Subversion Repositories Projects

Compare Revisions

Ignore whitespace Rev 294 → Rev 293

/FollowMe/sdc.c
1,688 → 1,254
#include <avr/io.h>
#include <util/delay.h>
#include <string.h>
#include "fat16.h"
#include "sdc.h"
#include "ssc.h"
#include "timer0.h"
#include "printf_P.h"
#include "crc16.h"
 
#define _SD_DEBUG
 
#define CMD_GO_IDLE_STATE 0x00 /* CMD00: response R1 */
#define CMD_SEND_OP_COND 0x01 /* CMD01: response R1 */
#define CMD_SEND_IF_COND 0x08 /* CMD08: response R7 */
#define CMD_SEND_CSD 0x09 /* CMD09: response R1 */
#define CMD_SEND_CID 0x0A /* CMD10: response R1 */
#define CMD_SEND_STATUS 0x0D /* CMD13: response R2 */
#define CMD_SET_BLOCKLEN 0x10 /* CMD16: arg0[31:0]: block length, response R1*/
#define CMD_READ_SINGLE_BLOCK 0x11 /* CMD17: arg0[31:0]: data address, response R1 */
#define CMD_WRITE_SINGLE_BLOCK 0x18 /* CMD24: arg0[31:0]: data address, response R1 */
#define CMD_APP_CMD 0x37 /* CMD55: response R1 */
#define CMD_READ_OCR 0x3A /* CMD58: response R3 */
#define CMD_CRC_ON_OFF 0x3B /* CMD59: arg0[31:1]: stuff bits, arg0[0:0]: crc option, response R1 */
#define ACMD_SEND_OP_COND 0x29 /* ACMD41: arg0[31]: stuff bits, arg0[30]: HCS, arg0[29:0] stuff bits*, response R1 */
 
#define R1_NO_ERR 0x00
#define R1_IDLE_STATE 0x01
#define R1_ERASE_RESET 0x02
#define R1_ILLEGAL_CMD 0x04
#define R1_COM_CRC_ERR 0x08
#define R1_ERASE_SEQUENCE_ERR 0x10
#define R1_ADDRESS_ERR 0x20
#define R1_PARAMETER_ERR 0x40
#define R1_BAD_RESPONSE 0x80
 
#define R2_NO_ERR 0x00
#define R2_CARD_LOCKED 0x01
#define R2_ERASE_WRITE_PROT_ERR 0x02
#define R2_UNKOWN_ERR 0x04
#define R2_CARD_CTRL_ERR 0x08
#define R2_CARD_ECC_ERR 0x10
#define R2_WRITE_PROT_ERR 0x20
#define R2_ERASE_PARAM_ERR 0x40
#define R2_OUT_OF_RANGE_ERR 0x80
 
#define DATA_START_TOKEN 0xFE
#define DATA_RESPONSE_MASK 0x1F
#define DATA_RESPONSE_OK 0x05
#define DATA_RESPONSE_CRC_ERR 0x0B
#define DATA_RESPONSE_WRITE_ERR 0x1D
 
typedef enum
{
VER_UNKNOWN,
VER_1X,
VER_20
} SDVersion_t;
 
typedef struct
{
uint8_t Valid;
SDVersion_t Version; // HW-Version
uint32_t Capacity; // Memory capacity in bytes
uint8_t CID[16]; // CID register
uint8_t CSD[16]; // CSD register
} __attribute__((packed)) SDCardInfo_t;
 
 
volatile SDCardInfo_t SDCardInfo;
 
