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LinkRawWireless.hpp
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LinkRawWireless.hpp
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#ifndef LINK_RAW_WIRELESS_H
#define LINK_RAW_WIRELESS_H
// --------------------------------------------------------------------------
// A low level driver for the GBA Wireless Adapter.
// --------------------------------------------------------------------------
// - Advanced usage only!
// - If you're building a game, use `LinkWireless`.
// --------------------------------------------------------------------------
#include <tonc_core.h>
#include <tonc_math.h>
#include <array>
#include <cstring>
#include "LinkGPIO.hpp"
#include "LinkSPI.hpp"
// Enable logging (set `linkRawWireless->logger` and uncomment to enable)
// #define LINK_RAW_WIRELESS_ENABLE_LOGGING
#ifdef LINK_RAW_WIRELESS_ENABLE_LOGGING
#include <string>
#define LRWLOG(str) logger(str)
#else
#define LRWLOG(str)
#endif
#define LINK_RAW_WIRELESS_MAX_PLAYERS 5
#define LINK_RAW_WIRELESS_PING_WAIT 50
#define LINK_RAW_WIRELESS_TRANSFER_WAIT 15
#define LINK_RAW_WIRELESS_CMD_TIMEOUT 100
#define LINK_RAW_WIRELESS_MAX_COMMAND_RESPONSE_LENGTH 30
#define LINK_RAW_WIRELESS_MAX_CLIENT_TRANSFER_LENGTH 4
#define LINK_RAW_WIRELESS_MAX_GAME_ID 0x7fff
#define LINK_RAW_WIRELESS_MAX_GAME_NAME_LENGTH 14
#define LINK_RAW_WIRELESS_MAX_USER_NAME_LENGTH 8
#define LINK_RAW_WIRELESS_LOGIN_STEPS 9
#define LINK_RAW_WIRELESS_COMMAND_HEADER 0x9966
#define LINK_RAW_WIRELESS_RESPONSE_ACK 0x80
#define LINK_RAW_WIRELESS_DATA_REQUEST 0x80000000
#define LINK_RAW_WIRELESS_SETUP_MAGIC 0x003c0000
#define LINK_RAW_WIRELESS_STILL_CONNECTING 0x01000000
#define LINK_RAW_WIRELESS_BROADCAST_LENGTH 6
#define LINK_RAW_WIRELESS_BROADCAST_RESPONSE_LENGTH \
(1 + LINK_RAW_WIRELESS_BROADCAST_LENGTH)
#define LINK_RAW_WIRELESS_MAX_COMMAND_TRANSFER_LENGTH 23
#define LINK_RAW_WIRELESS_MAX_SERVERS \
(LINK_RAW_WIRELESS_MAX_COMMAND_RESPONSE_LENGTH / \
LINK_RAW_WIRELESS_BROADCAST_RESPONSE_LENGTH)
#define LINK_RAW_WIRELESS_COMMAND_HELLO 0x10
#define LINK_RAW_WIRELESS_COMMAND_SETUP 0x17
#define LINK_RAW_WIRELESS_COMMAND_BROADCAST 0x16
#define LINK_RAW_WIRELESS_COMMAND_START_HOST 0x19
#define LINK_RAW_WIRELESS_COMMAND_SLOT_STATUS 0x14
#define LINK_RAW_WIRELESS_COMMAND_ACCEPT_CONNECTIONS 0x1a
#define LINK_RAW_WIRELESS_COMMAND_END_HOST 0x1b
#define LINK_RAW_WIRELESS_COMMAND_BROADCAST_READ_START 0x1c
#define LINK_RAW_WIRELESS_COMMAND_BROADCAST_READ_POLL 0x1d
#define LINK_RAW_WIRELESS_COMMAND_BROADCAST_READ_END 0x1e
#define LINK_RAW_WIRELESS_COMMAND_CONNECT 0x1f
#define LINK_RAW_WIRELESS_COMMAND_IS_FINISHED_CONNECT 0x20
#define LINK_RAW_WIRELESS_COMMAND_FINISH_CONNECTION 0x21
#define LINK_RAW_WIRELESS_COMMAND_SEND_DATA 0x24
#define LINK_RAW_WIRELESS_COMMAND_SEND_DATA_AND_WAIT 0x25
#define LINK_RAW_WIRELESS_COMMAND_RECEIVE_DATA 0x26
#define LINK_RAW_WIRELESS_COMMAND_WAIT 0x27
#define LINK_RAW_WIRELESS_COMMAND_BYE 0x3d
static volatile char LINK_RAW_WIRELESS_VERSION[] = "LinkRawWireless/v6.3.0";
const u16 LINK_RAW_WIRELESS_LOGIN_PARTS[] = {
0x494e, 0x494e, 0x544e, 0x544e, 0x4e45, 0x4e45, 0x4f44, 0x4f44, 0x8001};
