VS1002.cpp

00001 #include "VS1002.h"
00002 #include "mbed.h"
00003 
00004 
00005 Serial pc(USBTX, USBRX);
00006 
00007 /* ==================================================================
00008  * Constructor
00009  * =================================================================*/
00010 VS1002::VS1002(
00011 PinName mmosi, PinName mmiso, PinName ssck, PinName ccs, const char *name,
00012          PinName mosi, PinName miso, PinName sck, PinName cs, PinName rst,
00013          PinName dreq, PinName dcs, PinName vol)
00014     :
00015      _sd(mmosi, mmiso, ssck, ccs, name),
00016      _spi(mosi, miso, sck), 
00017      _CS(cs), 
00018      _RST(rst), 
00019      _DREQ(dreq),
00020      _DCS(dcs), 
00021      _VOL(vol) {
00022     
00023     }    
00024 
00025 /*===================================================================
00026  * Functions
00027  *==================================================================*/
00028  
00029 void VS1002::cs_low(void)
00030 {
00031     _CS = 0;                                
00032 }
00033 void VS1002::cs_high(void)
00034 {
00035     _CS = 1;                                
00036 }
00037 void VS1002::dcs_low(void)
00038 {
00039     _DCS = 0;
00040 }
00041 void VS1002::dcs_high(void)
00042 {
00043     _DCS = 1;
00044 }
00045 void VS1002::sci_en(void)                    //SCI enable
00046 {
00047     cs_high();
00048     dcs_high();
00049     cs_low();
00050 }
00051 void VS1002::sci_dis(void)                    //SCI disable
00052 {
00053     cs_high();
00054 }
00055 void VS1002::sdi_en(void)                    //SDI enable
00056 {
00057     dcs_high();
00058     cs_high();
00059     dcs_low();
00060 }
00061 void VS1002::sdi_dis(void)                    //SDI disable
00062 {
00063     dcs_high();
00064 }
00065 void VS1002::reset(void)                    //hardware reset
00066 {
00067     wait(0.01);
00068     _RST = 0;
00069     wait(0.01);
00070     _RST = 1;
00071     wait(0.10);
00072 }
00073 void VS1002::power_down(void)                //hardware and software reset
00074 {
00075     cs_low();
00076     reset();
00077     sci_write(0x00, SM_PDOWN);
00078     wait(0.01);
00079     reset();
00080 }
00081 void VS1002::sci_initialise(void)
00082 {
00083     _RST = 1;                                //no reset
00084     _spi.format(8,0);                        //spi 8bit interface, steady state low
00085     _spi.frequency(1000000);                //rising edge data record, freq. 1Mhz
00086     
00087     cs_low();
00088     for(int i=0; i<4; i++)
00089     {
00090     _spi.write(0xFF);                        //clock the chip a bit
00091     }
00092     cs_high();
00093     dcs_high();
00094     wait_us(5);
00095 }
00096 void VS1002::sdi_initialise(void)
00097 {
00098     _spi.format(8,0);
00099     _spi.frequency(7000000);                //set to 7MHz
00100     
00101     cs_high();
00102     dcs_high();
00103 }
00104 void VS1002::sci_write(unsigned char address, unsigned short int data)
00105 {
00106     sci_en();                                //enables SCI/disables SDI
00107     
00108     while(!_DREQ);                            //wait unitl data request is high
00109     _spi.write(0x02);                        //SCI write
00110     _spi.write(address);                    //register address
00111     _spi.write((data >> 8) & 0xFF);            //write out first half of data word
00112     _spi.write(data & 0xFF);                //write out second half of data word
00113     
00114     sci_dis();                                //enables SDI/disables SCI
00115     wait_us(5);
00116 }
00117 void VS1002::sdi_write(unsigned char datum)
00118 {
00119     sdi_en();
00120     
00121     while(!_DREQ);
00122     _spi.write(datum);
00123     
00124     sci_dis();
00125 }
00126 unsigned short int VS1002::read(unsigned short int address)
00127 {
00128     cs_low();                                //enables SCI/disables SDI
00129     
00130     while(!_DREQ);                            //wait unitl data request is high
00131     _spi.write(0x03);                        //SCI write
00132     _spi.write(address);                    //register address
00133     unsigned short int received = _spi.write(0x00);    //write out dummy byte
00134     received <<= 8;
00135     received += _spi.write(0x00);            //write out dummy byte
00136     
00137     cs_high();                                //enables SDI/disables SCI
00138     
00139     return received;                        //return received word
00140 }
00141 void VS1002::sine_test_activate(unsigned char wave)
