uint8_t SDcard_init()
{
uint8_t return_value[5];
uint8_t error_flag, index;
//Buffer ?
ncs = 1;
for(index = 0; index < 10; index++)
{
SPI_transfer(0xFF, return_value);
}
// Send CMD0 //
error_flag = trans_CMD0(return_value);
// Send CMD8 //
if(error_flag == NO_ERRORS)
{
error_flag = trans_CMD8(return_value);
}
// Send CMD58 //
if(error_flag == NO_ERRORS)
{
error_flag = trans_CMD58(return_value);
if(return_value[0] == 0x01)
{
error_flag = WRONG_RESPONCE;
}
}
// Send ACMD41 //
if(error_flag == NO_ERRORS)
{
error_flag = trans_ACMD41(return_value);
}
// Send CMD58 //
if(error_flag == NO_ERRORS)
{
error_flag = trans_CMD58(return_value);
if(return_value[1] & 0xC0) //bit 31 and 30 are set
{
//High Capacity
}
else if(return_value[1] & 0x80) // only bit 31 is set
{
//Standard Capacity
error_flag = WRONG_SDCARD;
}
else
{
error_flag = WRONG_RESPONCE;
}
}
if(error_flag != NO_ERRORS) // LED4 is the error light and this should also be redundent.
{
LED4 = 0;
}
ncs = 1; // should not be needed but just in case
return error_flag;
}
uint8_t SDcard_init()
{
uint8_t return_value[5];
uint8_t error_flag, index, dat;
AUXR = 0x0C;
//Buffer ?
ncs = 1;
for(index = 0; index < 10; index++)
{
SPI_transfer(0xFF, return_value);
}
// Send CMD0 //
error_flag = trans_CMD0(return_value);
for (index=0;index<5;index++)
{
dat=return_value[index];
printf("%2.2bX ",dat);
}
putchar(10);
putchar(13);
delay_ms(100);
// Send CMD8 //
if(error_flag == NO_ERRORS)
{
error_flag = trans_CMD8(return_value);
}
for (index=0;index<5;index++)
{
dat=return_value[index];
printf("%2.2bX ",dat);
}
putchar(10);
putchar(13);
delay_ms(100);
// Send CMD58 //
if(error_flag == NO_ERRORS)
{
error_flag = trans_CMD58(return_value);
if(return_value[0] != 0x01)
{
error_flag = WRONG_RESPONSE;
LED2 = 0;
}
}
for (index=0;index<5;index++)
{
dat=return_value[index];
printf("%2.2bX ",dat);
}
putchar(10);
putchar(13);
delay_ms(100);
// Send ACMD41 //
if(error_flag == NO_ERRORS)
{
error_flag = trans_ACMD41(return_value);
}
for (index=0;index<5;index++)
{
dat=return_value[index];
printf("%2.2bX ",dat);
}
putchar(10);
putchar(13);
delay_ms(100);
// Send CMD58 //
if(error_flag == NO_ERRORS)
{
error_flag = trans_CMD58(return_value);
if(return_value[1] & 0xC0) //bit 31 and 30 are set
{
//High Capacity
}
else if(return_value[1] & 0x80) // only bit 31 is set
{
//Standard Capacity
error_flag = WRONG_SDCARD;
}
else
{
error_flag = WRONG_RESPONSE;
}
}
for (index=0;index<5;index++)
{
dat=return_value[index];
printf("%2.2bX ",dat);
}
putchar(10);
putchar(13);
delay_ms(100);
if(error_flag != NO_ERRORS) // LED4 is the error light and this should also be redundent.
{
LED4 = 0;
}
ncs = 1; // should not be needed but just in case
return error_flag;
}