//***************************************************************************
//Function: to read multiple blocks from SD card & send every block to UART
//Arguments: none
//return: unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//****************************************************************************
unsigned char SD_readMultipleBlock (unsigned long startBlock, unsigned long totalBlocks) {
unsigned char response;
unsigned int i, retry=0;
retry = 0;
response = SD_sendCommand(READ_MULTIPLE_BLOCKS, startBlock <<9);
//read a Block command
//block address converted to starting address of 512 byte Block
if(response != 0x00) {
//check for SD status: 0x00 - OK (No flags set)
return response;
}
SD_CS_ASSERT;
while( totalBlocks ) {
retry = 0;
while(SPI_receive() != 0xfe) {
//wait for start block token 0xfe (0x11111110)
if(retry++ > 0xfffe) {
SD_CS_DEASSERT;
return 1;
} //return if time-out
}
for(i=0; i<512; i++) {
//read 512 bytes
buffer[i] = SPI_receive();
}
SPI_receive();
//receive incoming CRC (16-bit), CRC is ignored here
SPI_receive();
SPI_receive();
//extra 8 cycles
TX_NEWLINE;
transmitString_F(PSTR(" --------- "));
TX_NEWLINE;
for(i=0; i<512; i++) {
//send the block to UART
if(buffer[i] == '~') {
break;
}
transmitByte ( buffer[i] );
}
TX_NEWLINE;
transmitString_F(PSTR(" --------- "));
TX_NEWLINE;
totalBlocks--;
}
SD_sendCommand(STOP_TRANSMISSION, 0); //command to stop transmission
SD_CS_DEASSERT;
SPI_receive(); //extra 8 clock pulses
return 0;
}
//******************************************************************
//Function: to initialize the SD card in SPI mode
//Arguments: none
//return: unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
unsigned char SD_init(void)
{
unsigned char i, response, retry=0 ;
SD_CS_ASSERT;
do
{
for(i=0;i<10;i++)
SPI_transmit(0xff);
response = SD_sendCommand(GO_IDLE_STATE, 0);//send 'reset & go idle' command
retry++;
if(retry>0xfe) {transmitString_F(PSTR("SD init fail..")); return 1; }//time out
} while(response != 0x01);
SD_CS_DEASSERT;
SPI_transmit (0xff);
SPI_transmit (0xff);
retry = 0;
do
{
response = SD_sendCommand(SEND_OP_COND, 0); //activate card's initialization process
response = SD_sendCommand(SEND_OP_COND, 0); //resend command (for compatibility with some cards)
retry++;
if(retry>0xfe) return 1; //time out
}while(response);
SD_sendCommand(CRC_ON_OFF, OFF); //disable CRC; deafault - CRC disabled in SPI mode
SD_sendCommand(SET_BLOCK_LEN, 512); //set block size to 512
return 0; //normal return
}
//***************************************************************************
//Function : to read multiple blocks from SD card & send every block to UART
//Arguments : none
//return : uint8_t; will be 0 if no error,
// otherwise the response byte will be sent
//****************************************************************************
uint8_t SD_readMultipleBlock (uint32_t startBlock, uint32_t totalBlocks)
{
uint8_t response;
uint16_t i, retry=0;
response = SD_sendCommand(READ_MULTIPLE_BLOCKS, startBlock); //write a Block command
if(response != 0x00)
return(response); //check for SD status: 0x00 - OK (No flags set)
SD_CS_ASSERT;
while( totalBlocks )
{
retry = 0;
while(SPI_Receive8(SD_SPI_PORT) != 0xfe) //wait for start block token 0xfe (0x11111110)
if(retry++ > 0xfffe)
{
SD_CS_DEASSERT;
return(1);
} //return if time-out
for(i=0; i<512; i++) //read 512 bytes
buffer[i] = SPI_Receive8(SD_SPI_PORT);
SPI_Receive8(SD_SPI_PORT); //receive incoming CRC (16-bit), CRC is ignored here
SPI_Receive8(SD_SPI_PORT);
SPI_Receive8(SD_SPI_PORT); //extra 8 cycles
// printf_P(PSTR("\n --------- \n"));
for(i=0; i<512; i++) //send the block to UART
{
if(buffer[i] == '~')
break;
// printf("%c", buffer[i] );
}
// printf_P(PSTR("\n --------- \n"));
totalBlocks--;
}
SD_sendCommand(STOP_TRANSMISSION, 0); //command to stop transmission
SD_CS_DEASSERT;
SPI_Receive8(SD_SPI_PORT); //extra 8 clock pulses
return(0);
}
//******************************************************************
//Function : to write to a single block of SD card
//Arguments : none
//return : uint8_t; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
uint8_t SD_writeSingleBlock(uint32_t startBlock) //, uint8_t atomic)
{
uint8_t response;
uint16_t i, retry=0;
if(Atomic)
{
LIS_SD_ATOMIZE; // disable INT0 to make it quasi atomic
}
response = SD_sendCommand(WRITE_SINGLE_BLOCK, startBlock); //write a Block command
if(response != 0x00)
return(response); //check for SD status: 0x00 - OK (No flags set)
SD_CS_ASSERT;
SPI_Send8(0xfe,SD_SPI_PORT); //Send start block token 0xfe (0x11111110)
for(i=0; i<512; i++) //send 512 bytes data
SPI_Send8(buffer[i],SD_SPI_PORT);
SPI_Send8(0xff,SD_SPI_PORT); //transmit dummy CRC (16-bit), CRC is ignored here
SPI_Send8(0xff,SD_SPI_PORT);
response = SPI_Receive8(SD_SPI_PORT);
if( (response & 0x1f) != 0x05) //response= 0xXXX0AAA1 ; AAA='010' - data accepted
{ //AAA='101'-data rejected due to CRC error
SD_CS_DEASSERT; //AAA='110'-data rejected due to write error
return(response);
}
while(!SPI_Receive8(SD_SPI_PORT)) //wait for SD card to complete writing and get idle
if(retry++ > 0xfffe)
{
SD_CS_DEASSERT;
return(1);
}
SD_CS_DEASSERT;
SPI_Send8(0xff,SD_SPI_PORT); //just spend 8 clock cycle delay before reasserting the CS line
SD_CS_ASSERT; //re-asserting the CS line to verify if card is still busy
while(!SPI_Receive8(SD_SPI_PORT)) //wait for SD card to complete writing and get idle
if(retry++ > 0xfffe)
{
