static int
brl_construct (BrailleDisplay *brl, char **parameters, const char *device) {
if (!isSerialDevice(&device)) {
unsupportedDevice(device);
return 0;
}
if ((serialDevice = serialOpenDevice(device))) {
if (serialRestartDevice(serialDevice, serialBaud)) {
static const unsigned char request[] = {BNO_DESCRIBE};
charactersPerSecond = serialBaud / 10;
if (writePacket(brl, request, sizeof(request)) != -1) {
while (serialAwaitInput(serialDevice, 100)) {
ResponsePacket response;
int size = getPacket(&response);
if (size) {
if (response.data.code == BNI_DESCRIBE) {
statusCells = response.data.values.description.statusCells;
brl->textColumns = response.data.values.description.textCells;
brl->textRows = 1;
brl->keyBindings = "keys";
if ((statusCells == 5) && (brl->textColumns == 30)) {
statusCells -= 2;
brl->textColumns += 2;
}
dataCells = brl->textColumns * brl->textRows;
cellCount = statusCells + dataCells;
makeOutputTable(dotsTable_ISO11548_1);
makeInputTable();
if ((cellBuffer = malloc(cellCount))) {
memset(cellBuffer, 0, cellCount);
statusArea = cellBuffer;
dataArea = statusArea + statusCells;
refreshCells(brl);
persistentKeyboardMode = KBM_NAVIGATE;
temporaryKeyboardMode = persistentKeyboardMode;
persistentRoutingOperation = BRL_BLK_ROUTE;
temporaryRoutingOperation = persistentRoutingOperation;
return 1;
} else {
logSystemError("cell buffer allocation");
}
} else {
logUnexpectedPacket(response.bytes, size);
}
}
}
}
}
serialCloseDevice(serialDevice);
serialDevice = NULL;
}
return 0;
}
static int
brl_readCommand (BrailleDisplay *brl, KeyTableCommandContext context) {
ResponsePacket packet;
int size;
while ((size = getPacket(&packet))) {
switch (packet.data.code) {
case BN_RSP_ROUTE:
enqueueKey(BN_SET_RoutingKeys, packet.data.values.routingKey);
break;
case BN_RSP_DISPLAY:
doVisualDisplay();
break;
default: {
unsigned char set = BN_SET_NavigationKeys;
unsigned char keys = packet.data.values.dotKeys & 0X3F;
unsigned char base = BN_KEY_Dot1;
unsigned char modifier = 0;
switch (packet.data.code) {
case BN_RSP_CHARACTER:
if (keys) break;
case BN_RSP_SPACE:
modifier = BN_KEY_Space;
break;
case BN_RSP_BACKSPACE:
modifier = BN_KEY_Backspace;
break;
case BN_RSP_ENTER:
modifier = BN_KEY_Enter;
break;
case BN_RSP_THUMB:
keys = packet.data.values.thumbKeys & 0X0F;
base = BN_KEY_Previous;
break;
default:
logUnexpectedPacket(packet.bytes, size);
continue;
}
if (modifier) enqueueKeyEvent(set, modifier, 1);
enqueueKeys(keys, set, base);
if (modifier) enqueueKeyEvent(set, modifier, 0);
break;
}
}
}
return (errno == EAGAIN)? EOF: BRL_CMD_RESTARTBRL;
}
int
probeBrailleDisplay (
BrailleDisplay *brl, unsigned int retryLimit,
GioEndpoint *endpoint, int inputTimeout,
BrailleRequestWriter *writeRequest,
BraillePacketReader *readPacket, void *responsePacket, size_t responseSize,
BrailleResponseHandler *handleResponse
) {
unsigned int retryCount = 0;
if (!endpoint) endpoint = brl->gioEndpoint;
while (writeRequest(brl)) {
drainBrailleOutput(brl, 0);
while (gioAwaitInput(endpoint, inputTimeout)) {
size_t size = readPacket(brl, responsePacket, responseSize);
if (!size) break;
{
BrailleResponseResult result = handleResponse(brl, responsePacket, size);
switch (result) {
case BRL_RSP_DONE:
return 1;
case BRL_RSP_UNEXPECTED:
logUnexpectedPacket(responsePacket, size);
case BRL_RSP_CONTINUE:
break;
default:
logMessage(LOG_WARNING, "unimplemented braille response result: %u", result);
case BRL_RSP_FAIL:
return 0;
}
}
}
if (errno != EAGAIN)
#ifdef ETIMEDOUT
if (errno != ETIMEDOUT)
