ST / Mbed 2 deprecated HelloWorld_CCA02M1

Simple test application for the STMicroelectronics X-NUCLEO-CCA02M1 MEMS Microphones Expansion Board, built against mbed classic.

Dependencies:   X_NUCLEO_CCA02M1 mbed ST_Events-old

Fork of HelloWorld_CCA02M1_mbedOS by ST

Recording audio with the X-NUCLEO-CCA02M1 Expansion Board

This application provides a simple example of usage of the X-NUCLEO-CCA02M1 MEMS Microphones Expansion Board, built against mbed classic 2.x.

It shows how to record a 2-channel stereo signal as an array of PCM samples (16 bit/sample) that can be acquired through an audio SW like Audacity, for example.

Microphones configuration

Currently the configurations supported are the following:

  • Stereo@48KHz
  • Stereo@44.1KHz (default, CD audio quality)
  • Stereo@32KHz
  • Stereo@16KHz
  • Stereo@8KHz
  • Mono@48KHz
  • Mono@44.1KHz
  • Mono@32KHz
  • Mono@16KHz
  • Mono@8KHz

Mono configurations need a Jumper connecting PB_5 and PB_13 on the Morpho connector to properly work.


Platform compatibility

  • This board can be currently used with the Nucleo F4 Family only, please see the ST_I2S library compatibility for further information.
  • Please note that the main application makes use of the "events" library (i.e. the "ST_Events" library imported as "events" library), which is not included into the "mbed" library.
  • The application built against mbed OS can be found here.


Acquiring through the USB on Windows

In order to acquire the recorded PCM audio channel with an audio SW on a PC, please connect the expansion board to a USB port of the PC, and the Nucleo board to a USB power supply.
On Windows, click on the speaker icon on the bottom bar, select "Recording devices", "Microphone", "Properties", then click on the "Advanced" panel, and select "1/2 channels, 16 bit, 16/32KHz" according to board configuration.
Open your preferred audio SW, like "Audacity" for example, configure it to acquire a 2-channel stereo at 16KHz (for default configuration), and record.

Files at this revision

API Documentation at this revision

Revision 11:e4e1ce8b3a26, committed 2017-05-04

Comitter:
Davidroid
Date:
Thu May 04 10:40:50 2017 +0000
Parent:
10:a175948482b2
Child:
12:203c08553f4d
Commit message:
Enabled default configuration at 44.1 KHz (CD audio quality).

Changed in this revision

X_NUCLEO_CCA02M1.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 
--- a/X_NUCLEO_CCA02M1.lib	Wed May 03 16:34:44 2017 +0000
+++ b/X_NUCLEO_CCA02M1.lib	Thu May 04 10:40:50 2017 +0000
@@ -1,1 +1,1 @@
-http://developer.mbed.org/teams/ST/code/X_NUCLEO_CCA02M1/#bc6113bdde85
+http://developer.mbed.org/teams/ST/code/X_NUCLEO_CCA02M1/#1a061e306cc9

--- a/main.cpp	Wed May 03 16:34:44 2017 +0000
+++ b/main.cpp	Thu May 04 10:40:50 2017 +0000
@@ -59,7 +59,7 @@
  */
 XNucleoCCA02M1_init_t init =
 {
-	32000,   /* Default Sampling Frequency [Hz]. */
+	44100,   /* Default Sampling Frequency [Hz]. */
     2        /* Default number of channels. */
 };