i2cdev.h

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2018 Ruslan V. Uss <[email protected]>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
 
#ifndef __I2CDEV_H__
#define __I2CDEV_H__
 
#include <driver/i2c.h>
#include <freertos/FreeRTOS.h>
#include <freertos/semphr.h>
#include <esp_err.h>
#include <esp_idf_lib_helpers.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#if HELPER_TARGET_IS_ESP8266
#define I2CDEV_MAX_STRETCH_TIME 0xffffffff
#else
#include <soc/i2c_reg.h>
#ifdef I2C_TIME_OUT_REG_V
#define I2CDEV_MAX_STRETCH_TIME I2C_TIME_OUT_REG_V
#else
#define I2CDEV_MAX_STRETCH_TIME 0x00ffffff
#endif
#endif
 
extern SemaphoreHandle_t mutex;
 
typedef struct
{
    i2c_port_t port;         
    i2c_config_t cfg;        
    uint8_t addr;            
    SemaphoreHandle_t mutex; 
    uint32_t timeout_ticks;  
} i2c_dev_t;
 
esp_err_t i2cdev_init();
 
esp_err_t i2cdev_done();
 
esp_err_t i2c_dev_create_mutex(i2c_dev_t *dev);
 
esp_err_t i2c_dev_delete_mutex(i2c_dev_t *dev);
 
esp_err_t i2c_dev_take_mutex(i2c_dev_t *dev);
 
esp_err_t i2c_dev_give_mutex(i2c_dev_t *dev);
 
esp_err_t i2c_dev_read(const i2c_dev_t *dev, const void *out_data,
        size_t out_size, void *in_data, size_t in_size);
 
esp_err_t i2c_dev_write(const i2c_dev_t *dev, const void *out_reg,
        size_t out_reg_size, const void *out_data, size_t out_size);
 
esp_err_t i2c_dev_read_reg(const i2c_dev_t *dev, uint8_t reg,
        void *in_data, size_t in_size);
 
esp_err_t i2c_dev_write_reg(const i2c_dev_t *dev, uint8_t reg,
        const void *out_data, size_t out_size);
 
#define I2C_DEV_TAKE_MUTEX(dev) do { \
        esp_err_t __ = i2c_dev_take_mutex(dev); \
        if (__ != ESP_OK) return __;\
    } while (0)
 
#define I2C_DEV_GIVE_MUTEX(dev) do { \
        esp_err_t __ = i2c_dev_give_mutex(dev); \
        if (__ != ESP_OK) return __;\
    } while (0)
 
#define I2C_DEV_CHECK(dev, X) do { \
        esp_err_t ___ = X; \
        if (___ != ESP_OK) { \
            I2C_DEV_GIVE_MUTEX(dev); \
            return ___; \
        } \
    } while (0)
 
#define I2C_DEV_CHECK_LOGE(dev, X, msg, ...) do { \
        esp_err_t ___ = X; \
        if (___ != ESP_OK) { \
            I2C_DEV_GIVE_MUTEX(dev); \
            ESP_LOGE(TAG, msg, ## __VA_ARGS__); \
            return ___; \
        } \
    } while (0)
 
#ifdef __cplusplus
}
#endif
 
#endif /* __I2CDEV_H__ */