TwitteringBilly - Twittering Billy Bass plays back samples and look…

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Simon Ford / Mbed 2 deprecated TwitteringBilly

Twittering Billy Bass plays back samples and looks out for and reads twitters!

billy.cpp@1:27b1efbf5a46, 2011-04-09 (annotated)

Committer:: simon
Date:: Sat Apr 09 08:35:20 2011 +0000
Revision:: 1:27b1efbf5a46
Parent:: 0:ad2574c88043

Who changed what in which revision?

User	Revision	Line number	New contents of line
simon	1:27b1efbf5a46	1	// Original core billy player code factored from Steve Ravet's Big Mouth Billy Bass
simon	1:27b1efbf5a46	2	// - See http://mbed.org/cookbook/Big-Mouth-Billy-Bass
simon	1:27b1efbf5a46	3
simon	0:ad2574c88043	4	#include "billy.h"
simon	0:ad2574c88043	5
simon	0:ad2574c88043	6	#include "mbed.h"
simon	0:ad2574c88043	7
simon	0:ad2574c88043	8	#define SAMPLE_FREQ 40000
simon	0:ad2574c88043	9	#define BUF_SIZE (SAMPLE_FREQ/10)
simon	0:ad2574c88043	10	#define SLICE_BUF_SIZE 1
simon	0:ad2574c88043	11	#define USE_PUSHBUTTON 1
simon	0:ad2574c88043	12
simon	0:ad2574c88043	13	typedef struct uFMT_STRUCT {
simon	0:ad2574c88043	14	short comp_code;
simon	0:ad2574c88043	15	short num_channels;
simon	0:ad2574c88043	16	unsigned sample_rate;
simon	0:ad2574c88043	17	unsigned avg_Bps;
simon	0:ad2574c88043	18	short block_align;
simon	0:ad2574c88043	19	short sig_bps;
simon	0:ad2574c88043	20	} FMT_STRUCT;
simon	0:ad2574c88043	21
simon	0:ad2574c88043	22	typedef struct uMOV_STRUCT {
simon	0:ad2574c88043	23	long sample;
simon	0:ad2574c88043	24	unsigned motor;
simon	0:ad2574c88043	25	unsigned duty_cycle;
simon	0:ad2574c88043	26	unsigned played;
simon	0:ad2574c88043	27	} MOV_STRUCT;
simon	0:ad2574c88043	28
simon	0:ad2574c88043	29	// Billy's i/o
simon	0:ad2574c88043	30	AnalogOut DACout(p18);
simon	0:ad2574c88043	31	PwmOut body(p21);
simon	0:ad2574c88043	32	PwmOut mouth(p22);
simon	0:ad2574c88043	33	PwmOut tail(p23);
simon	0:ad2574c88043	34	Ticker tick;
simon	0:ad2574c88043	35
simon	0:ad2574c88043	36	// global variables used both by the main program and the ISR
simon	0:ad2574c88043	37	short DAC_fifo[256]; // FIFO for the DAC
simon	0:ad2574c88043	38	short DAC_wptr; // FIFO pointer
simon	0:ad2574c88043	39	volatile short DAC_rptr; // FIFO pointer
simon	0:ad2574c88043	40	long slice;
simon	0:ad2574c88043	41	unsigned num_movements;
simon	0:ad2574c88043	42	unsigned current_movement;
simon	0:ad2574c88043	43	MOV_STRUCT movements[500];
simon	0:ad2574c88043	44
simon	0:ad2574c88043	45	void dac_out(void);
simon	0:ad2574c88043	46	unsigned process_movement_file (char mfname, MOV_STRUCT mv,unsigned samp_rate);
simon	0:ad2574c88043	47
simon	0:ad2574c88043	48	void billy_play(char wavname, char movname) {
simon	0:ad2574c88043	49	unsigned chunk_id,chunk_size,channel;
simon	0:ad2574c88043	50	unsigned data,samp_int,i;
simon	0:ad2574c88043	51	short dac_data;
simon	0:ad2574c88043	52	char *slice_buf;
simon	0:ad2574c88043	53	short *data_sptr;
simon	0:ad2574c88043	54	unsigned char *data_bptr;
simon	0:ad2574c88043	55	int *data_wptr;
simon	0:ad2574c88043	56	FMT_STRUCT wav_format;
simon	0:ad2574c88043	57	FILE *wavfile;
simon	0:ad2574c88043	58	long num_slices;
simon	0:ad2574c88043	59	long long slice_value;
simon	0:ad2574c88043	60	int verbosity=0;
simon	0:ad2574c88043	61	DAC_wptr=0;
simon	0:ad2574c88043	62	DAC_rptr=0;
