src/memory/SdCard.cc at main · doomsdayone/openmsx

◆ main openmsx / src / memory / SdCard.cc

10.0 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw

#include "SdCard.hh"

#include "DeviceConfig.hh"
#include "HD.hh"
#include "MSXException.hh"
#include "serialize.hh"
#include "serialize_stl.hh"

#include "endian.hh"
#include "narrow.hh"
#include "unreachable.hh"

#include <memory>

// TODO:
// - replace transferDelayCounter with 0xFF's in responseQueue?
// - remove duplication between WRITE and MULTI_WRITE (is it worth it?)
// - see TODOs in the code below

namespace openmsx {

// data response tokens
static constexpr uint8_t DRT_ACCEPTED    = 0x05;
static constexpr uint8_t DRT_WRITE_ERROR = 0x0D;

// start block tokens and stop tran token
static constexpr uint8_t START_BLOCK_TOKEN     = 0xFE;
static constexpr uint8_t START_BLOCK_TOKEN_MBW = 0xFC;
static constexpr uint8_t STOP_TRAN_TOKEN       = 0xFD;

// data error token
static constexpr uint8_t DATA_ERROR_TOKEN_ERROR        = 0x01;
static constexpr uint8_t DATA_ERROR_TOKEN_OUT_OF_RANGE = 0x08;

// responses
static constexpr uint8_t R1_BUSY            = 0x00;
static constexpr uint8_t R1_IDLE            = 0x01; // TODO: why is lots of code checking for this instead of R1_BUSY?
static constexpr uint8_t R1_ILLEGAL_COMMAND = 0x04;
static constexpr uint8_t R1_PARAMETER_ERROR = 0x80;

SdCard::SdCard(const DeviceConfig& config)
	: hd(config.getXML() ? std::make_unique<HD>(config) : nullptr)
{
}

SdCard::~SdCard() = default;

// helper methods for 'transfer' to avoid duplication
uint8_t SdCard::readCurrentByteFromCurrentSector()
{
	uint8_t result = [&] {
		if (currentByteInSector == -1) {
			try {
				hd->readSector(currentSector, sectorBuf);
				return START_BLOCK_TOKEN;
			} catch (MSXException&) {
				return DATA_ERROR_TOKEN_ERROR;
			}
		} else {
			// output next byte from stream
			return sectorBuf.raw[currentByteInSector];
		}
	}();
	currentByteInSector++;
	if (currentByteInSector == sizeof(sectorBuf)) {
		responseQueue.push_back({uint8_t(0x00), uint8_t(0x00)}); // 2 CRC's (dummy)
	}
	return result;
}

uint8_t SdCard::transfer(uint8_t value, bool cs)
{
	if (!hd) return 0xFF; // no card inserted

	if (cs) {
		// /CS is true: not for this chip
		return 0xFF;
	}

	// process output
	using enum Mode;
	uint8_t retval = 0xFF;
	if (transferDelayCounter > 0) {
		--transferDelayCounter;
	} else {
		if (responseQueue.empty()) {
			switch (mode) {
			case READ:
				retval = readCurrentByteFromCurrentSector();
				if (currentByteInSector == sizeof(sectorBuf)) {
					mode = COMMAND;
				}
				break;
			case MULTI_READ:
				// when there's an error, you probably have to send a CMD12
				// to go back to the COMMAND mode. This is not
				// clear in the spec (it's wrongly suggested
				// for the MULTI_WRITE mode!)
				if (currentSector >= hd->getNbSectors()) {
					// data out of range, send data error token
					retval = DATA_ERROR_TOKEN_OUT_OF_RANGE;
				} else {
					retval = readCurrentByteFromCurrentSector();
					if (currentByteInSector == sizeof(sectorBuf)) {
						currentSector++;
						currentByteInSector = -1;
					}
				}
				break;
			case WRITE:
			case MULTI_WRITE:
				// apparently nothing is returned while writing
			case COMMAND:
			default:
			break;
			}
		} else {
			retval = responseQueue.pop_front();
		}
	}

