private BitStream HandleStandardCommand(SdCardCommand command, uint arg)
{
this.Log(LogLevel.Noisy, "Handling as a standard command: {0}", command);
switch (command)
{
case SdCardCommand.GoIdleState_CMD0:
GoToIdle();
return(spiMode
? GenerateR1Response()
: BitStream.Empty); // no response in SD mode
case SdCardCommand.SendCardIdentification_CMD2:
{
if (spiMode)
{
// this command is not supported in the SPI mode
break;
}
state = SDCardState.Identification;
return(CardIdentification);
}
case SdCardCommand.SendRelativeAddress_CMD3:
{
if (spiMode)
{
// this command is not supported in the SPI mode
break;
}
state = SDCardState.Standby;
var status = CardStatus.AsUInt32();
return(BitHelper.BitConcatenator.New()
.StackAbove(status, 13, 0)
.StackAbove(status, 1, 19)
.StackAbove(status, 2, 22)
.StackAbove(CardAddress, 16, 0)
.Bits);
}
case SdCardCommand.SelectDeselectCard_CMD7:
{
if (spiMode)
{
// this command is not supported in the SPI mode
break;
}
// this is a toggle command:
// Select is used to start a transfer;
// Deselct is used to abort the active transfer
switch (state)
{
case SDCardState.Standby:
state = SDCardState.Transfer;
break;
case SDCardState.Transfer:
case SDCardState.Programming:
state = SDCardState.Standby;
break;
}
return(CardStatus);
}
case SdCardCommand.SendInterfaceConditionCommand_CMD8:
return(spiMode
? GenerateR7Response()
: CardStatus);
case SdCardCommand.SendCardSpecificData_CMD9:
return(spiMode
? GenerateR1Response()
: CardSpecificData);
case SdCardCommand.StopTransmission_CMD12:
readContext.Reset();
writeContext.Reset();
switch (state)
{
case SDCardState.SendingData:
state = SDCardState.Transfer;
break;
case SDCardState.ReceivingData:
state = SDCardState.Programming;
break;
}
return(spiMode
? GenerateR1Response()
: CardStatus);
case SdCardCommand.SendStatus_CMD13:
return(spiMode
? GenerateR2Response()
: CardStatus);
case SdCardCommand.SetBlockLength_CMD16:
blockLengthInBytes = arg;
return(spiMode
? GenerateR1Response()
: CardStatus);
case SdCardCommand.ReadSingleBlock_CMD17:
readContext.BytesLeft = blockLengthInBytes;
readContext.Offset = highCapacityMode
? arg * blockLengthInBytes
: arg;
state = SDCardState.SendingData;
return(spiMode
? GenerateR1Response()
.Append(BlockBeginIndicator)
.Append(ReadData(blockLengthInBytes)) // the actual data
: CardStatus);
case SdCardCommand.ReadMultipleBlocks_CMD18:
if (spiMode)
{
this.Log(LogLevel.Warning, "Reading Multiple Blocks is currently not supported in the SPI mode by this model");
// TODO: implement it
break;
}
state = SDCardState.SendingData;
readContext.Offset = highCapacityMode
? arg * blockLengthInBytes
: arg;
return(CardStatus);
case SdCardCommand.WriteSingleBlock_CMD24:
if (spiMode)
{
this.Log(LogLevel.Warning, "Writing is currently not supported in the SPI mode by this model");
// TODO: implement it
break;
}
state = SDCardState.ReceivingData;
writeContext.BytesLeft = blockLengthInBytes;
writeContext.Offset = highCapacityMode
? arg * blockLengthInBytes
: arg;
return(CardStatus);
case SdCardCommand.AppCommand_CMD55:
treatNextCommandAsAppCommand = true;
return(spiMode
? GenerateR1Response()
: CardStatus);
case SdCardCommand.ReadOperationConditionRegister_CMD58:
return(spiMode
? GenerateR3Response()
: BitStream.Empty);
}
this.Log(LogLevel.Warning, "Unsupported command: {0}. Ignoring it", command);
return(spiMode
? GenerateR1Response(illegalCommand: true)
: BitStream.Empty);
}
private BitStream HandleStandardCommand(SdCardCommand command, uint arg)
{
this.Log(LogLevel.Debug, "Handling as a standard command: {0}", command);
switch (command)
{
case SdCardCommand.GoIdleState_CMD0:
Reset();
return(BitStream.Empty);
case SdCardCommand.SendCardIdentification_CMD2:
return(CardIdentification);
case SdCardCommand.SendRelativeAddress_CMD3:
{
var status = CardStatus.AsUInt32();
return(BitHelper.BitConcatenator.New()
.StackAbove(status, 13, 0)
.StackAbove(status, 1, 19)
.StackAbove(status, 2, 22)
.StackAbove(CardAddress, 16, 0)
.Bits);
}
case SdCardCommand.SelectDeselectCard_CMD7:
return(CardStatus);
case SdCardCommand.SendCardSpecificData_CMD9:
return(CardSpecificData);
case SdCardCommand.StopTransmission_CMD12:
readContext.Reset();
writeContext.Reset();
return(CardStatus);
case SdCardCommand.SendStatus_CMD13:
return(CardStatus);
case SdCardCommand.SetBlockLength_CMD16:
blockLengthInBytes = arg;
return(CardStatus);
case SdCardCommand.ReadSingleBlock_CMD17:
readContext.Offset = arg;
readContext.BytesLeft = blockLengthInBytes;
return(CardStatus);
case SdCardCommand.ReadMultipleBlocks_CMD18:
readContext.Offset = arg;
return(CardStatus);
case SdCardCommand.WriteSingleBlock_CMD24:
writeContext.Offset = arg;
writeContext.BytesLeft = blockLengthInBytes;
return(CardStatus);
case SdCardCommand.AppCommand_CMD55:
treatNextCommandAsAppCommand = true;
return(CardStatus);
default:
this.Log(LogLevel.Warning, "Unsupported command: {0}. Ignoring it", command);
return(BitStream.Empty);
}
}