240 lines
8.3 KiB
C
240 lines
8.3 KiB
C
/*
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* Copyright (c) 2015, Mehdi Migault
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup cc2538
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* @{
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*
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* \defgroup cc2538-i2c cc2538 I2C Control
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*
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* cc2538 I2C Control Module
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* @{
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*
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* \file
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* Header file with declarations for the I2C Control module
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*
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* \author
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* Mehdi Migault
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*/
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#ifndef I2C_H_
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#define I2C_H_
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#include "reg.h"
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#include "sys-ctrl.h"
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#include "gpio.h"
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#include "ioc.h"
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#include <stdio.h> /* For debug */
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#include "clock.h" /* For temporisation */
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/*---------------------------------------------------------------------------*/
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/** \name I2C Master commands
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* @{
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*/
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#define I2C_MASTER_CMD_SINGLE_SEND 0x00000007
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#define I2C_MASTER_CMD_SINGLE_RECEIVE 0x00000007
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#define I2C_MASTER_CMD_BURST_SEND_START 0x00000003
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#define I2C_MASTER_CMD_BURST_SEND_CONT 0x00000001
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#define I2C_MASTER_CMD_BURST_SEND_FINISH 0x00000005
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#define I2C_MASTER_CMD_BURST_SEND_ERROR_STOP 0x00000004
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#define I2C_MASTER_CMD_BURST_RECEIVE_START 0x0000000b
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#define I2C_MASTER_CMD_BURST_RECEIVE_CONT 0x00000009
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#define I2C_MASTER_CMD_BURST_RECEIVE_FINISH 0x00000005
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#define I2C_MASTER_CMD_BURST_RECEIVE_ERROR_STOP 0x00000004
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/** @} */
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/*---------------------------------------------------------------------------*/
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/** \name I2C Master status flags
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* @{
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*/
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#define I2C_MASTER_ERR_NONE 0
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#define I2CM_STAT_BUSY 0x00000001
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#define I2CM_STAT_ERROR 0x00000002
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#define I2CM_STAT_ADRACK 0x00000004
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#define I2CM_STAT_DATACK 0x00000008
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#define I2CM_STAT_ARBLST 0x00000010
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#define I2CM_STAT_IDLE 0x00000020
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#define I2CM_STAT_BUSBSY 0x00000040
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#define I2CM_STAT_INVALID 0x00000080
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/** @} */
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/*---------------------------------------------------------------------------*/
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/** \name I2C registers
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* @{
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*/
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#define I2CM_CR 0x40020020 /* I2C master config */
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#define I2CM_TPR 0x4002000C /* I2C master timer period */
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#define I2CM_SA 0x40020000 /* I2C master slave address */
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#define I2CM_DR 0x40020008 /* I2C master data */
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#define I2CM_CTRL 0x40020004 /* Master control in write */
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#define I2CM_STAT I2CM_CTRL /* Master status in read */
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/** @} */
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/*---------------------------------------------------------------------------*/
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/** \name I2C Miscellaneous
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* @{
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*/
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#define I2C_SCL_NORMAL_BUS_SPEED 100000 /* 100KHz I2C */
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#define I2C_SCL_FAST_BUS_SPEED 400000 /* 400KHz I2C */
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#define I2C_RECEIVE 0x01 /* Master receive */
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#define I2C_SEND 0x00 /* Master send */
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/** @} */
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/*---------------------------------------------------------------------------*/
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/**
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* \name I2C Functions
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* @{
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*/
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/**
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* \brief Initialize the I2C peripheral and pins
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* \param port_sda The GPIO number of the pin used fort SDA
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* \param pin_sda The pin number used for SDA
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* \param port_scl The GPIO number of the pin used fort SCL
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* \param pin_scl The pin number used for SCL
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* \param bus_speed The clock frequency used by I2C module
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*
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* \e bus_speed can take the following values:
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*
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* - I2C_SCL_NORMAL_BUS_SPEED : 100KHz
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* - I2C_SCL_FAST_BUS_SPEED : 400KHz
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*/
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void i2c_init(uint8_t port_sda, uint8_t pin_sda, uint8_t port_scl,
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uint8_t pin_scl, uint32_t bus_speed);
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/** \brief Enable master I2C module */
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void i2c_master_enable(void);
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/** \brief Disable master I2C module */
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void i2c_master_disable(void);
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/**
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* \brief Initialize I2C peripheral clock with given frequency
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* \param freq The desired frequency