	// process input
	switch (mode) {
	case WRITE:
		// first check for data token
		if (currentByteInSector == -1) {
			if (value == START_BLOCK_TOKEN) {
				currentByteInSector++;
			}
			break;
		}
		if (currentByteInSector < int(sizeof(sectorBuf))) {
			sectorBuf.raw[currentByteInSector] = value;
		}
		currentByteInSector++;
		if (currentByteInSector == (sizeof(sectorBuf) + 2)) {
			uint8_t response = DRT_ACCEPTED;
			// copy buffer to SD card
			try {
				hd->writeSector(currentSector, sectorBuf);
			} catch (MSXException&) {
				response = DRT_WRITE_ERROR;
			}
			mode = COMMAND;
			transferDelayCounter = 1;
			responseQueue.push_back(response);
		}
		break;
	case MULTI_WRITE:
		// first check for stop or start token
		if (currentByteInSector == -1) {
			if (value == STOP_TRAN_TOKEN) {
				mode = COMMAND;
			}
			if (value == START_BLOCK_TOKEN_MBW) {
				currentByteInSector++;
			}
			break;
		}
		if (currentByteInSector < int(sizeof(sectorBuf))) {
			sectorBuf.raw[currentByteInSector] = value;
		}
		currentByteInSector++;
		if (currentByteInSector == (sizeof(sectorBuf) + 2)) {
			// check if still in valid range
			uint8_t response = DRT_ACCEPTED;
			if (currentSector >= hd->getNbSectors()) {
				response = DRT_WRITE_ERROR;
				// note: mode is not changed, should be done by
				// the host with CMD12 (STOP_TRANSMISSION) -
				// however, this makes no sense, CMD12 is only
				// for Multiple Block Read!? Wrong in the spec?
			} else {
				// copy buffer to SD card
				try {
					hd->writeSector(currentSector, sectorBuf);
					currentByteInSector = -1;
					currentSector++;
				} catch (MSXException&) {
					response = DRT_WRITE_ERROR;
					// note: mode is not changed, should be
					// done by the host with CMD12
					// (STOP_TRANSMISSION) - however, this
					// makes no sense, CMD12 is only for
					// Multiple Block Read!? Wrong in the
					// spec?
				}
			}
			transferDelayCounter = 1;
			responseQueue.push_back(response);
		}
		break;
	case COMMAND:
	default:
		if ((cmdIdx == 0 && (value >> 6) == 1) // command start
				|| cmdIdx > 0) { // command in progress
			cmdBuf[cmdIdx] = value;
			++cmdIdx;
			if (cmdIdx == 6) {
				executeCommand();
				cmdIdx = 0;
			}
		}
		break;
	}