SD_CS_DEASSERT;
return(1);
}
SD_CS_DEASSERT;
if(Atomic)
{
LIS_SD_DEATOMIZE; // disable INT0 to make it quasi atomic
}
return(0);
}
//******************************************************************
//Function: to read a single block from SD card
//Arguments: none
//return: unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
unsigned char SD_readSingleBlock(unsigned long startBlock) {
unsigned char response;
unsigned int i, retry=0;
response = SD_sendCommand(READ_SINGLE_BLOCK, startBlock<<9);
//read a Block command
//block address converted to starting address of 512 byte Block
if(response != 0x00) {
//check for SD status: 0x00 - OK (No flags set)
return response;
}
SD_CS_ASSERT;
while(SPI_receive() != 0xfe) {
//wait for start block token 0xfe (0x11111110)
if(retry++ > 0xfffe) {
SD_CS_DEASSERT;
return 1;
} //return if time-out
}
for(i=0; i<512; i++) {
//read 512 bytes
buffer[i] = SPI_receive();
}
SPI_receive(); //receive incoming CRC (16-bit), CRC is ignored here
SPI_receive();
SPI_receive(); //extra 8 clock pulses
SD_CS_DEASSERT;
return 0;
}
//******************************************************************
//Function : to read a single block from SD card
//Arguments : none
//return : unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
unsigned char SD_readSingleBlock(unsigned long startBlock, char buffer[BLOCK])
{
unsigned char response;
unsigned int i, retry=0;
response = SD_sendCommand(READ_SINGLE_BLOCK, startBlock); //read a Block command
if(response != 0x00) return response; //check for SD status: 0x00 - OK (No flags set)
SD_CS_ASSERT;
retry = 0;
while(SpiReceive() != 0xfe) //wait for start block token 0xfe (0x11111110)
if(retry++ > 0xfffe){SD_CS_DEASSERT; return 1;} //return if time-out
for(i=0; i<BLOCK; i++) //read 512 bytes
buffer[i] = SpiReceive();
SpiReceive(); //receive incoming CRC (16-bit), CRC is ignored here
SpiReceive();
SpiReceive(); //extra 8 clock pulses
SD_CS_DEASSERT;
return 0;
}
uint8_t SD_Idle(uint8_t power)
{
uint8_t response, retry = 0;
SPI_LOW_SPEED;
SD_CS_ASSERT;
do
{
response = SD_sendCommand(GO_IDLE_STATE, 0); //send 'reset & go idle' command
retry++;
if(retry>0x20)
return(0xff); //time out, card not detected
} while(response != 0x01);
SD_CS_DEASSERT;
SPI_Send8(0xff,SD_SPI_PORT);
SPI_Send8(0xff,SD_SPI_PORT);
if(power)
{
SD_Status |= SDSTAT_IDLE;
return(1);
}
SD_POWER_OFF; // switch off power for SD card
SPI_Init(SPI_SD_OFF); // disable SPI and tristate the port
// SD_Status |= SDSTAT_NOTINIT; // only if first time powered on - checking the type of card after init!!!
SD_Status &= ~(SDSTAT_INIT | SDSTAT_POWER);
return(0);
}
//******************************************************************
//Function : to read a single block from SD card
//Arguments : none
//return : unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
unsigned char SD_readSingleBlock(unsigned long startBlock)
{
unsigned char response;
unsigned int i, retry=0;
//transmitString_F(PSTR("\nSD_readsingleBlock send command READ_SINGLE_BLOCK"));
response = SD_sendCommand(READ_SINGLE_BLOCK, startBlock); //read a Block command
if(response != 0x00) return response; //check for SD status: 0x00 - OK (No flags set)
SD_CS_ASSERT;
//transmitString_F(PSTR("\nSD_readsingleBlock SD status "));
retry = 0;
while(receiveByte_SPI() != 0xfe) //wait for start block token 0xfe (0x11111110)
if(retry++ > 0xfffe){SD_CS_DEASSERT; return 1;} //return if time-out
for(i=0; i<512; i++) //read 512 bytes
buffer[i] = receiveByte_SPI();
//transmitString_F(PSTR("\nSD_readsingleBlock After filling buffer"));
receiveByte_SPI(); //receive incoming CRC (16-bit), CRC is ignored here
receiveByte_SPI();
receiveByte_SPI(); //extra 8 clock pulses
SD_CS_DEASSERT;
//transmitString_F(PSTR("\nSD_readsingleBlock ending"));
return 0;
}
unsigned char SD_readSingleBlock(unsigned long startBlock)
{
unsigned char response;
unsigned int i, retry=0;
response = SD_sendCommand(READ_SINGLE_BLOCK, startBlock); /**read a Block command*/
if(response != 0x00) return response; /**check if SD status: 0x00 - OK (no flag activated)*/
SD_CS_ASSERT;
retry = 0;
while(SPI_receive() != 0xfe) /**wait for start block to get the 0xfe value*/
if(retry++ > 0xfffe){
SD_CS_DEASSERT;
return 1; } /**function output time-out*/
for(i=0; i<512; i++) /**read every 512 bytes*/
buffer[i] = SPI_receive();
SPI_receive(); /**let 8 clock pulses*/
SD_CS_DEASSERT;
return 0;
}
//******************************************************************
//Function : to read a single block from SD card
//Arguments : none
//return : unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
unsigned char SD_readSingleBlock(char *inputbuffer,uint32_t startBlock)
{
unsigned char response;
uint16_t i, retry=0;
response = SD_sendCommand(READ_SINGLE_BLOCK, startBlock); //read a Block command
if(response != 0x00)
{
return response; //check for SD status: 0x00 - OK (No flags set)
}
SPI_EnableChipSelect();
retry = 0;
while(SPI_Read() != 0xfe) //wait for start block token 0xfe (0x11111110)
{
if(retry++ > 0xfffe)
{
SPI_DisableChipSelect();
return 1; //return if time-out
}
}
for(i=0; i<512; i++) //read 512 bytes
inputbuffer[i] = SPI_Read();
SPI_Read(); //receive incoming CRC (16-bit), CRC is ignored here
SPI_Read();
SPI_Read(); //extra 8 clock pulses
SPI_DisableChipSelect();
return 0;
}
void init_SD(void)
{
unsigned char i, response, retry=0 ;
ENABLE_SD;
do
{
for(i=0;i<10;i++)
SPI_sendchar(0xff);
