2c_pin_cfg.scl_io_num = GPIO_NUM_7, \
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.i2c_pin_cfg.sda_pullup_en = true, \
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.i2c_pin_cfg.scl_pullup_en = true, \
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/* LP I2C fast mode config. Max SCL freq of 400 KHz. */
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#define LP_I2C_FAST_MODE_CONFIG() \
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.i2c_timing_cfg.clk_speed_hz = 400000, \
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/* LP I2C standard mode config. Max SCL freq of 100 KHz. */
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#define LP_I2C_STANDARD_MODE_CONFIG() \
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.i2c_timing_cfg.clk_speed_hz = 100000, \
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#define LP_I2C_DEFAULT_SRC_CLK() \
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.i2c_src_clk = LP_I2C_SCLK_LP_FAST, \
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/* Default LP I2C GPIO settings and timing parametes */
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#define LP_CORE_I2C_DEFAULT_CONFIG() \
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{ \
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LP_I2C_DEFAULT_GPIO_CONFIG() \
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LP_I2C_FAST_MODE_CONFIG() \
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LP_I2C_DEFAULT_SRC_CLK() \
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}
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/**
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* @brief Initialize and configure the LP I2C for use by the LP core
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* Currently LP I2C can only be used in master mode
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*
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* @param lp_i2c_num LP I2C port number
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* @param cfg Configuration parameters
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* @return esp_err_t ESP_OK when successful
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*
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* @note The internal pull-up resistors for SDA and SCL pins, if enabled, will
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* provide a weak pull-up value of about 30-50 kOhm. Users are adviced to enable
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* external pull-ups for better performance at higher SCL frequencies.
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*/
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esp_err_t lp_core_i2c_master_init(i2c_port_t lp_i2c_num, const lp_core_i2c_cfg_t *cfg);
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#ifdef __cplusplus
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}
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#endif
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