	return retval;
}

void SdCard::executeCommand()
{
	// it takes 2 transfers (2x8 cycles) before a reply
	// can be given to a command
	using enum Mode;
	transferDelayCounter = 2;
	uint8_t command = cmdBuf[0] & 0x3F;
	switch (command) {
	case 0:  // GO_IDLE_STATE
		responseQueue.clear();
		mode = COMMAND;
		responseQueue.push_back(R1_IDLE);
		break;
	case 8:  // SEND_IF_COND
		// conditions are always OK
		responseQueue.push_back({
			R1_IDLE,    // R1 (OK) SDHC (checked by MegaSD and FUZIX)
			uint8_t(0x02), // command version
			uint8_t(0x00), // reserved
			uint8_t(0x01), // voltage accepted
			cmdBuf[4]});// check pattern
		break;
	case 9:{ // SEND_CSD
		responseQueue.push_back({
			R1_BUSY, // OK (ignored on MegaSD code, used in FUZIX)
		// now follows a CSD version 2.0 (for SDHC)
			START_BLOCK_TOKEN, // data token
			uint8_t(0x40),        // CSD_STRUCTURE [127:120]
			uint8_t(0x0E),        // (TAAC)
			uint8_t(0x00),        // (NSAC)
			uint8_t(0x32),        // (TRAN_SPEED)
			uint8_t(0x00),        // CCC
			uint8_t(0x00),        // CCC / (READ_BL_LEN)
			uint8_t(0x00)});      // (RBP)/(WBM)/(RBM)/ DSR_IMP
		// SD_CARD_SIZE = (C_SIZE + 1) * 512kByte
		auto c_size = narrow<uint32_t>((hd->getNbSectors() * sizeof(sectorBuf)) / size_t(512 * 1024) - 1);
		responseQueue.push_back({
			uint8_t((c_size >> 16) & 0x3F), // C_SIZE 1
			uint8_t((c_size >>  8) & 0xFF), // C_SIZE 2
			uint8_t((c_size >>  0) & 0xFF), // C_SIZE 3
			uint8_t(0x00),   // res/(EBE)/(SS1)
			uint8_t(0x00),   // (SS2)/(WGS)
			uint8_t(0x00),   // (WGE)/res/(RF)/(WBL1)
			uint8_t(0x00),   // (WBL2)/(WBP)/res
			uint8_t(0x00),   // (FFG)/COPY/PWP/TWP/(FF)/res
			uint8_t(0x01)}); // CRC / 1
		break;}
	case 10: // SEND_CID
		responseQueue.push_back({
			R1_BUSY, // OK (ignored on MegaSD, unused in FUZIX so far)
			START_BLOCK_TOKEN, // data token
			uint8_t(0xAA),   // CID01 // manuf ID
			uint8_t('o' ),   // CID02 // OEM/App ID 1
			uint8_t('p' ),   // CID03 // OEM/App ID 2
			uint8_t('e' ),   // CID04 // Prod name 1
			uint8_t('n' ),   // CID05 // Prod name 2
			uint8_t('M' ),   // CID06 // Prod name 3
			uint8_t('S' ),   // CID07 // Prod name 4
			uint8_t('X' ),   // CID08 // Prod name 5
			uint8_t(0x01),   // CID09 // Prod Revision
			uint8_t(0x12),   // CID10 // Prod Serial 1
			uint8_t(0x34),   // CID11 // Prod Serial 2
			uint8_t(0x56),   // CID12 // Prod Serial 3
			uint8_t(0x78),   // CID13 // Prod Serial 4
			uint8_t(0x00),   // CID14 // reserved / Y1
			uint8_t(0xE6),   // CID15 // Y2 / M
			uint8_t(0x01)}); // CID16 // CRC / not used
		break;
	case 12: // STOP TRANSMISSION
		responseQueue.push_back(R1_IDLE); // R1 (OK)
		mode = COMMAND;
		break;
	case 16: // SET_BLOCK_LEN
		responseQueue.push_back(R1_IDLE); // OK, we don't really care
		break;
	case 17: // READ_SINGLE_BLOCK
	case 18: // READ_MULTIPLE_BLOCK
	case 24: // WRITE_BLOCK
	case 25: // WRITE_MULTIPLE_BLOCK
		// SDHC so the address is the sector
		currentSector = Endian::readB32(&cmdBuf[1]);
		if (currentSector >= hd->getNbSectors()) {
			responseQueue.push_back(R1_PARAMETER_ERROR);
		} else {
			responseQueue.push_back(R1_BUSY);
			switch (command) {
				case 17: mode = READ; break;
				case 18: mode = MULTI_READ; break;
				case 24: mode = WRITE; break;
				case 25: mode = MULTI_WRITE; break;
				default: UNREACHABLE;
			}
			currentByteInSector = -1; // wait for token
		}
		break;
	case 41: // implementation of ACMD 41!!
		 // SD_SEND_OP_COND
		responseQueue.push_back(R1_BUSY);
		break;
	case 55: // APP_CMD
		// TODO: go to ACMD mode, but not necessary now
		responseQueue.push_back(R1_IDLE);
		break;
	case 58: // READ_OCR
		responseQueue.push_back({
			R1_BUSY,// R1 (OK) (ignored on MegaSD, checked in FUZIX)
			uint8_t(0x40),   // OCR Reg part 1 (SDHC: CCS=1)
			uint8_t(0x00),   // OCR Reg part 2
			uint8_t(0x00),   // OCR Reg part 3
			uint8_t(0x00)}); // OCR Reg part 4
		break;

