Add apps/examples/i2schar that will eventually use the I2C character drvier to verify I2S

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 */