Alexander Lang / 4dGENIE_2

An forked version of Christian B's excellent library for controlling the 4D systems touch screen display

Dependents:   Genie_Test_Temperature

Fork of 4dGENIE by christian b

mbed_genie.cpp@2:f283764fe9b7, 2014-02-23 (annotated)

Committer:
chris215
Date:
Sun Feb 23 01:34:05 2014 +0000
Revision:
2:f283764fe9b7
Parent:
1:95e0e194a412
Child:
3:11c49c49cd1a
Completed conversion to a class (untested)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
chris215 0:d2ed5a44c802 1
chris215 0:d2ed5a44c802 2 #include "mbed.h"
chris215 0:d2ed5a44c802 3 #include "mbed_genie.h"
chris215 0:d2ed5a44c802 4
chris215 0:d2ed5a44c802 5 Serial pc(USBTX,USBRX);
chris215 0:d2ed5a44c802 6
chris215 2:f283764fe9b7 7 Mbed4dGenie::Mbed4dGenie(PinName TxPin,PinName RxPin) : _screen(TxPin,RxPin)
chris215 2:f283764fe9b7 8 {
chris215 2:f283764fe9b7 9 _genieLinkStates[4] = GENIE_LINK_IDLE;
chris215 2:f283764fe9b7 10 _genieLinkStates[3] = GENIE_LINK_IDLE;
chris215 2:f283764fe9b7 11 _genieLinkStates[2] = GENIE_LINK_IDLE;
chris215 2:f283764fe9b7 12 _genieLinkStates[1] = GENIE_LINK_IDLE;
chris215 2:f283764fe9b7 13 _genieLinkStates[0] = GENIE_LINK_IDLE;
chris215 2:f283764fe9b7 14 _genieLinkState = &_genieLinkStates[0];
chris215 2:f283764fe9b7 15
chris215 2:f283764fe9b7 16 _genieTimeout = TIMEOUT_PERIOD;
chris215 2:f283764fe9b7 17 _genieError = ERROR_NONE;
chris215 2:f283764fe9b7 18 rxframe_count = 0;
chris215 2:f283764fe9b7 19
chris215 2:f283764fe9b7 20 _genieUserHandler = NULL;
chris215 2:f283764fe9b7 21 _screen.attach(this,&Mbed4dGenie::RxIrqHandler,Serial::RxIrq);
chris215 2:f283764fe9b7 22 _t.start();
chris215 2:f283764fe9b7 23 }
chris215 2:f283764fe9b7 24 void Mbed4dGenie::genieAttachEventHandler(genieUserEventHandlerPtr handler)
chris215 2:f283764fe9b7 25 {
chris215 2:f283764fe9b7 26 _genieUserHandler = handler;
chris215 2:f283764fe9b7 27 }
chris215 2:f283764fe9b7 28 void Mbed4dGenie::RxIrqHandler(void)
chris215 2:f283764fe9b7 29 {
chris215 2:f283764fe9b7 30 do
chris215 2:f283764fe9b7 31 {
chris215 2:f283764fe9b7 32 //genieDoEvents();
chris215 2:f283764fe9b7 33 }
chris215 2:f283764fe9b7 34 while(_screen.readable ());
chris215 2:f283764fe9b7 35 }
chris215 2:f283764fe9b7 36 //////////////////////// _genieGetchar //////////////////////////
chris215 2:f283764fe9b7 37 //
chris215 2:f283764fe9b7 38 // Get a character from the selected Genie serial port
chris215 2:f283764fe9b7 39 //
chris215 2:f283764fe9b7 40 // Returns: ERROR_NOHANDLER if an Rx handler has not
chris215 2:f283764fe9b7 41 // been defined
chris215 2:f283764fe9b7 42 // ERROR_NOCHAR if no bytes have beeb received
chris215 2:f283764fe9b7 43 // The char if there was one to get
chris215 2:f283764fe9b7 44 // Sets: _genieError with any errors encountered
chris215 2:f283764fe9b7 45 //
chris215 2:f283764fe9b7 46 uint8_t Mbed4dGenie::_genieGetchar() {
chris215 2:f283764fe9b7 47
chris215 2:f283764fe9b7 48 _genieError = ERROR_NONE;
chris215 2:f283764fe9b7 49
chris215 2:f283764fe9b7 50 return (_screen.getc());
chris215 2:f283764fe9b7 51 }
chris215 2:f283764fe9b7 52 ///////////////////// _genieSetLinkState ////////////////////////
chris215 2:f283764fe9b7 53 //
chris215 2:f283764fe9b7 54 // Set the logical state of the link to the display.
