// Reading the contents of the CSD and CID registers in SPI mode is a simple
// read-block transaction.
unsigned char mmcReadRegister (const char cmd_register, const unsigned char length, unsigned char *pBuffer)
{
unsigned char uc = 0;
unsigned char rvalue = MMC_TIMEOUT_ERROR;
if (mmcSetBlockLength (length) == MMC_SUCCESS)
{
CS_LOW ();
// CRC not used: 0xff as last byte
mmcSendCmd(cmd_register, 0x000000, 0xff);
// wait for response
// in the R1 format (0x00 is no errors)
if (mmcGetResponse() == 0x00)
{
if (mmcGetXXResponse(0xfe)== 0xfe)
for (uc = 0; uc < length; uc++)
pBuffer[uc] = spiSendByte(0xff); //mmc_buffer[uc] = spiSendByte(0xff);
// get CRC bytes (not really needed by us, but required by MMC)
spiSendByte(0xff);
spiSendByte(0xff);
rvalue = MMC_SUCCESS;
}
else
rvalue = MMC_RESPONSE_ERROR;
// CS = HIGH (off)
CS_HIGH ();
// Send 8 Clock pulses of delay.
spiSendByte(0xff);
}
CS_HIGH ();
return rvalue;
} // mmc_read_register
// Reading the contents of the CSD and CID registers in SPI mode is a simple
// read-block transaction.
char mmcReadRegister (const char cmd_register, const unsigned char length, unsigned char *pBuffer)
{
char uc;
char rvalue = MMC_TIMEOUT_ERROR;
if (mmcSetBlockLength (length) == MMC_SUCCESS)
{
MMC_CS_LOW ();
mmcSendCmd(cmd_register, 0x000000, 0xff); // CRC not used: 0xff as last byte
if (mmcGetResponse() == 0x00) { // Wait for R1 response (0x00 = OK)
if (mmcGetXXResponse(0xfe)== 0xfe)
for (uc = 0; uc < length; uc++)
pBuffer[uc] = spiSendByte(DUMMY_CHAR);
// get CRC bytes (not really needed by us, but required by MMC)
spiSendByte(DUMMY_CHAR);
spiSendByte(DUMMY_CHAR);
rvalue = MMC_SUCCESS;
}
else
rvalue = MMC_RESPONSE_ERROR;
MMC_CS_HIGH ();
spiSendByte(DUMMY_CHAR); // Send 8 Clock pulses of delay.
}
MMC_CS_HIGH ();
return rvalue;
} // mmc_read_register
//char mmcWriteBlock (const unsigned long address)
char mmcWriteBlock (const unsigned long address, const unsigned long count, unsigned char *pBuffer)
{
char rvalue = MMC_RESPONSE_ERROR; // MMC_SUCCESS;
if (mmcSetBlockLength (count) == MMC_SUCCESS) { // Set the block length to read
MMC_CS_LOW ();
mmcSendCmd (MMC_WRITE_BLOCK,address, 0xFF); // Send write command
// Check if the MMC acknowledged the write block command
// it will do this by sending an affirmative response
// in the R1 format (0x00 is no errors)
if (mmcGetXXResponse(MMC_R1_RESPONSE) == MMC_R1_RESPONSE) {
spiSendByte(DUMMY_CHAR);
spiSendByte(0xfe); // Send the data token to signify the start of the data
spiSendFrame(pBuffer, count); // Clock the actual data transfer and transmit the bytes
// Put CRC bytes (not really needed by us, but required by MMC)
spiSendByte(DUMMY_CHAR);
spiSendByte(DUMMY_CHAR);
// Read the data response xxx0<status>1
// Status = 010: Data accepted
// Status 101: Data rejected due to a CRC error
// Status 110: Data rejected due to a write error.
rvalue = mmcCheckBusy();
if(rvalue==MMC_SUCCESS) {
// check status after write for any possible errors during write (see sandisk.pdf, p.63)
MMC_CS_HIGH();
spiSendByte(DUMMY_CHAR);
MMC_CS_LOW();
mmcSendCmd(MMC_SEND_STATUS, 0, 0xFF);
if (mmcGetR2Response() != 0x0000) {
rvalue = MMC_WRITE_ERROR;
}
}
}
else { // The MMC never acknowledge the write command
rvalue = MMC_RESPONSE_ERROR; // 2
}
}
else {
rvalue = MMC_BLOCK_SET_ERROR; // 1
}
MMC_CS_HIGH();
spiSendByte(DUMMY_CHAR); // Send 8 Clock pulses of delay.
