102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 Lilian Marazano (github.com/Zaltora)
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* Based on Baoshi i2c library <mail(at)ba0sh1(dot)com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef __I2C_H__
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#define __I2C_H__
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#endif
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#include <esp8266.h>
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#include <espressif/esp_misc.h> // sdk_os_delay_us
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#include <stdint.h>
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#include <stdbool.h>
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//#define _DELAY sdk_os_delay_us(1) // can up to 300kHz max
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#define _DELAY for (volatile uint32_t __j = 3; __j > 0; __j--) // can up to 1.9MHz max at 160MHz clock
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// if you want use an other API for GPIO or use GPIO16, change here
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#define _SDA1 gpio_write(_sda_pin, 1)
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#define _SDA0 gpio_write(_sda_pin, 0)
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#define _SCL1 gpio_write(_scl_pin, 1)
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#define _SCL0 gpio_write(_scl_pin, 0)
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#define _SDAX gpio_read(_sda_pin)
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#define _SCLX gpio_read(_scl_pin)
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/**
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* @brief Init I2C bus
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* @param scl_pin SCL pin number
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* @param sda_pin SDA pin number
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*/
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void i2c_init(uint8_t scl_pin, uint8_t sda_pin) ;
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/**
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* @brief Send data to I2C bus
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* @param data Data to send
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* @return true if ACK is received at end of sending. False if not ACK'ed
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*/
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uint8_t i2c_write(uint8_t data);
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/**
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* @brief Read data from I2C bus
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* @param ack ACK (true) or NACK (false)
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* @return Data read
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*/
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uint8_t i2c_read(uint8_t ack);
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/**
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* @brief Send I2C start bit
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* @return true if start successfully. Otherwise the bus is busy
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*/
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uint8_t i2c_start(void);
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/**
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* @brief Send I2C stop bit
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*/
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void i2c_stop(void);
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/**
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* @brief Write multiple bytes to a device.
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* @param slave_addr I2C slave device address
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* @param buf Buffer to copy new data from
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* @param len Number of bytes to write
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* @return Status of operation (true = success)
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*/
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bool i2c_slave_write(uint8_t slave_addr, uint8_t *buf, uint16_t len);
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/**
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* @brief Read multiple bytes from a device register.
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* @param slave_addr I2C slave device address
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* @param data First register to read from
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* @param buf Buffer to store read data in
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* @param len Number of bytes to read
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* @return Status of read operation (true = success)
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*/
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bool i2c_slave_read(uint8_t slave_addr, uint8_t data, uint8_t *buf, uint16_t len);
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