chris215 2:f283764fe9b7 55 //
chris215 2:f283764fe9b7 56 // Parms: uint16_t newstate, a value to be written to the
chris215 2:f283764fe9b7 57 // link's _genieLinkState variable. Valid values are
chris215 2:f283764fe9b7 58 // GENIE_LINK_IDLE 0
chris215 2:f283764fe9b7 59 // GENIE_LINK_WFAN 1 // waiting for Ack or Nak
chris215 2:f283764fe9b7 60 // GENIE_LINK_WF_RXREPORT 2 // waiting for a report frame
chris215 2:f283764fe9b7 61 // GENIE_LINK_RXREPORT 3 // receiving a report frame
chris215 2:f283764fe9b7 62 // GENIE_LINK_RXEVENT 4 // receiving an event frame
chris215 2:f283764fe9b7 63 // GENIE_LINK_SHDN 5
chris215 2:f283764fe9b7 64 //
chris215 2:f283764fe9b7 65 void Mbed4dGenie::_genieSetLinkState (uint16_t newstate) {
chris215 2:f283764fe9b7 66
chris215 2:f283764fe9b7 67 *_genieLinkState = newstate;
chris215 0:d2ed5a44c802 68
chris215 0:d2ed5a44c802 69
chris215 2:f283764fe9b7 70 if (newstate == GENIE_LINK_RXREPORT || \
chris215 2:f283764fe9b7 71 newstate == GENIE_LINK_RXEVENT)
chris215 2:f283764fe9b7 72 rxframe_count = 0;
chris215 2:f283764fe9b7 73 }
chris215 2:f283764fe9b7 74
chris215 2:f283764fe9b7 75
chris215 2:f283764fe9b7 76 /////////////////////// _genieGetLinkState //////////////////////
chris215 2:f283764fe9b7 77 //
chris215 2:f283764fe9b7 78 // Get the current logical state of the link to the display.
chris215 2:f283764fe9b7 79 //
chris215 2:f283764fe9b7 80 uint16_t Mbed4dGenie::_genieGetLinkState (void) {
chris215 2:f283764fe9b7 81 return *_genieLinkState;
chris215 2:f283764fe9b7 82 }
chris215 2:f283764fe9b7 83
chris215 2:f283764fe9b7 84 /////////////////////// _geniePutchar ///////////////////////////
chris215 2:f283764fe9b7 85 //
chris215 2:f283764fe9b7 86 // Output the supplied character to the Genie display over
chris215 2:f283764fe9b7 87 // the selected serial port
chris215 2:f283764fe9b7 88 //
chris215 2:f283764fe9b7 89 void Mbed4dGenie::_geniePutchar (uint8_t c) {
chris215 2:f283764fe9b7 90 // if (screen != NULL)
chris215 2:f283764fe9b7 91 _screen.putc(c);
chris215 2:f283764fe9b7 92 }
chris215 2:f283764fe9b7 93 ////////////////////// _genieEnqueueEvent ///////////////////
chris215 2:f283764fe9b7 94 //
chris215 2:f283764fe9b7 95 // Copy the bytes from a buffer supplied by the caller
chris215 2:f283764fe9b7 96 // to the input queue
chris215 2:f283764fe9b7 97 //
chris215 2:f283764fe9b7 98 // Parms: uint8_t * data, a pointer to the user's data
chris215 0:d2ed5a44c802 99 //
chris215 2:f283764fe9b7 100 // Returns: TRUE if there was an empty location in the queue