class LinkRawWireless {
public:
#ifdef LINK_RAW_WIRELESS_ENABLE_LOGGING
typedef void (*Logger)(std::string);
Logger logger = [](std::string str) {};
#endif
enum State {
NEEDS_RESET,
AUTHENTICATED,
SEARCHING,
SERVING,
CONNECTING,
CONNECTED
};
struct CommandResult {
bool success = false;
u32 responses[LINK_RAW_WIRELESS_MAX_COMMAND_RESPONSE_LENGTH];
u32 responsesSize = 0;
};
struct RemoteCommand {
bool success = false;
u8 commandId = 0;
u32 params[LINK_RAW_WIRELESS_MAX_COMMAND_TRANSFER_LENGTH];
u32 paramsSize = 0;
};
struct Server {
u16 id = 0;
u16 gameId;
char gameName[LINK_RAW_WIRELESS_MAX_GAME_NAME_LENGTH + 1];
char userName[LINK_RAW_WIRELESS_MAX_USER_NAME_LENGTH + 1];
u8 nextClientNumber;
bool isFull() { return nextClientNumber == 0xff; }
};
struct ConnectedClient {
u16 deviceId = 0;
u8 clientNumber = 0;
};
struct SlotStatusResponse {
u8 nextClientNumber = 0;
std::array<ConnectedClient, LINK_RAW_WIRELESS_MAX_PLAYERS>
connectedClients = {};
u32 connectedClientsSize = 0;
};
struct AcceptConnectionsResponse {
std::array<ConnectedClient, LINK_RAW_WIRELESS_MAX_PLAYERS>
connectedClients = {};
u32 connectedClientsSize = 0;
};
struct BroadcastReadPollResponse {
std::array<Server, LINK_RAW_WIRELESS_MAX_SERVERS> servers;
u32 serversSize = 0;
};
enum ConnectionPhase { STILL_CONNECTING, ERROR, SUCCESS };
struct ConnectionStatus {
ConnectionPhase phase = STILL_CONNECTING;
u8 assignedClientNumber = 0;
};
struct ReceiveDataResponse {
u32 sentBytes[LINK_RAW_WIRELESS_MAX_PLAYERS];
u32 data[LINK_RAW_WIRELESS_MAX_COMMAND_TRANSFER_LENGTH];
u32 dataSize = 0;
};
bool isActive() { return isEnabled; }
bool activate() {
isEnabled = false;
bool success = reset(true);
isEnabled = true;
return success;
}
bool deactivate() {
bool success = sendCommand(LINK_RAW_WIRELESS_COMMAND_BYE).success;
isEnabled = false;
resetState();
stop();
return success;
}
bool setup(u8 maxPlayers = LINK_RAW_WIRELESS_MAX_PLAYERS,
u8 maxTransmissions = 4,
u8 waitTimeout = 32,
u32 magic = LINK_RAW_WIRELESS_SETUP_MAGIC) {
u32 config =
(u32)(magic |
(((LINK_RAW_WIRELESS_MAX_PLAYERS - maxPlayers) & 0b11) << 16) |
(maxTransmissions << 8) | waitTimeout);
return sendCommand(LINK_RAW_WIRELESS_COMMAND_SETUP, {config}, 1).success;
}
bool broadcast(const char* gameName = "",
const char* userName = "",
u16 gameId = LINK_RAW_WIRELESS_MAX_GAME_ID) {
if (std::strlen(gameName) > LINK_RAW_WIRELESS_MAX_GAME_NAME_LENGTH) {
LRWLOG("! game name too long");
return false;
}
if (std::strlen(userName) > LINK_RAW_WIRELESS_MAX_GAME_NAME_LENGTH) {
LRWLOG("! user name too long");
return false;
}
char finalGameName[LINK_RAW_WIRELESS_MAX_GAME_NAME_LENGTH + 1];
char finalUserName[LINK_RAW_WIRELESS_MAX_USER_NAME_LENGTH + 1];
copyName(finalGameName, gameName, LINK_RAW_WIRELESS_MAX_GAME_NAME_LENGTH);
copyName(finalUserName, userName, LINK_RAW_WIRELESS_MAX_USER_NAME_LENGTH);
bool success =
sendCommand(
LINK_RAW_WIRELESS_COMMAND_BROADCAST,
{buildU32(buildU16(finalGameName[1], finalGameName[0]), gameId),
buildU32(buildU16(finalGameName[5], finalGameName[4]),
buildU16(finalGameName[3], finalGameName[2])),
buildU32(buildU16(finalGameName[9], finalGameName[8]),
