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软件模拟SPI口,S3C44B0,问题求助

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xl042140|  楼主 | 2008-4-30 22:57 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
模拟, spi, 软件, s3c44b0, se
用软件模拟SPI,一直调试不通,请各位高手指正程序错误,主要是还是感觉时序有点问题.但是一直基本上都是对的.还请那位仁兄指正程序错误,
!!!!!!!!!!抱歉耽误5.1休息时间
调了2天了.还是没调出来.
感谢走过 ,路过,留言的人..



#define R0  0 
#define R1  1 
#define R1b 2 
#define R2  3 
#define R3  4 
#include "44b.h"
#include "Uart.h"
#include "44blib.h"
#include "DEF.h"
uint32 looptime; 
uint8  rep[5]; 



#define  nop()    do{;}while(0); 

#define  CS_PIN    0  //CS GPF0
#define  DI_PIN    7  //GPF5

#define  SD_CS_PORT       rPDATF
#define  SD_CS_DDR_PORT   rPCONF 
#define  SD_CS_PUP_PORT   rPUPF 

#define  SD_DI_PORT       rPDATF
#define  SD_DI_DDR_PORT   rPCONF 
#define  SD_DI_PUP_PORT   rPUPF 


#define  DO_PIN    5  //EN GPF7 
#define  CLK_PIN   8  //RS GPF8

#define  SD_DO_PORT       rPDATF 
#define  SD_DO_DDR_PORT   rPCONF 
#define  SD_DO_PUP_PORT   rPUPF

#define  SD_CLK_PORT       rPDATF 
#define  SD_CLK_DDR_PORT   rPCONF 
#define  SD_CLK_PUP_PORT   rPUPF 

#define CS_LOW()   SD_CS_PORT  &= ~(1<< CS_PIN) 
#define CS_HIGH()  SD_CS_PORT  |= (1<< CS_PIN) 
#define DI_LOW()   SD_DI_PORT  &= ~(1<< DI_PIN) 
#define DI_HIGH()  SD_DI_PORT  |= (1<< DI_PIN) 
#define CLK_LOW()  SD_CLK_PORT &= ~(1<< CLK_PIN) 
#define CLK_HIGH() SD_CLK_PORT |= (1<< CLK_PIN) 
#define DO()       SD_DO_PORT   & 0xff
#define _400KHZ_ 128 
#define _10MHZ_  1 

//----------------------------------------------------------- 
//延时 
 void loop(uint32 i) 
//----------------------------------------------------------- 
{ 
        while (i--) 
        { 
                ;//nop(); 
        }         
}  
  
//----------------------------------------------------------- 
//发送一字节数据 
 void SPI_send(uint8 cmd) 
//----------------------------------------------------------- 
{ 
        uint8 i; 
        uint8 MASK[] = {0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01}; 

        for (i = 0; i < 8; i++) 
        { 
                CLK_LOW(); 

                if (cmd & MASK) 
           DI_HIGH(); 
                else 
           DI_LOW(); 

                loop(looptime); 

                CLK_HIGH(); 
                loop(looptime);
        } 
} 

//----------------------------------------------------------- 
//接收一字节数据 
uint8 SPI_receive(void) 
//----------------------------------------------------------- 
{ 
        uint8 i; 
        uint8 ret = 0; 
        uint8 MASK[] = {0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01}; 

        for (i = 0; i < 8; i++) 
        { 
                CLK_LOW(); 

                loop(looptime); 

                if (DO())  
                   ret |= MASK; 

        CLK_HIGH(); 
        loop(looptime); 
        } 
        return ret; 
} 

//----------------------------------------------------------- 
//发送命令 
 uint8 SendCommand(uint8 cmd, uint32 arg, uint8 ACK) 
//----------------------------------------------------------- 
{ 
        uint8 status; 
        uint8 i; 
        uint8 len; 
        CS_HIGH();
        loop(74);
        CS_LOW();

        SPI_send(cmd|0x40); 
        SPI_send(arg>>24); 
        SPI_send(arg>>16); 
        SPI_send(arg>>8); 
        SPI_send(arg); 
        SPI_send(0x95); 
  
        switch (ACK) 
        { 
                case R0: 
          return 1; 
        case R1: 
          len=1; 
          break; 
        case R2: 
          len=2; 
          break; 
        case R3: 
          len=5; 
                  break; 
        default: 
          return 0; 
          break; 
        } 

        for (i = 0; i < 100; i++) 
        { 
                status = SPI_receive(); 
        if (!(status & 0x80))  
                  break; 
    } 

        if (i >= 100) 
        { 
            SPI_send(0xff); 
        return 0; 
        } 

        rep[0] = status; 

        for (i = 1; i < len; i++) 
        { 
            rep = SPI_receive(); 
        } 