#endif /* ETIMEDOUT */
break;
if (retryCount == retryLimit) break;
retryCount += 1;
}
return 0;
}
static int
nextSerialPacket (BrailleDisplay *brl, unsigned char code, unsigned char *buffer, int size, int wait) {
int length;
if (wait)
if (!awaitBrailleInput(brl, SERIAL_WAIT_TIMEOUT))
return 0;
while ((length = readSerialPacket(brl, buffer, size))) {
if (buffer[0] == code) return length;
logUnexpectedPacket(buffer, length);
}
return 0;
}
static int
nextSerialPacket (unsigned char code, unsigned char *buffer, int size, int wait) {
int length;
if (wait)
if (!gioAwaitInput(gioEndpoint, SERIAL_WAIT_TIMEOUT))
return 0;
while ((length = readSerialPacket(buffer, size))) {
if (buffer[0] == code) return length;
logUnexpectedPacket(buffer, length);
}
return 0;
}
/* for BRL_ROUTING, the code is the ofset to route, starting from 0 */
static int brl_readKey(BrailleDisplay *brl)
{
unsigned char ch, packet[MAXPACKETSIZE];
static int routing = 0;
ssize_t packetSize;
packetSize = brl_readPacket(brl,packet,sizeof(packet));
if (packetSize==0) return EOF;
if ((packet[0]!=0x3c) && (packet[0]!=0x3d) && (packet[0]!=0x23)) {
logUnexpectedPacket(packet, packetSize);
return EOF;
}
ch = packet[1];
if (routing) {
routing=0;
if (ch>=0xc0) return (packet[1]-0xc0) | BRL_VSMSK_ROUTING;
return EOF;
}
if ((ch>=0xc0) && (ch<=0xdf)) return (ch-0xc0) | BRL_VSMSK_FUNCTIONKEY;
if (ch==0x91) {
routing = 1;
return BRL_CMD_NOOP;
}
if ((ch>=0x20) && (ch<=0x9e)) {
switch (ch) {
case 0x80: ch = 0xc7; break;
case 0x81: ch = 0xfc; break;
case 0x82: ch = 0xe9; break;
case 0x83: ch = 0xe2; break;
case 0x84: ch = 0xe4; break;
case 0x85: ch = 0xe0; break;
case 0x87: ch = 0xe7; break;
case 0x88: ch = 0xea; break;
case 0x89: ch = 0xeb; break;
case 0x8a: ch = 0xe8; break;
case 0x8b: ch = 0xef; break;
case 0x8c: ch = 0xee; break;
case 0x8f: ch = 0xc0; break;
case 0x93: ch = 0xf4; break;
case 0x94: ch = 0xf6; break;
case 0x96: ch = 0xfb; break;
case 0x97: ch = 0xf9; break;
case 0x9e: ch = 0x60; break;
}
return ch | BRL_VSMSK_CHAR;
}
return ch | BRL_VSMSK_OTHER;
}
static int
startDisplayMode (BrailleDisplay *brl) {
static const unsigned char data[] = {MM_BLINK_NO, 0};
if (writePacket(brl, MM_CMD_StartDisplayMode, 0, data, sizeof(data))) {
if (gioAwaitInput(brl->gioEndpoint, START_INPUT_TIMEOUT)) {
MM_CommandPacket response;
size_t size = readPacket(brl, &response);
if (size) {
if (response.fields.header.id1 == MM_HEADER_ACK) return 1;
logUnexpectedPacket(response.bytes, size);
}
}
}
return 0;
}
static int
identifyDisplay (BrailleDisplay *brl) {
static const unsigned char identify[] = {'I', CR};
if (writeBytes(brl, identify, sizeof(identify))) {
if (serialAwaitInput(serialDevice, 1000)) {
unsigned char identity[0X100];
size_t length;
if (readBytes(identity, sizeof(identity), &length)) {
static const unsigned char prefix[] = {'b', 'r', 'a', 'u', 'd', 'i', ' '};
if ((length >= sizeof(prefix)) &&
(memcmp(identity, prefix, sizeof(prefix)) == 0)) {
const unsigned char *bytes = memchr(identity, ',', length);
if (bytes) {
int count = length - (bytes - identity);
int cells;
++bytes, --count;
skipCharacter(' ', &bytes, &count);
if (interpretNumber(&cells, &bytes, &count)) {
if (!count) {
logMessage(LOG_INFO, "Detected: %.*s", (int)length, identity);
brl->textColumns = cells;
brl->textRows = 1;
return 1;
}
}
}
}
logUnexpectedPacket(identity, length);
}
}
}
return 0;
}
static int
brl_readCommand (BrailleDisplay *brl, KeyTableCommandContext context) {
unsigned char packet[MAXIMUM_RESPONSE_SIZE];
size_t size;