chris215 2:f283764fe9b7 101 // to copy the data into
chris215 2:f283764fe9b7 102 // FALSE if not
chris215 2:f283764fe9b7 103 // Sets: ERROR_REPLY_OVR if there was no room in the queue
chris215 2:f283764fe9b7 104 //
chris215 2:f283764fe9b7 105 bool Mbed4dGenie::_genieEnqueueEvent (uint8_t * data) {
chris215 2:f283764fe9b7 106
chris215 0:d2ed5a44c802 107
chris215 2:f283764fe9b7 108 if (_genieEventQueue.n_events < MAX_GENIE_EVENTS-2) {
chris215 2:f283764fe9b7 109 memcpy (&_genieEventQueue.frames[_genieEventQueue.wr_index], data,
chris215 2:f283764fe9b7 110 GENIE_FRAME_SIZE);
chris215 2:f283764fe9b7 111 _genieEventQueue.wr_index++;
chris215 2:f283764fe9b7 112 _genieEventQueue.wr_index &= MAX_GENIE_EVENTS -1;
chris215 2:f283764fe9b7 113 _genieEventQueue.n_events++;
chris215 2:f283764fe9b7 114 return TRUE;
chris215 2:f283764fe9b7 115 } else {
chris215 2:f283764fe9b7 116 _genieError = ERROR_REPLY_OVR;
chris215 2:f283764fe9b7 117 _handleError();
chris215 2:f283764fe9b7 118 return FALSE;
chris215 2:f283764fe9b7 119 }
chris215 2:f283764fe9b7 120 }
chris215 2:f283764fe9b7 121 ////////////////////// genieDequeueEvent ///////////////////
chris215 0:d2ed5a44c802 122 //
chris215 2:f283764fe9b7 123 // Copy the bytes from a queued input event to a buffer supplied
chris215 2:f283764fe9b7 124 // by the caller.
chris215 2:f283764fe9b7 125 //
chris215 2:f283764fe9b7 126 // Parms: genieFrame * buff, a pointer to the user's buffer
chris215 2:f283764fe9b7 127 //
chris215 2:f283764fe9b7 128 // Returns: TRUE if there was an event to copy
chris215 2:f283764fe9b7 129 // FALSE if not
chris215 2:f283764fe9b7 130 //
chris215 2:f283764fe9b7 131 bool Mbed4dGenie::genieDequeueEvent(genieFrame * buff) {
chris215 0:d2ed5a44c802 132
chris215 0:d2ed5a44c802 133
chris215 2:f283764fe9b7 134 if (_genieEventQueue.n_events > 0) {
chris215 2:f283764fe9b7 135 memcpy (buff, &_genieEventQueue.frames[_genieEventQueue.rd_index],
chris215 2:f283764fe9b7 136 GENIE_FRAME_SIZE);
chris215 2:f283764fe9b7 137 _genieEventQueue.rd_index++;
chris215 2:f283764fe9b7 138 _genieEventQueue.rd_index &= MAX_GENIE_EVENTS -1;
chris215 2:f283764fe9b7 139 _genieEventQueue.n_events--;
chris215 2:f283764fe9b7 140 return TRUE;
chris215 2:f283764fe9b7 141 }
chris215 2:f283764fe9b7 142 return FALSE;
chris215 2:f283764fe9b7 143 }
chris215 2:f283764fe9b7 144 ////////////////////// _genieWaitForIdle ////////////////////////
chris215 2:f283764fe9b7 145 //
chris215 2:f283764fe9b7 146 // Wait for the link to become idle or for the timeout period,
chris215 2:f283764fe9b7 147 // whichever comes first.
