mbxxx I2C driver.
This patch add the I2C driver for mbxxx platform to communicate with devices connected to the SC2 I2C bus. Signed-off-by: Maria Laura Stefanizzi <laura28582@gmail.com>
This commit is contained in:
Maria Laura Stefanizzi
parent
c99a76747c
commit
c7b1248aac
3 changed files with 191 additions and 1 deletions
|
|
@ -1,4 +1,4 @@
|
|||
ARCH= irq.c sensors.c acc-sensor.c button-sensor.c temperature-sensor.c mems.c contact-sensor.c
|
||||
ARCH= irq.c sensors.c acc-sensor.c button-sensor.c temperature-sensor.c mems.c contact-sensor.c i2c.c
|
||||
|
||||
|
||||
CONTIKI_TARGET_DIRS = . dev
|
||||
|
|
|
|||
136
platform/mbxxx/dev/i2c.c
Normal file
136
platform/mbxxx/dev/i2c.c
Normal file
|
|
@ -0,0 +1,136 @@
|
|||
/*
|
||||
* Copyright (c) 2013, IDentification Automation Laboratory
|
||||
* IDALab (http://www.idalab.unisalento.it)
|
||||
* Department of Innovation Engineering - University of Salento
|
||||
*
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. Neither the name of the Institute nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
/**
|
||||
* \file i2c.c
|
||||
* \brief I2C bus master driver for mbxxx platform.
|
||||
* \author Maria Laura Stefanizzi <laura28582@gmail.com>
|
||||
* \date 2013-11-20
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
#include <contiki.h>
|
||||
#include "dev/i2c.h"
|
||||
#include PLATFORM_HEADER
|
||||
|
||||
#define WAIT_FIN_SC2(FLAG) while(!SC2_STAT(FLAG)) {}
|
||||
|
||||
/**
|
||||
* Configure serial controller in I2C mode and set I2C speed.
|
||||
*/
|
||||
void
|
||||
i2c_enable(void)
|
||||
{
|
||||
/* Configure serial controller to I2C mode */
|
||||
SC2_MODE = SC2_MODE_I2C;
|
||||
|
||||
/*
|
||||
* The SCL is produced by dividing down 12MHz according to
|
||||
* this equation:
|
||||
* Rate = 12 MHz / ( (LIN + 1) * (2^EXP) )
|
||||
*
|
||||
* Configure rate registers for Fast Mode operation (400 kbps)
|
||||
*/
|
||||
SC2_RATELIN = 14;
|
||||
SC2_RATEEXP = 1;
|
||||
|
||||
/* Reset control registers */
|
||||
SC2_TWICTRL1 = SC2_TWICTRL1_RESET;
|
||||
SC2_TWICTRL2 = SC2_TWICTRL2_RESET;
|
||||
}
|
||||
|
||||
/**
|
||||
* Configure serial controller in disabled mode
|
||||
*/
|
||||
void
|
||||
i2c_disable(void)
|
||||
{
|
||||
SC2_MODE = SC2_MODE_DISABLED;
|
||||
}
|
||||
|
||||
/**
|
||||
* Generate I2C START condition
|
||||
*/
|
||||
void
|
||||
i2c_start(void)
|
||||
{
|
||||
SC2_TWICTRL1 |= SC_TWISTART;
|
||||
WAIT_FIN_SC2(SC_TWICMDFIN);
|
||||
}
|
||||
|
||||
/**
|
||||
* Generate I2C STOP condition
|
||||
*/
|
||||
void
|
||||
i2c_stop(void)
|
||||
{
|
||||
SC2_TWICTRL1 |= SC_TWISTOP;
|
||||
WAIT_FIN_SC2(SC_TWICMDFIN);
|
||||
}
|
||||
|
||||
/**
|
||||
* Send a byte to I2C bus
|
||||
* @param data The data that must be sent
|
||||
*/
|
||||
void
|
||||
i2c_write(uint8_t data)
|
||||
{
|
||||
SC2_DATA = data;
|
||||
|
||||
/* Configure control register 1 for byte transmission */
|
||||
SC2_TWICTRL1 |= SC_TWISEND;
|
||||
WAIT_FIN_SC2(SC_TWITXFIN);
|
||||
}
|
||||
|
||||
/**
|
||||
* Read a byte from I2C bus
|
||||
* @param ack If true enable ACK generation after byte reception
|
||||
* @return The received byte
|
||||
*/
|
||||
uint8_t
|
||||
i2c_read(int ack)
|
||||
{
|
||||
if(ack) {
|
||||
/* Enable ACK generation after current received byte */
|
||||
SC2_TWICTRL2 |= SC_TWIACK;
|
||||
} else {
|
||||
/* Disable ACK generation */
|
||||
SC2_TWICTRL2 &= ~SC_TWIACK;
|
||||
}
|
||||
|
||||
/* Configure control register 1 for byte reception */
|
||||
SC2_TWICTRL1 |= SC_TWIRECV;
|
||||
WAIT_FIN_SC2(SC_TWIRXFIN);
|
||||
|
||||
return SC2_DATA;
|
||||
}
|
||||
54
platform/mbxxx/dev/i2c.h
Normal file
54
platform/mbxxx/dev/i2c.h
Normal file
|
|
@ -0,0 +1,54 @@
|
|||
/*
|
||||
* Copyright (c) 2013, IDentification Automation Laboratory
|
||||
* IDALab (http://www.idalab.unisalento.it)
|
||||
* Department of Innovation Engineering - University of Salento
|
||||
*
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. Neither the name of the Institute nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
/**
|
||||
* \file i2c.h
|
||||
* \brief I2C bus master driver for mbxxx platform.
|
||||
* \author Maria Laura Stefanizzi <laura28582@gmail.com>
|
||||
* \date 2013-11-20
|
||||
*/
|
||||
#ifndef I2C_H
|
||||
#define I2C_H
|
||||
|
||||
#define SC2_STAT(FLAG) (SC2_TWISTAT & FLAG)
|
||||
|
||||
void i2c_enable(void);
|
||||
void i2c_disable(void);
|
||||
void i2c_start(void);
|
||||
void i2c_stop(void);
|
||||
|
||||
void i2c_write(uint8_t data);
|
||||
uint8_t i2c_read(int ack);
|
||||
|
||||
#endif /* I2C_H */
|
||||
|
||||
Loading…
Reference in a new issue