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author | Gregory Nutt <gnutt@nuttx.org> | 2013-11-10 14:08:45 -0600 |
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committer | Gregory Nutt <gnutt@nuttx.org> | 2013-11-10 14:08:45 -0600 |
commit | 09adf63b2a9d364123bff73902472a974dc1b0b2 (patch) | |
tree | 4e246ca2a0ed312359613b5c002bd924562afa1f /apps/examples/i2schar/i2schar_receiver.c | |
parent | 9336004836dc64aa433b8ec963113604b26ee784 (diff) | |
download | px4-nuttx-09adf63b2a9d364123bff73902472a974dc1b0b2.tar.gz px4-nuttx-09adf63b2a9d364123bff73902472a974dc1b0b2.tar.bz2 px4-nuttx-09adf63b2a9d364123bff73902472a974dc1b0b2.zip |
Add apps/examples/i2schar that will eventually use the I2C character drvier to verify I2S
Diffstat (limited to 'apps/examples/i2schar/i2schar_receiver.c')
-rw-r--r-- | apps/examples/i2schar/i2schar_receiver.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/apps/examples/i2schar/i2schar_receiver.c b/apps/examples/i2schar/i2schar_receiver.c new file mode 100644 index 000000000..40256d571 --- /dev/null +++ b/apps/examples/i2schar/i2schar_receiver.c @@ -0,0 +1,174 @@ +/**************************************************************************** + * examples/i2schar/i2schar_receiver.c + * + * Copyright (C) 2013 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * 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 <nuttx/audio/audio.h> + +#include "i2schar.h" + +#ifdef CONFIG_EXAMPLES_I2SCHAR_RX + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: i2schar_receiver() + * + * Description: + * This is the entry point for the receiver thread. + * + ****************************************************************************/ + +pthread_addr_t i2schar_receiver(pthread_addr_t arg) +{ + FAR struct ap_buffer_s *apb; + struct audio_buf_desc_s desc; + int bufsize; + int nread; + int fd; + int i; + + /* Open the I2C character device */ + + fd = open(g_i2schar.devpath, O_RDONLY); + if (fd < 0) + { + int errcode = errno; + message("i2schar_receiver: ERROR: failed to open %s: %d\n", + g_i2schar.devpath, errcode); + pthread_exit(NULL); + } + + /* Loop for the requested number of times */ + + for (i = 0; i < CONFIG_EXAMPLES_I2SCHAR_TXBUFFERS; i++) + { + /* Allocate an audio buffer of the configured size */ + + desc.numbytes = CONFIG_EXAMPLES_I2SCHAR_BUFSIZE; + desc.u.ppBuffer = &apb; + + bufsize = apb_alloc(&desc); + if (bufsize < 0) + { + message("i2schar_receiver: ERROR: failed to allocate buffer %d: %d\n", + i+1, bufsize); + close(fd); + pthread_exit(NULL); + } + + /* Then receifve into the buffer */ + + do + { + /* Flush any output before reading */ + + msgflush(); + + /* Read the buffer to the I2S character driver */ + + nread = read(fd, apb, bufsize); + if (nread < 0) + { + int errcode = errno; + if (errcode != EINTR) + { + message("i2schar_receiver: ERROR: read failed: %d\n", + errcode); + close(fd); + pthread_exit(NULL); + } + } + else if (nread != bufsize) + { + message("i2schar_receiver: ERROR: partial read: %d\n", + nread); + close(fd); + pthread_exit(NULL); + } + else + { + message("i2schar_receiver: Received buffer %d\n", i+1); + } + } + while (nread != bufsize); + + /* Make sure that the transmitter thread has a chance to run */ + + pthread_yield(); + } + + close(fd); + return NULL; +} + +#endif /* CONFIG_EXAMPLES_I2SCHAR_RX */ |