chris215 0:d2ed5a44c802 148 //
chris215 2:f283764fe9b7 149 void Mbed4dGenie::_genieWaitForIdle (void) {
chris215 2:f283764fe9b7 150 uint16_t do_event_result;
chris215 2:f283764fe9b7 151 long timeout = _t.read_ms() + _genieTimeout;
chris215 2:f283764fe9b7 152
chris215 2:f283764fe9b7 153 for ( ; _t.read_ms() < timeout;) {
chris215 2:f283764fe9b7 154
chris215 2:f283764fe9b7 155
chris215 2:f283764fe9b7 156 do_event_result = genieDoEvents();
chris215 2:f283764fe9b7 157 // if there was a character received from the
chris215 2:f283764fe9b7 158 // display restart the timeout because doEvents
chris215 2:f283764fe9b7 159 // is in the process of receiving something
chris215 2:f283764fe9b7 160 if (do_event_result == GENIE_EVENT_RXCHAR) {
chris215 2:f283764fe9b7 161 timeout = _t.read_ms() + _genieTimeout;
chris215 2:f283764fe9b7 162 return;
chris215 2:f283764fe9b7 163 }
chris215 2:f283764fe9b7 164
chris215 2:f283764fe9b7 165 if (_genieGetLinkState() == GENIE_LINK_IDLE) {
chris215 2:f283764fe9b7 166 return;
chris215 2:f283764fe9b7 167 }
chris215 2:f283764fe9b7 168 }
chris215 2:f283764fe9b7 169 _genieError = ERROR_TIMEOUT;
chris215 2:f283764fe9b7 170 _handleError();
chris215 2:f283764fe9b7 171 return;
chris215 2:f283764fe9b7 172 }
chris215 2:f283764fe9b7 173 ///////////////////////// genieWriteObject //////////////////////
chris215 0:d2ed5a44c802 174 //
chris215 2:f283764fe9b7 175 // Write data to an object on the display
chris215 0:d2ed5a44c802 176 //
chris215 2:f283764fe9b7 177 uint16_t Mbed4dGenie::genieWriteObject (uint16_t object, uint16_t index, uint16_t data)
chris215 2:f283764fe9b7 178 {
chris215 2:f283764fe9b7 179 uint16_t msb, lsb ;
chris215 2:f283764fe9b7 180 uint8_t checksum ;
chris215 2:f283764fe9b7 181
chris215 2:f283764fe9b7 182
chris215 2:f283764fe9b7 183 _genieWaitForIdle();
chris215 2:f283764fe9b7 184
chris215 2:f283764fe9b7 185
chris215 2:f283764fe9b7 186 lsb = data&0xFF;
chris215 2:f283764fe9b7 187 msb = (data>>8) & 0xFF;
chris215 2:f283764fe9b7 188
chris215 2:f283764fe9b7 189
chris215 2:f283764fe9b7 190 _genieError = ERROR_NONE;
chris215 2:f283764fe9b7 191
chris215 2:f283764fe9b7 192
chris215 2:f283764fe9b7 193 _geniePutchar(GENIE_WRITE_OBJ) ; checksum = GENIE_WRITE_OBJ ;
chris215 2:f283764fe9b7 194 _geniePutchar(object) ; checksum ^= object ;
chris215 2:f283764fe9b7 195 _geniePutchar(index) ; checksum ^= index ;
chris215 2:f283764fe9b7 196 _geniePutchar(msb) ; checksum ^= msb;
chris215 2:f283764fe9b7 197 _geniePutchar(lsb) ; checksum ^= lsb;
chris215 2:f283764fe9b7 198 _geniePutchar(checksum) ;
chris215 0:d2ed5a44c802 199
chris215 0:d2ed5a44c802 200
chris215 2:f283764fe9b7 201 _geniePushLinkState(GENIE_LINK_WFAN);
chris215 2:f283764fe9b7 202 return GENIE_EVENT_NONE;
chris215 2:f283764fe9b7 203 }
chris215 2:f283764fe9b7 204 /////////////////////// genieWriteContrast //////////////////////
chris215 2:f283764fe9b7 205 //
chris215 2:f283764fe9b7 206 // Alter the display contrast (backlight)
chris215 2:f283764fe9b7 207 //
