jim hamblen
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
Revision 9:f1aebfbe7e78, committed 2013-11-01
- Comitter:
- 4180_1
- Date:
- Fri Nov 01 15:30:47 2013 +0000
- Parent:
- 8:758190c6c455
- Commit message:
- 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 (low volume) and the audio out jack that can be connected to a set of PC speakers.
Changed in this revision
diff -r 758190c6c455 -r f1aebfbe7e78 USBHost.lib --- a/USBHost.lib Thu Mar 14 14:23:42 2013 +0000 +++ b/USBHost.lib Fri Nov 01 15:30:47 2013 +0000 @@ -1,1 +1,1 @@ -https://mbed.org/users/mbed_official/code/USBHost/#7671b6a8c363 +https://mbed.org/users/mbed_official/code/USBHost/#37c948cf0dbf
diff -r 758190c6c455 -r f1aebfbe7e78 main.cpp
--- a/main.cpp Thu Mar 14 14:23:42 2013 +0000
+++ b/main.cpp Fri Nov 01 15:30:47 2013 +0000
@@ -1,50 +1,34 @@
#include "mbed.h"
#include "USBHostMSD.h"
-
-DigitalOut led(LED1);
+#include "wave_player.h"
+//mbed Application board waveplayer demo
+//Plays the wave file "sample.wav" on the USB flash drive
+//Outputs to onboard speaker (but at very low volume)
+//and the Audio Out jack for connection to a set of amplified PC speakers (at higher volume)
+//Needs a USB flash drive inserted with the wav file on it to run
-void msd_task(void const *) {
-
+//Analog Out Jack
+AnalogOut DACout(p18);
+//On Board Speaker
+PwmOut PWMout(p26);
+
+wave_player waver(&DACout,&PWMout);
+
+int main()
+{
USBHostMSD msd("usb");
- int i = 0;
-
- while(1) {
-
- // try to connect a MSD device
- while(!msd.connect()) {
- Thread::wait(500);
- }
-
- // in a loop, append a file
- // if the device is disconnected, we try to connect it again
- while(1) {
-
- // append a file
- FILE * fp = fopen("/usb/test1.txt", "a");
-
- if (fp != NULL) {
- fprintf(fp, "Hello fun SD Card World: %d!\r\n", i++);
- printf("Goodbye World!\r\n");
- fclose(fp);
- } else {
- printf("FILE == NULL\r\n");
- }
-
- Thread::wait(500);
-
- // if device disconnected, try to connect again
- if (!msd.connected())
- break;
- }
-
- }
-}
-
-
-int main() {
- Thread msdTask(msd_task, NULL, osPriorityNormal, 1024 * 4);
- while(1) {
- led=!led;
+ FILE *wave_file;
+ //setup PWM hardware for a Class D style audio output
+ PWMout.period(1.0/400000.0);
+ printf("\n\n\nHello, wave world!\n");
+ // wait until connected to a USB device
+ while(!msd.connect()) {
Thread::wait(500);
}
+ //open wav file and play it
+ wave_file=fopen("/usb/sample.wav","r");
+ waver.play(wave_file);
+ fclose(wave_file);
+ //end of program
+ while(1) {};
}
\ No newline at end of file
diff -r 758190c6c455 -r f1aebfbe7e78 mbed.bld --- a/mbed.bld Thu Mar 14 14:23:42 2013 +0000 +++ b/mbed.bld Fri Nov 01 15:30:47 2013 +0000 @@ -1,1 +1,1 @@ -http://mbed.org/users/mbed_official/code/mbed/builds/5e5da4a5990b \ No newline at end of file +http://mbed.org/users/mbed_official/code/mbed/builds/f37f3b9c9f0b \ No newline at end of file
diff -r 758190c6c455 -r f1aebfbe7e78 wave_player_appbd.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/wave_player_appbd.lib Fri Nov 01 15:30:47 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/4180_1/code/wave_player_appbd/#b1cea7afcfd2