52 lines
2 KiB
C
52 lines
2 KiB
C
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/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 Johan Kanflo (github.com/kanflo)
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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 <stdint.h>
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#include <stdbool.h>
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// Init bitbanging I2C driver on given pins
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void i2c_init(uint8_t scl_pin, uint8_t sda_pin);
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// Write a byte to I2C bus. Return true if slave acked.
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bool i2c_write(uint8_t byte);
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// Read a byte from I2C bus. Return true if slave acked.
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uint8_t i2c_read(bool ack);
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// Write 'len' bytes from 'buf' to slave. Return true if slave acked.
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bool i2c_slave_write(uint8_t slave_addr, uint8_t *buf, uint8_t len);
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// Issue a read operation and send 'data', followed by reading 'len' bytes
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// from slave into 'buf'. Return true if slave acked.
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bool i2c_slave_read(uint8_t slave_addr, uint8_t data, uint8_t *buf, uint32_t len);
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// Send start and stop conditions. Only needed when implementing protocols for
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// devices where the i2c_slave_[read|write] functions above are of no use.
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void i2c_start(void);
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void i2c_stop(void);
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