response = SD_sendCommand(GO_IDLE_STATE, 0); //send 'reset & go idle' command
retry++;
if(retry>0xfe)
{
printString("SD init fail..Code: ");
printByte(response);
printString("Retry: ");
printByte(retry);
printString("\r\n");
return ;
} //time out
} while(response != 0x01);
DISABLE_SD;
SPI_sendchar (0xff);
SPI_sendchar (0xff);
retry = 0;
do
{
response = SD_sendCommand(SEND_OP_COND, 0); //activate card's initialization process
response = SD_sendCommand(SEND_OP_COND, 0); //same command sent again for compatibility with some cards
retry++;
if(retry>0xfe)
{
printString("SD Failed: SEND_OP_COND\r\n");
return ; //time out
}
}while(response);
SD_sendCommand(CRC_ON_OFF, 0); //disable CRC; deafault - CRC disabled in SPI mode
SD_sendCommand(SET_BLOCK_LEN, 512); //set block size to 512
printString("SD initialized\r\n");
return;
}
//******************************************************************
//Function: to write to a single block of SD card
//Arguments: none
//return: unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
unsigned char SD_writeSingleBlock(unsigned long startBlock) {
unsigned char response;
unsigned int i, retry=0;
response = SD_sendCommand(WRITE_SINGLE_BLOCK, startBlock<<9);
//write a Block command
if(response != 0x00) {
//check for SD status: 0x00 - OK (No flags set)
return response;
}
SD_CS_ASSERT;
SPI_transmit(0xfe); //Send start block token 0xfe (0x11111110)
for(i=0; i<512; i++) {
//send 512 bytes data
SPI_transmit(buffer[i]);
}
SPI_transmit(0xff); //transmit dummy CRC (16-bit), CRC is ignored here
SPI_transmit(0xff);
response = SPI_receive();
if( (response & 0x1f) != 0x05) {
//response= 0xXXX0AAA1 ; AAA='010' - data accepted
//AAA='101'-data rejected due to CRC error
SD_CS_DEASSERT;
//AAA='110'-data rejected due to write error
return response;
}
while(!SPI_receive()) {
//wait for SD card to complete writing and get idle
if(retry++ > 0xfffe) {
SD_CS_DEASSERT;
return 1;
}
}
SD_CS_DEASSERT;
SPI_transmit(0xff);
//just spend 8 clock cycle delay before reasserting the CS line
SD_CS_ASSERT;
//re-asserting the CS line to verify if card is still busy
while(!SPI_receive()) {
//wait for SD card to complete writing and get idle
if(retry++ > 0xfffe) {
SD_CS_DEASSERT;
return 1;
}
}
SD_CS_DEASSERT;
return 0;
}
unsigned char SD_erase (unsigned long startBlock, unsigned long totalBlocks)
{
unsigned char response;
response = SD_sendCommand(ERASE_BLOCK_START_ADDR, startBlock); /**send address of starting block*/
if(response != 0x00) /**check the SD status: 0x00 - OK (No flags set)*/
return response;
response = SD_sendCommand(ERASE_BLOCK_END_ADDR,(startBlock + totalBlocks - 1)); /**send adress of end block*/
if(response != 0x00) /**check the SD status: 0x00 - OK (No flags set)*/
return response;
response = SD_sendCommand(ERASE_SELECTED_BLOCKS, 0); /**erase all selected blocks*/
if(response != 0x00) /**check SD status: 0x00 - OK (No flags set)*/
return response;
return 0; //normal return
}
//*****************************************************************
//Function : to erase specified no. of blocks of SD card
//Arguments : none
//return : uint8_t; will be 0 if no error,
// otherwise the response byte will be sent
//*****************************************************************
uint8_t SD_erase (uint32_t startBlock, uint32_t totalBlocks)
{
uint8_t response;
response = SD_sendCommand(ERASE_BLOCK_START_ADDR, startBlock); //send starting block address
if(response != 0x00) //check for SD status: 0x00 - OK (No flags set)
return(response);
response = SD_sendCommand(ERASE_BLOCK_END_ADDR,(startBlock + totalBlocks - 1)); //send end block address
if(response != 0x00)
return(response);
response = SD_sendCommand(ERASE_SELECTED_BLOCKS, 0); //erase all selected blocks
if(response != 0x00)
return(response);
return(0); //normal return
}
//*****************************************************************
//Function : to erase specified no. of blocks of SD card
//Arguments : none
//return : unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//*****************************************************************
unsigned char SD_erase (unsigned long startBlock, unsigned long totalBlocks)
{
unsigned char response;
response = SD_sendCommand(ERASE_BLOCK_START_ADDR, startBlock); //send starting block address
if(response != 0x00) //check for SD status: 0x00 - OK (No flags set)
return response;
response = SD_sendCommand(ERASE_BLOCK_END_ADDR,(startBlock + totalBlocks - 1)); //send end block address
if(response != 0x00)
return response;
response = SD_sendCommand(ERASE_SELECTED_BLOCKS, 0); //erase all selected blocks
if(response != 0x00)
return response;
return 0; //normal return
}
unsigned char SD_readSingleBlock(unsigned long startBlock)
{
/*int i;
uint16_t ix;
char r1 = Command(0x51,0,512,0xFF);
for (ix = 0; ix < 50000; ix++) {
if (r1 == (char)0x00) break;
r1 = SPI_sendchar(0xFF);
}
if (r1 != (char)0x00) {
return 1;
}
//read from the card will start after the framework
while(SPI_sendchar(0xFF) != (char)0xFE);
for(i=0; i < 512; i++) {
while(!(SPSR & (1<<SPIF)));
buffer[i] = SPDR;
SPDR = SPI_sendchar(0xFF);
}
SPI_sendchar(0xFF);
SPI_sendchar(0xFF);
return 0;*/
unsigned char response;
unsigned int i, retry=0;
response = SD_sendCommand(READ_SINGLE_BLOCK, startBlock<<9); //read a Block command
//block address converted to starting address of 512 byte Block
if(response != 0x00) //check for SD status: 0x00 - OK (No flags set)
return response;
ENABLE_SD;
retry = 0;
