Martin Yeh / Mbed 2 deprecated Karaoke

Karaoke Machine

Dependencies:   SDFileSystem mbed-rtos mbed

main.cpp@0:1d4e1f997a95, 2015-12-07 (annotated)

Committer:
myeh
Date:
Mon Dec 07 20:36:22 2015 +0000
Revision:
0:1d4e1f997a95
This is the code for a karaoke machine

Who changed what in which revision?

UserRevisionLine numberNew contents of line
myeh 0:1d4e1f997a95 1 #include "SDFileSystem.h"
myeh 0:1d4e1f997a95 2 #include "rtos.h"
myeh 0:1d4e1f997a95 3 #include "mbed.h"
myeh 0:1d4e1f997a95 4
myeh 0:1d4e1f997a95 5 typedef struct uFMT_STRUCT {
myeh 0:1d4e1f997a95 6 short comp_code;
myeh 0:1d4e1f997a95 7 short num_channels;
myeh 0:1d4e1f997a95 8 unsigned voice_rate;
myeh 0:1d4e1f997a95 9 unsigned avg_Bps;
myeh 0:1d4e1f997a95 10 short block_align;
myeh 0:1d4e1f997a95 11 short sig_bps;
myeh 0:1d4e1f997a95 12 } FMT_STRUCT;
myeh 0:1d4e1f997a95 13
myeh 0:1d4e1f997a95 14 class wave_player {
myeh 0:1d4e1f997a95 15
myeh 0:1d4e1f997a95 16 public:
myeh 0:1d4e1f997a95 17 /** Create a wave player using a pointer to the given AnalogOut object.
myeh 0:1d4e1f997a95 18 *
myeh 0:1d4e1f997a95 19 * @param _dac pointer to an AnalogOut object to which the voices are sent.
myeh 0:1d4e1f997a95 20 */
myeh 0:1d4e1f997a95 21 wave_player(AnalogOut *_dac);
myeh 0:1d4e1f997a95 22 void play(FILE *wavefile);
myeh 0:1d4e1f997a95 23 void set_verbosity(int v);
myeh 0:1d4e1f997a95 24
myeh 0:1d4e1f997a95 25 /** the player function.
myeh 0:1d4e1f997a95 26 *
myeh 0:1d4e1f997a95 27 * @param wavefile A pointer to an opened wave file
myeh 0:1d4e1f997a95 28 */
myeh 0:1d4e1f997a95 29
myeh 0:1d4e1f997a95 30 /** Set the printf verbosity of the wave player. A nonzero verbosity level
myeh 0:1d4e1f997a95 31 * will put wave_player in a mode where the complete contents of the wave
myeh 0:1d4e1f997a95 32 * file are echoed to the screen, including header values, and including
myeh 0:1d4e1f997a95 33 * all of the voice values placed into the DAC FIFO, and the voice values
myeh 0:1d4e1f997a95 34 * removed from the DAC FIFO by the ISR. The voice output frequency is
myeh 0:1d4e1f997a95 35 * fixed at 2 Hz in this mode, so it's all very slow and the DAC output isn't
myeh 0:1d4e1f997a95 36 * very useful, but it lets you see what's going on and may help for debugging
myeh 0:1d4e1f997a95 37 * wave files that don't play correctly.
