Question

MSP430的SD卡程序，谁能给我一份，本人自己写了几次老是读出来的数据有误，

unsigned char DATA[512];

//===========================================================
//写一字节到SD卡,模拟SPI总线方式
void SdWrite(unsigned char n)
{
P5DIR = 0XFB;
unsigned char i;
for(i=8;i;i--)
{
SD_CLK_H;
SD_CLK_L;
if(n&0x80)
SD_DI_H;
else
SD_DI_L;
n<<=1;
}
SD_DI_H;
}
//===================================================================
//从SD卡读一字节,模拟SPI总线方式
unsigned char SdRead()
{
P5DIR = 0XFB;
unsigned char b=0,i;
for(i=8;i;i--)
{
b<<=1;
SD_CLK_L;
SD_CLK_H;
if(SD_DO_H)
b|=0x01;
}

return b;
}
//============================================================
//检测SD卡的响应
unsigned char SdResponse()
{
unsigned char i=0,response;

while(i<=8)
{
response = SdRead();
if(response==0x00)
break;
if(response==0x01)
break;
i++;
}
return response;
}
//================================================================
//发命令到SD卡
void SdCommand(unsigned char command, unsigned long argument, unsigned char CRC)
{

SdWrite(command|0x40);
SdWrite(((unsigned char *)&argument)[0]);
SdWrite(((unsigned char *)&argument)[1]);
SdWrite(((unsigned char *)&argument)[2]);
SdWrite(((unsigned char *)&argument)[3]);
SdWrite(CRC);
}
//================================================================
//初始化SD卡
unsigned char SdInit(void)
{
//int delay=0, trials=0;
unsigned char i;
unsigned char response=0x01;

SD_CS_H;
for(i=0;i<=9;i++)
SdWrite(0xff);
SD_CS_L;

//Send Command 0 to put MMC in SPI mode
SdCommand(0x00,0,0x95);

response=SdResponse();

if(response!=0x01)
{
return 0;
}

while(response==0x01)
{
SD_CS_H;
SdWrite(0xff);
SD_CS_L;
SdCommand(0x01,0x00ffc000,0xff);
response=SdResponse();
}
SD_CS_H;
SdWrite(0xff);
return 1;
}
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Answer 1

8051单片机还用C#来编写啊，用C就可以了，8051读SD卡是用SPI方式读的，你去看看SD卡这方面的读写方式吧

Answer 2

是温度控制还是检测？我前几天做了个温度检测的，凑合能用。要的话明天给你。程序现在不在我这儿

Answer 3

额