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[AVR] problem with mp3 code !!!!!!!!!!

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ghoola

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Is there any problem with this code it doesn't work?

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/*******************************************************************/
/*          SD diriver for  MP3 Player                             */
/*                                                                 */
/* Platform   : AVRStudio4.13 b528 + WinAVR20070525                */
/*              optimize -0s                                       */
/* Author     : bozai(Zhang Qibo)                                  */
/* E-mail     : [email]sudazqb@163.com[/email]                                    */
/* MSN        : [email]zhangqibo_1985@hotmail.com[/email]                         */
/* Date       : 2006-06-16                                         */
/*******************************************************************/
/*  2007-06-16: After reading the spec. in detail, I found some    */
/*              of the code don't meet the spec., that is after    */
/*              the last SPI transaction, it need an extra 8 CLK   */
/*              to finish it's work                                */
/*  2007-05-04: add read capacity function                         */
/*  2007-04-21:                                                    */
/*  Enable some code incase that when SD reset                     */
/*  faild program can't jump the loop                              */
/*******************************************************************/
 
 
 
 
#include <avr/io.h>
#include "MMC_SD.h"
 
  //spi low speed
void SPI_Low(void)
{
    SPCR =   _BV(SPE)|_BV(MSTR)|_BV(SPR1)|_BV(SPR0);
    SPSR &= ~_BV(SPI2X);
}
 
    //spi full speed
void SPI_High(void)
{
    SPCR =  _BV(SPE)|_BV(MSTR);
    SPSR |= _BV(SPI2X);
}
 
 //port initialize
void SPI_Init(void)
{
    DDR_INI();
    SPI_Low();
}
 
        //read and write one byte
uint8 SPI_WriteByte(uint8 val)
{
    SPDR = val;
    while(!(SPSR & _BV(SPIF)));
    return SPDR;
}
 
uint8 SPI_ReadByte(void)
{
    SPDR = 0xff;
    while(!(SPSR & _BV(SPIF)));
    return SPDR;
}
        //sd card initialize
void MMC_SD_Init(void)
{
    SPI_Init();
    SPI_CS_Deassert();
}
 
    //sd send command
uint8 MMC_SD_SendCommand(uint8 cmd, uint32 arg)
{
    uint8 r1;
    uint8 retry=0;
    
    SPI_WriteByte(0xff);
    SPI_CS_Assert();
    
    SPI_WriteByte(cmd | 0x40);  //send command
    SPI_WriteByte(arg>>24);
    SPI_WriteByte(arg>>16);
    SPI_WriteByte(arg>>8);
    SPI_WriteByte(arg);
    SPI_WriteByte(0x95);
    
    while((r1 = SPI_WriteByte(0xff)) == 0xff)   //wait response
        if(retry++ > 20) break;                 //time out error
 
    SPI_CS_Deassert();
    SPI_WriteByte(0xff);                // extra 8 CLK
 
    return r1;              //return state
}
 
    //reset sd card (software)
uint8 MMC_SD_Reset(void)
{
    uint8 i;
    uint8 retry;
    uint8 r1=0;
    retry = 0;
    SPI_Low();
    do
    {
        for(i=0;i<10;i++) SPI_WriteByte(0xff);
        r1 = MMC_SD_SendCommand(0, 0);  //send idle command
        retry++;
        if(retry>100) return 1;     //time out
    } while(r1 != 0x01);    
 
 
    retry = 0;
    do
    {
        r1 = MMC_SD_SendCommand(1, 0);  //send active command
        retry++;
        if(retry>254) return 1;     //time out
    } while(r1);
    SPI_High();
    r1 = MMC_SD_SendCommand(59, 0); //disable CRC
 
    r1 = MMC_SD_SendCommand(16, 512);   //set sector size to 512
    return 0;   //normal return
}
 
    //read one sector
uint8 MMC_SD_ReadSingleBlock(uint32 sector, uint8* buffer)
{
    uint8 r1;
    uint16 i;
    uint16 retry=0;
 
    r1 = MMC_SD_SendCommand(17, sector<<9); //read command
    
    if(r1 != 0x00)
        return r1;
 
    SPI_CS_Assert();
        //wait to start recieve data
    while(SPI_WriteByte(0xff) != 0xfe)if(retry++ > 1000){SPI_CS_Deassert();return 1;}
 
    for(i=0; i<512; i++)    //read 512 bytes
    {
        *buffer++ = SPI_WriteByte(0xff);
    }
 
