203 lines
7.4 KiB
C
203 lines
7.4 KiB
C
/****************************************************************************
|
|
* include/nuttx/1wire/1wire_master.h
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __INCLUDE_NUTTX_1WIRE_1WIRE_MASTER_H
|
|
#define __INCLUDE_NUTTX_1WIRE_1WIRE_MASTER_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
|
|
/****************************************************************************
|
|
* Public Types
|
|
****************************************************************************/
|
|
|
|
struct onewire_dev_s;
|
|
struct onewire_master_s;
|
|
|
|
struct onewire_config_s
|
|
{
|
|
uint64_t romcode; /* Unique device identifier */
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: onewire_write
|
|
*
|
|
* Description:
|
|
* Send a block of data on 1WIRE. Each write operation will be an 'atomic'
|
|
* operation in the sense that any other 1WIRE actions will be serialized
|
|
* and pend until this write completes.
|
|
*
|
|
* Input Parameters:
|
|
* master - Device-specific state data
|
|
* config - Described the 1WIRE configuration
|
|
* buffer - A pointer to the read-only buffer of data to be written to
|
|
* device
|
|
* buflen - The number of bytes to send from the buffer
|
|
*
|
|
* Returned Value:
|
|
* 0: success, <0: A negated errno
|
|
*
|
|
****************************************************************************/
|
|
|
|
int onewire_write(FAR struct onewire_master_s *master,
|
|
FAR const struct onewire_config_s *config,
|
|
FAR const uint8_t *buffer, int buflen);
|
|
|
|
/****************************************************************************
|
|
* Name: onewire_read
|
|
*
|
|
* Description:
|
|
* Receive a block of data from 1WIRE. Each read operation will be an
|
|
* 'atomic' operation in the sense that any other 1WIRE actions will be
|
|
* serialized and pend until this read completes.
|
|
*
|
|
* Input Parameters:
|
|
* master - Device-specific state data
|
|
* config - Described the 1WIRE configuration
|
|
* buffer - A pointer to a buffer of data to receive the data from the
|
|
* device
|
|
* buflen - The requested number of bytes to be read
|
|
*
|
|
* Returned Value:
|
|
* 0: success, <0: A negated errno
|
|
*
|
|
****************************************************************************/
|
|
|
|
int onewire_read(FAR struct onewire_master_s *master,
|
|
FAR const struct onewire_config_s *config,
|
|
FAR uint8_t *buffer, int buflen);
|
|
|
|
/****************************************************************************
|
|
* Name: onewire_writeread
|
|
*
|
|
* Description:
|
|
* Receive a block of data from 1WIRE. Each read operation will be an
|
|
* 'atomic' operation in the sense that any other 1WIRE actions will be
|
|
* serialized and pend until this read completes.
|
|
*
|
|
* Input Parameters:
|
|
* master - Device-specific state data
|
|
* config - Described the 1WIRE configuration
|
|
* wbuffer - A pointer to the read-only buffer of data to be written to
|
|
* device
|
|
* wbuflen - The number of bytes to send from the buffer
|
|
* rbuffer - A pointer to a buffer of data to receive the data from the
|
|
* device
|
|
* rbuflen - The requested number of bytes to be read
|
|
*
|
|
* Returned Value:
|
|
* 0: success, <0: A negated errno
|
|
*
|
|
****************************************************************************/
|
|
|
|
int onewire_writeread(FAR struct onewire_master_s *master,
|
|
FAR const struct onewire_config_s *config,
|
|
FAR const uint8_t *wbuffer, int wbuflen,
|
|
FAR uint8_t *rbuffer, int rbuflen);
|
|
|
|
/****************************************************************************
|
|
* Name: onewire_search
|
|
*
|
|
* Description:
|
|
* Search all devices from a 1-wire network. This is the 1-wire search
|
|
* algorithm from Maxim Application Note 187. Note! This is an atomic
|
|
* operation. The callback 'cb_search' can't execute any function that will
|
|
* lock this bus, because of the locked state as long the search is active.
|
|
*
|
|
* Input Parameters:
|
|
* master - Pointer to the allocated 1-wire interface
|
|
* family - Limit search to devices of matching family
|
|
* alarmonly - Limit search to devices on alarm state
|
|
* cb_search - Callback to call on each device found
|
|
* arg - Argument passed to cb_search
|
|
*
|
|
* Return Value:
|
|
* Number of slaves present and matching family.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int onewire_search(FAR struct onewire_master_s *master,
|
|
int family,
|
|
bool alarmonly,
|
|
CODE void (*cb_search)(int family,
|
|
uint64_t romcode,
|
|
FAR void *arg),
|
|
FAR void *arg);
|
|
|
|
/****************************************************************************
|
|
* Name: onewire_isalarm
|
|
*
|
|
* Description:
|
|
* Check if a 1wire devices has set the alarm flag in an atomic operation.
|
|
*
|
|
* Input Parameters:
|
|
* master - Pointer to the allocated 1-wire interface
|
|
* config - Described the 1WIRE configuration
|
|
*
|
|
* Return Value:
|
|
* 0 - no alarm flag is set
|
|
* 1 - alaram flag is set
|
|
* < 0 - in case of error
|
|
*
|
|
****************************************************************************/
|
|
|
|
int onewire_isalarm(FAR struct onewire_master_s *master,
|
|
FAR const struct onewire_config_s *config);
|
|
|
|
/****************************************************************************
|
|
* Name: onewire_initialize
|
|
*
|
|
* Description:
|
|
* Return 1-wire bus master from 1-wire lower half device.
|
|
*
|
|
* Input Parameters:
|
|
* dev - Pointer to the allocated 1-wire lower half
|
|
* maxslaves - Maximum number of 1-wire slave devices
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct onewire_master_s *
|
|
onewire_initialize(FAR struct onewire_dev_s *dev, int maxslaves);
|
|
|
|
/****************************************************************************
|
|
* Name: onewire_uninitialize
|
|
*
|
|
* Description:
|
|
* Release 1-wire bus master.
|
|
*
|
|
* Input Parameters:
|
|
* master - Pointer to the allocated 1-wire master
|
|
*
|
|
****************************************************************************/
|
|
|
|
int onewire_uninitialize(FAR struct onewire_master_s *master);
|
|
|
|
#endif /* __INCLUDE_NUTTX_1WIRE_1WIRE_MASTER_H */
|