//________________________________________________________________________________________________________________________________________
// Function: CRC7(uint8_t* cmd, uint32_t len);
// Module name: mmc.c
// Compiler used: avr-gcc 3.4.5
// Last Modifikation: 24.07.2007
// Version: 1.05
// Authors: Stephan Busker
// Description: Source files for connecting to an sdcard using the SSC
//
// Description: This function calculated the CRC7 checksum used in the last byte of a spi command frame.
//........................................................................................................................................
// Functions: u8 SDC_init(void);
// u8 SDC_PutCommand (u8*CMD);
// u8 SDC_PutSector(u32 addr,u8*Buffer);
// u8 SDC_GetSector(u32 addr,u8*Buffer);
// void SDC_GetBlock(u8*CMD,u8*Buffer,u16 Bytes);
//
////........................................................................................................................................
// ext. functions: extern void SSC_Init(void);
// extern u8 SSC_GetChar (void);
// extern void SSC_PutChar (u8);
// extern void SSC_Enable(void);
// extern void SSC_Disable(void);
//........................................................................................................................................
//
// Returnvalue: the function returns the crc7 including bit 0 set to 1
// URL: www.Mikro-Control.de
// mailto: stephan.busker@mikro-control.de
//________________________________________________________________________________________________________________________________________
 
uint8_t CRC7(uint8_t *cmd, uint32_t len)
{
uint8_t i, a;
uint8_t crc, Data;
 
crc = 0; // init CRC buffer
for (a = 0; a < len ;a++) // for every byte in the msg
{
Data = cmd[a];
for (i=0;i<8;i++) // for every bit in the byte
{
crc <<= 1; // shift crc
if ((Data & 0x80)^(crc & 0x80)) crc ^=0x09; //xor
Data <<= 1; // shift data for next bit
}
}
crc = (crc<<1)|1; // set terminating bit to 1
return(crc);
}
 
 
uint8_t SDC_WaitForBusy(uint16_t timeout)
{
uint8_t rsp = 0;
uint16_t timestamp = 0;
 
SSC_Enable(); // enable chipselect.
timestamp = SetDelay(timeout);
do
{
rsp = SSC_GetChar();
if(CheckDelay(timestamp)) break;
}while(rsp != 0xFF); // wait while card is busy (data out low)
return(rsp);
}
 
//________________________________________________________________________________________________________________________________________
// Function: SDC_SendCMDR1(uint8_t CmdNo, uint32_t arg);
// Funtion: SDC_Init(void);
//
// Description: This function initialises the SDCard to spi-mode.
//
//
// Description: This function send a command frame to the SD-Card in spi-mode.
//
//
// Returnvalue: The function returns the first response byte like for R1 commands
// Returnvalue: the function returns 0 if the initialisation was successfull otherwise the function returns an errorcode.
//________________________________________________________________________________________________________________________________________
uint8_t SDC_SendCMDR1(uint8_t CmdNo, uint32_t arg)
 
u8 SDC_Init(void)
{
uint8_t r1;
uint16_t timeout = 0;
uint16_t a;
uint8_t cmd[6];
u8 Timeout = 0;
u8 CMD[] = {0x40,0x00,0x00,0x00,0x00,0x95};
u16 a = 0;
u8 b = 0;
 
cmd[0] = 0x40|CmdNo; // set command index
cmd[1] = (arg & 0xFF000000)>>24;
cmd[2] = (arg & 0x00FF0000)>>16;
cmd[3] = (arg & 0x0000FF00)>>8;
cmd[4] = (arg & 0x000000FF);
cmd[5] = CRC7(cmd, 5); // update checksum
#ifdef _SD_DEBUG
printf("\r\nCmd=%02X, arg=%04X%04X", CmdNo, (uint16_t)(arg>>16), (uint16_t)(0xFFFF & arg));
#endif
SSC_Disable(); // disable chipselect.
SSC_PutChar(0xFF); // dummy to sync
SSC_Enable(); // enable chipselect.
_delay_loop_2(200);
//SDC_WaitForBusy(500); // wait 500ms until card is busy
SSC_Init(); // Initialise SSC to transmit data to the sdcard.
 