while ((size = readPacket(brl, packet, sizeof(packet)))) {
switch (packet[0]) {
case 0XFD:
switch (packet[1]) {
case 0X2F:
continue;
default:
break;
}
break;
case 0XFC: {
unsigned int key = packet[1];
if ((key >= NP_KEY_ROUTING_MIN) && (key <= NP_KEY_ROUTING_MAX)) {
enqueueKey(brl, NP_GRP_RoutingKeys, (key - NP_KEY_ROUTING_MIN));
continue;
} else {
int press = !!(key & NP_KEY_NAVIGATION_PRESS);
if (press) key &= ~NP_KEY_NAVIGATION_PRESS;
enqueueKeyEvent(brl, NP_GRP_NavigationKeys, key, press);
continue;
}
break;
}
}
logUnexpectedPacket(packet, size);
}
return (errno == EAGAIN)? EOF: BRL_CMD_RESTARTBRL;
}
static int
brl_readCommand (BrailleDisplay *brl, KeyTableCommandContext context) {
InputPacket packet;
int length;
if (context == KTB_CTX_WAITING) return BRL_CMD_NOOP;
if (writeFunction) return EOF;
while (*initialCommand != EOF) enqueueCommand(*initialCommand++);
while ((length = readPacket(brl, &packet))) {
if ((packet.data.type >= IPT_MINIMUM_LINE) &&
(packet.data.type <= IPT_MAXIMUM_LINE)) {
enqueueCommand(BRL_CMD_BLK(GOTOLINE) | BRL_FLG_MOTION_TOLEFT | (packet.data.type - IPT_MINIMUM_LINE));
writeFunction = writeLine;
return EOF;
}
switch (packet.data.type) {
case IPT_SEARCH_ATTRIBUTE:
case IPT_CURRENT_LINE:
enqueueCommand(BRL_CMD_HOME);
enqueueCommand(BRL_CMD_LNBEG);
writeFunction = writeLine;
return EOF;
case IPT_CURRENT_LOCATION:
writeFunction = writeLocation;
return EOF;
default:
logUnexpectedPacket(&packet, length);
break;
}
}
return (errno == EAGAIN)? EOF: BRL_CMD_RESTARTBRL;
}
static int
brl_readCommand (BrailleDisplay *brl, KeyTableCommandContext context) {
while (1) {
unsigned char packet[3];
int size = readPacket(brl, packet, sizeof(packet));
if (size == 0) break;
if (size < 0) return BRL_CMD_RESTARTBRL;
switch (packet[1]) {
default:
break;
case 1:
return BRL_BLK_PASSDOTS | translateInputCell(packet[2]);
case 2: {
unsigned char column = packet[2];
if (column && (column <= brl->textColumns)) return BRL_BLK_ROUTE + (column - 1);
break;
}
case 3:
switch (packet[2]) {
default:
break;
// left rear: two columns, one row
case 0X02: // ESC
return BRL_CMD_LEARN;
case 0X01: // M
return BRL_CMD_PREFMENU;
// left middle: cross
case 0X06: // up
return BRL_CMD_LNUP;
case 0X03: // left
return BRL_CMD_FWINLT;
case 0X05: // right
return BRL_CMD_FWINRT;
case 0X04: // down
return BRL_CMD_LNDN;
// left front: two columns, three rows
case 0X09: // ins
return BRL_CMD_RETURN;
case 0X0A: // E
return BRL_CMD_TOP;
case 0X0B: // supp
return BRL_CMD_CSRTRK;
case 0X0C: // L
return BRL_CMD_BOT;
case 0X07: // extra 1 (40s only)
return BRL_CMD_CHRLT;
case 0X08: // extra 2 (40s only)
return BRL_CMD_CHRRT;
case 0x0E: // left thumb
return BRL_BLK_PASSKEY + BRL_KEY_BACKSPACE;
case 0x0F: // right thumb
return BRL_BLK_PASSDOTS;
case 0x3F: // both thumbs
return BRL_BLK_PASSKEY + BRL_KEY_ENTER;
case 0X29: // key under dot 7
return BRL_BLK_PASSKEY + BRL_KEY_ESCAPE;
case 0X2A: // key under dot 8
return BRL_BLK_PASSKEY + BRL_KEY_TAB;
// right rear: one column, one row
case 0X19: // extra 3 (40s only)
return BRL_CMD_INFO;
// right middle: one column, two rows
case 0X1B: // extra 4 (40s only)
return BRL_CMD_PRDIFLN;
case 0X1A: // extra 5 (40s only)
return BRL_CMD_NXDIFLN;
// right front: one column, four rows
case 0X2B: // slash (40s only)
return BRL_CMD_FREEZE;
case 0X2C: // asterisk (40s only)
return BRL_CMD_DISPMD;
case 0X2D: // minus (40s only)
return BRL_CMD_ATTRVIS;
case 0X2E: // plus (40s only)
return BRL_CMD_CSRVIS;
// first (top) row of numeric pad