	default:
		responseQueue.push_back(R1_ILLEGAL_COMMAND);
		break;
	}
}

static constexpr auto modeInfo = std::to_array<enum_string<SdCard::Mode>>({
	{ "COMMAND",     SdCard::Mode::COMMAND  },
	{ "READ",        SdCard::Mode::READ },
	{ "MULTI_READ",  SdCard::Mode::MULTI_READ },
	{ "WRITE",       SdCard::Mode::WRITE },
	{ "MULTI_WRITE", SdCard::Mode::MULTI_WRITE },
});
SERIALIZE_ENUM(SdCard::Mode, modeInfo);

template<typename Archive>
void SdCard::serialize(Archive& ar, unsigned /*version*/)
{
	ar.serialize("mode",   mode,
	             "cmdBuf", cmdBuf);
	ar.serialize_blob("sectorBuf", sectorBuf.raw);
	if (hd) ar.serialize("hd", *hd);
	ar.serialize("cmdIdx",               cmdIdx,
	             "transferDelayCounter", transferDelayCounter,
	             "responseQueue",        responseQueue,
	             "currentSector",        currentSector,
	             "currentByteInSector",  currentByteInSector);
}
INSTANTIATE_SERIALIZE_METHODS(SdCard);

} // namespace openmsx

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e8555c89 Andy McCall 1 month ago	1	#include "SdCard.hh"
	2
	3	#include "DeviceConfig.hh"
	4	#include "HD.hh"
	5	#include "MSXException.hh"
	6	#include "serialize.hh"
	7	#include "serialize_stl.hh"
	8
	9	#include "endian.hh"
	10	#include "narrow.hh"
	11	#include "unreachable.hh"
	12
	13	#include <memory>
	14
	15	// TODO:
	16	// - replace transferDelayCounter with 0xFF's in responseQueue?
	17	// - remove duplication between WRITE and MULTI_WRITE (is it worth it?)
	18	// - see TODOs in the code below
	19
	20	namespace openmsx {
	21
	22	// data response tokens
	23	static constexpr uint8_t DRT_ACCEPTED = 0x05;
	24	static constexpr uint8_t DRT_WRITE_ERROR = 0x0D;
	25
	26	// start block tokens and stop tran token
	27	static constexpr uint8_t START_BLOCK_TOKEN = 0xFE;
	28	static constexpr uint8_t START_BLOCK_TOKEN_MBW = 0xFC;
	29	static constexpr uint8_t STOP_TRAN_TOKEN = 0xFD;
	30
	31	// data error token
	32	static constexpr uint8_t DATA_ERROR_TOKEN_ERROR = 0x01;
	33	static constexpr uint8_t DATA_ERROR_TOKEN_OUT_OF_RANGE = 0x08;
	34
	35	// responses
	36	static constexpr uint8_t R1_BUSY = 0x00;
	37	static constexpr uint8_t R1_IDLE = 0x01; // TODO: why is lots of code checking for this instead of R1_BUSY?
	38	static constexpr uint8_t R1_ILLEGAL_COMMAND = 0x04;
	39	static constexpr uint8_t R1_PARAMETER_ERROR = 0x80;
	40
	41	SdCard::SdCard(const DeviceConfig& config)
	42	: hd(config.getXML() ? std::make_unique<HD>(config) : nullptr)
	43	{
	44	}
	45
	46	SdCard::~SdCard() = default;
	47
	48	// helper methods for 'transfer' to avoid duplication
	49	uint8_t SdCard::readCurrentByteFromCurrentSector()
	50	{
	51	uint8_t result = [&] {
	52	if (currentByteInSector == -1) {
	53	try {
	54	hd->readSector(currentSector, sectorBuf);
	55	return START_BLOCK_TOKEN;
	56	} catch (MSXException&) {
	57	return DATA_ERROR_TOKEN_ERROR;
	58	}
	59	} else {
	60	// output next byte from stream
