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<P>SD卡接口程序/************************************************************/<BR>/*
SD Code for
M32L
*/<BR>/* By
pasyong
*/<BR>/*
2006-4
*/<BR>/* Base
ICC6.31A
*/<BR>/************************************************************/<BR>#include
<iom32v.h><BR>#include <macros.h><BR>#include
"1011.h"<BR>#define uchar unsigned char<BR>#define uint unsigned
int<BR>#define MMC_CS_PIN BIT(4)
//PORTB.4 <BR>#define MMC_PORT
PORTB </P>
<P> uchar reading=0,a=0,pointer=0;<BR>void
sd_port_init()<BR>{<BR>MMC_PORT|=MMC_CS_PIN;<BR>}<BR>uchar
BUFFER[512];
//扇区缓冲区<BR>uint i=0;<BR>void delay_nus(uint
n)<BR> {<BR> unsigned char b;<BR> for (b = 1;
b<n; b++)<BR> ;<BR> }
<BR>//****************************************************************************<BR>//Send
a Command to MMC/SD-Card<BR>//Return: the second byte of response register
of
MMC/SD-Card<BR>//****************************************************************************<BR>uchar
SD_Write_Command(uchar cmd,unsigned long arg)<BR>{<BR> uchar
tmp;<BR> uchar retry=0;<BR> <BR>
//MMC_PORT|=MMC_CS_PIN;
//SD卡关闭 <BR> //send 8 Clock
Impulse<BR> Write_Byte_SPI(0xFF);<BR>
<BR> //set MMC_Chip_Select to low (MMC/SD-Card
active)<BR>
MMC_PORT&=~MMC_CS_PIN; //SD卡使能</P>
<P> Write_Byte_SPI(cmd|0x40);
//送头命令<BR> Write_Byte_SPI(arg>>24);<BR>
Write_Byte_SPI(arg>>16); //send 6 Byte
Command to MMC/SD-Card<BR>
Write_Byte_SPI(arg>>8);<BR>
Write_Byte_SPI(arg&0xff);<BR>
Write_Byte_SPI(0x95);
//仅仅对RESET有效的CRC效验码<BR> <BR> //get 8 bit
response<BR> //Read_Byte_MMC(); //read the first byte,ignore
it. <BR> do <BR> { //Only last 8 bit is used
here.Read it out. <BR> tmp =
Read_Byte_SPI();<BR>
retry++;<BR> }<BR>
while((tmp==0xff)&&(retry<100));
//当没有收到有效的命令的时候<BR> <BR>
if(reading==0)<BR>
MMC_PORT|=MMC_CS_PIN;
//MMC_CS_PIN=1;<BR> else
MMC_PORT&=~MMC_CS_PIN;
//MMC_CS_PIN=0; <BR>
return(tmp);<BR>}<BR>//****************************************************************************<BR>//SD卡初始化(SPI-MODE)<BR>//****************************************************************************<BR>uchar
SD_Init(void)<BR>{ <BR> uchar
retry,temp;<BR> uchar i;<BR>
MMC_PORT&=~MMC_CS_PIN; //SD卡使能<BR>
<BR> delay_nus(250); //Wait MMC/SD ready...<BR>
for (i=0;i<0x0f;i++) <BR>
{<BR> Write_Byte_SPI(0xff); //send 74 clock
at least!!!<BR> }<BR> //Send Command CMD0 to
MMC/SD Card<BR> retry=0;<BR> <BR>
do<BR> { //retry 200 times to send CMD0 command
<BR>
temp=SD_Write_Command(0,0);<BR>
retry++;<BR> if(retry==100)
<BR> { <BR> ;//CMD0
Error!<BR> }<BR> } <BR>
while(temp!=1); <BR> <BR> //Send Command
CMD1 to MMC/SD-Card<BR> retry=0;<BR>
do<BR> { //retry 100 times to send CMD1 command
<BR>
temp=SD_Write_Command(1,0);<BR>
retry++;<BR> if(retry==100)
<BR> { <BR>
;<BR> }<BR> } <BR>
while(temp!=0); <BR> retry=0; <BR>
SD_Write_Command(16,512);
//设置一次读写BLOCK的长度为512个字节<BR> <BR>
MMC_PORT|=MMC_CS_PIN; //MMC_CS_PIN=1; //set
MMC_Chip_Select to high <BR> return(0); //All commands have
been taken.<BR>}
<BR>//****************************************************************************<BR>//从SD卡读一个扇区
Return 0 if no
Error.<BR>//****************************************************************************<BR>uchar
SD_Read_Block(unsigned long address)<BR>{ <BR> uchar
temp=0;uint i=0;<BR> reading=1; <BR>
temp=SD_Write_Command(17,address);
//读出RESPONSE <BR> while
(Read_Byte_SPI()!= 0xfe)<BR> {;}
//直到读取到了数据的开始头0XFE,才继续<BR> for(i=0; i<512;
i++)<BR> {<BR> BUFFER[i]=Read_Byte_SPI();<BR> }<BR>
Read_Byte_SPI();//CRC - Byte <BR> Read_Byte_SPI();//CRC -
Byte<BR> reading=0; <BR>
MMC_PORT|=MMC_CS_PIN;
//关闭SD卡<BR> return(temp);<BR>}</P><FONT color=#ff0000>欢迎进入<A
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