for (a = 0;a < 6; a++) // send the command sequence to the sdcard (6 bytes)
{
SSC_PutChar(cmd[a]);
_delay_loop_2(10);
}
// get response byte
do
{
r1 = SSC_GetChar(); // get byte from sd-card
if (timeout++ > 1000) break;
}while(r1 == 0xFF); // wait for the response byte from sd-card.
#ifdef _SD_DEBUG
printf("-->R1=%02X", r1);
#endif
return(r1);
}
 
//________________________________________________________________________________________________________________________________________
// Function: SDC_SendACMDR1(uint8_t CmdNo, uint32_t arg);
//
// Description: This function send a application command frame to the SD-Card in spi-mode.
//
//
// Returnvalue: The function returns the first response byte like for R1 commands
//________________________________________________________________________________________________________________________________________
uint8_t SDC_SendACMDR1(uint8_t CmdNo, uint32_t arg)
{
uint8_t r1 = 0xFF;
r1 = SDC_SendCMDR1(CMD_APP_CMD, 0UL);
if(r1 & R1_BAD_RESPONSE) return(r1);
r1 = SDC_SendCMDR1(CmdNo, arg);
return(r1);
}
_delay_ms(10); // before initialising the sdcard wait for 10ms
 
//________________________________________________________________________________________________________________________________________
// Function: SDC_GetData(uint8_t * cmd ,u8 *Buffer, u32 len);
//
// Description: This function sneds cmd an reads a datablock of len from the sd-card
//
//
// Returnvalue: SD_Result_t
//________________________________________________________________________________________________________________________________________
 
SD_Result_t SDC_GetData(uint8_t CmdNo, uint32_t addr, uint8_t *Buffer, uint32_t len)
{
uint8_t rsp;
uint16_t a, crc16;
SD_Result_t result = SD_ERROR_UNKNOWN;
 
// send the command
rsp = SDC_SendCMDR1(CmdNo, addr);
if (rsp != R1_NO_ERR)
for (b=0;b<0x0f;b++) // sending 74Clocks brings the sdcard into spimode.
{
result = SD_ERROR_BAD_RESPONSE;
goto end;
_delay_us(1); // wait at least 1us between the characters.
SSC_PutChar(0xff);
}
 
do
while(SDC_PutCommand (CMD) !=1) // Sending CMD0 (Reset) to the sdcard.
{
rsp = SSC_GetChar();
if((rsp & 0xF0) == 0x00) // data error token
if (Timeout++ > 200)
{
return(1);
}
}
Timeout = 0;
CMD[0] = 0x41;
CMD[5] = 0xFF;
while( SDC_PutCommand (CMD) !=0) // Sending CMD1 to the sdcard.
{
if (Timeout++ > 100)
{
result = SD_ERROR_READ_DATA;
goto end;
return(2);
}
}while(rsp != DATA_START_TOKEN);
// data start token received
for (a = 0; a < len; a++) // read the block from the SSC
{
Buffer[a] = SSC_GetChar();
}
// Read two bytes CRC16-Data checksum
crc16 = SSC_GetChar(); // highbyte first
crc16 = (crc16<<8)|SSC_GetChar(); // lowbyte last
/* if(crc16 != CRC16(Buffer, len)) result = SD_ERROR_CRC_DATA;
else */result = SD_SUCCESS;
 
end:
if(result != SD_SUCCESS)
{
printf("Error %02X reading data from sd card (R1=%02X).\r\n", result, rsp);
}
return(result);
SSC_Disable(); // disable sdcard.
return(0);
}
 
 
 
