WIZnet
Playing MP3 with Music Shield and WIZwiki-W7500
Dependencies: FTPClient javakysSDFileSystem2 WIZnetInterface mbed
Prerequisite
This example is for playing MP3 file stored in SD card on WIZwiki-W7500 and updating MP3 files from server to SD card via FTP protocol.
To implement this function, you need a Platform board, network Interface board, MP3 decoder board and SD card. Below are what we used.
- WIZwiki-W7500 from WIZnet (Platform board and Ethernet I/F board)
- Music shield from Seeed Studio
- SD card
Hardware Configuration
WIZwiki-W7500 Pin map
SPI1 for SD Card
SPI1 on WIZwiki-W7100 is for reading from or writing to SD card and pins for SPI1 are PB_0, PB_1, PB_2 and PB_3.
SPI0 and other control pins for MP3 decoder
WIZwiki-W7500 communicates to MP3 decoder on Music Shield via SPI0 pins of which consists of PC_12, D11, D12 and D13.
And PC_13, PC_14 and PC-15 are used for DCS, DREQ and RST, respectively.
InterruptIn pins for 5-Way Navigation Switch
D3, D4, D5, D6 and D7 are connected to 5 way navigation switch on Music Shield.
When user pushes the switch to one way, a relevant pin is grounded so that he or she should make it set high at the beginning.
Software
SPI Initialization
//Declaration in VS1002.cpp
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)
: _DREQ(dreq), _RST(rst), _spi(mosi, miso, sck), _CS(cs), _DCS(dcs), _sd(mmosi, mmiso, ssck, ccs, name) {
}
//Initialization in main.cpp
VS1002 mp3(PB_3, PB_2, PB_1, PB_0,"sdc",D11, D12 ,D13, PC_12, PC_15, PC_14, PC_13);
Mapping 5-Way Navigation Switch into InterruptIn pins
main.cpp
InterruptIn K_VU(D3); // Volume UP Key InterruptIn K_VD(D7); // Volume Down Key InterruptIn K_FW(D4); // Foward Key InterruptIn K_BW(D6); // Backward Key InterruptIn K_ONOFF(D5); //Play/Resume or Pause Key
Additional codes due to mbed library bug of WIZwiki-W7500
main.cpp
//Operating Clock Frequency Set *(volatile uint32_t *)(0x41001014) = 0x0060100; //Set all InterruptIn pins to Internal PullUp *(volatile uint32_t *)(0x41003000) = 0x00000002; //D6 *(volatile uint32_t *)(0x41003004) = 0x00000002; //D5 *(volatile uint32_t *)(0x41003008) = 0x00000002; //D4 *(volatile uint32_t *)(0x41003080) = 0x00000002; //D3 *(volatile uint32_t *)(0x41003098) = 0x00000002; //D7
Caution
This example can play only MP3 files with up to 192KHz sample rate//
VS1002.cpp
- Committer:
- javakys
- Date:
- 2017-03-30
- Revision:
- 2:cea9f6564641
- Parent:
- 1:fc4e0c572992
File content as of revision 2:cea9f6564641:
#include "VS1002.h"
#include "mbed.h"
Serial pc(USBTX, USBRX);
/* ==================================================================
* 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)
: _DREQ(dreq), _RST(rst), _spi(mosi, miso, sck), _CS(cs), _DCS(dcs), _sd(mmosi, mmiso, ssck, ccs, name) {
}
/*===================================================================
* 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(2000000); //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]; //folder where the songs are located
sprintf(str,"/sdc/%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
if(!song)
{
new_song_number+=1; // Goto Next song on completion of one song
if(new_song_number==10)
new_song_number=1;
fclose(song); //close the file
return;
}
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==10)
new_song_number=1;
play_new=false;
}
}