This program plays an internet radio audio stream like Shoutcast.
Dependencies: EthernetNetIf mbed HTTPClient
Diff: VS1002.cpp
- Revision:
- 0:37da71b87d96
diff -r 000000000000 -r 37da71b87d96 VS1002.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/VS1002.cpp Tue Mar 01 06:22:50 2011 +0000 @@ -0,0 +1,208 @@ + + +#include "VS1002.h" +#include "mbed.h" +#include "MSCFileSystem.h" + + +/* ================================================================== + * Constructor + * =================================================================*/ + +VS1002::VS1002(PinName mosi, PinName miso, PinName sck, PinName cs, PinName rst, PinName dreq, PinName dcs, PinName vol) +:_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) +{ + unsigned char volumize = (_VOL * 255); + while(!_DREQ); + + unsigned short int attenuation = ((256 * volumize) + volumize); + sci_write(0x0B, attenuation); +} + + +//Play the mp3 file from the USB filesystem (stream.mp3 on usb system) +void VS1002::play_song() +{ + + + /*====== File Transfer ======*/ + + FILE *song; + unsigned char array[512]; + song = fopen("/msc/stream.mp3", "rb"); + + if(!song) + { + exit(1); + } + + while(!feof(song)) + { + fread(&array, 1, 512, song); + for(int i=0; i<512; i++) + { + sdi_write(array[i]); + } + volume(); + } + for(int n=0; n<2048; n++) + { + sdi_write(0x00); + } + fclose(song); + + +} +