    SPI_WriteByte(0xff);//αcrc    //dummy crc
    SPI_WriteByte(0xff);
    
    SPI_CS_Deassert();
    SPI_WriteByte(0xff);// extra 8 CLK
 
    return 0;
}
 
 
    //wirite one sector //not used in this application
uint8 MMC_SD_WriteSingleBlock(uint32 sector, uint8* buffer)
{
    uint8 r1;
    uint16 i;
    uint16 retry=0;
 
    r1 = MMC_SD_SendCommand(24, sector<<9); //send command
    if(r1 != 0x00)
        return r1;
 
    SPI_CS_Assert();
    
    SPI_WriteByte(0xff);
    SPI_WriteByte(0xff);
    SPI_WriteByte(0xff);
 
    SPI_WriteByte(0xfe);            //send start byte "token"
    
    for(i=0; i<512; i++)        //send 512 bytes data
    {
        SPI_WriteByte(*buffer++);
    }
    
    SPI_WriteByte(0xff);            //dummy crc
    SPI_WriteByte(0xff);
    
    r1 = SPI_WriteByte(0xff);
    
    if( (r1&0x1f) != 0x05)  //judge if it successful
    {
        SPI_CS_Deassert();
        return r1;
    }
        //wait no busy
    while(!SPI_WriteByte(0xff))if(retry++ > 2000){SPI_CS_Deassert();return 1;}
 
    SPI_CS_Deassert();
    SPI_WriteByte(0xff);// extra 8 CLK
 
    return 0;
}
 
 
 
uint32 MMC_SD_ReadCapacity()
{
    uint8 r1;
    uint16 i;
    uint16 temp;
    uint8 buffer[16];
    uint32 Capacity;
    //uint8 retry=0;
 
    r1 = MMC_SD_SendCommand(9, 0);  //send command  //READ CSD
    if(r1 != 0x00)
        return r1;
 
    SPI_CS_Assert();
    while(SPI_WriteByte(0xff) != 0xfe);
    
    for(i=0;i<16;i++)
    {
        buffer[i]=SPI_WriteByte(0xff);
    }   
 
    SPI_WriteByte(0xff);
    SPI_WriteByte(0xff);
    
    SPI_WriteByte(0xff);
    
    SPI_CS_Deassert();
 
    SPI_WriteByte(0xff);// extra 8 CLK
 
/*********************************/
//  C_SIZE
    i = buffer[6]&0x03;
    i<<=8;
    i += buffer[7];
    i<<=2;
    i += ((buffer[8]&0xc0)>>6);
 
/**********************************/
//  C_SIZE_MULT
 
    r1 = buffer[9]&0x03;
    r1<<=1;
    r1 += ((buffer[10]&0x80)>>7);
 
 
/**********************************/
// BLOCKNR
 
    r1+=2;
 
    temp = 1;
    while(r1)
    {
        temp*=2;
        r1--;
    }
    
    Capacity = ((uint32)(i+1))*((uint32)temp);
 
/////////////////////////
// READ_BL_LEN
 
    i = buffer[5]&0x0f;
 
/*************************/
//BLOCK_LEN
 
    temp = 1;
    while(i)
    {
        temp*=2;
        i--;
    }
/************************/
 
 
/************** formula of the capacity ******************/
//
//  memory capacity = BLOCKNR * BLOCK_LEN
//  
//  BLOCKNR = (C_SIZE + 1)* MULT
//
//           C_SIZE_MULT+2
//  MULT = 2
//
//               READ_BL_LEN
//  BLOCK_LEN = 2
/**********************************************/
 
//The final result
    
    Capacity *= (uint32)temp;    
    return Capacity;        
}
 
Last edited by a moderator:

From reading the program,I get that you are using serial peripheral interface(SPI) to access a audio file in an SD card..
But specifically,what problem is occurring?Is the code not getting compiled/even if it is getting compiled,the system is behaving differently,not as it should behave..?
Also can you upload the circuit diagram of the system?
 

the diagram is
123.png
 

It is good that you uploaded the circuit diagram...and you are saying..
Is there any problem with this code it doesn't work?
Click to expand...
How..do you know that the code is not working?What exactly is the problem you are facing?please specify.....
 

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