 
//________________________________________________________________________________________________________________________________________
// Function: SDC_PrintCID(u8 * pCID);
// Funtion: SDC_PutCommand(* CMD);
//
// Description: This function initialises the SDCard to spi-mode.
//
//
// Description: This function prints the CIS register in a human readable format.
//
//
// Returnvalue: the function returns nothing
// Returnvalue: the function returns 0 if the initialisation was successfull otherwise the function returns an errorcode.
//________________________________________________________________________________________________________________________________________
 
void SDC_PrintCID(uint8_t * pCID)
u8 SDC_PutCommand (u8*CMD)
{
uint8_t pn[6];
uint16_t temp1, temp2;
u8 tmp = 0xff;
u8 Timeout = 0;
u16 a = 0;
 
printf("\r\n Manufacturer ID: %i\r\n", pCID[0]);
memcpy(pn, &pCID[1], 2);
pn[2] = '\0'; // terminate string
printf(" Application ID: %s\r\n",pn);
memcpy(pn, &pCID[3], 5);
pn[5] = '\0'; // terminate string
printf(" Product Name: %s\r\n",pn);
printf(" Product Rev.: %i.%i\r\n",pCID[8]>>4, pCID[8]&0xF);
printf(" Serial No.: ");
for(temp1 = 0; temp1<4; temp1++)
 
#ifdef SSC_RX_FIFO
SSC_ClearRxFifo();
#endif
SSC_Disable(); // disable chipselect
SSC_PutChar(0xFF); // Send 8 Clocks to the sdcard while card is not selected.
SSC_Enable(); // enable chipselect.
 
if (*CMD == 0x41) _delay_ms(10); // if command is CMD0 generate a short delay.
for (a = 0;a<0x06;a++) // send the command sequence to the sdcard (6 bytes)
{
printf("%02X", pCID[9+temp1]);
SSC_PutChar(*CMD++);
}
printf("\r\n");
temp1 = pCID[14] & 0x0F; // month
temp2 = ((pCID[14]>>4)|(pCID[13]<<4)) + 2000; // year
printf(" Manufac. Date: %i/%i\r\n\r\n",temp1, temp2);
}
 
//________________________________________________________________________________________________________________________________________
// Function: SDC_GetCID(uint8_t * pCID);
//
// Description: This function reads the CIS register form the sd card in spi mode.
//
//
// Returnvalue: the function returns error state
//________________________________________________________________________________________________________________________________________
#ifdef SSC_RX_FIFO
SSC_ClearRxFifo();
#endif
while (tmp == 0xff) // Wait for response from sdcard.
{
tmp = SSC_GetChar();
if (Timeout++ > 100)
{
break; // or timeout.
}
}
 
SD_Result_t SDC_GetCID(uint8_t * pCID)
{
return SDC_GetData(CMD_SEND_CID, 0UL, pCID, 16);
return(tmp);
}
 
//________________________________________________________________________________________________________________________________________
// Function: SDC_GetCSD(uint8_t * pCSD);
//
// Description: This function reads the CSD register form the sd card in spi mode.
//
//
// Returnvalue: the function returns error state
//________________________________________________________________________________________________________________________________________
 
SD_Result_t SDC_GetCSD(uint8_t * pCSD)
{
return SDC_GetData(CMD_SEND_CSD, 0UL, pCSD, 16);
}
 
 
//________________________________________________________________________________________________________________________________________
// Function: SDC_Init(void);
// Funtion: SDC_PutSector(void);
//
// Description: This function writes one sector of data to the SSC
//
//
// Description: This function initialises the SDCard to spi-mode.
//
//
// Returnvalue: the function returns 0 if the initialisation was successfull otherwise the function returns an errorcode.
// Returnvalue: none
//________________________________________________________________________________________________________________________________________
 
SD_Result_t SDC_Init(void)
u8 SDC_PutSector(u32 addr,u8*Buffer)
{
uint16_t timeout = 0;
uint8_t rsp[6]; // SD-SPI response buffer
SD_Result_t result = SD_ERROR_UNKNOWN;
u8 tmp;
u8 CMD[] = {0x58,0x00,0x00,0x00,0x00,0xFF};
addr = addr << 9; // convert sectoradress to byteadress
CMD[1] = ((addr & 0xFF000000) >>24 );
CMD[2] = ((addr & 0x00FF0000) >>16 );
CMD[3] = ((addr & 0x0000FF00) >>8 );
 
if(SD_SWITCH) // init only if the SD-Switch is indicating a card in the slot
tmp = SDC_PutCommand (CMD); // send command to sdcard.
if (tmp != 0)
{
printf("\r\n SSC init...");
SSC_Init();
printf("ok");
 