while(SPI_sendchar(0xFF) != 0xfe) //wait for start block token 0xfe (0x11111110)
{
if(retry++ > 0xfffe)
{
printString("Error reading\r\n");
DISABLE_SD;
return 1;
} //return if time-out
}
for(i=0; i<512; i++) //read 512 bytes
buffer[i] = SPI_sendchar(0xFF);
SPI_sendchar(0xFF); //receive incoming CRC (16-bit), CRC is ignored here
SPI_sendchar(0xFF);
SPI_sendchar(0xFF); //extra 8 clock pulses
DISABLE_SD;
//printString("Reading succesful\r\n");
return 0;
}
//******************************************************************
//Function : to write to a single block of SD card
//Arguments : none
//return : unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
unsigned char SD_writeSingleBlock(char *inputbuffer,uint32_t startBlock)
{
unsigned char response;
uint16_t i, retry=0;
response = SD_sendCommand(WRITE_SINGLE_BLOCK, startBlock); //write a Block command
if(response != 0x00) return response; //check for SD status: 0x00 - OK (No flags set)
SPI_EnableChipSelect();
SPI_Write(0xfe); //Send start block token 0xfe (0x11111110)
for(i=0; i<512; i++) //send 512 bytes data
SPI_Write(inputbuffer[i]);
SPI_Write(0xff); //transmit dummy CRC (16-bit), CRC is ignored here
SPI_Write(0xff);
response = SPI_Read();
if( (response & 0x1f) != 0x05) //response= 0xXXX0AAA1 ; AAA='010' - data accepted
{ //AAA='101'-data rejected due to CRC error
SPI_DisableChipSelect(); //AAA='110'-data rejected due to write error
return response;
}
while(!SPI_Read()) //wait for SD card to complete writing and get idle
{
if(retry++ > 0xfffe)
{
SPI_DisableChipSelect();
return 1;
}
}
SPI_DisableChipSelect();
SPI_Write(0xff); //just spend 8 clock cycle delay before reasserting the CS line
SPI_EnableChipSelect(); //re-asserting the CS line to verify if card is still busy
while(!SPI_Read()) //wait for SD card to complete writing and get idle
{
if(retry++ > 0xfffe)
{
SPI_DisableChipSelect();
return 1;
}
}
SPI_DisableChipSelect();
return 0;
}
unsigned char SD_writeSingleBlock(unsigned long startBlock)
{
unsigned char response;
unsigned int i, retry=0;
response = SD_sendCommand(WRITE_SINGLE_BLOCK, startBlock); /** block's writing command*/
if(response != 0x00) return response; /**check if SD status: 0x00 - OK (no flag activated)*/
SD_CS_ASSERT;
SPI_transmit(0xfe); /**send the 0xfe block (page 197 datasheet SD)*/
for(i=0; i<512; i++) /**send the 512 bytes data*/
SPI_transmit(buffer[i]);
SPI_transmit(0xff); //transmit dummy CRC (16-bit), CRC is ignored here
SPI_transmit(0xff);
response = SPI_receive();
if( (response & 0x1f) != 0x05) /**response= 0xXXX0AAA1 ; if: { AAA='010' - data accepted
AAA='101'-data rejected due to CRC error
AAA='110'-data rejected due to write error
}*/
{
SD_CS_DEASSERT;
return response;
}
while(!SPI_receive()) /**wait for SD card to complete the writing and go to get idle state*/
if(retry++ > 0xfffe){SD_CS_DEASSERT; return 1;} /**function output time-out*/
SD_CS_DEASSERT;
SPI_transmit(0xff); /**allow a 8 clock cycles delay before CS line reaffirming*/
SD_CS_ASSERT; /**CS line reaffirming to check if the card is still busy*/
while(!SPI_receive()) /**wait for SD card to complete the writing and go to get idle state*/
if(retry++ > 0xfffe){
SD_CS_DEASSERT; return 1;
}
SD_CS_DEASSERT;
return 0;
}
//******************************************************************
//Function : to read a single block from SD card
//Arguments : none
//return : uint8_t; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
uint8_t SD_readSingleBlock(uint32_t startBlock) //, uint8_t atomic)
{
uint8_t response;
uint16_t i, retry=0;
if(Atomic)
{
LIS_SD_ATOMIZE; // disable INT0 to make it quasi atomic
}
response = SD_sendCommand(READ_SINGLE_BLOCK, startBlock); //read a Block command
if(response != 0x00)
return(response); //check for SD status: 0x00 - OK (No flags set)
SD_CS_ASSERT;
retry = 0;
while(SPI_Receive8(SD_SPI_PORT) != 0xfe) //wait for start block token 0xfe (0x11111110)
if(retry++ > 0xfffe)
{
SD_CS_DEASSERT;
return(1);
} //return if time-out
for(i=0; i<512; i++) //read 512 bytes
buffer[i] = SPI_Receive8(SD_SPI_PORT);
SPI_Receive8(SD_SPI_PORT); //receive incoming CRC (16-bit), CRC is ignored here
SPI_Receive8(SD_SPI_PORT);
SPI_Receive8(SD_SPI_PORT); //extra 8 clock pulses
SD_CS_DEASSERT;
if(Atomic)
{
LIS_SD_DEATOMIZE; // disable INT0 to make it quasi atomic
}
return(0);
}
unsigned char SD_writeSingleBlock(unsigned long startBlock)
{
uint8_t wbr;
unsigned char response;
unsigned int i;
DISABLE_SD;
response = SD_sendCommand(24, startBlock<<9); //write a Block command
if(response != 0x00) //check for SD status: 0x00 - OK (No flags set)
return response;
ENABLE_SD;
SPI_sendchar(0xfe); //Send start block token 0xfe (0x11111110)
for(i=0; i<512; i++) //send 512 bytes data
{
SPI_sendchar(buffer[i]);
//SPI_sendchar(0x12);
}
SPI_sendchar(0xff); //transmit dummy CRC (16-bit), CRC is ignored here
SPI_sendchar(0xff);
wbr = SPI_sendchar(0xff);
//write block response and testing error
wbr &= 0x1F;
//zeroing top three indeterminate bits 0b.0001.1111
if (wbr != 0x05)
{
printString("ERooR\r\n");
printByte(wbr);
return 1;
}
while(SPI_sendchar(0xFF) != (char)0xFF);
//printString("File writed\r\n");
//wait for the completion of a write operation to the card
DISABLE_SD;
return 0;
}
/*
* fct_SDCard.c
*
* Created on: 21 juin 2016
* Author: formateur
*/
#include <avr/io.h>
#include <util/delay.h>
#include "../lib/usart.h"
#include "../lib/fct_spi.h"
#include "../lib/fct_SDCard.h"