buildU16(finalGameName[7], finalGameName[6])),
buildU32(buildU16(finalGameName[13], finalGameName[12]),
buildU16(finalGameName[11], finalGameName[10])),
buildU32(buildU16(finalUserName[3], finalUserName[2]),
buildU16(finalUserName[1], finalUserName[0])),
buildU32(buildU16(finalUserName[7], finalUserName[6]),
buildU16(finalUserName[5], finalUserName[4]))},
LINK_RAW_WIRELESS_BROADCAST_LENGTH)
.success;
if (!success) {
reset();
return false;
}
return true;
}
bool startHost() {
bool success = sendCommand(LINK_RAW_WIRELESS_COMMAND_START_HOST).success;
if (!success) {
reset();
return false;
}
wait(LINK_RAW_WIRELESS_TRANSFER_WAIT);
LRWLOG("state = SERVING");
state = SERVING;
return true;
}
bool getSlotStatus(SlotStatusResponse& response) {
auto result = sendCommand(LINK_RAW_WIRELESS_COMMAND_SLOT_STATUS);
if (!result.success) {
reset();
return false;
}
response.connectedClientsSize = 0;
for (u32 i = 0; i < result.responsesSize; i++) {
if (i == 0) {
response.nextClientNumber = (u8)lsB32(result.responses[i]);
} else {
response.connectedClients[response.connectedClientsSize++] =
ConnectedClient{.deviceId = lsB32(result.responses[i]),
.clientNumber = (u8)msB32(result.responses[i])};
}
}
return true;
}
bool acceptConnections(AcceptConnectionsResponse& response) {
auto result = sendCommand(LINK_RAW_WIRELESS_COMMAND_ACCEPT_CONNECTIONS);
if (!result.success) {
reset();
return false;
}
response.connectedClientsSize = 0;
for (u32 i = 0; i < result.responsesSize; i++) {
response.connectedClients[response.connectedClientsSize++] =
ConnectedClient{.deviceId = lsB32(result.responses[i]),
.clientNumber = (u8)msB32(result.responses[i])};
}
u8 oldPlayerCount = sessionState.playerCount;
sessionState.playerCount = 1 + result.responsesSize;
if (sessionState.playerCount != oldPlayerCount)
LRWLOG("now: " + std::to_string(sessionState.playerCount) + " players");
return true;
}
bool endHost(AcceptConnectionsResponse& response) {
auto result = sendCommand(LINK_RAW_WIRELESS_COMMAND_END_HOST);
if (!result.success) {
reset();
return false;
}
response.connectedClientsSize = 0;
for (u32 i = 0; i < result.responsesSize; i++) {
response.connectedClients[response.connectedClientsSize++] =
ConnectedClient{.deviceId = lsB32(result.responses[i]),
.clientNumber = (u8)msB32(result.responses[i])};
}
u8 oldPlayerCount = sessionState.playerCount;
sessionState.playerCount = 1 + result.responsesSize;
if (sessionState.playerCount != oldPlayerCount)
LRWLOG("now: " + std::to_string(sessionState.playerCount) + " players");
return true;
}
bool broadcastReadStart() {
bool success =
sendCommand(LINK_RAW_WIRELESS_COMMAND_BROADCAST_READ_START).success;
if (!success) {
reset();
return false;
}
LRWLOG("state = SEARCHING");
state = SEARCHING;
return true;
}
bool broadcastReadPoll(BroadcastReadPollResponse& response) {
auto result = sendCommand(LINK_RAW_WIRELESS_COMMAND_BROADCAST_READ_POLL);
bool success =
result.success &&
result.responsesSize % LINK_RAW_WIRELESS_BROADCAST_RESPONSE_LENGTH == 0;
if (!success) {
reset();
return false;
}
u32 totalBroadcasts =
result.responsesSize / LINK_RAW_WIRELESS_BROADCAST_RESPONSE_LENGTH;
response.serversSize = 0;
for (u32 i = 0; i < totalBroadcasts; i++) {
