Cần giúp đỡ giao tiếp pic18f26k20 với thẻ nhớ sdcard

[nguyenphong91bk]

Hiện tại em đang làm đồ án,trong đó em còn gặp khó khăn trong việc giao tiếp giữa pic18f26k20 (pic này chạy 3.3V) với thẻ nhớ sdcard.Em cần phải tạo ra 1 file text trong thẻ nhớ để lưu dữ liệu vào
Sơ đồ mạch thì em mô tả luôn là em nối thẳng từ chân pic sang chân của thẻ nhớ vì là pic 3.3v.và em không dùng trở treo ở sda,sdo
Chân 1 (CS) nối với chân RA3 của pic
Chân 2 (SDI) nối với chân SDO của pic (RC5)
Chân 3 nối đất
Chân 4 (VDD) nối với điện áp 3.3V
Chân 5 (SCK) nối với chấn SCK của pic (RC3)
Chân 6 nối đất
Chân 7 (SDO) nối với SDI của pic (RC4)
Còn code thì em sử dụng code có sẵn của mikro C for pic để test mà nó toàn báo lên uart là "FAT16 not found"
Em không biết chèn code,anh mod chèn giúp em với ạ


sbit Mmc_Chip_Select at LATA3_bit; // for writing to output pin always use latch (PIC18 family)
sbit Mmc_Chip_Select_Direction at TRISA3_bit;
// eof MMC module connections

const LINE_LEN = 43;
char err_txt[20] = "FAT16 not found";
char file_contents[LINE_LEN] = "XX MMC/SD FAT16 library by Anton Rieckertn";
char filename[14] = "MIKRO00x.TXT"; // File names
unsigned short loop, loop2;
unsigned long i, size;
char Buffer[512];

// UART1 write text and new line (carriage return + line feed)
void UART1_Write_Line(char *uart_text) {
UART1_Write_Text(uart_text);
UART1_Write(13);
UART1_Write(10);
}

// Creates new file and writes some data to it
void M_Create_New_File() {
filename[7] = 'A';
Mmc_Fat_Set_File_Date(2010, 4, 19, 9, 0, 0); // Set file date & time info
Mmc_Fat_Assign(&filename, 0xA0); // Find existing file or create a new one
Mmc_Fat_Rewrite(); // To clear file and start with new data
for(loop = 1; loop <= 99; loop++) {
UART1_Write('.');
file_contents[0] = loop / 10 + 48;
file_contents[1] = loop % 10 + 48;
Mmc_Fat_Write(file_contents, LINE_LEN-1); // write data to the assigned file
}
}

// Creates many new files and writes data to them
void M_Create_Multiple_Files() {
for(loop2 = 'B'; loop2 <= 'Z'; loop2++) {
UART1_Write(loop2); // signal the progress
filename[7] = loop2; // set filename
Mmc_Fat_Set_File_Date(2010, 4, 19, 9, 0, 0); // Set file date & time info
Mmc_Fat_Assign(&filename, 0xA0); // find existing file or create a new one
Mmc_Fat_Rewrite(); // To clear file and start with new data
for(loop = 1; loop <= 44; loop++) {
file_contents[0] = loop / 10 + 48;
file_contents[1] = loop % 10 + 48;
Mmc_Fat_Write(file_contents, LINE_LEN-1); // write data to the assigned file
}
}
}

// Opens an existing file and rewrites it
void M_Open_File_Rewrite() {
filename[7] = 'C';
Mmc_Fat_Assign(&filename, 0);
Mmc_Fat_Rewrite();
for(loop = 1; loop <= 55; loop++) {
file_contents[0] = loop / 10 + 48;
file_contents[1] = loop % 10 + 48;
Mmc_Fat_Write(file_contents, LINE_LEN-1); // write data to the assigned file
}
}

// Opens an existing file and appends data to it
// (and alters the date/time stamp)
void M_Open_File_Append() {
filename[7] = 'B';
Mmc_Fat_Assign(&filename, 0);
Mmc_Fat_Set_File_Date(2010, 4, 19, 9, 20, 0);
Mmc_Fat_Append(); // Prepare file for append
Mmc_Fat_Write(" for mikroElektronika 2010n", 27); // Write data to assigned file
}

// Opens an existing file, reads data from it and puts it to UART
void M_Open_File_Read() {
char character;

filename[7] = 'B';
Mmc_Fat_Assign(&filename, 0);
Mmc_Fat_Reset(&size); // To read file, procedure returns size of file
for (i = 1; i <= size; i++) {
Mmc_Fat_Read(&character);
UART1_Write(character); // Write data to UART
}
}