//******************************************************************
//Function : to initialize the SD/SDHC card in SPI mode
//Arguments : none
//return : unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
unsigned char SD_init(void)
{
unsigned char response, SD_version;
unsigned int retry=0 ;
int i=0;
//Spi init
spi_init(); /**send init on spi peripheral**/
for(i=0;i<10;i++){
SD_CS_ASSERT; /**set chip select*/
do
{
response = SD_sendCommand(GO_IDLE_STATE, 0); /**send software reset */
retry++;
if(retry>0x20){
//
USART0_print("\rpas de carte\n");
//
return 1; /**time out, card not detected*/
}
} while(response != 0x01); /**response= 0x01 : card in idle state and no error*/
SD_CS_DEASSERT;
SPI_transmit (0xff); /**1st byte transmission */
SPI_transmit (0xff); /**2nd byte transmission */
retry = 0; /**reset retries counter*/
SD_version = 2; //default set to SD compliance with ver2.x;
//this may change after checking the next command
do
{
response = SD_sendCommand(SEND_IF_COND,0x000001AA); /**check power supply status,for SDHC card*/
retry++;
if(retry>0xfe)
{
SD_version = 1;
cardType = 1;
break;
} //time out
}while(response != 0x01);
retry = 0;
do
{
response = SD_sendCommand(APP_CMD,0); //CMD55, must be sent before sending any ACMD command
response = SD_sendCommand(SD_SEND_OP_COND,0x40000000); //ACMD41
retry++;
if(retry>0xfe)
{
USART0_print("\rinitialisation a échoué\n");
return 2; //time out, card initialization failed
}
}while(response != 0x00);
retry = 0;
SDHC_flag = 0;
if (SD_version == 2)
{
do
{
response = SD_sendCommand(READ_OCR,0);
retry++;
if(retry>0xfe)
{
cardType = 0;
break;
} //time out
}while(response != 0x00);
if(SDHC_flag == 1) cardType = 2;
else cardType = 3;
}
//SD_sendCommand(CRC_ON_OFF, OFF); //disable CRC; deafault - CRC disabled in SPI mode
//SD_sendCommand(SET_BLOCK_LEN, 512); //set block size to 512; default size is 512
//
switch (cardType) /** switch for card type (to check communication with the card)*/
{
case 1 : USART0_print("\rver1.x\n");break;
case 2 : USART0_print("\rSDHC\n");break;
case 3 : USART0_print("\rver2.x\n");break;
default : USART0_print("runknown Sd card\n");
}
//
return 0;break; /**successful return*/
}
_delay_ms(1); /**give some time to end the init*/
return 0;
}
//******************************************************************
//Function : to send a command to SD card
//Arguments : unsigned char (8-bit command value)
// & unsigned long (32-bit command argument)
//return : unsigned char; response byte
//******************************************************************
unsigned char SD_sendCommand(unsigned char cmd, unsigned long arg)
{
unsigned char response, retry=0, status;
//SD card accepts byte address while SDHC accepts block address in multiples of 512
//so, if it's SD card we need to convert block address into corresponding byte address by
//multipying it with 512. which is equivalent to shifting it left 9 times
//following 'if' loop does that
if(SDHC_flag == 0)
if(cmd == READ_SINGLE_BLOCK ||
cmd == READ_MULTIPLE_BLOCKS ||
cmd == WRITE_SINGLE_BLOCK ||
cmd == WRITE_MULTIPLE_BLOCKS ||
cmd == ERASE_BLOCK_START_ADDR||
cmd == ERASE_BLOCK_END_ADDR )
{
arg = arg << 9;
}
SD_CS_ASSERT;
SPI_transmit(cmd | 0x40); //send command, first two bits always '01'
SPI_transmit(arg>>24);
SPI_transmit(arg>>16);
SPI_transmit(arg>>8);
SPI_transmit(arg);
if(cmd == SEND_IF_COND) //it is compulsory to send correct CRC for CMD8 (CRC=0x87) & CMD0 (CRC=0x95)
SPI_transmit(0x87); //for remaining commands, CRC is ignored in SPI mode
else
SPI_transmit(0x95);
while((response = SPI_receive()) == 0xff) //wait response
if(retry++ > 0xfe) break; //time out error
if(response == 0x00 && cmd == 58) //checking response of CMD58
{
status = SPI_receive() & 0x40; //first byte of the OCR register (bit 31:24)
if(status == 0x40) SDHC_flag = 1; //we need it to verify SDHC card
else SDHC_flag = 0;
SPI_receive(); //remaining 3 bytes of the OCR register are ignored here
SPI_receive(); //one can use these bytes to check power supply limits of SD
SPI_receive();
}
SPI_receive(); //extra 8 CLK
SD_CS_DEASSERT;
return response; //return state
}
//*****************************************************************
//Function : to erase specified no. of blocks of SD card
//Arguments : none
//return : unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//*****************************************************************
unsigned char SD_erase (unsigned long startBlock, unsigned long totalBlocks)
{
unsigned char response;
response = SD_sendCommand(ERASE_BLOCK_START_ADDR, startBlock); /**send address of starting block*/
if(response != 0x00) /**check the SD status: 0x00 - OK (No flags set)*/
return response;
response = SD_sendCommand(ERASE_BLOCK_END_ADDR,(startBlock + totalBlocks - 1)); /**send adress of end block*/
if(response != 0x00) /**check the SD status: 0x00 - OK (No flags set)*/
return response;
response = SD_sendCommand(ERASE_SELECTED_BLOCKS, 0); /**erase all selected blocks*/
if(response != 0x00) /**check SD status: 0x00 - OK (No flags set)*/
return response;
return 0; //normal return
}
//******************************************************************
//Function : to read a single block from SD card
//Arguments : none
//return : unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
unsigned char SD_readSingleBlock(unsigned long startBlock)
{
unsigned char response;
unsigned int i, retry=0;