u32 start = LINK_RAW_WIRELESS_BROADCAST_RESPONSE_LENGTH * i;
Server server;
server.id = (u16)result.responses[start];
server.gameId =
result.responses[start + 1] & LINK_RAW_WIRELESS_MAX_GAME_ID;
u32 gameI = 0, userI = 0;
recoverName(server.gameName, gameI, result.responses[start + 1], false);
recoverName(server.gameName, gameI, result.responses[start + 2]);
recoverName(server.gameName, gameI, result.responses[start + 3]);
recoverName(server.gameName, gameI, result.responses[start + 4]);
recoverName(server.userName, userI, result.responses[start + 5]);
recoverName(server.userName, userI, result.responses[start + 6]);
server.gameName[gameI] = '\0';
server.userName[userI] = '\0';
server.nextClientNumber = (result.responses[start] >> 16) & 0xff;
response.servers[response.serversSize++] = server;
}
return true;
}
bool broadcastReadEnd() {
bool success =
sendCommand(LINK_RAW_WIRELESS_COMMAND_BROADCAST_READ_END).success;
if (!success) {
reset();
return false;
}
LRWLOG("state = AUTHENTICATED");
state = AUTHENTICATED;
return true;
}
bool connect(u16 serverId) {
bool success =
sendCommand(LINK_RAW_WIRELESS_COMMAND_CONNECT, {serverId}, 1).success;
if (!success) {
reset();
return false;
}
LRWLOG("state = CONNECTING");
state = CONNECTING;
return true;
}
bool keepConnecting(ConnectionStatus& response) {
auto result = sendCommand(LINK_RAW_WIRELESS_COMMAND_IS_FINISHED_CONNECT);
if (!result.success || result.responsesSize == 0) {
if (result.responsesSize == 0)
LRWLOG("! empty response");
reset();
return false;
}
if (result.responses[0] == LINK_RAW_WIRELESS_STILL_CONNECTING) {
response.phase = STILL_CONNECTING;
return true;
}
u8 assignedPlayerId = 1 + (u8)msB32(result.responses[0]);
if (assignedPlayerId >= LINK_RAW_WIRELESS_MAX_PLAYERS) {
LRWLOG("! connection failed (1)");
reset();
response.phase = ERROR;
return false;
}
response.phase = SUCCESS;
response.assignedClientNumber = (u8)msB32(result.responses[0]);
return true;
}
bool finishConnection() {
auto result = sendCommand(LINK_RAW_WIRELESS_COMMAND_FINISH_CONNECTION);
if (!result.success || result.responsesSize == 0) {
if (result.responsesSize == 0)
LRWLOG("! empty response");
reset();
return false;
}
u16 status = msB32(result.responses[0]);
if ((msB16(status) & 1) == 1) {
LRWLOG("! connection failed (2)");
reset();
return false;
}
u8 assignedPlayerId = 1 + (u8)status;
sessionState.currentPlayerId = assignedPlayerId;
LRWLOG("state = CONNECTED");
state = CONNECTED;
return true;
}
bool sendData(
std::array<u32, LINK_RAW_WIRELESS_MAX_COMMAND_TRANSFER_LENGTH> data,
u32 dataSize,
u32 _bytes = 0) {
u32 bytes = _bytes == 0 ? dataSize * 4 : _bytes;
u32 header = sessionState.currentPlayerId == 0
? bytes
: (bytes << (3 + sessionState.currentPlayerId * 5));
for (u32 i = dataSize; i > 0; i--)
data[i] = data[i - 1];
data[0] = header;
dataSize++;
LRWLOG("using header " + toHex(header));
bool success =
sendCommand(LINK_RAW_WIRELESS_COMMAND_SEND_DATA, data, dataSize)
.success;
if (!success) {
reset();
return false;
}
return true;
}
bool sendDataAndWait(
std::array<u32, LINK_RAW_WIRELESS_MAX_COMMAND_TRANSFER_LENGTH> data,
u32 dataSize,
RemoteCommand& remoteCommand,
