64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/*
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twi.h - Stripped-down TWI/I2C library
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Copyright (c) 2006 Nicholas Zambetti. All right reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#pragma once
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#include <inttypes.h>
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#include <compat/twi.h>
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#ifndef TWI_FREQ
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#define TWI_FREQ 400000L
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#endif
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/*
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* Function twi_init
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* Desc readys twi pins and sets twi bitrate
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* Input none
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* Output none
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*/
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void twi_init(void);
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/*
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* Function twi_disable
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* Desc disables twi pins
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* Input none
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* Output none
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*/
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void twi_disable(void);
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/*
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* Function twi_r8
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* Desc read a single byte from a device
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* Input address: 7bit i2c device address
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* reg: register address
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* data: pointer to byte for result
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* Output 0 on success
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*/
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uint8_t twi_r8(uint8_t address, uint8_t reg, uint8_t* data);
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/*
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* Function twi_w8
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* Desc write a single byte from a device
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* Input address: 7bit i2c device address
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* reg: register address
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* data: byte to write
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* Output 0 on success
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*/
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uint8_t twi_w8(uint8_t address, uint8_t reg, uint8_t data);
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