EA_WavPlayer - Demo of Embedded Artists LPCXpresso baseboard SD …

Users » tom_coxon » Code » EA_WavPlayer

Tom Coxon / Mbed 2 deprecated EA_WavPlayer

Demo of Embedded Artists LPCXpresso baseboard SD card reader and audio facilities. Updated to put wav file player in a separate library and use the high capacity SD card library provided by Klaus Bu.

Dependencies: mbed

main.cpp@1:22c43c468a2f, 2010-07-09 (annotated)

Committer:: tom_coxon
Date:: Fri Jul 09 14:25:50 2010 +0000
Revision:: 1:22c43c468a2f
Parent:: 0:1f4b7aa80ab3
Child:: 2:affcc36a50b4

Who changed what in which revision?

User	Revision	Line number	New contents of line
tom_coxon	0:1f4b7aa80ab3	1	/*
tom_coxon	1:22c43c468a2f	2	Demo of Embedded Artists LPCXpresso baseboard SD card reader and audio facilities.
tom_coxon	0:1f4b7aa80ab3	3
tom_coxon	1:22c43c468a2f	4	Based on WAVEplayer by Vlad Cazan/Stephan Rochon modified by Tom Coxon to run correctly on
tom_coxon	1:22c43c468a2f	5	the Embedded Artists LPCXpresso baseboard.
tom_coxon	0:1f4b7aa80ab3	6
tom_coxon	1:22c43c468a2f	7	Also modified to play 8 bit sample size in addition to original 16 bit and to be more fault tolerant
tom_coxon	1:22c43c468a2f	8	when playing wav files.
tom_coxon	0:1f4b7aa80ab3	9
tom_coxon	1:22c43c468a2f	10	Place suitable uncompressed wav files with 8 or 16 bit sample sizes on the SD card and ensure the
tom_coxon	1:22c43c468a2f	11	file names are 8.3 format. Then change the main method below to the relevant file paths.
tom_coxon	0:1f4b7aa80ab3	12
tom_coxon	1:22c43c468a2f	13	Please set all jumpers on board to the default case except for the following:
tom_coxon	0:1f4b7aa80ab3	14
tom_coxon	0:1f4b7aa80ab3	15	Audio setup:
tom_coxon	0:1f4b7aa80ab3	16
tom_coxon	0:1f4b7aa80ab3	17	1. Insert a jumper in J31 to connect signal PIO1_2 to the low
tom_coxon	0:1f4b7aa80ab3	18	pass filer as described in section 4.7.2. of base board users
tom_coxon	0:1f4b7aa80ab3	19	guide.
tom_coxon	0:1f4b7aa80ab3	20
tom_coxon	0:1f4b7aa80ab3	21	2. Insert three jumpers in J33 to connect PIO3_0, PIO3_1 and
tom_coxon	0:1f4b7aa80ab3	22	PIO3_2 to control the amplifier as described in section 4.8
tom_coxon	0:1f4b7aa80ab3	23	of base board users guide.
tom_coxon	0:1f4b7aa80ab3	24
tom_coxon	0:1f4b7aa80ab3	25	3. Insert a jumper in J32 and remove any from J34 to use the