case 0X37: // seven (40s only)
return BRL_BLK_PASSKEY + BRL_KEY_HOME;
case 0X38: // eight (40s only)
return BRL_BLK_PASSKEY + BRL_KEY_CURSOR_UP;
case 0X39: // nine (40s only)
return BRL_BLK_PASSKEY + BRL_KEY_PAGE_UP;
// second row of numeric pad
case 0X34: // four (40s only)
return BRL_BLK_PASSKEY + BRL_KEY_CURSOR_LEFT;
case 0X35: // five (40s only)
return BRL_CMD_CSRJMP_VERT;
case 0X36: // six (40s only)
return BRL_BLK_PASSKEY + BRL_KEY_CURSOR_RIGHT;
// third row of numeric pad
case 0X31: // one (40s only)
return BRL_BLK_PASSKEY + BRL_KEY_END;
case 0X32: // two (40s only)
return BRL_BLK_PASSKEY + BRL_KEY_CURSOR_DOWN;
case 0X33: // three (40s only)
return BRL_BLK_PASSKEY + BRL_KEY_PAGE_DOWN;
// fourth (bottom) row of numeric pad
case 0X28: // verr num (40s only)
return BRL_CMD_SIXDOTS;
case 0X30: // zero (40s only)
return BRL_BLK_PASSKEY + BRL_KEY_INSERT;
case 0X2F: // supp (40s only)
return BRL_BLK_PASSKEY + BRL_KEY_DELETE;
}
break;
/* When data is written to the display it acknowledges with:
* 0X00 0X04 0Xxx
* where xx is the number of bytes written.
*/
case 4:
continue;
}
logUnexpectedPacket(packet, size);
}
return EOF;
}
static int
brl_readCommand (BrailleDisplay *brl, KeyTableCommandContext context) {
ResponsePacket packet;
int size;
while ((size = getPacket(&packet))) {
int (*handler)(BrailleDisplay *, unsigned char, KeyTableCommandContext);
unsigned char data;
switch (packet.data.code) {
case BNI_CHARACTER:
handler = interpretCharacter;
data = packet.data.values.dotKeys;
break;
case BNI_SPACE:
handler = interpretSpaceChord;
data = packet.data.values.dotKeys;
break;
case BNI_BACKSPACE:
handler = interpretBackspaceChord;
data = packet.data.values.dotKeys;
break;
case BNI_ENTER:
handler = interpretEnterChord;
data = packet.data.values.dotKeys;
break;
case BNI_THUMB:
handler = interpretThumbKeys;
data = packet.data.values.thumbKeys;
break;
case BNI_ROUTE:
handler = interpretRoutingKey;
data = packet.data.values.routingKey;
break;
case BNI_DISPLAY:
handler = visualDisplay;
data = 0;
break;
default:
logUnexpectedPacket(packet.bytes, size);
continue;
}
currentKeyboardMode = temporaryKeyboardMode;
temporaryKeyboardMode = persistentKeyboardMode;
currentRoutingOperation = temporaryRoutingOperation;
temporaryRoutingOperation = persistentRoutingOperation;
return handler(brl, data, context);
}
return (errno == EAGAIN)? EOF: BRL_CMD_RESTARTBRL;
}
static int
brl_readCommand (BrailleDisplay *brl, KeyTableCommandContext context) {
unsigned char buffer[0X100];
size_t length;
while (readBytes(buffer, sizeof(buffer), &length)) {
const unsigned char *bytes = buffer;
int count = length;
if (count > 0) {
unsigned char category = *bytes++;
--count;
switch (category) {
case 'F': {
int keys;
writeAcknowledgement(brl);
if (interpretNumber(&keys, &bytes, &count)) {
if (!count) {
switch (keys) {
case 1: return BRL_CMD_TOP_LEFT;
case 2: return BRL_CMD_FWINLT;
case 3: return BRL_CMD_LNDN;
case 4: return BRL_CMD_LNUP;
case 5: return BRL_CMD_FWINRT;
case 6: return BRL_CMD_BOT_LEFT;
case 23: return BRL_CMD_LNBEG;
case 56: return BRL_CMD_LNEND;
case 14: return BRL_CMD_CSRVIS;
case 25: return BRL_CMD_DISPMD;
case 26: return BRL_CMD_INFO;
case 36: return BRL_CMD_HOME;
}
}
}
break;
}
case 'K': {
int key;
writeAcknowledgement(brl);
if (interpretNumber(&key, &bytes, &count)) {
if (!count) {
if ((key > 0) && (key <= brl->textColumns)) return BRL_BLK_ROUTE + (key - 1);
}
}
break;
}
}
}
logUnexpectedPacket(buffer, length);
}
if (errno == EAGAIN) return EOF;
return BRL_CMD_RESTARTBRL;
}