_delay_loop_2(1050);
 
printf("\r\n SDC init...");
SDCardInfo.Valid = 0;
/* The host shall supply power to the card so that the voltage is reached to Vdd_min within 250ms and
start to supply at least 74 SD clocks to the SD card with keeping cmd line to high. In case of SPI
mode, CS shall be held to high during 74 clock cycles. */
SSC_Disable(); // set SD_CS high
for (timeout = 0; timeout < 15; timeout++) // 15*8 = 120 cycles
{
SSC_PutChar(0xFF);
}
 
// switch to idle state
#ifdef _SD_DEBUG
printf("\r\nGoing idle state..");
#endif
timeout = 0;
do
{
rsp[0] = SDC_SendCMDR1(CMD_GO_IDLE_STATE, 0UL);
if (timeout++ > 500)
{
printf("reset timeout");
result = SD_ERROR_RESET;
goto end;
}
}while(rsp[0] != R1_IDLE_STATE);
// enable crc feature
/* if(SDC_SendCMDR1(CMD_CRC_ON_OFF, 1UL) != R1_IDLE_STATE)
{
printf("Bad cmd59 R1=%02X.", rsp[0]);
result = SD_ERROR_BAD_RESPONSE;
goto end;
}*/
// check for card hw version
// 2.7-3.6V Range = 0x01, check pattern 0xAA
rsp[0] = SDC_SendCMDR1(CMD_SEND_IF_COND, 0x000001AA);
// answer to cmd58 is an R7 response (R1+ 4Byte IFCond)
if(rsp[0] & R1_BAD_RESPONSE)
{
printf("Bad cmd8 R1=%02X.", rsp[0]);
result = SD_ERROR_BAD_RESPONSE;
goto end;
}
if(rsp[0] & R1_ILLEGAL_CMD)
{
//Ver1.X SD Memory Card or not a SD Memory Card
SDCardInfo.Version = VER_1X;
}
else
{
// Ver2.00 or later SD Memory Card
// reading the remaining bytes of the R7 response
SDCardInfo.Version = VER_20;
for(timeout = 1; timeout < 5; timeout++)
{
rsp[timeout] = SSC_GetChar();
}
//check pattern
if(rsp[4]!= 0xAA)
{
printf("Bad cmd8 R7 check pattern.\r\n");
result = SD_ERROR_BAD_RESPONSE;
goto end;
}
if ( (rsp[3] & 0x0F)!= 0x01 ) // voltage range is not 2.7-3.6V
{
 
printf("Card is incompatible to 3.3V.\r\n");
result = SD_ERROR_BAD_VOLTAGE_RANGE;
goto end;
}
}
 
rsp[0] = SDC_SendCMDR1(CMD_READ_OCR, 0UL);
// answer to cmd58 is an R3 response (R1 + 4Byte OCR)
if(rsp[0] & R1_BAD_RESPONSE)
{
printf("Bad cmd58 R1 %02x.", rsp[0]);
result = SD_ERROR_BAD_RESPONSE;
goto end;
}
if(rsp[0] & R1_ILLEGAL_CMD)
{
printf("Not an SD-CARD.");
result = SD_ERROR_NO_SDCARD;
goto end;
}
// read 4 bytes of OCR register
for(timeout = 1; timeout < 5; timeout++)
{
rsp[timeout] = SSC_GetChar();
}
// FollowMe & SD-Logger uses 3.3 V, therefore check for bit 20 & 21
if((rsp[2] & 0x30) != 0x30)
{
// supply voltage is not supported by sd-card
printf("Card is incompatible to 3.3V.");
result = SD_ERROR_BAD_VOLTAGE_RANGE;
goto end;
}
 