myeh 0:1d4e1f997a95 38 *
myeh 0:1d4e1f997a95 39 * @param v the verbosity level
myeh 0:1d4e1f997a95 40 */
myeh 0:1d4e1f997a95 41 private:
myeh 0:1d4e1f997a95 42 void dac_out(void);
myeh 0:1d4e1f997a95 43 int verbosity;
myeh 0:1d4e1f997a95 44 AnalogOut *wave_DAC;
myeh 0:1d4e1f997a95 45 Ticker tick;
myeh 0:1d4e1f997a95 46 unsigned short DAC_fifo[256];
myeh 0:1d4e1f997a95 47 short DAC_wptr;
myeh 0:1d4e1f997a95 48 volatile short DAC_rptr;
myeh 0:1d4e1f997a95 49 short DAC_on;
myeh 0:1d4e1f997a95 50 };
myeh 0:1d4e1f997a95 51
myeh 0:1d4e1f997a95 52 wave_player::wave_player(AnalogOut *_dac)
myeh 0:1d4e1f997a95 53 {
myeh 0:1d4e1f997a95 54 wave_DAC=_dac;
myeh 0:1d4e1f997a95 55 wave_DAC->write_u16(32768); //DAC is 0-3.3V, so idles at ~1.6V
myeh 0:1d4e1f997a95 56 verbosity=0;
myeh 0:1d4e1f997a95 57 }
myeh 0:1d4e1f997a95 58
myeh 0:1d4e1f997a95 59 //-----------------------------------------------------------------------------
myeh 0:1d4e1f997a95 60 // if verbosity is set then wave player enters a mode where the wave file
myeh 0:1d4e1f997a95 61 // is decoded and displayed to the screen, including voice values put into
myeh 0:1d4e1f997a95 62 // the DAC FIFO, and values read out of the DAC FIFO by the ISR. The DAC output
myeh 0:1d4e1f997a95 63 // itself is so slow as to be unusable, but this might be handy for debugging
myeh 0:1d4e1f997a95 64 // wave files that don't play
myeh 0:1d4e1f997a95 65 //-----------------------------------------------------------------------------
myeh 0:1d4e1f997a95 66 void wave_player::set_verbosity(int v)
myeh 0:1d4e1f997a95 67 {
myeh 0:1d4e1f997a95 68 verbosity=v;
myeh 0:1d4e1f997a95 69 }
myeh 0:1d4e1f997a95 70
myeh 0:1d4e1f997a95 71 //-----------------------------------------------------------------------------
myeh 0:1d4e1f997a95 72 // player function. Takes a pointer to an opened wave file. The file needs
myeh 0:1d4e1f997a95 73 // to be stored in a filesystem with enough bandwidth to feed the wave data.
myeh 0:1d4e1f997a95 74 // LocalFileSystem isn't, but the SDcard is, at least for 22kHz files. The
myeh 0:1d4e1f997a95 75 // SDcard filesystem can be hotrodded by increasing the SPI frequency it uses
myeh 0:1d4e1f997a95 76 // internally.
myeh 0:1d4e1f997a95 77 //-----------------------------------------------------------------------------
myeh 0:1d4e1f997a95 78 void wave_player::play(FILE *wavefile)
myeh 0:1d4e1f997a95 79 {
myeh 0:1d4e1f997a95 80 unsigned chunk_id,chunk_size,channel;
myeh 0:1d4e1f997a95 81 unsigned data,samp_int,i;
myeh 0:1d4e1f997a95 82 short unsigned dac_data;
myeh 0:1d4e1f997a95 83 long long slice_value;
myeh 0:1d4e1f997a95 84 char *slice_buf;
myeh 0:1d4e1f997a95 85 short *data_sptr;
myeh 0:1d4e1f997a95 86 unsigned char *data_bptr;
myeh 0:1d4e1f997a95 87 int *data_wptr;
myeh 0:1d4e1f997a95 88 FMT_STRUCT wav_format;
myeh 0:1d4e1f997a95 89 long slice,num_slices;
myeh 0:1d4e1f997a95 90 DAC_wptr=0;
myeh 0:1d4e1f997a95 91 DAC_rptr=0;
myeh 0:1d4e1f997a95 92 for (i=0;i<256;i+=2) {
myeh 0:1d4e1f997a95 93 DAC_fifo[i]=0;
myeh 0:1d4e1f997a95 94 DAC_fifo[i+1]=3000;
myeh 0:1d4e1f997a95 95 }
myeh 0:1d4e1f997a95 96 DAC_wptr=4;
myeh 0:1d4e1f997a95 97 DAC_on=0;
myeh 0:1d4e1f997a95 98
myeh 0:1d4e1f997a95 99 fread(&chunk_id,4,1,wavefile);
myeh 0:1d4e1f997a95 100 fread(&chunk_size,4,1,wavefile);
myeh 0:1d4e1f997a95 101 while (!feof(wavefile)) {
myeh 0:1d4e1f997a95 102 if (verbosity)