response = SD_sendCommand(READ_SINGLE_BLOCK, startBlock); /**read a Block command*/
if(response != 0x00) return response; /**check if SD status: 0x00 - OK (no flag activated)*/
SD_CS_ASSERT;
retry = 0;
while(SPI_receive() != 0xfe) /**wait for start block to get the 0xfe value*/
if(retry++ > 0xfffe){
SD_CS_DEASSERT;
return 1; } /**function output time-out*/
for(i=0; i<512; i++) /**read every 512 bytes*/
buffer[i] = SPI_receive();
SPI_receive(); /**let 8 clock pulses*/
SD_CS_DEASSERT;
return 0;
}
//******************************************************************
//Function : to write to a single block of SD card
//return : unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
unsigned char SD_writeSingleBlock(unsigned long startBlock)
{
unsigned char response;
unsigned int i, retry=0;
response = SD_sendCommand(WRITE_SINGLE_BLOCK, startBlock); /** block's writing command*/
if(response != 0x00) return response; /**check if SD status: 0x00 - OK (no flag activated)*/
SD_CS_ASSERT;
SPI_transmit(0xfe); /**send the 0xfe block (page 197 datasheet SD)*/
for(i=0; i<512; i++) /**send the 512 bytes data*/
SPI_transmit(buffer[i]);
SPI_transmit(0xff); //transmit dummy CRC (16-bit), CRC is ignored here
SPI_transmit(0xff);
response = SPI_receive();
if( (response & 0x1f) != 0x05) /**response= 0xXXX0AAA1 ; if: { AAA='010' - data accepted
AAA='101'-data rejected due to CRC error
AAA='110'-data rejected due to write error
}*/
{
SD_CS_DEASSERT;
return response;
}
while(!SPI_receive()) /**wait for SD card to complete the writing and go to get idle state*/
if(retry++ > 0xfffe){SD_CS_DEASSERT; return 1;} /**function output time-out*/
SD_CS_DEASSERT;
SPI_transmit(0xff); /**allow a 8 clock cycles delay before CS line reaffirming*/
SD_CS_ASSERT; /**CS line reaffirming to check if the card is still busy*/
while(!SPI_receive()) /**wait for SD card to complete the writing and go to get idle state*/
if(retry++ > 0xfffe){
SD_CS_DEASSERT; return 1;
}
SD_CS_DEASSERT;
return 0;
}
#ifndef FAT_TESTING_ONLY
//***************************************************************************/
//Function : to read multiple blocks from SD card & send every block to UART
//Arguments : none
//return : unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//****************************************************************************/
unsigned char SD_readMultipleBlock (unsigned long startBlock, unsigned long totalBlocks)
{
unsigned char response;
unsigned int i, retry=0;
retry = 0;
response = SD_sendCommand(READ_MULTIPLE_BLOCKS, startBlock); //write a Block command
if(response != 0x00) return response; //check for SD status: 0x00 - OK (No flags set)
SD_CS_ASSERT;
while( totalBlocks )
{
retry = 0;
while(SPI_receive() != 0xfe) //wait for start block token 0xfe (0x11111110)
if(retry++ > 0xfffe){SD_CS_DEASSERT; return 1;} //return if time-out
for(i=0; i<512; i++) //read 512 bytes
buffer[i] = SPI_receive();
SPI_receive(); //receive incoming CRC (16-bit), CRC is ignored here
SPI_receive();
SPI_receive(); //extra 8 cycles
TX_NEWLINE;
transmitString_F(PSTR(" --------- "));
TX_NEWLINE;
for(i=0; i<512; i++) //send the block to UART
{
if(buffer[i] == '~') break;
transmitByte ( buffer[i] );
}
TX_NEWLINE;
transmitString_F(PSTR(" --------- "));
TX_NEWLINE;
totalBlocks--;
}
SD_sendCommand(STOP_TRANSMISSION, 0); //command to stop transmission
SD_CS_DEASSERT;
SPI_receive(); //extra 8 clock pulses
return 0;
}
//***************************************************************************/
//Function: to receive data from UART and write to multiple blocks of SD card
//Arguments: none
//return: unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//****************************************************************************/
unsigned char SD_writeMultipleBlock(unsigned long startBlock, unsigned long totalBlocks)
{
unsigned char response, data;
unsigned int i, retry=0;
unsigned long blockCounter=0, size;
response = SD_sendCommand(WRITE_MULTIPLE_BLOCKS, startBlock); //write a Block command
if(response != 0x00) return response; //check for SD status: 0x00 - OK (No flags set)
SD_CS_ASSERT;
TX_NEWLINE;
transmitString_F(PSTR(" Enter text (End with ~): "));
TX_NEWLINE;
while( blockCounter < totalBlocks )
{//e. Cette librairie est dépendante de la librairie SPI. Voici le code à m
i=0;
do
{
data = receiveByte();
if(data == 0x08) //'Back Space' key pressed
{
if(i != 0)
{
transmitByte(data);
transmitByte(' ');
transmitByte(data);
i--;
size--;
}
continue;
}
transmitByte(data);
buffer[i++] = data;
if(data == 0x0d)
{
transmitByte(0x0a);
buffer[i++] = 0x0a;
}
if(i == 512) break;
}while (data != '~');
TX_NEWLINE;
transmitString_F(PSTR(" ---- "));
TX_NEWLINE;
SPI_transmit(0xfc); //Send start block token 0xfc (0x11111100)
for(i=0; i<512; i++) //send 512 bytes data
SPI_transmit( buffer[i] );
SPI_transmit(0xff); //transmit dummy CRC (16-bit), CRC is ignored here
SPI_transmit(0xff);
response = SPI_receive();
if( (response & 0x1f) != 0x05) //response= 0xXXX0AAA1 ; AAA='010' - data accepted
{ //AAA='101'-data rejected due to CRC error
SD_CS_DEASSERT; //AAA='110'-data rejected due to write error
return response;
}
while(!SPI_receive()) //wait for SD card to complete writing and get idle
if(retry++ > 0xfffe){SD_CS_DEASSERT; return 1;}
SPI_receive(); //extra 8 bits
blockCounter++;
}
SPI_transmit(0xfd); //send 'stop transmission token'
retry = 0;
if(data == '~')
{
fileSize--; //to remove the last entered '~' character
i--;