// Initialize the sd-card sending continously ACMD_SEND_OP_COND (only supported by SD cards)
timeout = SetDelay(2000); // set timeout to 2000 ms (large cards tend to longer)
do
{
rsp[0] = SDC_SendACMDR1(ACMD_SEND_OP_COND, 0UL);
if(rsp[0] & R1_BAD_RESPONSE)
{
printf("Bad Acmd41 R1=%02X.", rsp[0]);
result = SD_ERROR_BAD_RESPONSE;
goto end;
}
if(CheckDelay(timeout))
{
printf("Init timeout.");
result = SD_ERROR_INITIALIZE;
goto end;
}
} while(rsp[0] & R1_IDLE_STATE); // loop until idle state
 
if(rsp[0] != R1_NO_ERR)
{
printf("Init error.");
result = SD_ERROR_INITIALIZE;
goto end;
}
/* set block size to 512 bytes */
if(SDC_SendCMDR1(CMD_SET_BLOCKLEN, 512UL) != R1_NO_ERR)
{
printf("Error setting block length to 512.");
result = SD_ERROR_SET_BLOCKLEN;
goto end;
}
 
//SSC_Disable(); // set SD_CS high
// here is the right place to inrease the SPI baud rate to maximum
//SSC_Enable(); // set SD_CS high
 
// read CID register
result = SDC_GetCID((uint8_t *)&SDCardInfo.CID);
if(result != SD_SUCCESS)
{
printf("Error reading CID.\r\n");
goto end;
}
 
// read CSD register
result = SDC_GetCSD((uint8_t *)&SDCardInfo.CSD);
if(result != SD_SUCCESS)
{
printf("Error reading CSD.");
goto end;
}
 
printf("ok\r\n");
 
uint8_t c_size_mult, read_bl_len;
uint32_t c_size;
 
switch(SDCardInfo.CSD[0]>>6) // check CSD Version
{
case 0x00: // if CSD is V1.0 structure (2GB limit)
 
/*
memory capacity = BLOCKNR * BLOCK_LEN
BLOCKNR = (C_SIZE+1) * MULT
MULT = 2^(C_SIZE_MULT+2)
BLOCK_LEN = 2^READ_BL_LEN
 
C_SIZE is 12 bits [73:62] in CSD register
C_SIZE_MULT is 3 bits [49:47] in CSD register
READ_BL_LEN is 4 bits [83:80] in CSD register
*/
 
read_bl_len = (SDCardInfo.CSD[5] & 0x0F); //CSD[05] -> [87:80]
c_size = ((uint32_t)(SDCardInfo.CSD[6] & 0x03))<<10; //CSD[06] -> [79:72]
c_size |= ((uint32_t)SDCardInfo.CSD[7])<<2; //CSD[07] -> [71:64]
c_size |= (uint32_t)(SDCardInfo.CSD[8]>>6); //CSD[08] -> [63:56]
c_size_mult = (SDCardInfo.CSD[9] & 0x03)<<1; //CSD[09] -> [55:48]
c_size_mult |=(SDCardInfo.CSD[10] & 0x80)>>7; //CSD[10] -> [47:40]
SDCardInfo.Capacity = (uint32_t)(c_size+1)*(1L<<(c_size_mult+2))*(1L<<read_bl_len);
break;
 
case 0x01: // if CSD is V2.0 structure (HC SD-Card > 2GB)
 
