
Arduino MP3 Shield MP3Player This program comes from http://mbed.org/cookbook/VS1002-MP3-Decoder (Very small modification done to fit latest libs) **Additional small mods to xshige\'s code by mpetersen3 and kbuck3 to add a user interface
VS1002.cpp
- Committer:
- mpetersen3
- Date:
- 2010-10-12
- Revision:
- 0:9cb0b3d1b9e6
File content as of revision 0:9cb0b3d1b9e6:
#include "VS1002.h" #include "mbed.h" #include "TextLCD.h" AnalogIn rotary1(p19); DigitalIn pause1(p28); TextLCD lcd(p10, p18, p24, p23, p22, p21, TextLCD::LCD16x2 ); // rs, e, d0-d3 /* ================================================================== * Constructor * =================================================================*/ VS1002::VS1002( PinName mmosi, PinName mmiso, PinName ssck, PinName ccs, const char *name, PinName mosi, PinName miso, PinName sck, PinName cs, PinName rst, PinName dreq, PinName dcs, PinName vol) : _sd(mmosi, mmiso, ssck, ccs, name), _spi(mosi, miso, sck), _CS(cs), _RST(rst), _DREQ(dreq), _DCS(dcs), _VOL(vol) { } /*=================================================================== * Functions *==================================================================*/ void VS1002::cs_low(void) { _CS = 0; } void VS1002::cs_high(void) { _CS = 1; } void VS1002::dcs_low(void) { _DCS = 0; } void VS1002::dcs_high(void) { _DCS = 1; } void VS1002::sci_en(void) //SCI enable { cs_high(); dcs_high(); cs_low(); } void VS1002::sci_dis(void) //SCI disable { cs_high(); } void VS1002::sdi_en(void) //SDI enable { dcs_high(); cs_high(); dcs_low(); } void VS1002::sdi_dis(void) //SDI disable { dcs_high(); } void VS1002::reset(void) //hardware reset { wait(0.01); _RST = 0; wait(0.01); _RST = 1; wait(0.10); } void VS1002::power_down(void) //hardware and software reset { cs_low(); reset(); sci_write(0x00, SM_PDOWN); wait(0.01); reset(); } void VS1002::sci_initialise(void) { _RST = 1; //no reset _spi.format(8,0); //spi 8bit interface, steady state low _spi.frequency(1000000); //rising edge data record, freq. 1Mhz cs_low(); for(int i=0; i<4; i++) { _spi.write(0xFF); //clock the chip a bit } cs_high(); dcs_high(); wait_us(5); } void VS1002::sdi_initialise(void) { _spi.format(8,0); _spi.frequency(7000000); //set to 7MHz cs_high(); dcs_high(); } void VS1002::sci_write(unsigned char address, unsigned short int data) { sci_en(); //enables SCI/disables SDI while(!_DREQ); //wait unitl data request is high _spi.write(0x02); //SCI write _spi.write(address); //register address _spi.write((data >> 8) & 0xFF); //write out first half of data word _spi.write(data & 0xFF); //write out second half of data word sci_dis(); //enables SDI/disables SCI wait_us(5); } void VS1002::sdi_write(unsigned char datum) { sdi_en(); while(!_DREQ); _spi.write(datum); sci_dis(); } unsigned short int VS1002::read(unsigned short int address) { cs_low(); //enables SCI/disables SDI while(!_DREQ); //wait unitl data request is high _spi.write(0x03); //SCI write _spi.write(address); //register address unsigned short int received = _spi.write(0x00); //write out dummy byte received <<= 8; received += _spi.write(0x00); //write out dummy byte cs_high(); //enables SDI/disables SCI return received; //return received word } void VS1002::sine_test_activate(unsigned char wave) { cs_high(); //enables SDI/disables SCI while(!_DREQ); //wait unitl data request is high _spi.write(0x53); //SDI write _spi.write(0xEF); //SDI write _spi.write(0x6E); //SDI write _spi.write(wave); //SDI write _spi.write(0x00); //filler byte _spi.write(0x00); //filler byte _spi.write(0x00); //filler byte _spi.write(0x00); //filler byte cs_low(); //enables SCI/disables SDI } void VS1002::sine_test_deactivate(void) { cs_high(); while(!_DREQ); _spi.write(0x45); //SDI write _spi.write(0x78); //SDI write _spi.write(0x69); //SDI write _spi.write(0x74); //SDI write _spi.write(0x00); //filler byte _spi.write(0x00); //filler byte _spi.write(0x00); //filler byte _spi.write(0x00); //filler byte } void VS1002::volume(void) { #ifdef FIXED_VOL unsigned char volumize = (0 * 255); // FIXED VOL (not support volume input) #else unsigned char volumize = (_VOL * 255); #endif while(!_DREQ); unsigned short int attenuation = ((256 * volumize) + volumize); sci_write(0x0B, attenuation); } void VS1002::play_song(int song_number) { /*====== Song Select ======*/ // char list[10000] = {0}; char list[1000] = {0}; char str[16] = {"/sd/"}; unsigned int startplace = 0; unsigned int endplace = 0; unsigned int play = 0; num_of_files = 0; DIR *d; struct dirent *p; d = opendir("/sd"); if(d != NULL) { while((p = readdir(d)) != NULL) { strcat(list, "*"); strcat(list, p->d_name); num_of_files++; } } else { perror("Could not open directory!"); } strcat(list, "*"); //terminating * if(num_of_files < song_number) { return; } while(play != song_number) { char symbol = list[startplace]; startplace++; if(symbol == 0x2A) //0x2A = "*" { play++; } } play = 0; while(play != (song_number+1)) { char symbol = list[endplace]; endplace++; if(symbol == 0x2A) //0x2A = "*" { play++; } } strncat(str, &list[startplace], endplace-startplace); str[(endplace-startplace)+3] = '\0'; //printf("list: %s\r\n",list); //debug /*====== File Transfer ======*/ // return if not MP3 file if (!((strstr(str,"MP3")!=NULL)||(strstr(str,"mp3")!=NULL))) return; // display filename.mp3 to the lcd screen lcd.printf("Now Playing: %s\r\n",str); FILE *song; unsigned char array[512]; song = fopen(str, "rb"); if(!song) { exit(1); } while((!feof(song))&&!pause1) { fread(&array, 1, 512, song); for(int i=0; i<512; i++) { #ifndef FS_ONLY sdi_write(array[i]); // printf("."); #endif } #ifndef FS_ONLY volume(); #endif } for(int n=0; n<2048; n++) { #ifndef FS_ONLY sdi_write(0x00); #endif } fclose(song); //close the file }