contiki/cpu/cc2538/dev/i2c.h

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/*
* Copyright (c) 2015, Mehdi Migault
* 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 copyright holder 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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.
*/
/**
* \addtogroup cc2538
* @{
*
* \defgroup cc2538-i2c cc2538 I2C Control
*
* cc2538 I2C Control Module
* @{
*
* \file
* Header file with declarations for the I2C Control module
*
* \author
* Mehdi Migault
*/
#ifndef I2C_H_
#define I2C_H_
#include "reg.h"
#include "sys-ctrl.h"
#include "gpio.h"
#include "ioc.h"
#include <stdio.h> /* For debug */
#include "clock.h" /* For temporisation */
/*---------------------------------------------------------------------------*/
/** \name I2C Master commands
* @{
*/
#define I2C_MASTER_CMD_SINGLE_SEND 0x00000007
#define I2C_MASTER_CMD_SINGLE_RECEIVE 0x00000007
#define I2C_MASTER_CMD_BURST_SEND_START 0x00000003
#define I2C_MASTER_CMD_BURST_SEND_CONT 0x00000001
#define I2C_MASTER_CMD_BURST_SEND_FINISH 0x00000005
#define I2C_MASTER_CMD_BURST_SEND_ERROR_STOP 0x00000004
#define I2C_MASTER_CMD_BURST_RECEIVE_START 0x0000000b
#define I2C_MASTER_CMD_BURST_RECEIVE_CONT 0x00000009
#define I2C_MASTER_CMD_BURST_RECEIVE_FINISH 0x00000005
#define I2C_MASTER_CMD_BURST_RECEIVE_ERROR_STOP 0x00000004
/** @} */
/*---------------------------------------------------------------------------*/
/** \name I2C Master status flags
* @{
*/
#define I2C_MASTER_ERR_NONE 0
#define I2CM_STAT_BUSY 0x00000001
#define I2CM_STAT_ERROR 0x00000002
#define I2CM_STAT_ADRACK 0x00000004
#define I2CM_STAT_DATACK 0x00000008
#define I2CM_STAT_ARBLST 0x00000010
#define I2CM_STAT_IDLE 0x00000020
#define I2CM_STAT_BUSBSY 0x00000040
#define I2CM_STAT_INVALID 0x00000080
/** @} */
/*---------------------------------------------------------------------------*/
/** \name I2C registers
* @{
*/
#define I2CM_CR 0x40020020 /* I2C master config */
#define I2CM_TPR 0x4002000C /* I2C master timer period */
#define I2CM_SA 0x40020000 /* I2C master slave address */
#define I2CM_DR 0x40020008 /* I2C master data */
#define I2CM_CTRL 0x40020004 /* Master control in write */
#define I2CM_STAT I2CM_CTRL /* Master status in read */
/** @} */
/*---------------------------------------------------------------------------*/
/** \name I2C Miscellaneous
* @{
*/
#define I2C_SCL_NORMAL_BUS_SPEED 100000 /* 100KHz I2C */
#define I2C_SCL_FAST_BUS_SPEED 400000 /* 400KHz I2C */
#define I2C_RECEIVE 0x01 /* Master receive */
#define I2C_SEND 0x00 /* Master send */
/** @} */
/*---------------------------------------------------------------------------*/
/**
* \name I2C Functions
* @{
*/
/**
* \brief Initialize the I2C peripheral and pins
* \param port_sda The GPIO number of the pin used fort SDA
* \param pin_sda The pin number used for SDA
* \param port_scl The GPIO number of the pin used fort SCL
* \param pin_scl The pin number used for SCL
* \param bus_speed The clock frequency used by I2C module
*
* \e bus_speed can take the following values:
*
* - I2C_SCL_NORMAL_BUS_SPEED : 100KHz
* - I2C_SCL_FAST_BUS_SPEED : 400KHz
*/
void i2c_init(uint8_t port_sda, uint8_t pin_sda, uint8_t port_scl,
uint8_t pin_scl, uint32_t bus_speed);
/** \brief Enable master I2C module */
void i2c_master_enable(void);
/** \brief Disable master I2C module */
void i2c_master_disable(void);
/**