u32 _bytes = 0) {
u32 bytes = _bytes == 0 ? dataSize * 4 : _bytes;
u32 header = sessionState.currentPlayerId == 0
? bytes
: (bytes << (3 + sessionState.currentPlayerId * 5));
for (u32 i = dataSize; i > 0; i--)
data[i] = data[i - 1];
data[0] = header;
dataSize++;
LRWLOG("using header " + toHex(header));
if (!sendCommand(LINK_RAW_WIRELESS_COMMAND_SEND_DATA_AND_WAIT, data,
dataSize, true)
.success) {
reset();
return false;
}
remoteCommand = receiveCommandFromAdapter();
return remoteCommand.success;
}
bool receiveData(ReceiveDataResponse& response) {
auto result = sendCommand(LINK_RAW_WIRELESS_COMMAND_RECEIVE_DATA);
for (u32 i = 0; i < result.responsesSize; i++)
response.data[i] = result.responses[i];
response.dataSize = result.responsesSize;
if (!result.success) {
reset();
return false;
}
for (u32 i = 0; i < LINK_RAW_WIRELESS_MAX_PLAYERS; i++)
response.sentBytes[i] = 0;
if (response.dataSize > 0) {
u32 header = response.data[0];
for (u32 i = 1; i < response.dataSize; i++)
response.data[i - 1] = response.data[i];
response.dataSize--;
response.sentBytes[0] = header & 0b1111111;
response.sentBytes[1] = (header >> 8) & 0b11111;
response.sentBytes[2] = (header >> 13) & 0b11111;
response.sentBytes[3] = (header >> 18) & 0b11111;
response.sentBytes[4] = (header >> 23) & 0b11111;
}
return true;
}
bool wait(RemoteCommand& remoteCommand) {
if (!sendCommand(LINK_RAW_WIRELESS_COMMAND_WAIT, {}, 0, true).success) {
reset();
return false;
}
remoteCommand = receiveCommandFromAdapter();
return remoteCommand.success;
}
CommandResult sendCommand(
u8 type,
std::array<u32, LINK_RAW_WIRELESS_MAX_COMMAND_TRANSFER_LENGTH> params =
{},
u16 length = 0,
bool invertsClock = false) {
CommandResult result;
u32 command = buildCommand(type, length);
u32 r;
LRWLOG("sending command 0x" + toHex(command));
if ((r = transfer(command)) != LINK_RAW_WIRELESS_DATA_REQUEST) {
logExpectedButReceived(LINK_RAW_WIRELESS_DATA_REQUEST, r);
return result;
}
u32 parameterCount = 0;
for (u32 i = 0; i < length; i++) {
u32 param = params[i];
LRWLOG("sending param" + std::to_string(parameterCount) + ": 0x" +
toHex(param));
if ((r = transfer(param)) != LINK_RAW_WIRELESS_DATA_REQUEST) {
logExpectedButReceived(LINK_RAW_WIRELESS_DATA_REQUEST, r);
return result;
}
parameterCount++;
}
LRWLOG("sending response request");
u32 response =
invertsClock
? transferAndStartClockInversionACK(LINK_RAW_WIRELESS_DATA_REQUEST)
: transfer(LINK_RAW_WIRELESS_DATA_REQUEST);
u16 header = msB32(response);
u16 data = lsB32(response);
u8 responses = msB16(data);
u8 ack = lsB16(data);
if (header != LINK_RAW_WIRELESS_COMMAND_HEADER) {
LRWLOG("! expected HEADER 0x9966");
LRWLOG("! but received 0x" + toHex(header));
return result;
}
if (ack != type + LINK_RAW_WIRELESS_RESPONSE_ACK) {
if (ack == 0xee && responses == 1 && !invertsClock) {
u8 __attribute__((unused)) code =
(u8)transfer(LINK_RAW_WIRELESS_DATA_REQUEST);
LRWLOG("! error received");
LRWLOG(code == 1 ? "! invalid state" : "! unknown cmd");
} else {
LRWLOG("! expected ACK 0x" +
toHex(type + LINK_RAW_WIRELESS_RESPONSE_ACK));
LRWLOG("! but received 0x" + toHex(ack));
}
return result;
}