	61	return sectorBuf.raw[currentByteInSector];
	62	}
	63	}();
	64	currentByteInSector++;
65	if (currentByteInSector == sizeof(sectorBuf)) {
66	responseQueue.push_back({uint8_t(0x00), uint8_t(0x00)}); // 2 CRC's (dummy)
67	}
68	return result;
69	}
70
71	uint8_t SdCard::transfer(uint8_t value, bool cs)
72	{
73	if (!hd) return 0xFF; // no card inserted
74
75	if (cs) {
76	// /CS is true: not for this chip
77	return 0xFF;
78	}
79
80	// process output
81	using enum Mode;
82	uint8_t retval = 0xFF;
83	if (transferDelayCounter > 0) {
84	--transferDelayCounter;
85	} else {
86	if (responseQueue.empty()) {
87	switch (mode) {
88	case READ:
89	retval = readCurrentByteFromCurrentSector();
90	if (currentByteInSector == sizeof(sectorBuf)) {
91	mode = COMMAND;
92	}
93	break;
94	case MULTI_READ:
95	// when there's an error, you probably have to send a CMD12
96	// to go back to the COMMAND mode. This is not
97	// clear in the spec (it's wrongly suggested
98	// for the MULTI_WRITE mode!)
99	if (currentSector >= hd->getNbSectors()) {
100	// data out of range, send data error token
101	retval = DATA_ERROR_TOKEN_OUT_OF_RANGE;
102	} else {
103	retval = readCurrentByteFromCurrentSector();
104	if (currentByteInSector == sizeof(sectorBuf)) {
105	currentSector++;
106	currentByteInSector = -1;
107	}
108	}
109	break;
110	case WRITE:
111	case MULTI_WRITE:
112	// apparently nothing is returned while writing
113	case COMMAND:
114	default:
115	break;
116	}
117	} else {
118	retval = responseQueue.pop_front();
119	}
120	}
121
122	// process input
123	switch (mode) {
124	case WRITE:
125	// first check for data token
126	if (currentByteInSector == -1) {
127	if (value == START_BLOCK_TOKEN) {
128	currentByteInSector++;
129	}
130	break;
131	}
132	if (currentByteInSector < int(sizeof(sectorBuf))) {
133	sectorBuf.raw[currentByteInSector] = value;
134	}
135	currentByteInSector++;
136	if (currentByteInSector == (sizeof(sectorBuf) + 2)) {
137	uint8_t response = DRT_ACCEPTED;
138	// copy buffer to SD card
139	try {
140	hd->writeSector(currentSector, sectorBuf);
141	} catch (MSXException&) {
142	response = DRT_WRITE_ERROR;
143	}
144	mode = COMMAND;
145	transferDelayCounter = 1;
146	responseQueue.push_back(response);
147	}
148	break;
149	case MULTI_WRITE:
150	// first check for stop or start token
151	if (currentByteInSector == -1) {
152	if (value == STOP_TRAN_TOKEN) {
153	mode = COMMAND;
154	}
155	if (value == START_BLOCK_TOKEN_MBW) {
156	currentByteInSector++;
157	}
158	break;
159	}
160	if (currentByteInSector < int(sizeof(sectorBuf))) {
161	sectorBuf.raw[currentByteInSector] = value;
162	}
163	currentByteInSector++;
164	if (currentByteInSector == (sizeof(sectorBuf) + 2)) {
165	// check if still in valid range
166	uint8_t response = DRT_ACCEPTED;
167	if (currentSector >= hd->getNbSectors()) {
168	response = DRT_WRITE_ERROR;
169	// note: mode is not changed, should be done by
170	// the host with CMD12 (STOP_TRANSMISSION) -
171	// however, this makes no sense, CMD12 is only