00142 {
00143     cs_high();                                //enables SDI/disables SCI
00144     
00145     while(!_DREQ);                            //wait unitl data request is high
00146     _spi.write(0x53);                        //SDI write
00147     _spi.write(0xEF);                        //SDI write
00148     _spi.write(0x6E);                        //SDI write
00149     _spi.write(wave);                        //SDI write
00150     _spi.write(0x00);                        //filler byte
00151     _spi.write(0x00);                        //filler byte
00152     _spi.write(0x00);                        //filler byte
00153     _spi.write(0x00);                        //filler byte
00154 
00155     cs_low();                                //enables SCI/disables SDI
00156 }
00157 void VS1002::sine_test_deactivate(void)
00158 {
00159     cs_high();
00160     
00161     while(!_DREQ);
00162     _spi.write(0x45);                        //SDI write
00163     _spi.write(0x78);                        //SDI write
00164     _spi.write(0x69);                        //SDI write
00165     _spi.write(0x74);                        //SDI write
00166     _spi.write(0x00);                        //filler byte
00167     _spi.write(0x00);                        //filler byte
00168     _spi.write(0x00);                        //filler byte
00169     _spi.write(0x00);                        //filler byte
00170 }
00171 void VS1002::volume(void)
00172 {
00173  #ifdef FIXED_VOL
00174     unsigned char volumize = (0 * 255); // FIXED VOL (not support volume input)
00175  #else
00176     unsigned char volumize = (_VOL * 255);
00177  #endif
00178     while(!_DREQ);
00179     unsigned short int attenuation = ((256 * volumize) + volumize);
00180     sci_write(0x0B, attenuation);
00181 }
00182 
00183 void VS1002::play_song(int song_number)
00184 {
00185     /*====== Song Select ======*/
00186     
00187 //    char list[10000] = {0};
00188     char list[1000] = {0};
00189     char str[16] = {"/sd/"};
00190     unsigned int startplace = 0;
00191     unsigned int endplace = 0;
00192     unsigned int play = 0;
00193     num_of_files = 0;
00194 
00195     DIR *d;
00196     struct dirent *p;
00197     d = opendir("/sd");
00198     if(d != NULL) 
00199            {
00200                while((p = readdir(d)) != NULL) 
00201            {
00202                strcat(list, "*");
00203                strcat(list, p->d_name);
00204                num_of_files++;
00205            }
00206     }
00207     else 
00208     {
00209          perror("Could not open directory!");
00210     }
00211     strcat(list, "*");                                //terminating *
00212     if(num_of_files < song_number)
00213     {
00214         return;
00215     }
00216     while(play != song_number)
00217     {
00218         char symbol = list[startplace];
00219         startplace++;
00220         if(symbol == 0x2A)                        //0x2A = "*"    
00221         {
00222             play++;
00223         }                        
00224     }
00225     play = 0;
00226     while(play != (song_number+1))
00227     {
00228         char symbol = list[endplace];
00229         endplace++;    
00230         if(symbol == 0x2A)                        //0x2A = "*"    
00231         {
00232             play++;
00233         }
00234     }
00235 
00236     strncat(str, &list[startplace], endplace-startplace);
00237     str[(endplace-startplace)+3] = '\0';
00238 
00239 //printf("list: %s\r\n",list); //debug      
00240 
00241     /*====== File Transfer ======*/
00242 
00243      // return if not MP3 file
00244     if (!((strstr(str,"MP3")!=NULL)||(strstr(str,"mp3")!=NULL))) return;
00245     // display filename.mp3
00246     printf("Now Playing: %s\r\n",str);
00247     
00248     FILE *song;
00249     unsigned char array[512];
00250         
00251     song = fopen(str, "rb");
00252     
00253     if(!song) 
00254     {
00255         exit(1);
00256     }
00257    
00258        while(!feof(song))
00259     {
00260            fread(&array, 1, 512, song);
00261            for(int i=0; i<512; i++)
00262            {
00263 #ifndef FS_ONLY
00264             sdi_write(array[i]);
00265         //    printf(".");
00266 #endif
00267            }
00268 #ifndef FS_ONLY
00269             volume();
00270 #endif
00271        }
00272     for(int n=0; n<2048; n++)
00273        {
00274 #ifndef FS_ONLY
00275            sdi_write(0x00);
00276 #endif
00277        }
00278     fclose(song);                                //close the file
00279 }