myeh 0:1d4e1f997a95 103 printf("Read chunk ID 0x%x, size 0x%x\n",chunk_id,chunk_size);
myeh 0:1d4e1f997a95 104 switch (chunk_id) {
myeh 0:1d4e1f997a95 105 case 0x46464952:
myeh 0:1d4e1f997a95 106 fread(&data,4,1,wavefile);
myeh 0:1d4e1f997a95 107 if (verbosity) {
myeh 0:1d4e1f997a95 108 printf("RIFF chunk\n");
myeh 0:1d4e1f997a95 109 printf(" chunk size %d (0x%x)\n",chunk_size,chunk_size);
myeh 0:1d4e1f997a95 110 printf(" RIFF type 0x%x\n",data);
myeh 0:1d4e1f997a95 111 }
myeh 0:1d4e1f997a95 112 break;
myeh 0:1d4e1f997a95 113 case 0x20746d66:
myeh 0:1d4e1f997a95 114 fread(&wav_format,sizeof(wav_format),1,wavefile);
myeh 0:1d4e1f997a95 115 if (verbosity) {
myeh 0:1d4e1f997a95 116 printf("FORMAT chunk\n");
myeh 0:1d4e1f997a95 117 printf(" chunk size %d (0x%x)\n",chunk_size,chunk_size);
myeh 0:1d4e1f997a95 118 printf(" compression code %d\n",wav_format.comp_code);
myeh 0:1d4e1f997a95 119 printf(" %d channels\n",wav_format.num_channels);
myeh 0:1d4e1f997a95 120 printf(" %d voices/sec\n",wav_format.voice_rate);
myeh 0:1d4e1f997a95 121 printf(" %d bytes/sec\n",wav_format.avg_Bps);
myeh 0:1d4e1f997a95 122 printf(" block align %d\n",wav_format.block_align);
myeh 0:1d4e1f997a95 123 printf(" %d bits per voice\n",wav_format.sig_bps);
myeh 0:1d4e1f997a95 124 }
myeh 0:1d4e1f997a95 125 if (chunk_size > sizeof(wav_format))
myeh 0:1d4e1f997a95 126 fseek(wavefile,chunk_size-sizeof(wav_format),SEEK_CUR);
myeh 0:1d4e1f997a95 127 break;
myeh 0:1d4e1f997a95 128 case 0x61746164:
myeh 0:1d4e1f997a95 129 // allocate a buffer big enough to hold a slice
myeh 0:1d4e1f997a95 130 slice_buf=(char *)malloc(wav_format.block_align);
myeh 0:1d4e1f997a95 131 if (!slice_buf) {
myeh 0:1d4e1f997a95 132 printf("Unable to malloc slice buffer");
myeh 0:1d4e1f997a95 133 exit(1);
myeh 0:1d4e1f997a95 134 }
myeh 0:1d4e1f997a95 135 num_slices=chunk_size/wav_format.block_align;
myeh 0:1d4e1f997a95 136 samp_int=1000000/(wav_format.voice_rate);
myeh 0:1d4e1f997a95 137 if (verbosity) {
myeh 0:1d4e1f997a95 138 printf("DATA chunk\n");
myeh 0:1d4e1f997a95 139 printf(" chunk size %d (0x%x)\n",chunk_size,chunk_size);
myeh 0:1d4e1f997a95 140 printf(" %d slices\n",num_slices);
myeh 0:1d4e1f997a95 141 printf(" Ideal voice interval=%d\n",(unsigned)(1000000.0/wav_format.voice_rate));
myeh 0:1d4e1f997a95 142 printf(" programmed interrupt tick interval=%d\n",samp_int);
myeh 0:1d4e1f997a95 143 }
myeh 0:1d4e1f997a95 144
myeh 0:1d4e1f997a95 145 // starting up ticker to write voices out -- no printfs until tick.detach is called
myeh 0:1d4e1f997a95 146 if (verbosity)
myeh 0:1d4e1f997a95 147 tick.attach_us(this,&wave_player::dac_out, 500000);
myeh 0:1d4e1f997a95 148 else
myeh 0:1d4e1f997a95 149 tick.attach_us(this,&wave_player::dac_out, samp_int);
myeh 0:1d4e1f997a95 150 DAC_on=1;
myeh 0:1d4e1f997a95 151
myeh 0:1d4e1f997a95 152 // start reading slices, which contain one voice each for however many channels
myeh 0:1d4e1f997a95 153 // are in the wave file. one channel=mono, two channels=stereo, etc. Since
myeh 0:1d4e1f997a95 154 // mbed only has a single AnalogOut, all of the channels present are averaged
myeh 0:1d4e1f997a95 155 // to produce a single voice value. This summing and averaging happens in
myeh 0:1d4e1f997a95 156 // a variable of type signed long long, to make sure that the data doesn't
myeh 0:1d4e1f997a95 157 // overflow regardless of voice size (8 bits, 16 bits, 32 bits).