return rvalue;
} // mmc_write_block
char mmcMountBlock(unsigned long address)
{
char rvalue = MMC_RESPONSE_ERROR;
// Set the block length to read
if (mmcSetBlockLength (512) == MMC_SUCCESS) // block length could be set
{
// SS = LOW (on)
CS_LOW ();
// send read command MMC_READ_SINGLE_BLOCK=CMD17
mmcSendCmd (MMC_READ_SINGLE_BLOCK, address, 0xFF);
// Send 8 Clock pulses of delay, check if the MMC acknowledged the read block command
// it will do this by sending an affirmative response
// in the R1 format (0x00 is no errors)
if (mmcGetResponse() == 0x00)
{
// now look for the data token to signify the start of
// the data
if (mmcGetXXResponse(MMC_START_DATA_BLOCK_TOKEN) == MMC_START_DATA_BLOCK_TOKEN)
{
//success, data ready to read
rvalue = MMC_SUCCESS;
}
else
{
// the data token was never received
rvalue = MMC_DATA_TOKEN_ERROR; // 3
CS_HIGH ();
spiSendByte(0xff);
}
}
else
{
// the MMC never acknowledge the read command
rvalue = MMC_RESPONSE_ERROR; // 2
CS_HIGH ();
spiSendByte(0xff);
}
}
else
{
rvalue = MMC_BLOCK_SET_ERROR; // 1
CS_HIGH ();
spiSendByte(0xff);
}
return rvalue;
}// mmc_read_block
// read a size Byte big block beginning at the address.
char mmcReadBlock(const unsigned long address, const unsigned long count, unsigned char *pBuffer) {
char rvalue = MMC_RESPONSE_ERROR;
// Set the block length to read
if (mmcSetBlockLength (count) == MMC_SUCCESS) { // Attempt to set block length
MMC_CS_LOW ();
// send read command MMC_READ_SINGLE_BLOCK=CMD17
mmcSendCmd (MMC_READ_SINGLE_BLOCK,address, 0xFF);
// Send 8 Clock pulses of delay, check if the MMC acknowledged the read block command
// it will do this by sending an affirmative response
// in the R1 format (0x00 is no errors)
if (mmcGetResponse() == 0x00) {
// Look for the data token to signify the start of data
if (mmcGetXXResponse(MMC_START_DATA_BLOCK_TOKEN) == MMC_START_DATA_BLOCK_TOKEN) {
// Clock the actual data transfer and receive the bytes; spi_read automatically finds the Data Block
spiReadFrame(pBuffer, count);
// Get CRC bytes (not really needed by us, but required by MMC)
spiSendByte(DUMMY_CHAR);
spiSendByte(DUMMY_CHAR);
rvalue = MMC_SUCCESS;
}
else { // The data token was never received
rvalue = MMC_DATA_TOKEN_ERROR; // 3
}
}
else { // The MMC never acknowledge the read command
rvalue = MMC_RESPONSE_ERROR; // 2
}
}
else { // The block length was not set correctly
rvalue = MMC_BLOCK_SET_ERROR; // 1
}
MMC_CS_HIGH ();
spiSendByte(DUMMY_CHAR);
return rvalue;
}// mmc_read_block
//---------------------------------------------------------------------
//char mmcWriteBlock (const unsigned long address)
unsigned char mmcWriteBlock (const unsigned long address, const unsigned long count, unsigned char *pBuffer)
{
unsigned long i = 0;
unsigned char rvalue = MMC_RESPONSE_ERROR; // MMC_SUCCESS;
// char c = 0x00;
// Set the block length to read
if (mmcSetBlockLength (count) == MMC_SUCCESS) // block length could be set
{
// SS = LOW (on)
CS_LOW ();
// send write command
mmcSendCmd (MMC_WRITE_BLOCK,address, 0xFF);
// check if the MMC acknowledged the write block command
// it will do this by sending an affirmative response
// in the R1 format (0x00 is no errors)
if (mmcGetXXResponse(MMC_R1_RESPONSE) == MMC_R1_RESPONSE)
{
spiSendByte(0xff);
// send the data token to signify the start of the data
spiSendByte(0xfe);
// clock the actual data transfer and transmitt the bytes
#ifndef withDMA
for (i = 0; i < count; i++)
spiSendByte(pBuffer[i]);
#else
/* Get the block */
/* DMA trigger is UART send */
DMACTL0 &= ~(DMA0TSEL_15);
DMACTL0 |= (DMA0TSEL_9);
/* Source DMA address: the data buffer. */
DMA0SA = (unsigned short)pBuffer;
/* Destination DMA address: the UART send register. */
DMA0DA = U1TXBUF_;
/* The size of the block to be transferred */
DMA0SZ = count;
/* Configure the DMA transfer*/
DMA0CTL =
DMAREQ | /* start transfer */
DMADT_0 | /* Single transfer mode */
DMASBDB | /* Byte mode */
DMAEN | /* Enable DMA */
DMASRCINCR1 | DMASRCINCR0; /* Increment the source address */
#endif
// put CRC bytes (not really needed by us, but required by MMC)
spiSendByte(0xff);
spiSendByte(0xff);
// read the data response xxx0<status>1 : status 010: Data accected, status 101: Data
// rejected due to a crc error, status 110: Data rejected due to a Write error.