LRWLOG("ack ok! " + std::to_string(responses) + " responses");
if (!invertsClock) {
for (u32 i = 0; i < responses; i++) {
LRWLOG("response " + std::to_string(i + 1) + "/" +
std::to_string(responses) + ":");
u32 responseData = transfer(LINK_RAW_WIRELESS_DATA_REQUEST);
result.responses[result.responsesSize++] = responseData;
LRWLOG("<< " + toHex(responseData));
}
}
result.success = true;
return result;
}
RemoteCommand receiveCommandFromAdapter() {
RemoteCommand remoteCommand;
LRWLOG("setting SPI to SLAVE");
linkSPI->activate(LinkSPI::Mode::SLAVE);
LRWLOG("WAITING for adapter cmd");
u32 command = linkSPI->transfer(
LINK_RAW_WIRELESS_DATA_REQUEST, []() { return false; }, false, true);
if (!reverseAcknowledge()) {
linkSPI->activate(LinkSPI::Mode::MASTER_2MBPS);
reset();
return remoteCommand;
}
u16 header = msB32(command);
u16 data = lsB32(command);
u8 params = msB16(data);
u8 commandId = lsB16(data);
if (header != LINK_RAW_WIRELESS_COMMAND_HEADER) {
LRWLOG("! expected HEADER 0x9966");
LRWLOG("! but received 0x" + toHex(header));
linkSPI->activate(LinkSPI::Mode::MASTER_2MBPS);
reset();
return remoteCommand;
}
LRWLOG("received cmd: " + toHex(commandId) + " (" + std::to_string(params) +
" params)");
for (u32 i = 0; i < params; i++) {
LRWLOG("param " + std::to_string(i + 1) + "/" + std::to_string(params) +
":");
u32 paramData = linkSPI->transfer(
LINK_RAW_WIRELESS_DATA_REQUEST, []() { return false; }, false, true);
if (!reverseAcknowledge()) {
linkSPI->activate(LinkSPI::Mode::MASTER_2MBPS);
reset();
return remoteCommand;
}
remoteCommand.params[remoteCommand.paramsSize++] = paramData;
LRWLOG("<< " + toHex(paramData));
}
LRWLOG("sending ack");
command = linkSPI->transfer(
0x99660000 | ((commandId + 0x80) & 0xff), []() { return false; }, false,
true);
if (!reverseAcknowledge(true)) {
linkSPI->activate(LinkSPI::Mode::MASTER_2MBPS);
reset();
return remoteCommand;
}
if (command != LINK_RAW_WIRELESS_DATA_REQUEST) {
LRWLOG("! expected CMD request");
LRWLOG("! but received 0x" + toHex(command));
linkSPI->activate(LinkSPI::Mode::MASTER_2MBPS);
reset();
return remoteCommand;
}
LRWLOG("setting SPI to 2Mbps");
linkSPI->activate(LinkSPI::Mode::MASTER_2MBPS);
wait(LINK_RAW_WIRELESS_TRANSFER_WAIT);
remoteCommand.success = true;
remoteCommand.commandId = commandId;
return remoteCommand;
}
u32 getDeviceTransferLength() {
return state == SERVING ? LINK_RAW_WIRELESS_MAX_COMMAND_TRANSFER_LENGTH
: LINK_RAW_WIRELESS_MAX_CLIENT_TRANSFER_LENGTH;
}
State getState() { return state; }
bool isConnected() { return sessionState.playerCount > 1; }
bool isSessionActive() { return state == SERVING || state == CONNECTED; }
u8 playerCount() { return sessionState.playerCount; }
u8 currentPlayerId() { return sessionState.currentPlayerId; }
~LinkRawWireless() {
delete linkSPI;
delete linkGPIO;
}
struct SessionState {
u8 playerCount = 1;
u8 currentPlayerId = 0;
};
struct LoginMemory {
u16 previousGBAData = 0xffff;
u16 previousAdapterData = 0xffff;
};
SessionState sessionState;
LinkSPI* linkSPI = new LinkSPI();
LinkGPIO* linkGPIO = new LinkGPIO();
State state = NEEDS_RESET;
volatile bool isEnabled = false;
void copyName(char* target, const char* source, u32 length) {