chris215 2:f283764fe9b7 208 // Parms: uint8_t value: The required contrast setting, only
chris215 2:f283764fe9b7 209 // values from 0 to 15 are valid. 0 or 1 for most displays
chris215 2:f283764fe9b7 210 // and 0 to 15 for the uLCD-43
chris215 2:f283764fe9b7 211 //
chris215 2:f283764fe9b7 212 void Mbed4dGenie::genieWriteContrast (uint16_t value) {
chris215 2:f283764fe9b7 213 unsigned int checksum ;
chris215 2:f283764fe9b7 214
chris215 2:f283764fe9b7 215
chris215 2:f283764fe9b7 216 _genieWaitForIdle();
chris215 0:d2ed5a44c802 217
chris215 0:d2ed5a44c802 218
chris215 2:f283764fe9b7 219 _geniePutchar(GENIE_WRITE_CONTRAST) ; checksum = GENIE_WRITE_CONTRAST ;
chris215 2:f283764fe9b7 220 _geniePutchar(value) ; checksum ^= value ;
chris215 2:f283764fe9b7 221 _geniePutchar(checksum) ;
chris215 2:f283764fe9b7 222
chris215 2:f283764fe9b7 223
chris215 2:f283764fe9b7 224 _geniePushLinkState(GENIE_LINK_WFAN);
chris215 2:f283764fe9b7 225
chris215 2:f283764fe9b7 226
chris215 2:f283764fe9b7 227 }
chris215 2:f283764fe9b7 228 //////////////////////// _genieWriteStrX ///////////////////////
chris215 2:f283764fe9b7 229 //
chris215 2:f283764fe9b7 230 // Non-user function used by genieWriteStr() and genieWriteStrU()
chris215 2:f283764fe9b7 231 //
chris215 2:f283764fe9b7 232 int Mbed4dGenie::_genieWriteStrX (uint16_t code, uint16_t index, char *string)
chris215 2:f283764fe9b7 233 {
chris215 2:f283764fe9b7 234 char *p ;
chris215 2:f283764fe9b7 235 unsigned int checksum ;
chris215 2:f283764fe9b7 236 int len = strlen (string) ;
chris215 0:d2ed5a44c802 237
chris215 0:d2ed5a44c802 238
chris215 2:f283764fe9b7 239 if (len > 255)
chris215 2:f283764fe9b7 240 return -1 ;
chris215 2:f283764fe9b7 241
chris215 2:f283764fe9b7 242
chris215 2:f283764fe9b7 243 _genieWaitForIdle();
chris215 2:f283764fe9b7 244
chris215 2:f283764fe9b7 245
chris215 2:f283764fe9b7 246 _geniePutchar(code) ; checksum = code ;
chris215 2:f283764fe9b7 247 _geniePutchar(index) ; checksum ^= index ;
chris215 2:f283764fe9b7 248 _geniePutchar((unsigned char)len) ; checksum ^= len ;
chris215 2:f283764fe9b7 249 for (p = string ; *p ; ++p) {
chris215 2:f283764fe9b7 250 _geniePutchar (*p) ;
chris215 2:f283764fe9b7 251 checksum ^= *p ;
chris215 2:f283764fe9b7 252 }
chris215 2:f283764fe9b7 253 _geniePutchar(checksum) ;
chris215 2:f283764fe9b7 254
chris215 2:f283764fe9b7 255
chris215 2:f283764fe9b7 256 _geniePushLinkState(GENIE_LINK_WFAN);
chris215 0:d2ed5a44c802 257
chris215 0:d2ed5a44c802 258
chris215 2:f283764fe9b7 259 return 0 ;
chris215 2:f283764fe9b7 260 }
chris215 2:f283764fe9b7 261 /////////////////////// genieWriteStr ////////////////////////
chris215 2:f283764fe9b7 262 //
chris215 2:f283764fe9b7 263 // Write a string to the display (ASCII)
chris215 2:f283764fe9b7 264 //
chris215 2:f283764fe9b7 265 uint16_t Mbed4dGenie::genieWriteStr (uint16_t index, char *string) {
chris215 2:f283764fe9b7 266
chris215 2:f283764fe9b7 267 return _genieWriteStrX (GENIE_WRITE_STR, index, string);