simon	0:ad2574c88043	63	for (i=0;i<256;i+=2) {
simon	0:ad2574c88043	64	DAC_fifo[i]=0;
simon	0:ad2574c88043	65	DAC_fifo[i+1]=3000;
simon	0:ad2574c88043	66	}
simon	0:ad2574c88043	67	DAC_wptr=4;
simon	0:ad2574c88043	68
simon	0:ad2574c88043	69	body.period_us(100);
simon	0:ad2574c88043	70	mouth.period_us(100);
simon	0:ad2574c88043	71	tail.period_us(100);
simon	0:ad2574c88043	72
simon	0:ad2574c88043	73	printf("Playing wave file '%s', mov file '%s'\n",wavname, movname);
simon	0:ad2574c88043	74
simon	0:ad2574c88043	75	wavfile=fopen(wavname,"rb");
simon	0:ad2574c88043	76	if (!wavfile) {
simon	0:ad2574c88043	77	printf("Unable to open wav file '%s'\n",wavname);
simon	0:ad2574c88043	78	return;
simon	0:ad2574c88043	79	}
simon	0:ad2574c88043	80
simon	0:ad2574c88043	81	fread(&chunk_id,4,1,wavfile);
simon	0:ad2574c88043	82	fread(&chunk_size,4,1,wavfile);
simon	0:ad2574c88043	83	while (!feof(wavfile)) {
simon	0:ad2574c88043	84	printf("Read chunk ID 0x%x, size 0x%x\n",chunk_id,chunk_size);
simon	0:ad2574c88043	85	switch (chunk_id) {
simon	0:ad2574c88043	86	case 0x46464952:
simon	0:ad2574c88043	87	fread(&data,4,1,wavfile);
simon	0:ad2574c88043	88	printf("RIFF chunk\n");
simon	0:ad2574c88043	89	printf(" chunk size %d (0x%x)\n",chunk_size,chunk_size);
simon	0:ad2574c88043	90	printf(" RIFF type 0x%x\n",data);
simon	0:ad2574c88043	91	break;
simon	0:ad2574c88043	92	case 0x20746d66:
simon	0:ad2574c88043	93	fread(&wav_format,sizeof(wav_format),1,wavfile);
simon	0:ad2574c88043	94	printf("FORMAT chunk\n");
simon	0:ad2574c88043	95	printf(" chunk size %d (0x%x)\n",chunk_size,chunk_size);
simon	0:ad2574c88043	96	printf(" compression code %d\n",wav_format.comp_code);
simon	0:ad2574c88043	97	printf(" %d channels\n",wav_format.num_channels);
simon	0:ad2574c88043	98	printf(" %d samples/sec\n",wav_format.sample_rate);
simon	0:ad2574c88043	99	printf(" %d bytes/sec\n",wav_format.avg_Bps);
simon	0:ad2574c88043	100	printf(" block align %d\n",wav_format.block_align);
simon	0:ad2574c88043	101	printf(" %d bits per sample\n",wav_format.sig_bps);
simon	0:ad2574c88043	102	if (chunk_size > sizeof(wav_format))
simon	0:ad2574c88043	103	fseek(wavfile,chunk_size-sizeof(wav_format),SEEK_CUR);
simon	0:ad2574c88043	104	// create a slice buffer large enough to hold multiple slices
simon	0:ad2574c88043	105	slice_buf=(char )malloc(wav_format.block_alignSLICE_BUF_SIZE);
simon	0:ad2574c88043	106	if (!slice_buf) {
simon	0:ad2574c88043	107	printf("Unable to malloc slice buffer");
simon	0:ad2574c88043	108	exit(1);
simon	0:ad2574c88043	109	}
simon	0:ad2574c88043	110	// now that the sample rate is known, process the movement file
simon	0:ad2574c88043	111	num_movements=process_movement_file(movname,movements,wav_format.sample_rate);
simon	0:ad2574c88043	112	break;
simon	0:ad2574c88043	113
simon	0:ad2574c88043	114	case 0x61746164:
simon	0:ad2574c88043	115	slice_buf=(char )malloc(wav_format.block_alignSLICE_BUF_SIZE);
simon	0:ad2574c88043	116	if (!slice_buf) {
simon	0:ad2574c88043	117	printf("Unable to malloc slice buffer");
simon	0:ad2574c88043	118	exit(1);
simon	0:ad2574c88043	119	}
simon	0:ad2574c88043	120	num_slices=chunk_size/wav_format.block_align;
simon	0:ad2574c88043	121	printf("DATA chunk\n");
simon	0:ad2574c88043	122	printf(" chunk size %d (0x%x)\n",chunk_size,chunk_size);
simon	0:ad2574c88043	123	printf(" %d slices\n",num_slices);