* \brief Initialize I2C peripheral clock with given frequency
* \param freq The desired frequency
*
* \e freq can take the following values:
*
* - I2C_SCL_NORMAL_BUS_SPEED : 100KHz
* - I2C_SCL_FAST_BUS_SPEED : 400KHz
*/
void i2c_set_frequency(uint32_t freq);
/**
* \brief Set the address of slave and access mode for the next I2C communication
* \param slave_addr The receiver slave address on 7 bits
* \param access_mode The I2C access mode (send/receive)
*
* \e access_mode can take the following values:
*
* - I2C_RECEIVE : 1
* - I2C_SEND : 0
*/
void i2c_master_set_slave_address(uint8_t slave_addr, uint8_t access_mode);
/**
* \brief Prepare data to be transmitted
* \param data The byte of data to be transmitted from the I2C master
*/
void i2c_master_data_put(uint8_t data);
/**
* \brief Return received data from I2C
* \return The byte received by I2C after à receive command
*/
uint8_t i2c_master_data_get(void);
/**
* \brief Control the state of the master module for send and receive operations
* \param cmd The operation to perform
*
* \e cmd can take the following values:
*
* - I2C_MASTER_CMD_SINGLE_SEND
* - I2C_MASTER_CMD_SINGLE_RECEIVE
* - I2C_MASTER_CMD_BURST_SEND_START
* - I2C_MASTER_CMD_BURST_SEND_CONT
* - I2C_MASTER_CMD_BURST_SEND_FINISH
* - I2C_MASTER_CMD_BURST_SEND_ERROR_STOP
* - I2C_MASTER_CMD_BURST_RECEIVE_START
* - I2C_MASTER_CMD_BURST_RECEIVE_CONT
* - I2C_MASTER_CMD_BURST_RECEIVE_FINISH
* - I2C_MASTER_CMD_BURST_RECEIVE_ERROR_STOP
*/
void i2c_master_command(uint8_t cmd);
/**
* \brief Return the busy state of I2C module
* \retval 0 The I2C module is not busy
* \retval 1 The I2C module is busy
*/
uint8_t i2c_master_busy(void);
/**
* \brief Return the status register if error occurred during last communication
* \retval I2C_MASTER_ERR_NONE Return 0 if no error occurred
*
* If an error occurred, return the status register of the I2C module.
* Use the result with the I2CM_STAT_* flags to custom your processing
*/
uint8_t i2c_master_error(void);
/**
* \brief Perform all operations to send a byte to a slave
* \param slave_addr The adress of the slave to which data are sent
* \param data The data to send to the slave
* \return Return the value of i2c_master_error() after the I2C operation
*/
uint8_t i2c_single_send(uint8_t slave_addr, uint8_t data);
/**
* \brief Perform all operations to receive a byte from a slave
* \param slave_addr The address of the slave from which data are received
* \param data A pointer to store the received data
* \return Return the value of i2c_master_error() after the I2C operation
*/
uint8_t i2c_single_receive(uint8_t slave_addr, uint8_t *data);
/**
* \brief Perform all operations to send multiple bytes to a slave
* \param slave_addr The address of the slave to which data are sent
* \param data A pointer to the data to send to the slave
* \param len Number of bytes to send
* \return Return the value of i2c_master_error() after the I2C operation
*/
uint8_t i2c_burst_send(uint8_t slave_addr, uint8_t *data, uint8_t len);
/**
* \brief Perform all operations to receive multiple bytes from a slave
* \param slave_addr The address of the slave from which data are received
* \param data A pointer to store the received data
* \param len Number of bytes to receive
* \return Return the value of i2c_master_error() after the I2C operation
*/
uint8_t i2c_burst_receive(uint8_t slave_addr, uint8_t *data, uint8_t len);
/** @} */
#endif /* I2C_H_ */
/**
* @}
* @}
*/