chris215 2:f283764fe9b7 268 }
chris215 2:f283764fe9b7 269 /////////////////////// genieWriteStrU ////////////////////////
chris215 2:f283764fe9b7 270 //
chris215 2:f283764fe9b7 271 // Write a string to the display (Unicode)
chris215 2:f283764fe9b7 272 //
chris215 2:f283764fe9b7 273 uint16_t Mbed4dGenie::genieWriteStrU (uint16_t index, char *string) {
chris215 0:d2ed5a44c802 274
chris215 2:f283764fe9b7 275 return _genieWriteStrX (GENIE_WRITE_STRU, index, string);
chris215 0:d2ed5a44c802 276
chris215 2:f283764fe9b7 277 }
chris215 0:d2ed5a44c802 278 //////////////////////////////////////////////////////////////
chris215 0:d2ed5a44c802 279 // Number of fatal errors encountered
chris215 1:95e0e194a412 280 //static int _genieFatalErrors = 0;
chris215 0:d2ed5a44c802 281 ////////////////////// genieGetEventData ////////////////////////
chris215 0:d2ed5a44c802 282 //
chris215 0:d2ed5a44c802 283 // Returns the LSB and MSB of the event's data combined into
chris215 0:d2ed5a44c802 284 // a single uint16
chris215 0:d2ed5a44c802 285 //
chris215 0:d2ed5a44c802 286 // The data is transmitted from the display in big-endian format
chris215 0:d2ed5a44c802 287 // and stored the same so the user can't just access it as an int
chris215 0:d2ed5a44c802 288 // directly from the structure.
chris215 0:d2ed5a44c802 289 //
chris215 2:f283764fe9b7 290 uint16_t Mbed4dGenie::genieGetEventData (genieFrame * e) {
chris215 0:d2ed5a44c802 291 return (e->reportObject.data_msb << 8) + e->reportObject.data_lsb;
chris215 0:d2ed5a44c802 292 }
chris215 0:d2ed5a44c802 293
chris215 0:d2ed5a44c802 294
chris215 0:d2ed5a44c802 295
chris215 0:d2ed5a44c802 296
chris215 0:d2ed5a44c802 297 //////////////////////// genieEventIs ///////////////////////////
chris215 0:d2ed5a44c802 298 //
chris215 0:d2ed5a44c802 299 // Compares the cmd, object and index fields of the event's
chris215 0:d2ed5a44c802 300 // structure.
chris215 0:d2ed5a44c802 301 //
chris215 0:d2ed5a44c802 302 // Returns: TRUE if all the fields match the caller's parms
chris215 0:d2ed5a44c802 303 // FALSE if any of them don't
chris215 0:d2ed5a44c802 304 //
chris215 2:f283764fe9b7 305 bool Mbed4dGenie::genieEventIs(genieFrame * e, uint8_t cmd, uint8_t object, uint8_t index) {
chris215 0:d2ed5a44c802 306
chris215 0:d2ed5a44c802 307
chris215 0:d2ed5a44c802 308 return (e->reportObject.cmd == cmd &&
chris215 0:d2ed5a44c802 309 e->reportObject.object == object &&
chris215 0:d2ed5a44c802 310 e->reportObject.index == index);
chris215 0:d2ed5a44c802 311
chris215 0:d2ed5a44c802 312
chris215 0:d2ed5a44c802 313 }
chris215 0:d2ed5a44c802 314
chris215 0:d2ed5a44c802 315 ////////////////////// _geniePushLinkState //////////////////////
chris215 0:d2ed5a44c802 316 //
chris215 0:d2ed5a44c802 317 // Push a link state onto a FILO stack
chris215 0:d2ed5a44c802 318 //
chris215 2:f283764fe9b7 319 void Mbed4dGenie::_geniePushLinkState (uint8_t newstate) {
chris215 0:d2ed5a44c802 320
chris215 0:d2ed5a44c802 321
chris215 0:d2ed5a44c802 322 _genieLinkState++;
