int mmc_readsector(uint32_t lba, uint8_t *buffer)
{
uint16_t i,retval;
printf("\nreadsector\n");
// send read command and logical sector address
mmc_send_command(17,(lba>>7) & 0xffff, (lba<<9) & 0xffff);
//mmc_send_command(17,(lba>>16) & 0xffff, (lba) & 0xffff); //wjr
retval=mmc_get();
printf("\ngot rc %d\n",retval);
if (mmc_datatoken() != 0xfe) // if no valid token
{
mmc_clock_and_release(); // cleanup and
return -1; // return error code
}
spiReceiveN(buffer,512);
// for (i=0;i<512;i++) // read sector data
// *buffer++ = spixfer(0xff);
(void)spixfer(0xff); // ignore dummy checksum
(void)spixfer(0xff); // ignore dummy checksum
mmc_clock_and_release(); // cleanup
return 0; // return success
}
uint8_t mmc_init(void)
{
unsigned int i,retval;
digitalWrite(SDSS,HIGH) ;
for(i=0;i<10;i++) // send 80 clocks while card power stabilizes
(void)spixfer(0xff);
mmc_send_command(0,0,0); // send CMD0 - reset card
retval=mmc_get();
if (retval != 1) // if no valid response code
{
printf("\nmmc init cmd 0 failed with code %d (should have been 1)\n");
mmc_clock_and_release();
return 1; // card cannot be detected
}
//
// send CMD1 until we get a 0 back, indicating card is done initializing
//
i = 0xff; // max timeout
while ((spixfer(0xff) != 0) && (--i)) // wait for it
{
mmc_send_command(1,0,0); // send CMD1 - activate card init
}
mmc_clock_and_release(); // clean up
if (i == 0){ // if we timed out above
printf("\nmmc cmd 1 failed\n");
return 2; // return failure code
}
return 0;
}
/** Init MMC/SD card.
Initialize I/O ports for the MMC/SD interface and
send init commands to the MMC/SD card
\return 0 on success, other values on error
*/
uint8_t mmc_init(void)
{
//Run configure_spi() to setup the SPI port before initializing MMC.
int i;
for(i=0;i<10;i++) // send 8 clocks while card power stabilizes
spi_byte(0xff);
mmc_send_command(0,0,0); // send CMD0 - reset card
if (mmc_get() != 1) // if no valid response code
{
mmc_clock_and_release();
return 1; // card cannot be detected
}
//
// send CMD1 until we get a 0 back, indicating card is done initializing
//
i = 0xffff; // max timeout
while ((spi_byte(0xff) != 0) && (--i)) // wait for it
{
mmc_send_command(1,0,0); // send CMD1 - activate card init
}
mmc_clock_and_release(); // clean up
if (i == 0) // if we timed out above
return 2; // return failure code
return 0;
}
//Write MMC/SD sector
int mmc_writesector(uint32_t lba, uint8_t *buffer)
{
uint16_t i;
// send write command and logical sector address
mmc_send_command(24,(lba>>7) & 0xffff, (lba<<9) & 0xffff);
spi_byte(0xfe); //Send data token
for (i=0;i<512;i++) //Send sector data
spi_byte(*buffer++);
spi_byte(0xff); //Send dummy 16-bit checksum
spi_byte(0xff);
if ((mmc_get() & 0x0f) != 0x05) { //Receive response token
mmc_clock_and_release();
return -1; //Write error
}
while (spi_byte(0xff) == 0x00) {
//Wait for the card to finish writing, this can take
//a very long time, i.e. several hundred milliseconds
}
mmc_clock_and_release(); //Cleanup
return 0; //Return success
}
void mmc_playerStop(){
if(mmc_player_status==MMC_PLAYER_STARTED){
mmc_send_command(12,0,0); //stop transfers
mmc_clock_and_release();
}
mmc_player_status = MMC_PLAYER_STOPPED;
}
/** Read MMC/SD sector.
Read a single 512 byte sector from the MMC/SD card
\param lba Logical sectornumber to read
\param buffer Pointer to buffer for received data
\return 0 on success, -1 on error
*/
int mmc_readsector(uint32_t lba, uint8_t *buffer)
{
uint16_t i;
// send read command and logical sector address
mmc_send_command(17,(lba>>7) & 0xffff, (lba<<9) & 0xffff);
if (mmc_datatoken() != 0xfe) // if no valid token
{
mmc_clock_and_release(); // cleanup and
return -1; // return error code
}
for (i=0;i<512;i++) // read sector data
*buffer++ = spi_byte(0xff);
spi_byte(0xff); // ignore dummy checksum
spi_byte(0xff); // ignore dummy checksum
mmc_clock_and_release(); // cleanup
return 0; // return success
}
//starts playing wav file pointed at by lba
void mmc_playerStart(mmc_File file){
if(mmc_player_status==MMC_PLAYER_STARTED)
{
mmc_player_status = MMC_PLAYER_STOPPED;
mmc_send_command(12,0,0); //stop current transfer
mmc_clock_and_release();
}
// send the multiple block read command and logical sector address
mmc_player_sector=file.firstSector;
mmc_send_command(18,(mmc_player_sector>>7) & 0xffff, (mmc_player_sector<<9) & 0xffff);
playerRead=0;
sectorRead=0;
samplesToPlay.value=-1;
mmc_player_status = MMC_PLAYER_STARTED;
}
