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PIC18F and VS1011

 
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mdb486



Joined: 09 Feb 2009
Posts: 2

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PIC18F and VS1011
PostPosted: Fri Mar 06, 2009 8:21 pm     Reply with quote
Hey, Does anyone have an experience working with the VS1011 mp3 decoder chip?

I have been looking at several projects that use this chip, mainly this one: http://www.walrus.com/~raphael/mp3/MMC_version/sakura_24.576mhz_version.c

I tried to re-write this code to use the hardware SPI, by usuing SETUP_SPI. I also wrote a function to do a sine sweep, to make sure that the chip is working properly. As of right now, I am just getting static noise out of the VS1011.

This is the first project that I have tried to use the hardware SPI, I have a feeling that the way I am using the SPI is incorrect.

Here is my code, if anyone could help me out I would appreciate it.
I am using a PIC 18F452


Code:

#fuses HS,NOWDT,NOPROTECT,BROWNOUT,PUT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)

#byte READ  = 0x03
#byte WRITE = 0x02

char volume = 0;

void vs_sci(char inout, addr, data1, data2);
void vs_reset_hard(void);
void vs_reset_soft(void);
void vs_sine_test(void);

void main()
{
   setup_spi(SPI_MASTER | SPI_H_TO_L | SPI_CLK_DIV_4 | SPI_SS_DISABLED);
   
   vs_reset_hard();

   vs_reset_soft();
   vs_sine_test();
   
   while(1);
}

void vs_reset_hard(void)
{
   output_high(XCS);   
   output_high(XDCS);
   delay_ms(500);
   
   do{
      output_low(XRESET);
      delay_cycles(100);
      output_high(XRESET);
      delay_cycles(500);
      vs_sci(0x02,0x00,0x00,0x04);
      delay_ms(100);
   }while(!DREQ);
   
   delay_ms(1);
   vs_sci(0x02,0x00,0x08,0x00);
   delay_ms(1);
   vs_sci(0x02,0x0b,volume,volume);
   delay_ms(1);
   
}

void vs_reset_soft(void)
{
   vs_sci(0x02,0x00,0x08,0x04);
   delay_ms(1);
   vs_sci(0x02,0x0b,volume,volume);
   delay_ms(1);
}

void vs_sci(char inout, addr, data1, data2)
{
   output_high(XDCS);
   output_low(XCS);
   
   SPI_WRITE(inout);
   SPI_WRITE(addr);
   SPI_WRITE(data1);
   SPI_WRITE(data2);
   
   output_high(XCS);
}

void vs_sine_test(void)
{
   printf("SINE TEST\n\r");
   vs_sci(0x02, 0x00, 0x08, 0x20);
   while(!DREQ);
   
   output_low(XDCS);
   
   SPI_WRITE(0x53);  // Sine Command
   SPI_WRITE(0xEF);
   SPI_WRITE(0x6E);
   SPI_WRITE(0x44);  // Frequency
   SPI_WRITE(0x00);
   SPI_WRITE(0x00);
   SPI_WRITE(0x00);
   SPI_WRITE(0x00);
   delay_ms(500);
   
   SPI_WRITE(0x45);  // End Sine Command
   SPI_WRITE(0x78);
   SPI_WRITE(0x69);
   SPI_WRITE(0x74);
   SPI_WRITE(0x00);
   SPI_WRITE(0x00);
   SPI_WRITE(0x00);
   SPI_WRITE(0x00);
   delay_ms(500);
   
   output_high(XDCS);
   
   printf("END SINE TEST\n\r");
}


Thanks
Sydney



Joined: 13 Feb 2009
Posts: 71

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PostPosted: Sat Mar 07, 2009 3:36 pm     Reply with quote
I think you may need to do:

Code:
setup_spi(SPI_MASTER | SPI_H_TO_L | SPI_XMIT_L_TO_H | SPI_CLK_DIV_4 | SPI_SS_DISABLED);
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Mar 07, 2009 5:34 pm     Reply with quote
Quote:
SPI_SS_DISABLED

Don't use this parameter on an SPI Master. It's only intended for use
when the setup_spi() statement is defining an SPI slave.


Quote:
#byte READ = 0x03
#byte WRITE = 0x02

This is wrong. The #byte directive is normally used to tell the compiler
the address of a hardware register in the PIC. I believe you want to
define commands for your chip. You should do it this way:
Code:

#define READ  0x03
#define WRITE 0x02
mdb486



Joined: 09 Feb 2009
Posts: 2

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PostPosted: Mon Mar 09, 2009 2:17 pm     Reply with quote
Thanks for the replies!

I will give those a shot. I might have a problem with my hardware as well, but I ordered a breakout board from sparkfun for the vs1011, so I will give a shot on that board when I get it in.
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