172	// for Multiple Block Read!? Wrong in the spec?
173	} else {
174	// copy buffer to SD card
175	try {
176	hd->writeSector(currentSector, sectorBuf);
177	currentByteInSector = -1;
178	currentSector++;
179	} catch (MSXException&) {
180	response = DRT_WRITE_ERROR;
181	// note: mode is not changed, should be
182	// done by the host with CMD12
183	// (STOP_TRANSMISSION) - however, this
184	// makes no sense, CMD12 is only for
185	// Multiple Block Read!? Wrong in the
186	// spec?
187	}
188	}
189	transferDelayCounter = 1;
190	responseQueue.push_back(response);
191	}
192	break;
193	case COMMAND:
194	default:
195	if ((cmdIdx == 0 && (value >> 6) == 1) // command start
196	\|\| cmdIdx > 0) { // command in progress
197	cmdBuf[cmdIdx] = value;
198	++cmdIdx;
199	if (cmdIdx == 6) {
200	executeCommand();
201	cmdIdx = 0;
202	}
203	}
204	break;
205	}
206
207	return retval;
208	}
209
210	void SdCard::executeCommand()
211	{
212	// it takes 2 transfers (2x8 cycles) before a reply
213	// can be given to a command
214	using enum Mode;
215	transferDelayCounter = 2;
216	uint8_t command = cmdBuf[0] & 0x3F;
217	switch (command) {
218	case 0: // GO_IDLE_STATE
219	responseQueue.clear();
220	mode = COMMAND;
221	responseQueue.push_back(R1_IDLE);
222	break;
223	case 8: // SEND_IF_COND
224	// conditions are always OK
225	responseQueue.push_back({
226	R1_IDLE, // R1 (OK) SDHC (checked by MegaSD and FUZIX)
227	uint8_t(0x02), // command version
228	uint8_t(0x00), // reserved
229	uint8_t(0x01), // voltage accepted
230	cmdBuf[4]});// check pattern
231	break;
232	case 9:{ // SEND_CSD
233	responseQueue.push_back({
234	R1_BUSY, // OK (ignored on MegaSD code, used in FUZIX)
235	// now follows a CSD version 2.0 (for SDHC)
236	START_BLOCK_TOKEN, // data token
237	uint8_t(0x40), // CSD_STRUCTURE [127:120]
238	uint8_t(0x0E), // (TAAC)
239	uint8_t(0x00), // (NSAC)
240	uint8_t(0x32), // (TRAN_SPEED)
241	uint8_t(0x00), // CCC
242	uint8_t(0x00), // CCC / (READ_BL_LEN)
243	uint8_t(0x00)}); // (RBP)/(WBM)/(RBM)/ DSR_IMP
244	// SD_CARD_SIZE = (C_SIZE + 1) * 512kByte
245	auto c_size = narrow<uint32_t>((hd->getNbSectors() * sizeof(sectorBuf)) / size_t(512 * 1024) - 1);
246	responseQueue.push_back({
247	uint8_t((c_size >> 16) & 0x3F), // C_SIZE 1
248	uint8_t((c_size >> 8) & 0xFF), // C_SIZE 2
249	uint8_t((c_size >> 0) & 0xFF), // C_SIZE 3
250	uint8_t(0x00), // res/(EBE)/(SS1)
251	uint8_t(0x00), // (SS2)/(WGS)
252	uint8_t(0x00), // (WGE)/res/(RF)/(WBL1)
253	uint8_t(0x00), // (WBL2)/(WBP)/res
254	uint8_t(0x00), // (FFG)/COPY/PWP/TWP/(FF)/res
255	uint8_t(0x01)}); // CRC / 1
256	break;}
257	case 10: // SEND_CID
258	responseQueue.push_back({
259	R1_BUSY, // OK (ignored on MegaSD, unused in FUZIX so far)
260	START_BLOCK_TOKEN, // data token
261	uint8_t(0xAA), // CID01 // manuf ID
262	uint8_t('o' ), // CID02 // OEM/App ID 1
263	uint8_t('p' ), // CID03 // OEM/App ID 2
264	uint8_t('e' ), // CID04 // Prod name 1
