a29d9ea9da
to get the prototypes or macros are defined in it Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
/****************************************************************************
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* apps/examples/i2sloop/i2sloop_main.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 <nuttx/audio/audio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <signal.h>
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#include <unistd.h>
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static bool g_i2sloop_running;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static void _signal_handler(int number)
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{
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g_i2sloop_running = false;
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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: i2sloop_main
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****************************************************************************/
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int main(int argc, FAR char *argv[])
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{
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FAR struct ap_buffer_s *apb;
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struct audio_buf_desc_s desc;
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ssize_t bufsize;
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int ret;
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int fd;
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int opt;
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int ch;
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int freq;
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ch = 1;
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freq = 16000;
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while ((opt = getopt(argc, argv, "c:f:")) != -1)
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{
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switch (opt)
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{
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case 'c':
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ch = atoi(optarg);
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break;
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case 'f':
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freq = atoi(optarg);
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break;
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}
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}
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/* Open the I2S character device */
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fd = open("/dev/i2schar0", O_RDWR);
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DEBUGASSERT(0 < fd);
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/* Setup sample freq for i2s */
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struct audio_caps_desc_s cap_desc;
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cap_desc.caps.ac_len = sizeof(struct audio_caps_s);
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cap_desc.caps.ac_type = AUDIO_TYPE_OUTPUT | AUDIO_TYPE_INPUT;
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cap_desc.caps.ac_controls.w = freq;
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cap_desc.caps.ac_channels = ch;
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cap_desc.caps.ac_format.hw = AUDIO_FMT_PCM;
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ioctl(fd, AUDIOIOC_CONFIGURE, (unsigned long)&cap_desc);
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/* Allocate an audio buffer */
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desc.numbytes = 1024;
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desc.u.pbuffer = &apb;
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ret = apb_alloc(&desc);
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DEBUGASSERT(ret == sizeof(desc));
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signal(1, _signal_handler);
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g_i2sloop_running = true;
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while (g_i2sloop_running)
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{
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bufsize = sizeof(struct ap_buffer_s) + apb->nmaxbytes;
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ret = read(fd, apb, bufsize);
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if (0 < ret)
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{
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apb->nbytes = apb->nmaxbytes;
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bufsize = sizeof(struct ap_buffer_s) + apb->nbytes;
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ret = write(fd, apb, bufsize);
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}
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}
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apb_free(apb);
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close(fd);
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return EXIT_SUCCESS;
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}
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