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*
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* \e freq can take the following values:
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*
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* - I2C_SCL_NORMAL_BUS_SPEED : 100KHz
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* - I2C_SCL_FAST_BUS_SPEED : 400KHz
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*/
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void i2c_set_frequency(uint32_t freq);
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/**
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* \brief Set the address of slave and access mode for the next I2C communication
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* \param slave_addr The receiver slave address on 7 bits
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* \param access_mode The I2C access mode (send/receive)
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*
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* \e access_mode can take the following values:
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*
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* - I2C_RECEIVE : 1
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* - I2C_SEND : 0
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*/
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void i2c_master_set_slave_address(uint8_t slave_addr, uint8_t access_mode);
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/**
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* \brief Prepare data to be transmitted
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* \param data The byte of data to be transmitted from the I2C master
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*/
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void i2c_master_data_put(uint8_t data);
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/**
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* \brief Return received data from I2C
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* \return The byte received by I2C after à receive command
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*/
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uint8_t i2c_master_data_get(void);
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/**
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* \brief Control the state of the master module for send and receive operations
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* \param cmd The operation to perform
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*
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* \e cmd can take the following values:
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*
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* - I2C_MASTER_CMD_SINGLE_SEND
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* - I2C_MASTER_CMD_SINGLE_RECEIVE
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* - I2C_MASTER_CMD_BURST_SEND_START
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* - I2C_MASTER_CMD_BURST_SEND_CONT
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* - I2C_MASTER_CMD_BURST_SEND_FINISH
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* - I2C_MASTER_CMD_BURST_SEND_ERROR_STOP
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* - I2C_MASTER_CMD_BURST_RECEIVE_START
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* - I2C_MASTER_CMD_BURST_RECEIVE_CONT
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* - I2C_MASTER_CMD_BURST_RECEIVE_FINISH
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* - I2C_MASTER_CMD_BURST_RECEIVE_ERROR_STOP
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*/
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void i2c_master_command(uint8_t cmd);
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/**
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* \brief Return the busy state of I2C module
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* \retval 0 The I2C module is not busy
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* \retval 1 The I2C module is busy
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*/
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uint8_t i2c_master_busy(void);
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/**
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* \brief Return the status register if error occurred during last communication
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* \retval I2C_MASTER_ERR_NONE Return 0 if no error occurred
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*
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* If an error occurred, return the status register of the I2C module.
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* Use the result with the I2CM_STAT_* flags to custom your processing
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*/
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uint8_t i2c_master_error(void);
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/**
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* \brief Perform all operations to send a byte to a slave
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* \param slave_addr The adress of the slave to which data are sent
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* \param data The data to send to the slave
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* \return Return the value of i2c_master_error() after the I2C operation
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*/
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uint8_t i2c_single_send(uint8_t slave_addr, uint8_t data);
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/**
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* \brief Perform all operations to receive a byte from a slave
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* \param slave_addr The address of the slave from which data are received
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* \param data A pointer to store the received data
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* \return Return the value of i2c_master_error() after the I2C operation
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*/
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uint8_t i2c_single_receive(uint8_t slave_addr, uint8_t *data);
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/**
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* \brief Perform all operations to send multiple bytes to a slave
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* \param slave_addr The address of the slave to which data are sent
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* \param data A pointer to the data to send to the slave
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* \param len Number of bytes to send
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* \return Return the value of i2c_master_error() after the I2C operation
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*/
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uint8_t i2c_burst_send(uint8_t slave_addr, uint8_t *data, uint8_t len);
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/**
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* \brief Perform all operations to receive multiple bytes from a slave
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* \param slave_addr The address of the slave from which data are received
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* \param data A pointer to store the received data
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* \param len Number of bytes to receive
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* \return Return the value of i2c_master_error() after the I2C operation
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*/
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uint8_t i2c_burst_receive(uint8_t slave_addr, uint8_t *data, uint8_t len);
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/** @} */
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#endif /* I2C_H_ */
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/**
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* @}
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* @}
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*/
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