114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; 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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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2005 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \brief I2C generic driver functions (implementation).
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*
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* \author Francesco Sacchi <batt@develer.com>
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*/
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#include "i2c.h"
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#include "cfg/cfg_i2c.h"
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#if !CONFIG_I2C_DISABLE_OLD_API
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I2c local_i2c_old_api;
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/**
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* Send a sequence of bytes in master transmitter mode
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* to the selected slave device through the I2C bus.
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*
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* \return true on success, false on error.
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*/
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bool i2c_send(const void *_buf, size_t count)
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{
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const uint8_t *buf = (const uint8_t *)_buf;
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while (count--)
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{
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if (!i2c_put(*buf++))
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return false;
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}
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return true;
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}
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/**
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* Receive a sequence of one or more bytes from the
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* selected slave device in master receive mode through
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* the I2C bus.
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*
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* Received data is placed in \c buf.
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*
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* \note a NACK is automatically given on the last received
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* byte.
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*
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* \return true on success, false on error
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*/
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bool i2c_recv(void *_buf, size_t count)
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{
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uint8_t *buf = (uint8_t *)_buf;
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while (count--)
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{
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/*
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* The last byte read does not has an ACK
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* to stop communication.
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*/
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int c = i2c_get(count);
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if (c == EOF)
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return false;
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else
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*buf++ = c;
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}
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return true;
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}
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#endif /* !CONFIG_I2C_DISABLE_OLD_API */
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void i2c_genericWrite(struct I2c *i2c, const void *_buf, size_t count)
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{
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const uint8_t *buf = (const uint8_t *)_buf;
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while (count--)
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i2c_putc(i2c, *buf++);
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}
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void i2c_genericRead(struct I2c *i2c, void *_buf, size_t count)
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{
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uint8_t *buf = (uint8_t *)_buf;
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while (count--)
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*buf++ = i2c_getc(i2c);
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}
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