myeh 0:1d4e1f997a95 158 //
myeh 0:1d4e1f997a95 159 // note that from what I can find that 8 bit wave files use unsigned data,
myeh 0:1d4e1f997a95 160 // while 16 and 32 bit wave files use signed data
myeh 0:1d4e1f997a95 161 //
myeh 0:1d4e1f997a95 162 for (slice=0;slice<num_slices;slice+=1) {
myeh 0:1d4e1f997a95 163 fread(slice_buf,wav_format.block_align,1,wavefile);
myeh 0:1d4e1f997a95 164 if (feof(wavefile)) {
myeh 0:1d4e1f997a95 165 printf("Oops -- not enough slices in the wave file\n");
myeh 0:1d4e1f997a95 166 exit(1);
myeh 0:1d4e1f997a95 167 }
myeh 0:1d4e1f997a95 168 data_sptr=(short *)slice_buf; // 16 bit voices
myeh 0:1d4e1f997a95 169 data_bptr=(unsigned char *)slice_buf; // 8 bit voices
myeh 0:1d4e1f997a95 170 data_wptr=(int *)slice_buf; // 32 bit voices
myeh 0:1d4e1f997a95 171 slice_value=0;
myeh 0:1d4e1f997a95 172 for (channel=0;channel<wav_format.num_channels;channel++) {
myeh 0:1d4e1f997a95 173 switch (wav_format.sig_bps) {
myeh 0:1d4e1f997a95 174 case 16:
myeh 0:1d4e1f997a95 175 if (verbosity)
myeh 0:1d4e1f997a95 176 printf("16 bit channel %d data=%d ",channel,data_sptr[channel]);
myeh 0:1d4e1f997a95 177 slice_value+=data_sptr[channel];
myeh 0:1d4e1f997a95 178 break;
myeh 0:1d4e1f997a95 179 case 32:
myeh 0:1d4e1f997a95 180 if (verbosity)
myeh 0:1d4e1f997a95 181 printf("32 bit channel %d data=%d ",channel,data_wptr[channel]);
myeh 0:1d4e1f997a95 182 slice_value+=data_wptr[channel];
myeh 0:1d4e1f997a95 183 break;
myeh 0:1d4e1f997a95 184 case 8:
myeh 0:1d4e1f997a95 185 if (verbosity)
myeh 0:1d4e1f997a95 186 printf("8 bit channel %d data=%d ",channel,(int)data_bptr[channel]);
myeh 0:1d4e1f997a95 187 slice_value+=data_bptr[channel];
myeh 0:1d4e1f997a95 188 break;
myeh 0:1d4e1f997a95 189 }
myeh 0:1d4e1f997a95 190 }
myeh 0:1d4e1f997a95 191 slice_value/=wav_format.num_channels;
myeh 0:1d4e1f997a95 192
myeh 0:1d4e1f997a95 193 // slice_value is now averaged. Next it needs to be scaled to an unsigned 16 bit value
myeh 0:1d4e1f997a95 194 // with DC offset so it can be written to the DAC.
myeh 0:1d4e1f997a95 195 switch (wav_format.sig_bps) {
myeh 0:1d4e1f997a95 196 case 8: slice_value<<=8;
myeh 0:1d4e1f997a95 197 break;
myeh 0:1d4e1f997a95 198 case 16: slice_value+=32768;
myeh 0:1d4e1f997a95 199 break;
myeh 0:1d4e1f997a95 200 case 32: slice_value>>=16;
myeh 0:1d4e1f997a95 201 slice_value+=32768;
myeh 0:1d4e1f997a95 202 break;
myeh 0:1d4e1f997a95 203 }
myeh 0:1d4e1f997a95 204 dac_data=(short unsigned)slice_value;
myeh 0:1d4e1f997a95 205 if (verbosity)
myeh 0:1d4e1f997a95 206 printf("voice %d wptr %d slice_value %d dac_data %u\n",slice,DAC_wptr,(int)slice_value,dac_data);
myeh 0:1d4e1f997a95 207 DAC_fifo[DAC_wptr]=dac_data;
myeh 0:1d4e1f997a95 208 DAC_wptr=(DAC_wptr+1) & 0xff;
myeh 0:1d4e1f997a95 209 while (DAC_wptr==DAC_rptr) {
myeh 0:1d4e1f997a95 210 }
myeh 0:1d4e1f997a95 211 }
myeh 0:1d4e1f997a95 212 DAC_on=0;
myeh 0:1d4e1f997a95 213 tick.detach();
myeh 0:1d4e1f997a95 214 free(slice_buf);
myeh 0:1d4e1f997a95 215 break;
myeh 0:1d4e1f997a95 216 case 0x5453494c:
myeh 0:1d4e1f997a95 217 if (verbosity)
myeh 0:1d4e1f997a95 218 printf("INFO chunk, size %d\n",chunk_size);
myeh 0:1d4e1f997a95 219 fseek(wavefile,chunk_size,SEEK_CUR);
myeh 0:1d4e1f997a95 220 break;
myeh 0:1d4e1f997a95 221 default:
myeh 0:1d4e1f997a95 222 printf("unknown chunk type 0x%x, size %d\n",chunk_id,chunk_size);
myeh 0:1d4e1f997a95 223 data=fseek(wavefile,chunk_size,SEEK_CUR);
myeh 0:1d4e1f997a95 224 break;
myeh 0:1d4e1f997a95 225 }
myeh 0:1d4e1f997a95 226 fread(&chunk_id,4,1,wavefile);
myeh 0:1d4e1f997a95 227 fread(&chunk_size,4,1,wavefile);
myeh 0:1d4e1f997a95 228 }
myeh 0:1d4e1f997a95 229 }
myeh 0:1d4e1f997a95 230
myeh 0:1d4e1f997a95 231 BusOut myleds(LED1,LED2,LED3,LED4);
myeh 0:1d4e1f997a95 232 SDFileSystem sd(p5, p6, p7, p8, "sd");
myeh 0:1d4e1f997a95 233 AnalogOut speaker(p18);
myeh 0:1d4e1f997a95 234 wave_player waver(&speaker);
myeh 0:1d4e1f997a95 235 Serial pc(USBTX, USBRX);
myeh 0:1d4e1f997a95 236
myeh 0:1d4e1f997a95 237 DigitalOut P15(p15);
myeh 0:1d4e1f997a95 238 DigitalOut P16(p16);
myeh 0:1d4e1f997a95 239 DigitalOut P19(p19);
myeh 0:1d4e1f997a95 240 DigitalOut P20(p20);
myeh 0:1d4e1f997a95 241
myeh 0:1d4e1f997a95 242 unsigned short data;
myeh 0:1d4e1f997a95 243
myeh 0:1d4e1f997a95 244
myeh 0:1d4e1f997a95 245 class microphone
myeh 0:1d4e1f997a95 246 {
myeh 0:1d4e1f997a95 247 public :
myeh 0:1d4e1f997a95 248 microphone(PinName pin);
myeh 0:1d4e1f997a95 249 unsigned short read_u16();
myeh 0:1d4e1f997a95 250 operator unsigned short ();
myeh 0:1d4e1f997a95 251 private :
myeh 0:1d4e1f997a95 252 AnalogIn _pin;
myeh 0:1d4e1f997a95 253 };
myeh 0:1d4e1f997a95 254 microphone::microphone (PinName pin):
myeh 0:1d4e1f997a95 255 _pin(pin)
myeh 0:1d4e1f997a95 256 {
myeh 0:1d4e1f997a95 257 }
myeh 0:1d4e1f997a95 258 unsigned short microphone::read_u16()
myeh 0:1d4e1f997a95 259 {
myeh 0:1d4e1f997a95 260 return _pin.read_u16();
myeh 0:1d4e1f997a95 261 }
myeh 0:1d4e1f997a95 262 inline microphone::operator unsigned short ()
myeh 0:1d4e1f997a95 263 {
myeh 0:1d4e1f997a95 264 return _pin.read_u16();
myeh 0:1d4e1f997a95 265 }
myeh 0:1d4e1f997a95 266
myeh 0:1d4e1f997a95 267
myeh 0:1d4e1f997a95 268 microphone mymicrophone(p17);
myeh 0:1d4e1f997a95 269
myeh 0:1d4e1f997a95 270
myeh 0:1d4e1f997a95 271 int main()
myeh 0:1d4e1f997a95 272 {
myeh 0:1d4e1f997a95 273 while(1) {
myeh 0:1d4e1f997a95 274 FILE *wave_file;
myeh 0:1d4e1f997a95 275 wave_file=fopen("/sd/wavfiles/Yakko's World.wav","r");
myeh 0:1d4e1f997a95 276 waver.play(wave_file);
myeh 0:1d4e1f997a95 277 fclose(wave_file);
myeh 0:1d4e1f997a95 278 }
myeh 0:1d4e1f997a95 279 }
myeh 0:1d4e1f997a95 280
myeh 0:1d4e1f997a95 281 void wave_player::dac_out()
myeh 0:1d4e1f997a95 282 {
myeh 0:1d4e1f997a95 283 if (DAC_on) {
myeh 0:1d4e1f997a95 284 #ifdef VERBOSE
myeh 0:1d4e1f997a95 285 printf("ISR rdptr %d got %u\n",DAC_rptr,DAC_fifo[DAC_rptr]);
myeh 0:1d4e1f997a95 286 #endif
myeh 0:1d4e1f997a95 287 wave_DAC->write_u16((mymicrophone + DAC_fifo[DAC_rptr])/2);
myeh 0:1d4e1f997a95 288 DAC_rptr=(DAC_rptr+1) & 0xff;
myeh 0:1d4e1f997a95 289 }
myeh 0:1d4e1f997a95 290 }