simon	0:ad2574c88043	124	printf(" Ideal sample interval=%d\n",(unsigned)(1000000.0/wav_format.sample_rate));
simon	0:ad2574c88043	125	samp_int=1000000/(wav_format.sample_rate);
simon	0:ad2574c88043	126
simon	0:ad2574c88043	127	printf(" programmed interrupt tick interval=%d\n",samp_int);
simon	0:ad2574c88043	128
simon	0:ad2574c88043	129	// starting up ticker to write samples out -- no printfs until tick.detach is called
simon	0:ad2574c88043	130	current_movement = 0;
simon	0:ad2574c88043	131	tick.attach_us(&dac_out, samp_int);
simon	0:ad2574c88043	132	//led2=1;
simon	0:ad2574c88043	133	for (slice=0;slice<num_slices;slice+=SLICE_BUF_SIZE) {
simon	0:ad2574c88043	134	fread(slice_buf,wav_format.block_align*SLICE_BUF_SIZE,1,wavfile);
simon	0:ad2574c88043	135	if (feof(wavfile)) {
simon	0:ad2574c88043	136	printf("Oops -- not enough slices in the wave file\n");
simon	0:ad2574c88043	137	exit(1);
simon	0:ad2574c88043	138	}
simon	0:ad2574c88043	139	data_sptr=(short *)slice_buf;
simon	0:ad2574c88043	140	data_bptr=(unsigned char *)slice_buf;
simon	0:ad2574c88043	141	data_wptr=(int *)slice_buf;
simon	0:ad2574c88043	142	slice_value=0;
simon	0:ad2574c88043	143	for (i=0;i<SLICE_BUF_SIZE;i++) {
simon	0:ad2574c88043	144	for (channel=0;channel<wav_format.num_channels;channel++) {
simon	0:ad2574c88043	145	switch (wav_format.sig_bps) {
simon	0:ad2574c88043	146	case 16:
simon	0:ad2574c88043	147	if (verbosity)
simon	0:ad2574c88043	148	printf("16 bit channel %d data=%d ",channel,data_sptr[channel]);
simon	0:ad2574c88043	149	slice_value+=data_sptr[channel];
simon	0:ad2574c88043	150	break;
simon	0:ad2574c88043	151	case 32:
simon	0:ad2574c88043	152	if (verbosity)
simon	0:ad2574c88043	153	printf("32 bit channel %d data=%d ",channel,data_wptr[channel]);
simon	0:ad2574c88043	154	slice_value+=data_wptr[channel];
simon	0:ad2574c88043	155	break;
simon	0:ad2574c88043	156	case 8:
simon	0:ad2574c88043	157	if (verbosity)
simon	0:ad2574c88043	158	printf("8 bit channel %d data=%d ",channel,(int)data_bptr[channel]);
simon	0:ad2574c88043	159	slice_value+=data_bptr[channel];
simon	0:ad2574c88043	160	break;
simon	0:ad2574c88043	161	}
simon	0:ad2574c88043	162	}
simon	0:ad2574c88043	163	slice_value/=wav_format.num_channels;
simon	0:ad2574c88043	164
simon	0:ad2574c88043	165	// slice_value is now averaged. Next it needs to be scaled to an unsigned 16 bit value
simon	0:ad2574c88043	166	// with DC offset so it can be written to the DAC.
simon	0:ad2574c88043	167	switch (wav_format.sig_bps) {
simon	0:ad2574c88043	168	case 8:
simon	0:ad2574c88043	169	slice_value<<=8;
simon	0:ad2574c88043	170	break;
simon	0:ad2574c88043	171	case 16:
simon	0:ad2574c88043	172	slice_value+=32768;
simon	0:ad2574c88043	173	break;
simon	0:ad2574c88043	174	case 32:
simon	0:ad2574c88043	175	slice_value>>=16;
simon	0:ad2574c88043	176	slice_value+=32768;
simon	0:ad2574c88043	177	break;
simon	0:ad2574c88043	178	}
simon	0:ad2574c88043	179	dac_data=(short unsigned )slice_value;
simon	0:ad2574c88043	180	if (verbosity)
simon	0:ad2574c88043	181	printf("sample %d wptr %d slice_value %d dac_data %u\n",slice,DAC_wptr,(int)slice_value,dac_data);
simon	0:ad2574c88043	182
simon	0:ad2574c88043	183	// finally stick it in the DAC FIFO. If the write pointer wraps around and meets the read pointer
simon	0:ad2574c88043	184	// the wait until the read pointer moves.