chris215 0:d2ed5a44c802 323 _genieSetLinkState(newstate);
chris215 0:d2ed5a44c802 324
chris215 0:d2ed5a44c802 325
chris215 0:d2ed5a44c802 326 }
chris215 0:d2ed5a44c802 327
chris215 0:d2ed5a44c802 328
chris215 0:d2ed5a44c802 329 ////////////////////// _geniePopLinkState //////////////////////
chris215 0:d2ed5a44c802 330 //
chris215 0:d2ed5a44c802 331 // Pop a link state from a FILO stack
chris215 0:d2ed5a44c802 332 //
chris215 2:f283764fe9b7 333 void Mbed4dGenie::_geniePopLinkState (void) {
chris215 0:d2ed5a44c802 334 if (_genieLinkState > &_genieLinkStates[0]) {
chris215 0:d2ed5a44c802 335 *_genieLinkState = 0xFF;
chris215 0:d2ed5a44c802 336 _genieLinkState--;
chris215 0:d2ed5a44c802 337 }
chris215 0:d2ed5a44c802 338 }
chris215 0:d2ed5a44c802 339
chris215 0:d2ed5a44c802 340 ///////////////// _genieFlushSerialInput ///////////////////
chris215 0:d2ed5a44c802 341 //
chris215 0:d2ed5a44c802 342 // Removes and discards all characters from the currently
chris215 0:d2ed5a44c802 343 // used serial port's Rx buffer.
chris215 0:d2ed5a44c802 344 //
chris215 2:f283764fe9b7 345 void Mbed4dGenie::_genieFlushSerialInput(void) {
chris215 0:d2ed5a44c802 346 do {
chris215 0:d2ed5a44c802 347 _genieGetchar();
chris215 0:d2ed5a44c802 348 } while (_genieError != ERROR_NOCHAR);
chris215 0:d2ed5a44c802 349 }
chris215 0:d2ed5a44c802 350
chris215 0:d2ed5a44c802 351 ///////////////////////// _handleError /////////////////////////
chris215 0:d2ed5a44c802 352 //
chris215 0:d2ed5a44c802 353 // So far really just a debugging aid, but can be enhanced to
chris215 0:d2ed5a44c802 354 // help recover from errors.
chris215 0:d2ed5a44c802 355 //
chris215 2:f283764fe9b7 356 void Mbed4dGenie::_handleError (void) {
chris215 0:d2ed5a44c802 357 }
chris215 0:d2ed5a44c802 358
chris215 0:d2ed5a44c802 359
chris215 0:d2ed5a44c802 360
chris215 0:d2ed5a44c802 361
chris215 0:d2ed5a44c802 362 ////////////////////// _genieFlushEventQueue ////////////////////
chris215 0:d2ed5a44c802 363 //
chris215 0:d2ed5a44c802 364 // Reset all the event queue variables and start from scratch.
chris215 0:d2ed5a44c802 365 //
chris215 2:f283764fe9b7 366 void Mbed4dGenie::_genieFlushEventQueue(void) {
chris215 0:d2ed5a44c802 367 _genieEventQueue.rd_index = 0;
chris215 0:d2ed5a44c802 368 _genieEventQueue.wr_index = 0;
chris215 0:d2ed5a44c802 369 _genieEventQueue.n_events = 0;
chris215 0:d2ed5a44c802 370 }
chris215 2:f283764fe9b7 371 bool Mbed4dGenie::GenieReadable(void){
chris215 2:f283764fe9b7 372 if (_screen.readable())
chris215 0:d2ed5a44c802 373 {
chris215 0:d2ed5a44c802 374 return TRUE;
chris215 0:d2ed5a44c802 375 }
chris215 0:d2ed5a44c802 376 else
chris215 0:d2ed5a44c802 377 {
chris215 0:d2ed5a44c802 378 return FALSE;
chris215 0:d2ed5a44c802 379 }
chris215 0:d2ed5a44c802 380 }
chris215 0:d2ed5a44c802 381 ///////////////////////// genieDoEvents /////////////////////////
chris215 0:d2ed5a44c802 382 //
chris215 0:d2ed5a44c802 383 // This is the heart of the Genie comms state machine.