/*
memory capacity = (C_SIZE+1) * 512K byte
C_SIZE is 22 bits [69:48] in CSR register
*/
 
c_size = ((uint32_t)(SDCardInfo.CSD[7] & 0x3F))<<16; //CSD[07] -> [71:64]
c_size |= ((uint32_t)SDCardInfo.CSD[8])<<8; //CSD[08] -> [63:56]
c_size |= (uint32_t)SDCardInfo.CSD[9]; //CSD[09] -> [55:48];
SDCardInfo.Capacity = (c_size + 1)* 512L * 1024L;
break;
 
default: //unknown CSD Version
SDCardInfo.Capacity = 0;
break;
}
 
switch(SDCardInfo.Version)
{
case VER_1X:
printf(" SD-CARD V1.x");
break;
case VER_20:
printf(" SD-CARD V2.0 or later");
default:
break;
}
uint16_t mb_size = (uint16_t)(SDCardInfo.Capacity/(1024L*1024L));
printf("\r\n Capacity = %i MB", mb_size);
 
SDC_PrintCID((uint8_t *)&SDCardInfo.CID);
SDCardInfo.Valid = 1;
// jump point for error condition before
end:
SSC_Disable();
return(tmp);
}
else
#ifdef SSC_RX_FIFO
SSC_ClearRxFifo();
#endif
for (u8 a=0;a<100;a++) // wait until sdcard is ready
{
SSC_Deinit();
SDCardInfo.Valid = 0;
result = SD_ERROR_NOCARD;
printf("No Card in Slot.");
SSC_GetChar();
}
return(result);
SSC_PutChar(0xFE); // send start of header to the SSC
for (u16 a=0;a<512;a++) // transmitt one sector (normaly 512bytes) of data to the sdcard.
{
SSC_PutChar(*Buffer++);
}
SSC_PutChar(0xFF); // write two bytes of crc to the sdcard (not used in spi-mode)
SSC_PutChar(0xFF);
#ifdef SSC_RX_FIFO
SSC_ClearRxFifo();
#endif
while (SSC_GetChar() != 0xff){}; // wait untile the sdcard is ready.
SSC_Disable(); // disable sdcard.
 
return(0);
}
 
 
 
//________________________________________________________________________________________________________________________________________
// Function: SDC_Deinit(void);
// Funtion: SDC_GetSector(u32 addr,u8*Buffer);
//
// Description: This function reads one sector of data from the SSC
//
//
// Description: This function deinitialises the SDCard interface.
//
//
// Returnvalue: the function returns 0 if the initialisation was successfull otherwise the function returns an errorcode.
// Returnvalue: none
//________________________________________________________________________________________________________________________________________
 
SD_Result_t SDC_Deinit(void)
{
printf("\r\n SDC deinit...");
SSC_Deinit();
u8 SDC_GetSector(u32 addr,u8*Buffer)
{
u8 CMD[] = {0x51,0x00,0x00,0x00,0x00,0xFF};
addr = addr << 9; // convert sectoradress to byteadress.
 
SDCardInfo.Valid = 0;
SDCardInfo.Capacity = 0;
SDCardInfo.Version = VER_UNKNOWN;
CMD[1] = ((addr & 0xFF000000) >>24 );
CMD[2] = ((addr & 0x00FF0000) >>16 );
CMD[3] = ((addr & 0x0000FF00) >>8 );
 
printf("ok");
return(SD_SUCCESS);
SDC_GetBlock(CMD,Buffer,512); // read specified sector from sdcard.
 
return(0);
}
 
 
 
//________________________________________________________________________________________________________________________________________
// Function: SDC_PutSector(uint32_t addr, const uint8_t *Buffer)
// Funtion: SDC_GetBlock(void);
//
// Description: This function reads one block of data of s16 bytes from the SSC.
//
//
// Description: This function writes one sector of data to the SSC
//
//
// Returnvalue: SD_Result_t
// Returnvalue: the function returns 0 if the initialisation was successfull otherwise the function returns an errorcode.
//________________________________________________________________________________________________________________________________________
 