simon	0:ad2574c88043	185	DAC_fifo[DAC_wptr]=dac_data;
simon	0:ad2574c88043	186	DAC_wptr=(DAC_wptr+1) & 0xff;
simon	0:ad2574c88043	187	while (DAC_wptr==DAC_rptr) {
simon	0:ad2574c88043	188	}
simon	0:ad2574c88043	189	}
simon	0:ad2574c88043	190	}
simon	0:ad2574c88043	191
simon	0:ad2574c88043	192	// wait for ISR to drain FIFO
simon	0:ad2574c88043	193	wait_us(300);
simon	0:ad2574c88043	194	tick.detach();
simon	0:ad2574c88043	195	printf("Ticker detached\n");
simon	0:ad2574c88043	196	free(slice_buf);
simon	0:ad2574c88043	197	break;
simon	0:ad2574c88043	198	case 0x5453494c:
simon	0:ad2574c88043	199	printf("INFO chunk, size %d\n",chunk_size);
simon	0:ad2574c88043	200	fseek(wavfile,chunk_size,SEEK_CUR);
simon	0:ad2574c88043	201	break;
simon	0:ad2574c88043	202	default:
simon	0:ad2574c88043	203	printf("unknown chunk type 0x%x, size %d\n",chunk_id,chunk_size);
simon	0:ad2574c88043	204	data=fseek(wavfile,chunk_size,SEEK_CUR);
simon	0:ad2574c88043	205	break;
simon	0:ad2574c88043	206	}
simon	0:ad2574c88043	207	fread(&chunk_id,4,1,wavfile);
simon	0:ad2574c88043	208	fread(&chunk_size,4,1,wavfile);
simon	0:ad2574c88043	209	}
simon	0:ad2574c88043	210	printf("Done with wave file\n");
simon	0:ad2574c88043	211	fclose(wavfile);
simon	0:ad2574c88043	212	body.pulsewidth_us(0);
simon	0:ad2574c88043	213	mouth.pulsewidth_us(0);
simon	0:ad2574c88043	214	tail.pulsewidth_us(0);
simon	0:ad2574c88043	215	}
simon	0:ad2574c88043	216
simon	0:ad2574c88043	217	void dac_out() {
simon	0:ad2574c88043	218	if (!movements[current_movement].played) {
simon	0:ad2574c88043	219	if (movements[current_movement].sample<=slice) {
simon	0:ad2574c88043	220	if (movements[current_movement].motor==0) body.pulsewidth_us(movements[current_movement].duty_cycle);
simon	0:ad2574c88043	221	if (movements[current_movement].motor==1) mouth.pulsewidth_us(movements[current_movement].duty_cycle);
simon	0:ad2574c88043	222	if (movements[current_movement].motor==2) tail.pulsewidth_us(movements[current_movement].duty_cycle);
simon	0:ad2574c88043	223	movements[current_movement].played=1;
simon	0:ad2574c88043	224	current_movement++;
simon	0:ad2574c88043	225	}
simon	0:ad2574c88043	226	}
simon	0:ad2574c88043	227	DACout.write_u16(DAC_fifo[DAC_rptr]);
simon	0:ad2574c88043	228	DAC_rptr=(DAC_rptr+1) & 0xff;
simon	0:ad2574c88043	229	}
simon	0:ad2574c88043	230
simon	0:ad2574c88043	231	unsigned process_movement_file(char mfname, MOV_STRUCT mv,unsigned samp_rate) {
simon	0:ad2574c88043	232	FILE *movfile;
simon	0:ad2574c88043	233	char line[100],*tmp;
simon	0:ad2574c88043	234	unsigned num_movements,i,j,x;
simon	0:ad2574c88043	235	movfile=fopen(mfname,"rb");
simon	0:ad2574c88043	236	if (!movfile) {
simon	0:ad2574c88043	237	printf("Unable to open mov file '%s'\n",mfname);
simon	0:ad2574c88043	238	return 0;
simon	0:ad2574c88043	239	}
simon	0:ad2574c88043	240
simon	0:ad2574c88043	241	fgets(line,100,movfile);
simon	0:ad2574c88043	242	num_movements=0;
simon	0:ad2574c88043	243	#ifdef VERBOSE
simon	0:ad2574c88043	244	printf("Motor report...\n");
simon	0:ad2574c88043	245	#endif
simon	0:ad2574c88043	246	while (!feof(movfile)) {
