11f2d5e5e4
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.
139 lines
4.4 KiB
C
139 lines
4.4 KiB
C
/****************************************************************************
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* apps/examples/rmtchar/rmtchar_receiver.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <pthread.h>
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#include <errno.h>
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#include <debug.h>
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#include <unistd.h>
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#include "rmtchar.h"
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#ifdef CONFIG_EXAMPLES_RMTCHAR_RX
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: rmtchar_receiver()
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*
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* Description:
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* This is the entry point for the receiver thread.
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*
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****************************************************************************/
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pthread_addr_t rmtchar_receiver(pthread_addr_t arg)
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{
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FAR struct rmtchar_state_s *rmtchar = (FAR struct rmtchar_state_s *)arg;
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struct rmt_item32_s buf[rmtchar->rmtchar_items];
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int nread;
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int fd;
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/* Open the RMT character device */
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fd = open(rmtchar->rxdevpath, O_RDONLY);
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if (fd < 0)
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{
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int errcode = errno;
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printf("rmtchar_receiver: ERROR: failed to open %s: %d\n",
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rmtchar->rxdevpath, errcode);
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pthread_exit(NULL);
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}
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/* Flush any output before reading */
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fflush(stdout);
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/* Read the buffer to the RMT character driver */
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nread = read(fd, (char *)buf, rmtchar->rmtchar_items *
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sizeof(struct rmt_item32_s));
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if (nread < 0)
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{
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int errcode = errno;
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if (errcode != EINTR)
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{
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printf("rmtchar_receiver: ERROR: read failed: %d\n",
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errcode);
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close(fd);
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pthread_exit(NULL);
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}
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}
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else
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{
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if (nread != (rmtchar->rmtchar_items * sizeof(struct rmt_item32_s)))
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{
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printf("rmtchar_receiver: ERROR: partial read: %d\n",
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nread);
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printf("rmtchar_receiver: Received buffer:\n");
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print_items(buf, nread / sizeof(struct rmt_item32_s));
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close(fd);
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pthread_exit(NULL);
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}
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else
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{
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printf("rmtchar_receiver: Received buffer:\n");
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print_items(buf, nread / sizeof(struct rmt_item32_s));
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}
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}
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/* Make sure that the transmitter thread has a chance to run */
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pthread_yield();
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close(fd);
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return NULL;
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}
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#endif /* CONFIG_EXAMPLES_RMTCHAR_RX */
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