static BYTE SD_reset(void)
{
BYTE i;
BYTE retry;
BYTE rev = 0x00;
for(i=0; i<10; i++)
{
DSPI_send_8_clocks(); //至少74个时钟，必须的!!!
}
//SD卡复位
//发送CMD0，正常跳出表示成功进入idle状态
for(retry=0; rev!=0x01; retry++)
{
rev = SD_send_cmd(0, 0); //发idle命令【？】
if(retry>100)
{
return 1;
}
}
//SD卡初始化(CMD1/CMD55+ACMD41两种方法)
for(retry=0; rev!=0x00; retry++)
{
rev = SD_send_cmd(1, 0); //发idle命令
if(retry>100)
{
return 2;
}
}
rev = SD_send_cmd(59, 0); //关crc
rev = SD_send_cmd(16, 512); //设扇区大小512
return 0; //正常返回
}
//----------------by-JJ----------------//
BYTE SD_read_multiple_block(DWORD sector, DWORD n, BYTE buffer[][SD_SECTOR_SIZE])
{
BYTE rev;
WORD i;
DWORD j;
rev = SD_send_cmd(18, sector<<9);
if(rev != 0x00)
{
return rev;
}
for (j=0; j<n; j++)
{
while(DSPI_read_write_byte(0xFF) != 0xFE){}
for(i=0; i<SD_SECTOR_SIZE; i++)
{
buffer[j][i] = DSPI_read_write_byte(0xFF);
}
DSPI_read_write_byte(0xFF);
DSPI_read_write_byte(0xFF);
}
SD_send_cmd(12, 0); //发送STOP_TRANSMISSION
DSPI_send_8_clocks();
return 0;
}
//----------------by-徐博----------------//
BYTE SD_write_block(DWORD sector, const BYTE *buffer) //sector=address,buffer=数据缓存区
{
BYTE rev;
WORD i;
rev = SD_send_cmd(24, sector<<9); //写命令,sector<<9:将地址左移9位,address=address*512,将块地址（扇区地址）转为字节地址
if(rev != 0x00)
{
return rev; //收到0x00表示成功
}
DSPI_read_write_byte(0xff);
DSPI_read_write_byte(0xff);
DSPI_read_write_byte(0xff);
DSPI_read_write_byte(0xfe); //发开始符
for(i=0; i<SD_SECTOR_SIZE; i++) //送512字节数据
{
DSPI_read_write_byte(*buffer++);
}
DSPI_read_write_byte(0xFF); //写入2个字节的CRC校验码，Don't care
DSPI_read_write_byte(0xFF);
rev = DSPI_read_write_byte(0xFF); //读取返回值
if((rev&0x1f) != 0x05) //若返回值为XXX00101,说明数据已经被SD卡接受
{
return rev; //写入失败
}
//等待操作完
while(!DSPI_read_write_byte(0xFF)){} //等待SD卡不忙
DSPI_send_8_clocks(); //按SD卡操作时序补8个时钟
return 0; //说明写扇区操作成功
}
//----------------by-徐博----------------//
BYTE SD_read_block(DWORD sector, BYTE *buffer) //sector=address,buffer=数据缓冲区
{
BYTE rev;
WORD i;
rev = SD_send_cmd(17, sector<<9); //读命令,发送CMD17,收到0x00表示成功
if(rev != 0x00)
{
return rev;
}
//等数据的开始
while(DSPI_read_write_byte(0xFF) != 0xFE){}//连续读直到读到开始字节0xfe
for(i=0; i<SD_SECTOR_SIZE; i++) //读512个数据，写入数据缓冲区
{
*buffer++ = DSPI_read_write_byte(0xFF);
}
DSPI_read_write_byte(0xFF); //读两个CRC字节
DSPI_read_write_byte(0xFF);
DSPI_send_8_clocks(); //按时序补8个时钟
return 0; //读取操作成功
}
//----------------by-JJ----------------//
BYTE SD_write_multiple_block(DWORD sector, DWORD n, const BYTE buffer[][SD_SECTOR_SIZE])
{
BYTE rev;
WORD i;
DWORD j;
rev = SD_send_cmd(25, sector<<9);
if(rev != 0x00)
{
return rev;
}
DSPI_read_write_byte(0xff);
DSPI_read_write_byte(0xff);
for(i=0; i<n; i++)
{