mmcCheckBusy();
rvalue = MMC_SUCCESS;
}
else
{
// the MMC never acknowledge the write command
rvalue = MMC_RESPONSE_ERROR; // 2
}
}
else
{
rvalue = MMC_BLOCK_SET_ERROR; // 1
}
// give the MMC the required clocks to finish up what ever it needs to do
// for (i = 0; i < 9; ++i)
// spiSendByte(0xff);
CS_HIGH ();
// Send 8 Clock pulses of delay.
spiSendByte(0xff);
return rvalue;
} // mmc_write_block
unsigned char mmcReadBlock(const unsigned long address, const unsigned long count, unsigned char *pBuffer)
{
unsigned long i = 0;
unsigned char rvalue = MMC_RESPONSE_ERROR;
// Set the block length to read
if (mmcSetBlockLength (count) == MMC_SUCCESS) // block length could be set
{
// SS = LOW (on)
CS_LOW ();
// send read command MMC_READ_SINGLE_BLOCK=CMD17
mmcSendCmd (MMC_READ_SINGLE_BLOCK,address, 0xFF);
// Send 8 Clock pulses of delay, check if the MMC acknowledged the read block command
// it will do this by sending an affirmative response
// in the R1 format (0x00 is no errors)
if (mmcGetResponse() == 0x00)
{
// now look for the data token to signify the start of
// the data
mmc_error = mmcGetXXResponse(MMC_START_DATA_BLOCK_TOKEN);
if (mmc_error == MMC_START_DATA_BLOCK_TOKEN)
// if (mmcGetXXResponse(MMC_START_DATA_BLOCK_TOKEN) == MMC_START_DATA_BLOCK_TOKEN)
{
#ifndef withDMA
// clock the actual data transfer and receive the bytes; spi_read automatically finds the Data Block
for (i = 0; i < count; i++)
pBuffer[i] = spiSendByte(0xff); // is executed with card inserted
#else
U1IFG &= ~(URXIFG1 + URXIFG1); /* clear flags */
/* Get the block */
/* DMA trigger is UART1 receive for both DMA0 and DMA1 */
DMACTL0 &= ~(DMA0TSEL_15 | DMA1TSEL_15);
DMACTL0 |= (DMA0TSEL_9 | DMA1TSEL_9);
/* Source DMA address: receive register. */
DMA0SA = U1RXBUF_;
/* Destination DMA address: the user data buffer. */
DMA0DA = (unsigned short)pBuffer;
/* The size of the block to be transferred */
DMA0SZ = count;
/* Configure the DMA transfer*/
DMA0CTL =
DMAIE | /* Enable interrupt */
DMADT_0 | /* Single transfer mode */
DMASBDB | /* Byte mode */
DMAEN | /* Enable DMA */
DMADSTINCR1 | DMADSTINCR0; /* Increment the destination address */
/* We depend on the DMA priorities here. Both triggers occur at
the same time, since the source is identical. DMA0 is handled
first, and retrieves the byte. DMA1 is triggered next, and
sends the next byte. */
/* Source DMA address: constant 0xFF (don't increment)*/
DMA1SA = U1TXBUF_;
/* Destination DMA address: the transmit buffer. */
DMA1DA = U1TXBUF_;
/* Increment the destination address */
/* The size of the block to be transferred */
DMA1SZ = count-1;
/* Configure the DMA transfer*/
DMA1CTL =
DMADT_0 | /* Single transfer mode */
DMASBDB | /* Byte mode */
DMAEN; /* Enable DMA */
/* Kick off the transfer by sending the first byte */
U1TXBUF = 0xFF;
// while (DMA0CTL & DMAEN) _NOP(); //LPM0; // wait till done
// while (DMA0CTL & DMAEN) _EINT(); LPM0; // wait till done
_EINT(); LPM0; // wait till done
#endif
// get CRC bytes (not really needed by us, but required by MMC)
spiSendByte(0xff);
spiSendByte(0xff);
rvalue = MMC_SUCCESS;
}
else
{
// the data token was never received
rvalue = MMC_DATA_TOKEN_ERROR; // 3
}
}
else
{
// the MMC never acknowledge the read command
rvalue = MMC_RESPONSE_ERROR; // 2
}
}
else
{
rvalue = MMC_BLOCK_SET_ERROR; // 1
}
CS_HIGH ();
spiSendByte(0xff);
return rvalue;
}// mmc_read_block
