A wave player demo setup for the mbed application board. Reads a wave file from a USB flash drive, and outputs to the onboard speaker (very low volume) and the analog audio out jack that can be connected to a set of PC speakers for more volume. A wave file for the demo is available at http://mbed.org/media/uploads/4180_1/sample.wav. Copy it to the USB drive. See http://mbed.org/users/4180_1/notebook/application-board-waveplayer-demo/ for more details and instructions.

Dependencies:   USBHost mbed wave_player_appbd

Fork of USBHostMSD_HelloWorld by Samuel Mokrani

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Show/hide line numbers main.cpp Source File


00001 #include "mbed.h"
00002 #include "USBHostMSD.h"
00003 #include "wave_player.h"
00004 //mbed Application board waveplayer demo
00005 //Plays the wave file "sample.wav" on the USB flash drive
00006 //Outputs to onboard speaker (but at very low volume)
00007 //and the Audio Out jack for connection to a set of amplified PC speakers (at higher volume)
00008 //Needs a USB flash drive inserted with the wav file on it to run
00010 //Analog Out Jack
00011 AnalogOut DACout(p18);
00012 //On Board Speaker
00013 PwmOut PWMout(p26);
00015 wave_player waver(&DACout,&PWMout);
00017 int main()
00018 {
00019     USBHostMSD msd("usb");
00020     FILE *wave_file;
00021     //setup PWM hardware for a Class D style audio output
00022     PWMout.period(1.0/400000.0);
00023     printf("\n\n\nHello, wave world!\n");
00024     // wait until connected to a USB device
00025     while(!msd.connect()) {
00026         Thread::wait(500);
00027     }
00028     //open wav file and play it
00029     wave_file=fopen("/usb/sample.wav","r");
00030     waver.play(wave_file);
00031     fclose(wave_file);
00032     //end of program
00033     while(1) {};
00034 }