265	uint8_t('n' ), // CID05 // Prod name 2
266	uint8_t('M' ), // CID06 // Prod name 3
267	uint8_t('S' ), // CID07 // Prod name 4
268	uint8_t('X' ), // CID08 // Prod name 5
269	uint8_t(0x01), // CID09 // Prod Revision
270	uint8_t(0x12), // CID10 // Prod Serial 1
271	uint8_t(0x34), // CID11 // Prod Serial 2
272	uint8_t(0x56), // CID12 // Prod Serial 3
273	uint8_t(0x78), // CID13 // Prod Serial 4
274	uint8_t(0x00), // CID14 // reserved / Y1
275	uint8_t(0xE6), // CID15 // Y2 / M
276	uint8_t(0x01)}); // CID16 // CRC / not used
277	break;
278	case 12: // STOP TRANSMISSION
279	responseQueue.push_back(R1_IDLE); // R1 (OK)
280	mode = COMMAND;
281	break;
282	case 16: // SET_BLOCK_LEN
283	responseQueue.push_back(R1_IDLE); // OK, we don't really care
284	break;
285	case 17: // READ_SINGLE_BLOCK
286	case 18: // READ_MULTIPLE_BLOCK
287	case 24: // WRITE_BLOCK
288	case 25: // WRITE_MULTIPLE_BLOCK
289	// SDHC so the address is the sector
290	currentSector = Endian::readB32(&cmdBuf[1]);
291	if (currentSector >= hd->getNbSectors()) {
292	responseQueue.push_back(R1_PARAMETER_ERROR);
293	} else {
294	responseQueue.push_back(R1_BUSY);
295	switch (command) {
296	case 17: mode = READ; break;
297	case 18: mode = MULTI_READ; break;
298	case 24: mode = WRITE; break;
299	case 25: mode = MULTI_WRITE; break;
300	default: UNREACHABLE;
301	}
302	currentByteInSector = -1; // wait for token
303	}
304	break;
305	case 41: // implementation of ACMD 41!!
306	// SD_SEND_OP_COND
307	responseQueue.push_back(R1_BUSY);
308	break;
309	case 55: // APP_CMD
310	// TODO: go to ACMD mode, but not necessary now
311	responseQueue.push_back(R1_IDLE);
312	break;
313	case 58: // READ_OCR
314	responseQueue.push_back({
315	R1_BUSY,// R1 (OK) (ignored on MegaSD, checked in FUZIX)
316	uint8_t(0x40), // OCR Reg part 1 (SDHC: CCS=1)
317	uint8_t(0x00), // OCR Reg part 2
318	uint8_t(0x00), // OCR Reg part 3
319	uint8_t(0x00)}); // OCR Reg part 4
320	break;
321
322	default:
323	responseQueue.push_back(R1_ILLEGAL_COMMAND);
324	break;
325	}
326	}
327
328	static constexpr auto modeInfo = std::to_array<enum_string<SdCard::Mode>>({
329	{ "COMMAND", SdCard::Mode::COMMAND },
330	{ "READ", SdCard::Mode::READ },
331	{ "MULTI_READ", SdCard::Mode::MULTI_READ },
332	{ "WRITE", SdCard::Mode::WRITE },
333	{ "MULTI_WRITE", SdCard::Mode::MULTI_WRITE },
334	});
335	SERIALIZE_ENUM(SdCard::Mode, modeInfo);
336
337	template<typename Archive>
338	void SdCard::serialize(Archive& ar, unsigned /version/)
339	{
340	ar.serialize("mode", mode,
341	"cmdBuf", cmdBuf);
342	ar.serialize_blob("sectorBuf", sectorBuf.raw);
343	if (hd) ar.serialize("hd", *hd);
344	ar.serialize("cmdIdx", cmdIdx,
345	"transferDelayCounter", transferDelayCounter,
346	"responseQueue", responseQueue,
347	"currentSector", currentSector,
348	"currentByteInSector", currentByteInSector);
349	}
350	INSTANTIATE_SERIALIZE_METHODS(SdCard);
351
352	} // namespace openmsx

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