SD_Result_t SDC_PutSector(uint32_t addr, const uint8_t *Buffer)
{
uint8_t rsp;
uint16_t a, crc16;
uint16_t timeout = 0;
SD_Result_t result = SD_ERROR_UNKNOWN;
 
addr = addr << 9; // convert sectoradress to byteadress
rsp = SDC_SendCMDR1(CMD_WRITE_SINGLE_BLOCK, addr);
if (rsp != R1_NO_ERR)
void SDC_GetBlock(u8*CMD,u8*Buffer,u16 Bytes)
{
if (SDC_PutCommand (CMD) != 0) // Send command to the sdcard.
{
result = SD_ERROR_BAD_RESPONSE;
goto end;
return;
}
 
for (a=0;a<20;a++) // at least one byte
#ifdef SSC_RX_FIFO
SSC_ClearRxFifo();
#endif
while (SSC_GetChar() != 0xfe){}; // wait until the sdcard is ready to transmitt data.
for (u16 a=0;a<Bytes;a++) // read the block from the SSC (normaly 512Bytes)
{
SSC_GetChar();
*Buffer++ = SSC_GetChar();
}
crc16 = CRC16(Buffer, 512); // calc checksum for data block
SSC_PutChar(DATA_START_TOKEN); // send data start of header to the SSC
 
for (a=0;a<512;a++) // transmit one sector (normaly 512bytes) of data to the sdcard.
{
SSC_PutChar(Buffer[a]);
}
// write two bytes of crc16 to the sdcard
SSC_PutChar((uint8_t)(crc16>>8)); // write high byte first
SSC_PutChar((uint8_t)(0x00FF&crc16)); // lowbyte last
 
do // wait for data response token
{
rsp = SSC_GetChar();
if(timeout++ > 500)
{
result = SD_ERROR_TIMEOUT;
goto end;
}
}while((rsp & 0x11) != 0x01 );
// analyse data response token
switch(rsp & DATA_RESPONSE_MASK)
{
case DATA_RESPONSE_OK:
result = SD_SUCCESS;
break;
case DATA_RESPONSE_CRC_ERR:
result = SD_ERROR_CRC_DATA;
goto end;
break;
case DATA_RESPONSE_WRITE_ERR:
result = SD_ERROR_WRITE_DATA;
goto end;
break;
default:
result = SD_ERROR_UNKNOWN;
goto end;
break;
 
}
// wait 2 seconds until the sdcard is busy.
rsp = SDC_WaitForBusy(2000);
if(rsp != 0xFF)
{
result = SD_ERROR_TIMEOUT;
goto end;
}
 
// check card status
rsp = SDC_SendCMDR1(CMD_SEND_STATUS, 0);
// first byte of R2 response is like R1 response
if(rsp != R1_NO_ERR)
{
result = SD_ERROR_BAD_RESPONSE;
SSC_GetChar(); // read out 2nd byte
goto end;
}
// 2nd byte of r2 response
rsp = SSC_GetChar();
if(rsp != R2_NO_ERR)
{
result = SD_ERROR_WRITE_DATA;
SSC_GetChar();
goto end;
}
end:
if(result != SD_SUCCESS)
{
printf("Error %02X writing data to sd card (R=%02X).\r\n", result, rsp);
}
return(result);
SSC_GetChar(); // Read two bytes CRC- checksum (not used in spi-mode)
SSC_GetChar();
SSC_Disable(); // disable sdcard.
}
 
 
 
 
//________________________________________________________________________________________________________________________________________
// Function: SDC_GetSector(uint32_t addr,uint8_t *Buffer);
//
// Description: This function reads one sector of data from the SSC
//
//
// Returnvalue: SD_Result_t
//________________________________________________________________________________________________________________________________________
 
SD_Result_t SDC_GetSector(uint32_t addr,uint8_t *Buffer)
{
addr = addr << 9; // convert sectoradress to byteadress
return SDC_GetData(CMD_READ_SINGLE_BLOCK, addr, Buffer, 512);
}