tom_coxon	0:1f4b7aa80ab3	26	internal speaker as described in section 4.8
tom_coxon	0:1f4b7aa80ab3	27	of base board users guide.
tom_coxon	0:1f4b7aa80ab3	28
tom_coxon	0:1f4b7aa80ab3	29	SD Card setup:
tom_coxon	0:1f4b7aa80ab3	30
tom_coxon	0:1f4b7aa80ab3	31	4. Insert all five jumpers in J39 as described in section 4.3.3
tom_coxon	0:1f4b7aa80ab3	32	of base board users guide.
tom_coxon	0:1f4b7aa80ab3	33
tom_coxon	0:1f4b7aa80ab3	34	5. Remove jumper marked "A" in J55 In order to connect PIO1_11
tom_coxon	0:1f4b7aa80ab3	35	to CS signal of J40 (the SPI-SSEL signal) as described in section 4.3.3
tom_coxon	0:1f4b7aa80ab3	36	of base board users guide.
tom_coxon	0:1f4b7aa80ab3	37	*/
tom_coxon	0:1f4b7aa80ab3	38
tom_coxon	0:1f4b7aa80ab3	39	#include "mbed.h"
tom_coxon	0:1f4b7aa80ab3	40	#include "SDFileSystem.h"
tom_coxon	0:1f4b7aa80ab3	41
tom_coxon	0:1f4b7aa80ab3	42	AnalogOut DACout(p18);
tom_coxon	0:1f4b7aa80ab3	43	DigitalOut led1(LED1);
tom_coxon	0:1f4b7aa80ab3	44	DigitalOut led2(LED2);
tom_coxon	0:1f4b7aa80ab3	45	DigitalOut led3(LED3);
tom_coxon	0:1f4b7aa80ab3	46	DigitalOut led4(LED4);
tom_coxon	0:1f4b7aa80ab3	47	Ticker tick;
tom_coxon	0:1f4b7aa80ab3	48	SDFileSystem sd(p5, p6, p7, p24, "sd");
tom_coxon	0:1f4b7aa80ab3	49
tom_coxon	0:1f4b7aa80ab3	50	#define SAMPLE_FREQ 40000
tom_coxon	0:1f4b7aa80ab3	51	#define BUF_SIZE (SAMPLE_FREQ/10)
tom_coxon	0:1f4b7aa80ab3	52	#define SLICE_BUF_SIZE 1
tom_coxon	0:1f4b7aa80ab3	53
tom_coxon	0:1f4b7aa80ab3	54	void dac_out(void);
tom_coxon	0:1f4b7aa80ab3	55	void play_wave(char *);
tom_coxon	0:1f4b7aa80ab3	56	void cleanup(char *);
tom_coxon	0:1f4b7aa80ab3	57	void fill_adc_buf(short *, unsigned);
tom_coxon	0:1f4b7aa80ab3	58	void swapword(unsigned *);
tom_coxon	0:1f4b7aa80ab3	59
tom_coxon	0:1f4b7aa80ab3	60	// a FIFO for the DAC
tom_coxon	0:1f4b7aa80ab3	61	short DAC_fifo[256];
tom_coxon	0:1f4b7aa80ab3	62	short DAC_wptr;
tom_coxon	0:1f4b7aa80ab3	63	short DAC_rptr;
tom_coxon	0:1f4b7aa80ab3	64	short DAC_on;
tom_coxon	0:1f4b7aa80ab3	65
tom_coxon	0:1f4b7aa80ab3	66	typedef struct uFMT_STRUCT {
tom_coxon	0:1f4b7aa80ab3	67	short comp_code;
tom_coxon	0:1f4b7aa80ab3	68	short num_channels;
tom_coxon	0:1f4b7aa80ab3	69	unsigned sample_rate;
tom_coxon	0:1f4b7aa80ab3	70	unsigned avg_Bps;
tom_coxon	0:1f4b7aa80ab3	71	short block_align;
tom_coxon	0:1f4b7aa80ab3	72	short sig_bps;
tom_coxon	0:1f4b7aa80ab3	73	} FMT_STRUCT;
