Tom Coxon / Mbed 2 deprecated EA_BigBen

Test of Embedded Artists LPCXpresso baseboard ethernet, SD card, audio and OLED display facilities. The program displays the day, date and time on the baseboard OLED and sounds the Big Ben chimes on the hour and quarter hour. On initial startup the program checks that the mbed clock is set and that the chime wav files can be accessed on the SD card. If not it asks to be connected to the internet to obtain the current time and to download the wav files to the SD card.

Dependencies:   EthernetNetIf NTPClient_NetServices mbed EAOLED

wavplayer.h

Committer:
tom_coxon
Date:
2010-08-14
Revision:
0:f61e8db0570d

File content as of revision 0:f61e8db0570d:

/*
 Library wave file player by Tom Coxon

 Based on WAVEplayer by Vlad Cazan/Stephan Rochon modified by Tom Coxon to:

 1. Run correctly on the Embedded Artists LPCXpresso baseboard.
 2. To play 8 bit sample size in addition to original 16 bit
 3. To be more fault tolerant when playing wav files.
*/

#ifndef WAVPLAYER_H
#define WAVPLAYER_H

#include "mbed.h"

#define SAMPLE_FREQ 40000
#define BUF_SIZE (SAMPLE_FREQ/10)
#define SLICE_BUF_SIZE 1

typedef struct uFMT_STRUCT {
    short comp_code;
    short num_channels;
    unsigned sample_rate;
    unsigned avg_Bps;
    short block_align;
    short sig_bps;
} FMT_STRUCT;

class WavPlayer {

public:

    void play_wave(char *wavname);

private:

    void cleanup(char *);
    void fill_adc_buf(short *, unsigned);
    void swapword(unsigned *);

// a FIFO for the DAC
    short DAC_fifo[256];
    short DAC_wptr;
    short DAC_rptr;
    short DAC_on;

    void dac_out();

};

#endif