u32 len = std::strlen(source);
for (u32 i = 0; i < length + 1; i++)
if (i < len)
target[i] = source[i];
else
target[i] = '\0';
}
void recoverName(char* name,
u32& nameCursor,
u32 word,
bool includeFirstTwoBytes = true) {
u32 character = 0;
if (includeFirstTwoBytes) {
character = lsB16(lsB32(word));
if (character > 0)
name[nameCursor++] = character;
character = msB16(lsB32(word));
if (character > 0)
name[nameCursor++] = character;
}
character = lsB16(msB32(word));
if (character > 0)
name[nameCursor++] = character;
character = msB16(msB32(word));
if (character > 0)
name[nameCursor++] = character;
}
bool reset(bool initialize = false) {
resetState();
if (initialize)
stop();
return initialize && start();
}
void resetState() {
LRWLOG("state = NEEDS_RESET");
this->state = NEEDS_RESET;
this->sessionState.playerCount = 1;
this->sessionState.currentPlayerId = 0;
}
void stop() { linkSPI->deactivate(); }
bool start() {
pingAdapter();
LRWLOG("setting SPI to 256Kbps");
linkSPI->activate(LinkSPI::Mode::MASTER_256KBPS);
if (!login())
return false;
wait(LINK_RAW_WIRELESS_TRANSFER_WAIT);
LRWLOG("sending HELLO command");
if (!sendCommand(LINK_RAW_WIRELESS_COMMAND_HELLO).success)
return false;
LRWLOG("setting SPI to 2Mbps");
linkSPI->activate(LinkSPI::Mode::MASTER_2MBPS);
LRWLOG("state = AUTHENTICATED");
state = AUTHENTICATED;
return true;
}
void pingAdapter() {
LRWLOG("setting SO as OUTPUT");
linkGPIO->setMode(LinkGPIO::Pin::SO, LinkGPIO::Direction::OUTPUT);
LRWLOG("setting SD as OUTPUT");
linkGPIO->setMode(LinkGPIO::Pin::SD, LinkGPIO::Direction::OUTPUT);
LRWLOG("setting SD = HIGH");
linkGPIO->writePin(LinkGPIO::SD, true);
wait(LINK_RAW_WIRELESS_PING_WAIT);
LRWLOG("setting SD = LOW");
linkGPIO->writePin(LinkGPIO::SD, false);
}
bool login() {
LoginMemory memory;
LRWLOG("sending initial login packet");
if (!exchangeLoginPacket(LINK_RAW_WIRELESS_LOGIN_PARTS[0], 0, memory))
return false;
for (u32 i = 0; i < LINK_RAW_WIRELESS_LOGIN_STEPS; i++) {
LRWLOG("sending login packet " + std::to_string(i + 1) + "/" +
std::to_string(LINK_RAW_WIRELESS_LOGIN_STEPS));
if (!exchangeLoginPacket(LINK_RAW_WIRELESS_LOGIN_PARTS[i],
LINK_RAW_WIRELESS_LOGIN_PARTS[i], memory))
return false;
}
return true;
}
bool exchangeLoginPacket(u16 data,
u16 expectedResponse,
LoginMemory& memory) {
u32 packet = buildU32(~memory.previousAdapterData, data);
u32 response = transfer(packet, false);
if (msB32(response) != expectedResponse ||
lsB32(response) != (u16)~memory.previousGBAData) {
logExpectedButReceived(
buildU32(expectedResponse, (u16)~memory.previousGBAData), response);
return false;
}
memory.previousGBAData = data;
memory.previousAdapterData = expectedResponse;
return true;
}
u32 buildCommand(u8 type, u8 length = 0) {
return buildU32(LINK_RAW_WIRELESS_COMMAND_HEADER, buildU16(length, type));
}
u32 transfer(u32 data, bool customAck = true) {
if (!customAck)
wait(LINK_RAW_WIRELESS_TRANSFER_WAIT);
u32 lines = 0;
u32 vCount = REG_VCOUNT;
u32 receivedData = linkSPI->transfer(
data, [this, &lines, &vCount]() { return cmdTimeout(lines, vCount); },
false, customAck);
if (customAck && !acknowledge())
return LINK_SPI_NO_DATA;
return receivedData;
}
