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| /*****************************************************************************
Function:
MEDIA_INFORMATION * MDD_SDSPI_MediaInitialize (void)
Summary:
Initializes the SD card.
Conditions:
The MDD_MediaInitialize function pointer must be pointing to this function.
Input:
None.
Return Values:
The function returns a pointer to the MEDIA_INFORMATION structure. The
errorCode member may contain the following values:
* MEDIA_NO_ERROR - The media initialized successfully
* MEDIA_CANNOT_INITIALIZE - Cannot initialize the media.
Side Effects:
None.
Description:
This function will send initialization commands to and SD card.
Remarks:
None.
***************************************************************************************/
MEDIA_INFORMATION * MDD_SDSPI_MediaInitialize(void)
{
WORD timeout;
MMC_RESPONSE response;
#if defined __C30__ || defined __C32__
WORD spiconvalue = 0x0003;
#endif
mediaInformation.errorCode = MEDIA_NO_ERROR;
mediaInformation.validityFlags.value = 0;
SD_CS = 1; //Initialize Chip Select line
//Media powers up in the open-drain mode and cannot handle a clock faster
//than 400kHz. Initialize SPI port to slower than 400kHz
#if defined __C30__ || defined __C32__
#ifdef __PIC32MX__
OpenSPI(SPI_START_CFG_1, SPI_START_CFG_2);
SPIBRG = SPICalutateBRG(GetPeripheralClock(), 400000);
#else
// Calculate the prescaler needed for the clock
timeout = GetSystemClock() / 400000;
// if timeout is less than 400k and greater than 100k use a 1:1 prescaler
if (timeout == 0)
{
OpenSPIM (MASTER_ENABLE_ON | PRI_PRESCAL_1_1 | SEC_PRESCAL_1_1);
}
else
{
while (timeout != 0)
{
if (timeout > 8)
{
spiconvalue--;
// round up
if ((timeout % 4) != 0)
timeout += 4;
timeout /= 4;
}
else
{
break;
}
}
timeout--;
OpenSPIM (MASTER_ENABLE_ON | spiconvalue | ((~(timeout << 2)) & 0x1C));
}
#endif
// let the card power on and initialize
Delayms(1);
//Media requires 80 clock cycles to startup [8 clocks/BYTE * 10 us]
for(timeout=0; timeout<10; timeout++)
mSend8ClkCycles();
SD_CS = 0;
Delayms(1);
// Send CMD0 to reset the media
response = SendMMCCmd(GO_IDLE_STATE,0x0);
if((response.r1._byte == MMC_BAD_RESPONSE) || ((response.r1._byte & 0xF7) != 0x01))
{
SD_CS = 1; // deselect the devices
mediaInformation.errorCode = MEDIA_CANNOT_INITIALIZE;
return &mediaInformation;
}
response = SendMMCCmd(SEND_IF_COND, 0x1AA);
if (((response.r7.bytewise._returnVal & 0xFFF) == 0x1AA) && (!response.r7.bitwise.bits.ILLEGAL_CMD))
{
timeout = 0xFFF;
do
{
response = SendMMCCmd(SEND_OP_COND, 0x40000000);
timeout--;
}while(response.r1._byte != 0x00 && timeout != 0);
response = SendMMCCmd(READ_OCR, 0x0);
if (((response.r7.bytewise._returnVal & 0xC0000000) == 0x80000000) && (response.r7.bytewise._byte == 0))
{
gSDMode = SD_MODE_NORMAL;
}
if (((response.r7.bytewise._returnVal & 0xC0000000) == 0xC0000000) && (response.r7.bytewise._byte == 0))
{
gSDMode = SD_MODE_;
}
}
else
{
gSDMode = SD_MODE_NORMAL;
// According to spec cmd1 must be repeated until the card is fully initialized
timeout = 0xFFF;
do
{
response = SendMMCCmd(SEND_OP_COND,0x0);
timeout--;
}while(response.r1._byte != 0x00 && timeout != 0);
}
// see if it failed
if(timeout == 0)
{
mediaInformation.errorCode = MEDIA_CANNOT_INITIALIZE;
SD_CS = 1; // deselect the devices
}
else
{
#else
// let the card power on and initialize
Delayms(1);
#if (GetSystemClock() < 25600000)
#if (GetSystemClock() < 1600000)
OpenSPIM (SYNC_MODE_FAST);
#elif (GetSystemClock() < 6400000)
OpenSPIM (SYNC_MODE_MED);
#else
OpenSPIM (SYNC_MODE_SLOW);
#endif
// let the card power on and initialize
