103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
/****************************************************************************
|
|
* drivers/1wire/1wire_writeread.c
|
|
*
|
|
* 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <assert.h>
|
|
|
|
#include <nuttx/1wire/1wire.h>
|
|
#include <nuttx/1wire/1wire_master.h>
|
|
|
|
#include "1wire_internal.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: 1wire_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)
|
|
{
|
|
int ret;
|
|
|
|
/* Avoid calling this function from a search callback to prevent a
|
|
* deadlock
|
|
*/
|
|
|
|
if (master->insearch == true)
|
|
{
|
|
return -EAGAIN;
|
|
}
|
|
|
|
ret = onewire_sem_wait(master);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
ret = onewire_reset_select(master, config->romcode);
|
|
if (ret < 0)
|
|
{
|
|
goto err_unlock;
|
|
}
|
|
|
|
/* Perform the transfer. */
|
|
|
|
ret = ONEWIRE_WRITE(master->dev, wbuffer, wbuflen);
|
|
if (ret < 0)
|
|
{
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = ONEWIRE_READ(master->dev, rbuffer, rbuflen);
|
|
|
|
err_unlock:
|
|
onewire_sem_post(master);
|
|
return ret;
|
|
}
|