+++ /dev/null
-/*
- * Copyright (c) 2009 Communication Group and Eislab at
- * Lulea University of Technology
- *
- * Contact: Laurynas Riliskis, LTU
- * Mail: laurynas.riliskis@ltu.se
- * All rights reserved.
- *
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * - 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.
- * - Neither the name of Communication Group at Lulea University of Technology
- * 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 STANFORD
- * UNIVERSITY OR ITS 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.
- */
-
-/*
- * Copyright (c) 2006 Stanford University.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * - 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.
- * - Neither the name of the Stanford University 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 STANFORD
- * UNIVERSITY OR ITS 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.
- *
- * @author Philip Levis
- */
-
-/**
- * This driver implements an software I2C Master controller.
- *
- * @author Henrik Makitaavola <henrik.makitaavola@gmail.com>
- */
-#include "I2C.h"
-generic module SoftI2CMasterPacketP()
-{
- provides interface AsyncStdControl;
- provides interface I2CPacket<TI2CBasicAddr>;
-
- uses interface SoftI2CBus as I2C;
-}
-implementation
-{
- enum
- {
- I2C_OFF = 0,
- I2C_IDLE = 1,
- I2C_BUSY = 2,
- } soft_i2c_state_t;
-
- uint8_t state = I2C_OFF;
- uint16_t _addr;
- uint8_t _len;
- uint8_t* _data;
- error_t _error;
-
- task void writeDoneTask()
- {
- atomic
- {
- state = I2C_IDLE;
- signal I2CPacket.writeDone( _error, _addr, _len, _data);
- }
- }
-
- task void readDoneTask()
- {
- atomic
- {
- state = I2C_IDLE;
- signal I2CPacket.readDone( _error, _addr, _len, _data);
- }
- }
-
- async command error_t AsyncStdControl.start()
- {
- atomic
- {
- if (state == I2C_OFF)
- {
- call I2C.init();
- state = I2C_IDLE;
- return SUCCESS;
- }
- else
- {
- return FAIL;
- }
- }
- }
-
- async command error_t AsyncStdControl.stop()
- {
- atomic
- {
- if (state == I2C_IDLE)
- {
- call I2C.off();
- state = I2C_OFF;
- return SUCCESS;
- }
- else
- {
- return FAIL;
- }
- }
- }
-
- async command error_t I2CPacket.read(i2c_flags_t flags,
- uint16_t addr,
- uint8_t len,
- uint8_t* data)
- {
- int i;
- atomic
- {
- if (state == I2C_IDLE)
- {
- state = I2C_BUSY;
- }
- else if (state == I2C_OFF)
- {
-
- return EOFF;
- }
- else
- {
-
- return EBUSY;
- }
- }
- atomic
- {
- if (len < 1) // A 0-length packet with no start and no stop....
- {
- state = I2C_IDLE;
- return FAIL;
- }
-
- if (flags & I2C_START)
- {
- call I2C.start();
- call I2C.writeByte(addr+1);
- }
-
- // Read the information.
- for (i = 0; i < len-1; ++i)
- {
- data[i] = call I2C.readByte(true);
- }
- data[len-1] = call I2C.readByte(I2C_ACK_END);
- if (flags & I2C_STOP)
- {
- call I2C.stop();
- }
-
- _error = SUCCESS;
- _addr = addr;
- _len = len;
- _data = data;
- }
- post readDoneTask();
-
- return SUCCESS;
- }
-
- async command error_t I2CPacket.write(i2c_flags_t flags,
- uint16_t addr,
- uint8_t len,
- uint8_t* data)
- {
- int i;
-
- atomic
- {
- if (state == I2C_IDLE)
- {
- state = I2C_BUSY;
- }
- else if (state == I2C_OFF)
- {
- return EOFF;
- }
- else
- {
-
- return EBUSY;
- }
- }
- atomic
- {
- if (len < 1) // A 0-length packet with no start and no stop....
- {
- state = I2C_IDLE;
- return FAIL;
- }
- if (flags & I2C_START)
- {
- call I2C.start();
- call I2C.writeByte(addr);
- }
-
- // Send information.
- for (i = 0; i < len; ++i)
- {
- call I2C.writeByte(data[i]);
- }
-
- if (flags & I2C_STOP)
- {
- call I2C.stop();
- }
-
- _data = data;
- _addr = addr;
- _len = len;
- _error = SUCCESS;
- }
- post writeDoneTask();
- return SUCCESS;
- }
-
-
-
-}
projects / tinyos-2.x.git / blobdiff