Delayms(1);
//Media requires 80 clock cycles to startup [8 clocks/BYTE * 10 us]
for(timeout=0; timeout<10; timeout++)
mSend8ClkCycles();
SD_CS = 0;
Delayms(1);
// Send CMD0 to reset the media
response = SendMMCCmd(GO_IDLE_STATE,0x0);
if((response.r1._byte == MMC_BAD_RESPONSE) || ((response.r1._byte & 0xF7) != 0x01))
{
mediaInformation.errorCode = MEDIA_CANNOT_INITIALIZE;
SD_CS = 1; // deselect the devices
return &mediaInformation;
}
response = SendMMCCmd(SEND_IF_COND, 0x1AA);
if (((response.r7.bytewise._returnVal & 0xFFF) == 0x1AA) && (!response.r7.bitwise.bits.ILLEGAL_CMD))
{
timeout = 0xFFF;
do
{
response = SendMMCCmd(SEND_OP_COND, 0x40000000);
timeout--;
}while(response.r1._byte != 0x00 && timeout != 0);
response = SendMMCCmd(READ_OCR, 0x0);
if (((response.r7.bytewise._returnVal & 0xC0000000) == 0x80000000) && (response.r7.bytewise._byte == 0))
{
gSDMode = SD_MODE_NORMAL;
}
if (((response.r7.bytewise._returnVal & 0xC0000000) == 0xC0000000) && (response.r7.bytewise._byte == 0))
{
gSDMode = SD_MODE_HC;
}
}
else
{
gSDMode = SD_MODE_NORMAL;
// According to spec cmd1 must be repeated until the card is fully initialized
timeout = 0xFFF;
do
{
response = SendMMCCmd(SEND_OP_COND,0x0);
timeout--;
}while(response.r1._byte != 0x00 && timeout != 0);
}
#else
// Make sure the SPI module doesn't control the bus
SPICON1 = 0x00;
//Media requires 80 clock cycles to startup [8 clocks/BYTE * 10 us]
for(timeout=0; timeout<10; timeout++)
WriteSPIManual(0xFF);
SD_CS = 0;
Delayms(1);
// Send CMD0 to reset the media
response = SendMMCCmdManual (GO_IDLE_STATE, 0x0);
if ((response.r1._byte == MMC_BAD_RESPONSE) || ((response.r1._byte & 0xF7) != 0x01))
{
SD_CS = 1; // deselect the devices
mediaInformation.errorCode = MEDIA_CANNOT_INITIALIZE;
return &mediaInformation;
}
response = SendMMCCmdManual(SEND_IF_COND, 0x1AA);
if (((response.r7.bytewise._returnVal & 0xFFF) == 0x1AA) && (!response.r7.bitwise.bits.ILLEGAL_CMD))
{
timeout = 0xFFF;
do
{
response = SendMMCCmdManual(SEND_OP_COND, 0x40000000);
timeout--;
}while(response.r1._byte != 0x00 && timeout != 0);
response = SendMMCCmdManual(READ_OCR, 0x0);
if (((response.r7.bytewise._returnVal & 0xC0000000) == 0x80000000) && (response.r7.bytewise._byte == 0))
{
gSDMode = SD_MODE_NORMAL;
}
if (((response.r7.bytewise._returnVal & 0xC0000000) == 0xC0000000) && (response.r7.bytewise._byte == 0))
{
gSDMode = SD_MODE_HC;
}
}
else
{
gSDMode = SD_MODE_NORMAL;
// According to the spec cmd1 must be repeated until the card is fully initialized
timeout = 0xFFF;
do
{
response = SendMMCCmdManual (SEND_OP_COND, 0x0);
timeout--;
}while(response.r1._byte != 0x00 && timeout != 0);
}
#endif
// see if it failed
if (timeout == 0)
{
mediaInformation.errorCode = MEDIA_CANNOT_INITIALIZE;
SD_CS = 1; // deselect the devices
}
else
{
#endif
Delayms (2);
#ifdef __PIC32MX__
#if (GetSystemClock() <= 20000000)
SPIBRG = SPICalutateBRG(GetPeripheralClock(), 10000);
#else
SPIBRG = SPICalutateBRG(GetPeripheralClock(), SPI_FREQUENCY);
#endif
#else
OpenSPIM(SYNC_MODE_FAST);
#endif
// Turn off CRC7 if we can, might be an invalid cmd on some cards (CMD59)
response = SendMMCCmd(CRC_ON_OFF,0x0);
// Now set the block length to media sector size. It should be already
response = SendMMCCmd(SET_BLOCKLEN,MEDIA_SECTOR_SIZE);
for(timeout = 0xFF; timeout > 0 && MDD_SDSPI_SectorRead(0x0,NULL) != TRUE; timeout--)
{;}
// see if we had an issue
if(timeout == 0)
{
mediaInformation.errorCode = MEDIA_CANNOT_INITIALIZE;
SD_CS = 1; // deselect the devices
}
}
return &mediaInformation;
}
}//end MediaInitialize |
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