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mdb486
Joined: 09 Feb 2009
Posts: 2
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| PIC18F and VS1011 |
 Posted: Fri Mar 06, 2009 8:21 pm |
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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");
}
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Thanks |
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Sydney
Joined: 13 Feb 2009
Posts: 71
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| Posted: Sat Mar 07, 2009 3:36 pm |
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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); |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Mar 07, 2009 5:34 pm |
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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 |
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mdb486
Joined: 09 Feb 2009
Posts: 2
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| Posted: Mon Mar 09, 2009 2:17 pm |
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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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