for(;i<512;i++) //fill the rest of the buffer with 0x00
buffer[i]= 0x00;
error = SD_writeSingleBlock (startBlock);
txString(_COM1, "data = ~\n");
break;
}
while(!SPI_receive()) //wait for SD card to complete writing and get idle
if(retry++ > 0xfffe){SD_CS_DEASSERT; return 1;}
SD_CS_DEASSERT;
SPI_transmit(0xff); //just spend 8 clock cycle delay before reasserting the CS signal
SD_CS_ASSERT; //re assertion of the CS signal is required to verify if card is still busy
while(!SPI_receive()) //wait for SD card to complete writing and get idle
if(retry++ > 0xfffe){SD_CS_DEASSERT; return 1;}
SD_CS_DEASSERT;
return 0;
}
//******************************************************************
//Function : to initialize the SD/SDHC card in SPI mode
//Arguments : none
//return : unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
unsigned char SD_init(void)
{
unsigned char response, SD_version;
unsigned int retry=0 ;
int i=0;
//Spi init
spi_init(); /**send init on spi peripheral**/
for(i=0;i<10;i++){
SD_CS_ASSERT; /**set chip select*/
do
{
response = SD_sendCommand(GO_IDLE_STATE, 0); /**send software reset */
retry++;
if(retry>0x20){
//
USART0_print("\rpas de carte\n");
//
return 1; /**time out, card not detected*/
}
} while(response != 0x01); /**response= 0x01 : card in idle state and no error*/
SD_CS_DEASSERT;
SPI_transmit (0xff); /**1st byte transmission */
SPI_transmit (0xff); /**2nd byte transmission */
retry = 0; /**reset retries counter*/
SD_version = 2; //default set to SD compliance with ver2.x;
//this may change after checking the next command
do
{
response = SD_sendCommand(SEND_IF_COND,0x000001AA); /**check power supply status,for SDHC card*/
retry++;
if(retry>0xfe)
{
SD_version = 1;
cardType = 1;
break;
} //time out
}while(response != 0x01);
retry = 0;
do
{
response = SD_sendCommand(APP_CMD,0); //CMD55, must be sent before sending any ACMD command
response = SD_sendCommand(SD_SEND_OP_COND,0x40000000); //ACMD41
retry++;
if(retry>0xfe)
{
USART0_print("\rinitialisation a échoué\n");
return 2; //time out, card initialization failed
}
}while(response != 0x00);
retry = 0;
SDHC_flag = 0;
if (SD_version == 2)
{
do
{
response = SD_sendCommand(READ_OCR,0);
retry++;
if(retry>0xfe)
{
cardType = 0;
break;
} //time out
}while(response != 0x00);
if(SDHC_flag == 1) cardType = 2;
else cardType = 3;
}
//SD_sendCommand(CRC_ON_OFF, OFF); //disable CRC; deafault - CRC disabled in SPI mode
//SD_sendCommand(SET_BLOCK_LEN, 512); //set block size to 512; default size is 512
//
switch (cardType) /** switch for card type (to check communication with the card)*/
{
case 1 : USART0_print("\rver1.x\n");break;
case 2 : USART0_print("\rSDHC\n");break;
case 3 : USART0_print("\rver2.x\n");break;
default : USART0_print("runknown Sd card\n");
}
//
return 0;break; /**successful return*/
}
_delay_ms(1); /**give some time to end the init*/
return 0;
}
//******************************************************************
//Function : to initialize the SD/SDHC card in SPI mode
//Arguments : none
//return : unsigned char; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
unsigned char SD_init(unsigned char *cardType){
unsigned char i, response, SD_version;
unsigned int retry=0 ;
for(i=0;i<10;i++)
SpiTransmit(0xff); //80 clock pulses spent before sending the first command
SD_CS_ASSERT;
do
{
response = SD_sendCommand(GO_IDLE_STATE, 0); //send 'reset & go idle' command
retry++;
if(retry>0x20)
return 1; //time out, card not detected
} while(response != 0x01);
SD_CS_DEASSERT;
SpiTransmit (0xff);
SpiTransmit (0xff);
retry = 0;
SD_version = 2; //default set to SD compliance with ver2.x;
//this may change after checking the next command
do
{
response = SD_sendCommand(SEND_IF_COND,0x000001AA); //Check power supply status, mandatory for SDHC card
retry++;
if(retry>0xfe)
{
SD_version = 1;
*cardType = 1;
break;
} //time out
}while(response != 0x01);
retry = 0;
do
{
response = SD_sendCommand(APP_CMD,0); //CMD55, must be sent before sending any ACMD command
response = SD_sendCommand(SD_SEND_OP_COND,0x40000000); //ACMD41
retry++;
if(retry>0xfe)
{
return 2; //time out, card initialization failed
}
}while(response != 0x00);
retry = 0;
SDHC_flag = 0;
if (SD_version == 2)
{
do
{
response = SD_sendCommand(READ_OCR,0);
retry++;
if(retry>0xfe)
{
*cardType = 0;
break;
} //time out
}while(response != 0x00);
if(SDHC_flag == 1) *cardType = 2;
else *cardType = 3;
}
//SD_sendCommand(CRC_ON_OFF, OFF); //disable CRC; deafault - CRC disabled in SPI mode
//SD_sendCommand(SET_BLOCK_LEN, 512); //set block size to 512; default size is 512
return 0; //successful return
}
uint8_t init_SdCard(uint8_t *cardType)
{
uint8_t i, response, sd_version;
uint16_t retry=0 ;
for(i=0;i<10;i++)
SPI_Write(0xff); //80 clock pulses spent before sending the first command
SPI_EnableChipSelect();
do
{
response = SD_sendCommand(GO_IDLE_STATE, 0); //send 'reset & go idle' command
retry++;
if(retry>0x20)
return SDCARD_NOT_DETECTED; //time out, card not detected
} while(response != 0x01);
SPI_DisableChipSelect();
SPI_Write (0xff);
SPI_Write (0xff);
retry = 0;
sd_version = 2; //default set to SD compliance with ver2.x;
//this may change after checking the next command
do
{
response = SD_sendCommand(SEND_IF_COND,0x000001AA); //Check power supply status, mendatory for SDHC card
retry++;
if(retry>0xfe)
{
sd_version = 1;
*cardType = SDCARD_TYPE_STANDARD;
break;
} //time out
}while(response != 0x01);
retry = 0;
do
{