tom_coxon	0:1f4b7aa80ab3	74
tom_coxon	0:1f4b7aa80ab3	75
tom_coxon	0:1f4b7aa80ab3	76	int main() {
tom_coxon	0:1f4b7aa80ab3	77	led1=0;
tom_coxon	0:1f4b7aa80ab3	78	wait(.5);
tom_coxon	0:1f4b7aa80ab3	79	led1=1;
tom_coxon	0:1f4b7aa80ab3	80	wait(.5);
tom_coxon	0:1f4b7aa80ab3	81	led1=0;
tom_coxon	0:1f4b7aa80ab3	82	printf("\r\n--------------- Starting -----------------\r\n");
tom_coxon	0:1f4b7aa80ab3	83
tom_coxon	0:1f4b7aa80ab3	84	play_wave("/sd/startup.wav"); // 8 bit sample size
tom_coxon	0:1f4b7aa80ab3	85
tom_coxon	0:1f4b7aa80ab3	86	play_wave("/sd/baddonut.wav"); // 16 bit sample size
tom_coxon	0:1f4b7aa80ab3	87
tom_coxon	0:1f4b7aa80ab3	88	play_wave("/sd/dduck.wav"); // 8 bit sample size
tom_coxon	0:1f4b7aa80ab3	89
tom_coxon	0:1f4b7aa80ab3	90	play_wave("/sd/bbunny.wav"); // 8 bit sample size
tom_coxon	0:1f4b7aa80ab3	91
tom_coxon	0:1f4b7aa80ab3	92	play_wave("/sd/clint16.wav"); // 16 bit sample size
tom_coxon	0:1f4b7aa80ab3	93
tom_coxon	0:1f4b7aa80ab3	94	printf("<<<<<<<<<<<<<<<< All done >>>>>>>>>>>>>>>>\r\n");
tom_coxon	0:1f4b7aa80ab3	95	led1=1;
tom_coxon	0:1f4b7aa80ab3	96	wait(.5);
tom_coxon	0:1f4b7aa80ab3	97	led1=0;
tom_coxon	0:1f4b7aa80ab3	98	wait(.5);
tom_coxon	0:1f4b7aa80ab3	99	led1=1;
tom_coxon	0:1f4b7aa80ab3	100	}
tom_coxon	0:1f4b7aa80ab3	101
tom_coxon	0:1f4b7aa80ab3	102	void play_wave(char *wavname) {
tom_coxon	0:1f4b7aa80ab3	103	unsigned chunk_id,chunk_size,channel;
tom_coxon	0:1f4b7aa80ab3	104	unsigned data,samp_int,i;
tom_coxon	0:1f4b7aa80ab3	105	short dac_data;
tom_coxon	0:1f4b7aa80ab3	106	char *slice_buf;
tom_coxon	0:1f4b7aa80ab3	107	short *data_sptr;
tom_coxon	0:1f4b7aa80ab3	108	FMT_STRUCT wav_format;
tom_coxon	0:1f4b7aa80ab3	109	FILE *wavfile;
tom_coxon	0:1f4b7aa80ab3	110	long slice,num_slices;
tom_coxon	0:1f4b7aa80ab3	111	DAC_wptr=0;
tom_coxon	0:1f4b7aa80ab3	112	DAC_rptr=0;
tom_coxon	1:22c43c468a2f	113
tom_coxon	1:22c43c468a2f	114	size_t result;
tom_coxon	1:22c43c468a2f	115
tom_coxon	0:1f4b7aa80ab3	116	for (i=0;i<256;i+=2) {
tom_coxon	0:1f4b7aa80ab3	117	DAC_fifo[i]=0;
tom_coxon	0:1f4b7aa80ab3	118	DAC_fifo[i+1]=3000;
tom_coxon	0:1f4b7aa80ab3	119	}
tom_coxon	0:1f4b7aa80ab3	120	DAC_wptr=4;
tom_coxon	0:1f4b7aa80ab3	121	DAC_on=0;
tom_coxon	0:1f4b7aa80ab3	122
tom_coxon	0:1f4b7aa80ab3	123	led1=led2=led3=led4=0;
tom_coxon	0:1f4b7aa80ab3	124
tom_coxon	0:1f4b7aa80ab3	125	printf("Playing wave file '%s'\r\n",wavname);
