diff options
Diffstat (limited to 'apps/examples/i2schar/i2schar_transmitter.c')
-rw-r--r-- | apps/examples/i2schar/i2schar_transmitter.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/apps/examples/i2schar/i2schar_transmitter.c b/apps/examples/i2schar/i2schar_transmitter.c new file mode 100644 index 000000000..96717d2d0 --- /dev/null +++ b/apps/examples/i2schar/i2schar_transmitter.c @@ -0,0 +1,184 @@ +/**************************************************************************** + * examples/i2schar/i2schar_transmitter.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_TX + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: i2schar_transmitter() + * + * Description: + * This is the entry point for the transmitter thread. + * + ****************************************************************************/ + +pthread_addr_t i2schar_transmitter(pthread_addr_t arg) +{ + FAR struct ap_buffer_s *apb; + struct audio_buf_desc_s desc; + uint8_t crap; + uint8_t *ptr; + int bufsize; + int nwritten; + int fd; + int i; + int j; + + /* Open the I2C character device */ + + fd = open(g_i2schar.devpath, O_WRONLY); + if (fd < 0) + { + int errcode = errno; + message("i2schar_transmitter: ERROR: failed to open %s: %d\n", + g_i2schar.devpath, errcode); + pthread_exit(NULL); + } + + /* Loop for the requested number of times */ + + for (i = 0, crap = 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_transmitter: ERROR: failed to allocate buffer %d: %d\n", + i+1, bufsize); + close(fd); + pthread_exit(NULL); + } + + /* Fill the audio buffer with crap */ + + for (j = 0, ptr = apb->samp; j < CONFIG_EXAMPLES_I2SCHAR_BUFSIZE; j++) + { + *ptr++ = crap++; + } + + /* Then send the buffer */ + + do + { + /* Flush any output before writing */ + + msgflush(); + + /* Write the buffer to the I2S character driver */ + + nwritten = write(fd, apb, bufsize); + if (nwritten < 0) + { + int errcode = errno; + if (errcode != EINTR) + { + message("i2schar_transmitter: ERROR: write failed: %d\n", + errcode); + close(fd); + pthread_exit(NULL); + } + } + else if (nwritten != bufsize) + { + message("i2schar_transmitter: ERROR: partial write: %d\n", + nwritten); + close(fd); + pthread_exit(NULL); + } + else + { + message("i2schar_transmitter: Send buffer %d\n", i+1); + } + } + while (nwritten != bufsize); + + /* Make sure that the receiver thread has a chance to run */ + + pthread_yield(); + } + + close(fd); + return NULL; +} + +#endif /* CONFIG_EXAMPLES_I2SCHAR_TX */ |