response = SD_sendCommand(APP_CMD,0); //CMD55, must be sent before sending any ACMD command
response = SD_sendCommand(SD_SEND_OP_COND,0x40000000); //ACMD41
retry++;
if(retry>0xfe)
{
return SDCARD_INIT_FAILED; //time out, card initialization failed
}
}while(response != 0x00);
retry = 0;
V_SdHighcapacityFlag_u8 = 0;
if (sd_version == 2)
{
do
{
response = SD_sendCommand(READ_OCR,0);
retry++;
if(retry>0xfe)
{
*cardType = SDCARD_TYPE_UNKNOWN;
break;
} //time out
}while(response != 0x00);
if(V_SdHighcapacityFlag_u8 == 1)
{
*cardType = SDCARD_TYPE_HIGH_CAPACITY;
}
else
{
*cardType = SDCARD_TYPE_STANDARD;
}
}
return response;
}
//***************************************************************************
//Function: to receive data from UART and write to multiple blocks of SD card
//Arguments: none
//return: uint8_t; will be 0 if no error,
// otherwise the response byte will be sent
//****************************************************************************
uint8_t SD_writeMultipleBlock(uint32_t startBlock, uint32_t totalBlocks)
{
uint8_t response, data = 0;
uint16_t i, retry=0;
uint32_t blockCounter=0;
response = SD_sendCommand(WRITE_MULTIPLE_BLOCKS, startBlock); //write a Block command
if(response != 0x00)
return(response); //check for SD status: 0x00 - OK (No flags set)
SD_CS_ASSERT;
// printf_P(PSTR("\n Enter text (End with ~): \n"));
while( blockCounter < totalBlocks )
{
i=0;
// do
// {
// data = receiveByte();
// if(data == 0x08) //'Back Space' key pressed
// {
// if(i != 0)
// {
// transmitByte(data);
// transmitByte(' ');
// transmitByte(data);
// i--;
// size--;
// }
// continue;
// }
// transmitByte(data);
buffer[i++] = data;
// if(data == 0x0d)
// {
// transmitByte(0x0a);
// buffer[i++] = 0x0a;
// }
// if(i == 512) break;
// }while (data != '~');
// printf_P(PSTR("\n ---- \n"));
SPI_Send8(0xfc,SD_SPI_PORT); //Send start block token 0xfc (0x11111100)
for(i=0; i<512; i++) //send 512 bytes data
SPI_Send8( buffer[i],SD_SPI_PORT);
SPI_Send8(0xff,SD_SPI_PORT); //transmit dummy CRC (16-bit), CRC is ignored here
SPI_Send8(0xff,SD_SPI_PORT);
response = SPI_Receive8(SD_SPI_PORT);
if( (response & 0x1f) != 0x05) //response= 0xXXX0AAA1 ; AAA='010' - data accepted
{ //AAA='101'-data rejected due to CRC error
SD_CS_DEASSERT; //AAA='110'-data rejected due to write error
return(response);
}
while(!SPI_Receive8(SD_SPI_PORT)) //wait for SD card to complete writing and get idle
if(retry++ > 0xfffe)
{
SD_CS_DEASSERT;
return(1);
}
SPI_Receive8(SD_SPI_PORT); //extra 8 bits
blockCounter++;
}
SPI_Send8(0xfd,SD_SPI_PORT); //send 'stop transmission token'
retry = 0;
while(!SPI_Receive8(SD_SPI_PORT)) //wait for SD card to complete writing and get idle
if(retry++ > 0xfffe)
{
SD_CS_DEASSERT;
return(1);
}
SD_CS_DEASSERT;
SPI_Send8(0xff,SD_SPI_PORT); //just spend 8 clock cycle delay before reasserting the CS signal
SD_CS_ASSERT; //re assertion of the CS signal is required to verify if card is still busy
while(!SPI_Receive8(SD_SPI_PORT)) //wait for SD card to complete writing and get idle
if(retry++ > 0xfffe)
{
SD_CS_DEASSERT;
return(1);
}
SD_CS_DEASSERT;
return(0);
}
//******************************************************************
//Function : to initialize the SD/SDHC card in SPI mode
//Arguments : uint8_t power 1 - already on, 2 - init
//return : uint8_t; will be 0 if no error,
// otherwise the response byte will be sent
//******************************************************************
uint8_t SD_Init(void)
{
uint8_t i, response, SD_version;
uint16_t retry=0 ;
SPI_Init(SPI_SD); // enable SPI and reinitialize SPI
SPI_LOW_SPEED;
// after each power up
if(!(SD_Status & SDSTAT_POWER))
{
SD_CS_DEASSERT; // pull high CS before starting the interface
SD_POWER_ON;
_delay_ms(10);
SD_Status |= SDSTAT_POWER;
for(i=0;i<10;i++)
SPI_Send8(0xff,SD_SPI_PORT); //80 clock pulses spent before sending the first command
SD_CS_ASSERT;
do
{
response = SD_sendCommand(GO_IDLE_STATE, 0); //send 'reset & go idle' command
retry++;
if(retry>0x20)
return(1); //time out, card not detected
} while(response != 0x01);
SD_CS_DEASSERT;
SPI_Send8(0xff,SD_SPI_PORT);
SPI_Send8(0xff,SD_SPI_PORT);
retry = 0;
SD_version = 2; //default set to SD compliance with ver2.x;
//this may change after checking the next command
do
{
response = SD_sendCommand(SEND_IF_COND,0x000001AA); //Check power supply status, mandatory for SDHC card
retry++;
if(retry>0xfe)
{
SD_version = 1;
cardType = 1;
break;
} //time out
}while(response != 0x01);
SD_Status |= SDSTAT_IDLE;
}
// only if activation from idle
if(SD_Status & SDSTAT_IDLE)
{
retry = 0;
do
{
response = SD_sendCommand(APP_CMD,0); //CMD55, must be sent before sending any ACMD command
response = SD_sendCommand(SD_SEND_OP_COND,0x40000000); //ACMD41
retry++;
if(retry>0xfe)
{
return 2; //time out, card initialization failed
}
}while(response != 0x00);
SD_Status &= ~SDSTAT_IDLE;
}
//only in init
if(SD_Status & SDSTAT_NOTINIT)
{
retry = 0;
SDHC_flag = 0;
if (SD_version == 2)
{
do
{
response = SD_sendCommand(READ_OCR,0);
retry++;
if(retry>0xfe)
{
cardType = 0;
break;
} //time out
}while(response != 0x00);
if(SDHC_flag == 1)
cardType = 2;
else
cardType = 3;
}
SD_Status &= ~SDSTAT_NOTINIT;
}
//SD_sendCommand(CRC_ON_OFF, OFF); //disable CRC; deafault - CRC disabled in SPI mode
//SD_sendCommand(SET_BLOCK_LEN, 512); //set block size to 512; default size is 512
// test to save power
SPI_HIGH_SPEED;
SD_Status |= SDSTAT_INIT;
return(0); //successful return
}