tom_coxon	0:1f4b7aa80ab3	126
tom_coxon	0:1f4b7aa80ab3	127	wavfile=fopen(wavname,"rb");
tom_coxon	0:1f4b7aa80ab3	128	if (!wavfile) {
tom_coxon	0:1f4b7aa80ab3	129	printf("Unable to open wav file '%s'\r\n",wavname);
tom_coxon	0:1f4b7aa80ab3	130	exit(1);
tom_coxon	0:1f4b7aa80ab3	131	}
tom_coxon	0:1f4b7aa80ab3	132
tom_coxon	0:1f4b7aa80ab3	133	fread(&chunk_id,4,1,wavfile);
tom_coxon	0:1f4b7aa80ab3	134	fread(&chunk_size,4,1,wavfile);
tom_coxon	0:1f4b7aa80ab3	135	while (!feof(wavfile)) {
tom_coxon	0:1f4b7aa80ab3	136	printf("Read chunk ID 0x%x, size 0x%x\r\n",chunk_id,chunk_size);
tom_coxon	0:1f4b7aa80ab3	137	switch (chunk_id) {
tom_coxon	0:1f4b7aa80ab3	138	case 0x46464952:
tom_coxon	0:1f4b7aa80ab3	139	fread(&data,4,1,wavfile);
tom_coxon	0:1f4b7aa80ab3	140	printf("RIFF chunk\r\n");
tom_coxon	0:1f4b7aa80ab3	141	printf(" chunk size %d (0x%x)\r\n",chunk_size,chunk_size);
tom_coxon	0:1f4b7aa80ab3	142	printf(" RIFF type 0x%x\r\n",data);
tom_coxon	0:1f4b7aa80ab3	143	break;
tom_coxon	0:1f4b7aa80ab3	144	case 0x20746d66:
tom_coxon	0:1f4b7aa80ab3	145	fread(&wav_format,sizeof(wav_format),1,wavfile);
tom_coxon	0:1f4b7aa80ab3	146	printf("FORMAT chunk\r\n");
tom_coxon	0:1f4b7aa80ab3	147	printf(" chunk size %d (0x%x)\r\n",chunk_size,chunk_size);
tom_coxon	0:1f4b7aa80ab3	148	printf(" compression code %d\r\n",wav_format.comp_code);
tom_coxon	0:1f4b7aa80ab3	149	printf(" %d channels\r\n",wav_format.num_channels);
tom_coxon	0:1f4b7aa80ab3	150	printf(" %d samples/sec\r\n",wav_format.sample_rate);
tom_coxon	0:1f4b7aa80ab3	151	printf(" %d bytes/sec\r\n",wav_format.avg_Bps);
tom_coxon	0:1f4b7aa80ab3	152	printf(" block align %d\r\n",wav_format.block_align);
tom_coxon	0:1f4b7aa80ab3	153	printf(" %d bits per sample\r\n",wav_format.sig_bps);
tom_coxon	0:1f4b7aa80ab3	154	if (chunk_size > sizeof(wav_format))
tom_coxon	0:1f4b7aa80ab3	155	fseek(wavfile,chunk_size-sizeof(wav_format),SEEK_CUR);
tom_coxon	0:1f4b7aa80ab3	156	// create a slice buffer large enough to hold multiple slices
tom_coxon	0:1f4b7aa80ab3	157	slice_buf=(char )malloc(wav_format.block_alignSLICE_BUF_SIZE);
tom_coxon	0:1f4b7aa80ab3	158	if (!slice_buf) {
tom_coxon	0:1f4b7aa80ab3	159	printf("Unable to malloc slice buffer");
tom_coxon	0:1f4b7aa80ab3	160	exit(1);
tom_coxon	0:1f4b7aa80ab3	161	}
tom_coxon	0:1f4b7aa80ab3	162	break;