        SPI_send(0xff); 

        return 1; 
} 

//----------------------------------------------------------- 
 void Reset(void) 
//----------------------------------------------------------- 
{ 
        CS_LOW(); 

        SendCommand(0x00,0x00,R0); 

        CS_HIGH(); 
} 

//----------------------------------------------------------- 
uint32 IsSD(void) 
//----------------------------------------------------------- 
{ 
        uint32 i; 

        CS_LOW(); 

        for (i = 0; i < 1000; i++) 
        { 
           SendCommand(55,0x0000,R1); 

       SendCommand(41,0x0000,R1); 

       if (!rep[0])  
             break; 

       loop(200); 
    } 

    CS_HIGH(); 

    return i != 100;  
} 

//----------------------------------------------------------- 
uint32  IsMMC(void) 
//----------------------------------------------------------- 
{ 
        uint32 i; 

        CS_LOW(); 

        for (i = 0; i < 1000; i++) 
        { 
       SendCommand(1, 0x0000, R1); 

       if (!rep[0]) 
             break; 

       loop(200); 
    } 

        CS_HIGH(); 

    return i != 100;  
} 

//----------------------------------------------------------- 
int SD_erase(uint32 sector,uint8 *buff) 
//----------------------------------------------------------- 
{ 
        CS_LOW(); 

        if (!SendCommand(32,sector<<9,R1)||!SendCommand(33,sector<<9,R1)||!SendCommand(38,0x0000,R1)) 
        { 
           CS_HIGH(); 

           return 0; 
        }  

    while (!DO())  
             SPI_send(0xff); 

    CS_HIGH(); 
     
    return 1; 
} 

uint32 SD_read(uint32 sector,uint8 *buff) 
{ 
        uint32 i;  

        CS_LOW(); 

        if (!SendCommand(17,sector<<9,R1)) 
        { 
           CS_HIGH(); 
           Uart_Printf("readerr1"); 
           return 0; 
        }  

        for (i = 0; i < 100; i++) 
        {   
       if (SPI_receive() == 0xfe)  
             break; 
    } 

    if (i >= 100) 
    { 
       CS_HIGH(); 
       Uart_Printf("readerr2"); 
       return 0; 
    } 

        for (i = 0; i < 512; i++) 
        { 
             *buff++ = SPI_receive(); 
    } 

         SPI_receive(); 
         SPI_receive(); 

         SPI_send(0xff); 

         CS_HIGH(); 
          
         Uart_Printf("readOK"); 

         return 1;   
} 

uint32 SD_write(uint32 sector,uint8 *buff) 
{ 
        uint32 i; 

        CS_LOW(); 

        SendCommand(24,sector<<9,R1); 

        SPI_send(0xfe); 

        for (i = 0; i < 512; i++) 
            SPI_send(buff); 

        SPI_send(0xff); 
        SPI_send(0xff); 
  
        for (i = 0; i < 100; i++) 
        { 
           rep[0] = SPI_receive(); 
       if (!rep[0])  
             break; 
    } 
    if (i >= 100)  
    { 
       Uart_Printf("writeerr1"); 
           return 0; 
        } 

    while (!DO())  
                SPI_send(0xff); 

    CS_HIGH(); 
     
    Uart_Printf("writeOK"); 
//下面其实是复位     
    looptime =_400KHZ_; 
         
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff);  
         
        IsSD(); 
         
        looptime=_10MHZ_; 
//完 
    return 1;   
} 

void SD_install(void) 
{ 
        looptime =_400KHZ_; 
         
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff); 
        SPI_send(0xff);  

        Reset(); 

        if (!IsSD()&&!IsMMC()) 
        { 
                Uart_Printf("unknown card type! "); 
                return; 
        } 
       Uart_Printf("SD/MMC card found!  Now loading SD/MMC driver...... "); 
        looptime=_10MHZ_; 
} 

void SD_init(void) 
{ rPCONF=0x082555;//PF8 :CLK,OUTPUT;PF7:DATAIN,INPUT;PF5:DATAOUT,OUTPUT;PF0,OUTPUT,CS
 SD_install(); 
} 

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