simon	0:ad2574c88043	247	if (line[0]!='#') {
simon	0:ad2574c88043	248	tmp=line;
simon	0:ad2574c88043	249	// first thing on line is time in ms
simon	0:ad2574c88043	250	movements[num_movements].sample=(atol(tmp)*samp_rate)/1000;
simon	0:ad2574c88043	251	// skip digits (non whitespace)
simon	0:ad2574c88043	252	tmp=line;
simon	0:ad2574c88043	253	while (tmp!=' ' && tmp!='\t' && *tmp!=0)
simon	0:ad2574c88043	254	tmp++;
simon	0:ad2574c88043	255	// skip whitespace
simon	0:ad2574c88043	256	while ((tmp==' ' \| tmp=='\t') && *tmp!=0)
simon	0:ad2574c88043	257	tmp++;
simon	0:ad2574c88043	258	if (strstr(tmp,"body"))
simon	0:ad2574c88043	259	movements[num_movements].motor=0;
simon	0:ad2574c88043	260	if (strstr(tmp,"mouth"))
simon	0:ad2574c88043	261	movements[num_movements].motor=1;
simon	0:ad2574c88043	262	if (strstr(tmp,"tail"))
simon	0:ad2574c88043	263	movements[num_movements].motor=2;
simon	0:ad2574c88043	264	// skip letters (non whitespace)
simon	0:ad2574c88043	265	while (tmp!=' ' && tmp!='\t')
simon	0:ad2574c88043	266	tmp++;
simon	0:ad2574c88043	267	// skip whitespace
simon	0:ad2574c88043	268	while (tmp==' ' \| tmp=='\t')
simon	0:ad2574c88043	269	tmp++;
simon	0:ad2574c88043	270	if (tmp)
simon	0:ad2574c88043	271	movements[num_movements].duty_cycle=atoi(tmp);
simon	0:ad2574c88043	272	movements[num_movements].played=0;
simon	0:ad2574c88043	273	#ifdef VERBOSE
simon	0:ad2574c88043	274	printf(" moving motor %d at sample %ld with duty cycle %d\n",movements[num_movements].motor,movements[num_movements].sample,movements[num_movements].duty_cycle);
simon	0:ad2574c88043	275	#endif
simon	0:ad2574c88043	276	num_movements++;
simon	0:ad2574c88043	277	}
simon	0:ad2574c88043	278	fgets(line,100,movfile);
simon	0:ad2574c88043	279	}
simon	0:ad2574c88043	280	printf(" %d movements read\n",num_movements);
simon	0:ad2574c88043	281	printf(" sorting movements...");
simon	0:ad2574c88043	282	for (i=0;i<num_movements;i++) {
simon	0:ad2574c88043	283	for (j=i;j<num_movements;j++) {
simon	0:ad2574c88043	284	if (movements[j].sample < movements[i].sample) {
simon	0:ad2574c88043	285	x=movements[i].sample;
simon	0:ad2574c88043	286	movements[i].sample=movements[j].sample;
simon	0:ad2574c88043	287	movements[j].sample=x;
simon	0:ad2574c88043	288	x=movements[i].motor ;
simon	0:ad2574c88043	289	movements[i].motor =movements[j].motor ;
simon	0:ad2574c88043	290	movements[j].motor =x;
simon	0:ad2574c88043	291	x=movements[i].duty_cycle;
simon	0:ad2574c88043	292	movements[i].duty_cycle=movements[j].duty_cycle;
simon	0:ad2574c88043	293	movements[j].duty_cycle=x;
simon	0:ad2574c88043	294	}
simon	0:ad2574c88043	295	}
simon	0:ad2574c88043	296	}
simon	0:ad2574c88043	297	printf("done\n");
simon	0:ad2574c88043	298	fclose(movfile);
simon	0:ad2574c88043	299	return num_movements;
simon	0:ad2574c88043	300	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	06 Apr 2011
Imports:	33
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	3
Followers:	2

billy.cpp@1:27b1efbf5a46, 2011-04-09 (annotated)

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