tom_coxon	0:1f4b7aa80ab3	163	case 0x61746164:
tom_coxon	0:1f4b7aa80ab3	164	slice_buf=(char )malloc(wav_format.block_alignSLICE_BUF_SIZE);
tom_coxon	0:1f4b7aa80ab3	165	if (!slice_buf) {
tom_coxon	0:1f4b7aa80ab3	166	printf("Unable to malloc slice buffer");
tom_coxon	0:1f4b7aa80ab3	167	exit(1);
tom_coxon	0:1f4b7aa80ab3	168	}
tom_coxon	0:1f4b7aa80ab3	169	num_slices=chunk_size/wav_format.block_align;
tom_coxon	0:1f4b7aa80ab3	170	printf("DATA chunk\r\n");
tom_coxon	0:1f4b7aa80ab3	171	printf(" chunk size %d (0x%x)\r\n",chunk_size,chunk_size);
tom_coxon	0:1f4b7aa80ab3	172	printf(" %d slices\r\n",num_slices);
tom_coxon	0:1f4b7aa80ab3	173	printf(" Ideal sample interval=%d\r\n",(unsigned)(1000000.0/wav_format.sample_rate));
tom_coxon	0:1f4b7aa80ab3	174	samp_int=1000000/(wav_format.sample_rate);
tom_coxon	0:1f4b7aa80ab3	175	printf(" programmed interrupt tick interval=%d\r\n",samp_int);
tom_coxon	0:1f4b7aa80ab3	176
tom_coxon	0:1f4b7aa80ab3	177	// starting up ticker to write samples out -- no printfs until tick.detach is called
tom_coxon	0:1f4b7aa80ab3	178	tick.attach_us(&dac_out, samp_int);
tom_coxon	0:1f4b7aa80ab3	179	DAC_on=1;
tom_coxon	0:1f4b7aa80ab3	180	led2=1;
tom_coxon	0:1f4b7aa80ab3	181	for (slice=0;slice<num_slices;slice+=SLICE_BUF_SIZE) {
tom_coxon	1:22c43c468a2f	182
tom_coxon	1:22c43c468a2f	183	result = fread(slice_buf,wav_format.block_align*SLICE_BUF_SIZE,1,wavfile);
tom_coxon	0:1f4b7aa80ab3	184	if (feof(wavfile)) {
tom_coxon	0:1f4b7aa80ab3	185	printf("Oops -- not enough slices in the wave file\r\n");
tom_coxon	1:22c43c468a2f	186
tom_coxon	1:22c43c468a2f	187	break;
tom_coxon	0:1f4b7aa80ab3	188	}
tom_coxon	1:22c43c468a2f	189
tom_coxon	0:1f4b7aa80ab3	190	data_sptr=(short *)slice_buf;
tom_coxon	0:1f4b7aa80ab3	191	for (i=0;i<SLICE_BUF_SIZE;i++) {
tom_coxon	0:1f4b7aa80ab3	192	dac_data=0;
tom_coxon	0:1f4b7aa80ab3	193
tom_coxon	0:1f4b7aa80ab3	194	// for a stereo wave file average the two channels.
tom_coxon	0:1f4b7aa80ab3	195	for (channel=0;channel<wav_format.num_channels;channel++) {
tom_coxon	0:1f4b7aa80ab3	196	switch (wav_format.sig_bps) {
tom_coxon	0:1f4b7aa80ab3	197	case 16:
tom_coxon	0:1f4b7aa80ab3	198	dac_data+=( ((int)(*data_sptr++)) +32768 );
tom_coxon	0:1f4b7aa80ab3	199	break;
tom_coxon	0:1f4b7aa80ab3	200	case 8:
tom_coxon	0:1f4b7aa80ab3	201	dac_data+=( ((int)(*data_sptr++)) +32768 <<8);
