ST / Mbed 2 deprecated HelloWorld_CCA01M1

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Dependencies:   X_NUCLEO_CCA01M1 ST_Events-old mbed

Fork of HelloWorld_CCA01M1_mbedOS by ST

Playing audio with the X-NUCLEO-CCA01M1 Expansion Board

This application provides a simple example of usage of the X-NUCLEO-CCA01M1 Sound Terminal Expansion Board, built against mbed classic.

It shows how to play a 2-channel stereo signal stored in an array of PCM samples directly on the speakers connected to the expansion board.

It also allows to stop/play the audio by pressing the user button on the Nucleo board.


Platform compatibility

  • This board can be currently used with a Nucleo-F401RE board only and has been tested with the default configuration provided by this example.
  • Please note that the main application makes use of the "events" library, which is not included into the "mbed" library.
  • The application built against mbed OS 5.x can be found here.

Files at this revision

API Documentation at this revision

Revision 9:34ebb3f5a2ad, committed 2017-05-15

Comitter:
Davidroid
Date:
Mon May 15 15:51:10 2017 +0000
Parent:
8:ff75f4f451d2
Commit message:
Simple test application for the STMicroelectronics X-NUCLEO-CCA01M1 MEMS Microphones Expansion Board, built against mbed classic.

Changed in this revision

events.lib Show annotated file Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed-os.lib Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/events.lib	Mon May 15 15:51:10 2017 +0000
@@ -0,0 +1,1 @@
+http://developer.mbed.org/teams/ST/code/ST_Events/#dba7bd0f39f3

--- a/main.cpp	Wed May 03 16:32:32 2017 +0000
+++ b/main.cpp	Mon May 15 15:51:10 2017 +0000
@@ -41,7 +41,6 @@
 
 /* mbed specific header files. */
 #include "mbed.h"
-#include "rtos.h"
 
 
 #if DEVICE_I2S
@@ -74,54 +73,10 @@
 /* Sound Terminal Component. */
 STA350BW *sound_terminal;
 
-/* Thread to manage I2S peripherals. */
-static rtos::Thread i2s_bh_daemon;
-
-/* Threads. */
-Thread *play_stop_thread;
-
-/* User button handling. */
-InterruptIn event(USER_BUTTON);
-
 
 /* Functions -----------------------------------------------------------------*/
 
 /**
- * @brief  User button handler function.
- * @param  None.
- * @retval None.
- */
-void pressed(void)
-{
-    /* Signal to play/stop handler thread. */
-    play_stop_thread->signal_set(PLAY_STOP_EVENT);
-}
-
-/**
- * @brief  Play/stop handler function.
- * @param  None.
- * @retval None.
- */
-void play_stop_handler(void)
-{
-    while (true)
-    {
-        static bool stop = true;
-
-        /* Waiting for play/stop events. */
-        play_stop_thread->signal_wait(PLAY_STOP_EVENT);
-
-        if (stop)
-            sound_terminal->stop();
-        else
-            sound_terminal->play((int16_t *) my_song, (uint16_t) sizeof(my_song), true);
-        printf("--> %s\r\n", stop ? "Stop." : "Playing...");
-
-        stop = !stop;
-    }
-}
-
-/**
  * @brief  Entry point function of mbedOS.
  * @param  None
  * @retval None
@@ -145,17 +100,6 @@
         exit(EXIT_FAILURE);
     }
 
-    /* Starting a thread to manage I2S peripherals. */
-    Callback<void()> i2s_bh_task(&I2S::i2s_bh_queue, &events::EventQueue::dispatch_forever);
-    i2s_bh_daemon.start(i2s_bh_task);
-
-    /* Scheduling the play/stop function. */
-    play_stop_thread = new Thread();
-    osStatus status = play_stop_thread->start(play_stop_handler);
-    if (status != osOK)
-        printf("Could not start the play/stop handler thread.\r\n");
-    event.fall(&pressed);
-
     /* Setting Sound Terminal Component's parameters. */
     sound_terminal->set_frequency(MY_SONG_AUDIO_FREQUENCY);
     sound_terminal->set_volume(STA350BW_CHANNEL_MASTER, 60);
@@ -169,6 +113,9 @@
     /* Printing to the console. */
     printf("--> Playing...\r\n");
     sound_terminal->play((int16_t *) my_song, (uint16_t) sizeof(my_song), true);
+
+    /* Dispatching forever the I2S queue. */
+    I2S::i2s_bh_queue.dispatch_forever();
 }
 
 #else // DEVICE_I2S

--- a/mbed-os.lib	Wed May 03 16:32:32 2017 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-https://github.com/ARMmbed/mbed-os/#42be5c01a7f91292d5e27124ad9584236025f6ab

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Mon May 15 15:51:10 2017 +0000
@@ -0,0 +1,1 @@
+https://mbed.org/users/mbed_official/code/mbed/builds/4eea097334d6
\ No newline at end of file