u32 transferAndStartClockInversionACK(u32 data) {
u32 lines = 0;
u32 vCount = REG_VCOUNT;
u32 receivedData = linkSPI->transfer(
data, [this, &lines, &vCount]() { return cmdTimeout(lines, vCount); },
false, true);
if (!reverseAcknowledgeStart())
return LINK_SPI_NO_DATA;
return receivedData;
}
bool acknowledge() {
u32 lines = 0;
u32 vCount = REG_VCOUNT;
linkSPI->_setSOLow();
while (!linkSPI->_isSIHigh()) {
if (cmdTimeout(lines, vCount)) {
LRWLOG("! ACK 1 failed. I put SO=LOW,");
LRWLOG("! but SI didn't become HIGH.");
return false;
}
}
linkSPI->_setSOHigh();
while (linkSPI->_isSIHigh()) {
if (cmdTimeout(lines, vCount)) {
LRWLOG("! ACK 2 failed. I put SO=HIGH,");
LRWLOG("! but SI didn't become LOW.");
return false;
}
}
linkSPI->_setSOLow();
return true;
}
bool reverseAcknowledgeStart() {
u32 lines = 0;
u32 vCount = REG_VCOUNT;
linkSPI->_setSOLow();
wait(1);
linkSPI->_setSOHigh();
while (linkSPI->_isSIHigh()) {
if (cmdTimeout(lines, vCount)) {
LRWLOG("! Rev0 failed. I put SO=HIGH,");
LRWLOG("! but SI didn't become LOW.");
return false;
}
}
linkSPI->_setSOLow();
return true;
}
bool reverseAcknowledge(bool isLastPart = false) {
u32 lines = 0;
u32 vCount = REG_VCOUNT;
linkSPI->_setSOLow();
while (linkSPI->_isSIHigh()) {
if (cmdTimeout(lines, vCount)) {
LRWLOG("! RevAck0 failed. I put SO=LOW,");
LRWLOG("! but SI didn't become LOW.");
return false;
}
}
linkSPI->_setSOHigh();
while (!linkSPI->_isSIHigh()) {
if (cmdTimeout(lines, vCount)) {
LRWLOG("! RevAck1 failed. I put SO=HIGH,");
LRWLOG("! but SI didn't become HIGH.");
return false;
}
}
// (normally, this occurs on the next linkSPI->transfer(...) call)
if (isLastPart) {
linkSPI->_setSOLow();
while (linkSPI->_isSIHigh()) {
if (cmdTimeout(lines, vCount)) {
LRWLOG("! RevAck2 failed. I put SO=LOW,");
LRWLOG("! but SI didn't become LOW.");
return false;
}
}
}
return true;
}
bool cmdTimeout(u32& lines, u32& vCount) {
return timeout(LINK_RAW_WIRELESS_CMD_TIMEOUT, lines, vCount);
}
bool timeout(u32 limit, u32& lines, u32& vCount) {
if (REG_VCOUNT != vCount) {
lines += max((int)REG_VCOUNT - (int)vCount, 0);
vCount = REG_VCOUNT;
}
return lines > limit;
}
void wait(u32 verticalLines) {
u32 count = 0;
u32 vCount = REG_VCOUNT;
while (count < verticalLines) {
if (REG_VCOUNT != vCount) {
count++;
vCount = REG_VCOUNT;
}
};
}
void logExpectedButReceived(u32 expected, u32 received) {
LRWLOG("! expected 0x" + toHex(expected));
LRWLOG("! but received 0x" + toHex(received));
}
#ifdef LINK_RAW_WIRELESS_ENABLE_LOGGING
template <typename I>
std::string toHex(I w, size_t hex_len = sizeof(I) << 1) {
static const char* digits = "0123456789ABCDEF";
std::string rc(hex_len, '0');
for (size_t i = 0, j = (hex_len - 1) * 4; i < hex_len; ++i, j -= 4)
rc[i] = digits[(w >> j) & 0x0f];
return rc;
}
#endif
u32 buildU32(u16 msB, u16 lsB) { return (msB << 16) | lsB; }
u16 buildU16(u8 msB, u8 lsB) { return (msB << 8) | lsB; }
u16 msB32(u32 value) { return value >> 16; }
u16 lsB32(u32 value) { return value & 0xffff; }
u8 msB16(u16 value) { return value >> 8; }
u8 lsB16(u16 value) { return value & 0xff; }
};
extern LinkRawWireless* linkRawWireless;
#undef LRWLOG
#endif // LINK_RAW_WIRELESS_H