tom_coxon	0:1f4b7aa80ab3	202	break;
tom_coxon	0:1f4b7aa80ab3	203	}
tom_coxon	0:1f4b7aa80ab3	204	}
tom_coxon	0:1f4b7aa80ab3	205	DAC_fifo[DAC_wptr]=dac_data;
tom_coxon	0:1f4b7aa80ab3	206	DAC_wptr=(DAC_wptr+1) & 0xff;
tom_coxon	0:1f4b7aa80ab3	207	while (DAC_wptr==DAC_rptr) {
tom_coxon	0:1f4b7aa80ab3	208	led1=1;
tom_coxon	0:1f4b7aa80ab3	209	wait_us(10);
tom_coxon	0:1f4b7aa80ab3	210	}
tom_coxon	0:1f4b7aa80ab3	211	led1=0;
tom_coxon	0:1f4b7aa80ab3	212	}
tom_coxon	0:1f4b7aa80ab3	213	}
tom_coxon	0:1f4b7aa80ab3	214	DAC_on=0;
tom_coxon	0:1f4b7aa80ab3	215	led2=0;
tom_coxon	0:1f4b7aa80ab3	216	tick.detach();
tom_coxon	0:1f4b7aa80ab3	217	printf("Ticker detached\r\n");
tom_coxon	0:1f4b7aa80ab3	218	led3=1;
tom_coxon	0:1f4b7aa80ab3	219	free(slice_buf);
tom_coxon	0:1f4b7aa80ab3	220	break;
tom_coxon	0:1f4b7aa80ab3	221	case 0x5453494c:
tom_coxon	0:1f4b7aa80ab3	222	printf("INFO chunk, size %d\r\n",chunk_size);
tom_coxon	0:1f4b7aa80ab3	223	fseek(wavfile,chunk_size,SEEK_CUR);
tom_coxon	0:1f4b7aa80ab3	224	break;
tom_coxon	0:1f4b7aa80ab3	225	default:
tom_coxon	0:1f4b7aa80ab3	226	printf("unknown chunk type 0x%x, size %d\r\n",chunk_id,chunk_size);
tom_coxon	0:1f4b7aa80ab3	227	data=fseek(wavfile,chunk_size,SEEK_CUR);
tom_coxon	0:1f4b7aa80ab3	228	break;
tom_coxon	0:1f4b7aa80ab3	229	}
tom_coxon	0:1f4b7aa80ab3	230	fread(&chunk_id,4,1,wavfile);
tom_coxon	0:1f4b7aa80ab3	231	fread(&chunk_size,4,1,wavfile);
tom_coxon	0:1f4b7aa80ab3	232	}
tom_coxon	0:1f4b7aa80ab3	233	printf("++++++++++++ Done with wave file ++++++++++\r\n");
tom_coxon	0:1f4b7aa80ab3	234	fclose(wavfile);
tom_coxon	0:1f4b7aa80ab3	235	led1=0;
tom_coxon	0:1f4b7aa80ab3	236	}
tom_coxon	0:1f4b7aa80ab3	237
tom_coxon	0:1f4b7aa80ab3	238
tom_coxon	0:1f4b7aa80ab3	239	void dac_out() {
tom_coxon	0:1f4b7aa80ab3	240	if (DAC_on) {
tom_coxon	0:1f4b7aa80ab3	241	led4=1;
tom_coxon	0:1f4b7aa80ab3	242	DACout.write_u16(DAC_fifo[DAC_rptr]);
tom_coxon	0:1f4b7aa80ab3	243	DAC_rptr=(DAC_rptr+1) & 0xff;
tom_coxon	0:1f4b7aa80ab3	244	led4=0;
tom_coxon	0:1f4b7aa80ab3	245	}
tom_coxon	0:1f4b7aa80ab3	246	}
tom_coxon	0:1f4b7aa80ab3	247
tom_coxon	0:1f4b7aa80ab3	248

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	03 Jul 2010
Imports:	48
Forks:	0
Commits:	3
Dependents:	0
Dependencies:	1
Followers:	1

main.cpp@1:22c43c468a2f, 2010-07-09 (annotated)

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