DSPI_read_write_byte(0xfc);
for(j=0; j<SD_SECTOR_SIZE; j++)
{
DSPI_read_write_byte(buffer[i][j]);
}
DSPI_read_write_byte(0xFF);
DSPI_read_write_byte(0xFF);
rev = DSPI_read_write_byte(0xFF);
if((rev&0x1f) != 0x05)
{
return rev;
}
while(!DSPI_read_write_byte(0xFF)){}
}
DSPI_read_write_byte(0xfb);
while(!DSPI_read_write_byte(0xFF)){}
//SD_send_cmd(12, 0); //这句话导致后续的多扇区读出错
DSPI_send_8_clocks();
return 0;
}
char write_string_to_files(uchar * data)
{
int waitCnt=0;
int maxWaitCnt = 100000;
NORMALTIME time;
uchar fileName[30];//本来只有13长度，怕越界了
time = Time_GetTime();
sprintf(fileName,"%02d%02d%02d%02d.txt",time.tm_year-2000,time.tm_mon,time.tm_mday,time.tm_hour);
//①获取系统状态
//----------------------------------------------------------------------------
waitCnt=0;
while(IS_SD_BUSY)
{
waitCnt++;
if(waitCnt>maxWaitCnt)
{
return 7;
}
};//先判断SD是否忙
SD_read_system();//上电后串口第一个字节发不出去
SD_read_system();
//等待状态
F_wait_response = 0x01;
SD_cmd_return_byte = 0;
waitCnt = 0;
while(F_wait_response)
{
waitCnt++;
if(waitCnt>maxWaitCnt)
{
return 1;
}
};
if((SD_cmd_return_byte & 0xCF) == 0x0D)//没有文件打开
{
}
else if((SD_cmd_return_byte & 0xCF) == 0x1D)//已经有文件打开 则关闭
{
SD_close_file();
while(IS_SD_BUSY);
}
else
{
return SD_cmd_return_byte;
}
//②创建文件
//----------------------------------------------------------------------------
SD_send_cmd(SD_CREATE,13,fileName);
F_wait_response = 0x01;
SD_cmd_return_byte = 0;
waitCnt=0;
while(F_wait_response)
{
waitCnt++;
if(waitCnt>maxWaitCnt)
{
return 2;
}
};
while(IS_SD_BUSY);
//③打开文件
//----------------------------------------------------------------------------
SD_send_cmd(SD_OPEN,13,fileName);
F_wait_response = 0x01;
SD_cmd_return_byte = 0;
waitCnt=0;
while(F_wait_response)
{
waitCnt++;
if(waitCnt>maxWaitCnt)
{
return 3;
}
};
while(IS_SD_BUSY);
//④写入文件
//----------------------------------------------------------------------------
SD_send_data(SD_WRITE,strlen(data)+4,0xffffffff,data);
F_wait_response = 0x01;
SD_cmd_return_byte = 0;
waitCnt=0;
while(F_wait_response)
{
waitCnt++;
if(waitCnt>maxWaitCnt)
{
return 4;
}
};
while(IS_SD_BUSY);
//⑤保存文件
//----------------------------------------------------------------------------
SD_save_file();//保存文件
F_wait_response = 0x01;
SD_cmd_return_byte = 0;
waitCnt=0;
while(F_wait_response)
{
waitCnt++;
if(waitCnt>maxWaitCnt)
{
return 5;
}
};
while(IS_SD_BUSY);
//⑥关闭文件
//----------------------------------------------------------------------------
SD_close_file();//关闭文件
F_wait_response = 0x01;
SD_cmd_return_byte = 0;
waitCnt=0;
while(F_wait_response)
{
waitCnt++;
if(waitCnt>maxWaitCnt)
{
return 6;
}
};
while(IS_SD_BUSY);
return 0;
}
