Pramod Nataraja
MP3 Player with touch panel interface and LCD display.
Dependencies: TextLCD mbed SDFileSystem
Diff: VS1002.cpp
- Revision:
- 0:a265079d50a2
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/VS1002.cpp Thu Oct 06 06:49:38 2011 +0000
@@ -0,0 +1,237 @@
+#include "VS1002.h"
+#include "mbed.h"
+
+Serial pc(USBTX, USBRX);
+TextLCD lcd(p30, p29, p17, p18, p19, p20);
+
+/* ==================================================================
+ * 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(signed int left, signed int right)
+{
+ while(_DREQ == 0);
+
+ unsigned short int _left = -left; //convert the decibel values into a format
+ unsigned short int _right = -right; //readable by the chip cf. datasheet p.32 subsection 8.6.11
+ _left *= 2;
+ _right *= 2;
+ unsigned short int attenuation = ((256 * _left) + _right);
+ cs_low();
+ sci_write(0x0B, attenuation); //writeout these values
+ cs_high();
+}
+
+void VS1002::play_song(int song_number)
+{
+ /*====== Song Select ======*/
+
+ char str[16] = "/sd/music/"; //folder where the songs are located
+ sprintf(str+10,"%d",song_number); //appending song number to path of the file
+ strcat(str,".mp3"); //appending .mp3 to file name
+ FILE *song;
+ unsigned char array[512]; //array for reading data from file
+ bool play_new=false; // Variable to see if new_song has be assigned or not
+
+ song = fopen(str, "r"); // Open the music file in read mode
+
+ /* Printing to LCD the present status */
+ lcd.cls();
+ if(pause)
+ lcd.printf("Paused ");
+ if(mute)
+ lcd.printf("Muted");
+ if(!mute && !pause)
+ lcd.printf("Playing");
+
+ lcd.printf("\n %d %s",new_song_number,song_name[new_song_number-1]);
+
+ if(!song)
+ {
+ lcd.printf("\n \n Error!!");
+ exit(1);
+ }
+ while(!feof(song))
+ {
+ if(!pause)
+ {
+
+ fread(&array, 1, 512, song);
+ for(int i=0; i<512; i++)
+ {
+ sdi_write(array[i]);
+ }
+ volume(volume_set,volume_set);
+ }
+ if(new_song_number!=song_number)
+ {
+ play_new=true;
+ break;
+ }
+
+
+ }
+
+ fclose(song); //close the file
+
+ if(!play_new)
+ {
+ new_song_number+=1; // Goto Next song on completion of one song
+ if(new_song_number==7)
+ new_song_number=1;
+ play_new=false;
+ }
+}
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