nuttx-apps/examples/rmtchar/rmtchar_receiver.c
Tiago Medicci Serrano 11f2d5e5e4 examples/rmtchar: Implement RX and/or TX using the RMT char driver
The RMT (remote control) character driver is used to send and/or
receive data packets. Eventually, this app can be used to perform
a loopback test to validate the RMT driver implementation.
2023-12-19 03:34:28 -08:00

139 lines
4.4 KiB
C

/****************************************************************************
* apps/examples/rmtchar/rmtchar_receiver.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 <sys/types.h>
#include <stdio.h>
#include <fcntl.h>
#include <pthread.h>
#include <errno.h>
#include <debug.h>
#include <unistd.h>
#include "rmtchar.h"
#ifdef CONFIG_EXAMPLES_RMTCHAR_RX
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: rmtchar_receiver()
*
* Description:
* This is the entry point for the receiver thread.
*
****************************************************************************/
pthread_addr_t rmtchar_receiver(pthread_addr_t arg)
{
FAR struct rmtchar_state_s *rmtchar = (FAR struct rmtchar_state_s *)arg;
struct rmt_item32_s buf[rmtchar->rmtchar_items];
int nread;
int fd;
/* Open the RMT character device */
fd = open(rmtchar->rxdevpath, O_RDONLY);
if (fd < 0)
{
int errcode = errno;
printf("rmtchar_receiver: ERROR: failed to open %s: %d\n",
rmtchar->rxdevpath, errcode);
pthread_exit(NULL);
}
/* Flush any output before reading */
fflush(stdout);
/* Read the buffer to the RMT character driver */
nread = read(fd, (char *)buf, rmtchar->rmtchar_items *
sizeof(struct rmt_item32_s));
if (nread < 0)
{
int errcode = errno;
if (errcode != EINTR)
{
printf("rmtchar_receiver: ERROR: read failed: %d\n",
errcode);
close(fd);
pthread_exit(NULL);
}
}
else
{
if (nread != (rmtchar->rmtchar_items * sizeof(struct rmt_item32_s)))
{
printf("rmtchar_receiver: ERROR: partial read: %d\n",
nread);
printf("rmtchar_receiver: Received buffer:\n");
print_items(buf, nread / sizeof(struct rmt_item32_s));
close(fd);
pthread_exit(NULL);
}
else
{
printf("rmtchar_receiver: Received buffer:\n");
print_items(buf, nread / sizeof(struct rmt_item32_s));
}
}
/* Make sure that the transmitter thread has a chance to run */
pthread_yield();
close(fd);
return NULL;
}
#endif /* CONFIG_EXAMPLES_RMTCHAR_RX */