// Deletes a file. If file doesn't exist, it will first be created
// and then deleted.
void M_Delete_File() {
filename[7] = 'F';
Mmc_Fat_Assign(filename, 0);
Mmc_Fat_Delete();
}

// Tests whether file exists, and if so sends its creation date
// and file size via UART
void M_Test_File_Exist() {
unsigned long fsize;
unsigned int year;
unsigned short month, day, hour, minute;
unsigned char outstr[12];

filename[7] = 'B'; //uncomment this line to search for file that DOES exists
// filename[7] = 'F'; //uncomment this line to search for file that DOES NOT exist
if (Mmc_Fat_Assign(filename, 0)) {
//--- file has been found - get its create date
Mmc_Fat_Get_File_Date(&year, &month, &day, &hour, &minute);
UART1_Write_Text(" created: ");
WordToStr(year, outstr);
UART1_Write_Text(outstr);
ByteToStr(month, outstr);
UART1_Write_Text(outstr);
WordToStr(day, outstr);
UART1_Write_Text(outstr);
WordToStr(hour, outstr);
UART1_Write_Text(outstr);
WordToStr(minute, outstr);
UART1_Write_Text(outstr);

//--- file has been found - get its modified date
Mmc_Fat_Get_File_Date_Modified(&year, &month, &day, &hour, &minute);
UART1_Write_Text(" modified: ");
WordToStr(year, outstr);
UART1_Write_Text(outstr);
ByteToStr(month, outstr);
UART1_Write_Text(outstr);
WordToStr(day, outstr);
UART1_Write_Text(outstr);
WordToStr(hour, outstr);
UART1_Write_Text(outstr);
WordToStr(minute, outstr);
UART1_Write_Text(outstr);

//--- get file size
fsize = Mmc_Fat_Get_File_Size();
LongToStr((signed long)fsize, outstr);
UART1_Write_Line(outstr);
}
else {
//--- file was not found - signal it
UART1_Write(0x55);
Delay_ms(1000);
UART1_Write(0x55);
}
}


// Tries to create a swap file, whose size will be at least 100
// sectors (see Help for details)
void M_Create_Swap_File() {
unsigned int i;

for(i=0; i<512; i++)
Buffer[i] = i;

size = Mmc_Fat_Get_Swap_File(5000, "mikroE.txt", 0x20); // see help on this function for details

if (size) {
LongToStr((signed long)size, err_txt);
UART1_Write_Line(err_txt);

for(i=0; i<5000; i++) {
Mmc_Write_Sector(size++, Buffer);
UART1_Write('.');
}
}
}

// Main. Uncomment the function(s) to test the desired operation(s)
void main() {
#define COMPLETE_EXAMPLE // comment this line to make simpler/smaller example
ADCON1 |= 0x0F; // Configure AN pins as digital
//CMCON |= 7; // Turn off comparators
C1ON_bit = 0; // Disable comparators
C2ON_bit = 0;

// Initialize UART1 module
UART1_Init(9600);
Delay_ms(10);

UART1_Write_Line("PIC-Started"); // PIC present report

// Initialize SPI1 module
SPI1_Init_Advanced(_SPI_MASTER_OSC_DIV64, _SPI_DATA_SAMPLE_MIDDLE, _SPI_CLK_IDLE_LOW, _SPI_LOW_2_HIGH);

// use fat16 quick format instead of init routine if a formatting is needed
if (Mmc_Fat_Init() == 0) {
// reinitialize spi at higher speed
SPI1_Init_Advanced(_SPI_MASTER_OSC_DIV64, _SPI_DATA_SAMPLE_MIDDLE, _SPI_CLK_IDLE_LOW, _SPI_LOW_2_HIGH);
//--- Test start
UART1_Write_Line("Test Start.");
//--- Test routines. Uncomment them one-by-one to test certain features
M_Create_New_File();
#ifdef COMPLETE_EXAMPLE
M_Create_Multiple_Files();
M_Open_File_Rewrite();
M_Open_File_Append();
M_Open_File_Read();
M_Delete_File();
M_Test_File_Exist();
M_Create_Swap_File();
#endif
UART1_Write_Line("Test End.");

}
else {
UART1_Write_Line(err_txt); // Note: Mmc_Fat_Init tries to initialize a card more than once.
// If card is not present, initialization may last longer (depending on clock speed)
}

}