chris215 0:d2ed5a44c802 384 //
chris215 2:f283764fe9b7 385 uint16_t Mbed4dGenie::genieDoEvents (void) {
chris215 0:d2ed5a44c802 386 uint8_t c;
chris215 0:d2ed5a44c802 387 static uint8_t rx_data[6];
chris215 0:d2ed5a44c802 388 static uint8_t checksum = 0;
chris215 0:d2ed5a44c802 389
chris215 0:d2ed5a44c802 390 if (GenieReadable())
chris215 0:d2ed5a44c802 391 {
chris215 0:d2ed5a44c802 392 c = _genieGetchar();
chris215 0:d2ed5a44c802 393 //pc.putc(c);
chris215 0:d2ed5a44c802 394
chris215 0:d2ed5a44c802 395 ////////////////////////////////////////////
chris215 0:d2ed5a44c802 396 //
chris215 0:d2ed5a44c802 397 // If there are no characters to process and we have
chris215 0:d2ed5a44c802 398 // queued events call the user's handler function.
chris215 0:d2ed5a44c802 399 //
chris215 0:d2ed5a44c802 400 if (_genieError == ERROR_NOCHAR) {
chris215 0:d2ed5a44c802 401 //pc.printf("EventCalled!\n\r");
chris215 0:d2ed5a44c802 402 if (_genieEventQueue.n_events > 0 && _genieUserHandler!= NULL) (_genieUserHandler)();
chris215 0:d2ed5a44c802 403 return GENIE_EVENT_NONE;
chris215 0:d2ed5a44c802 404 }
chris215 0:d2ed5a44c802 405
chris215 0:d2ed5a44c802 406 ///////////////////////////////////////////
chris215 0:d2ed5a44c802 407 //
chris215 0:d2ed5a44c802 408 // Main state machine
chris215 0:d2ed5a44c802 409 //
chris215 0:d2ed5a44c802 410 switch (_genieGetLinkState()) {
chris215 0:d2ed5a44c802 411 case GENIE_LINK_IDLE:
chris215 0:d2ed5a44c802 412 switch (c) {
chris215 0:d2ed5a44c802 413 case GENIE_REPORT_EVENT:
chris215 0:d2ed5a44c802 414 // event frame out of the blue, set the link state
chris215 0:d2ed5a44c802 415 // and fall through to the frame-accumulate code
chris215 0:d2ed5a44c802 416 // at the end of this function
chris215 0:d2ed5a44c802 417 _geniePushLinkState(GENIE_LINK_RXEVENT);
chris215 0:d2ed5a44c802 418 break;
chris215 0:d2ed5a44c802 419
chris215 0:d2ed5a44c802 420 default:
chris215 0:d2ed5a44c802 421 // error, bad character, no other character
chris215 0:d2ed5a44c802 422 // is acceptable in this state
chris215 0:d2ed5a44c802 423 return GENIE_EVENT_RXCHAR;
chris215 0:d2ed5a44c802 424
chris215 0:d2ed5a44c802 425 }
chris215 0:d2ed5a44c802 426 break;
chris215 0:d2ed5a44c802 427
chris215 0:d2ed5a44c802 428 case GENIE_LINK_WFAN:
chris215 0:d2ed5a44c802 429 switch (c) {
chris215 0:d2ed5a44c802 430
chris215 0:d2ed5a44c802 431
chris215 0:d2ed5a44c802 432 case GENIE_ACK:
chris215 0:d2ed5a44c802 433 _geniePopLinkState();
chris215 0:d2ed5a44c802 434 return GENIE_EVENT_RXCHAR;
chris215 0:d2ed5a44c802 435
chris215 0:d2ed5a44c802 436
chris215 0:d2ed5a44c802 437 case GENIE_NAK:
chris215 0:d2ed5a44c802 438 _geniePopLinkState();
chris215 0:d2ed5a44c802 439 _genieError = ERROR_NAK;
chris215 0:d2ed5a44c802 440 _handleError();
chris215 0:d2ed5a44c802 441 return GENIE_EVENT_RXCHAR;
chris215 0:d2ed5a44c802 442
chris215 0:d2ed5a44c802 443 case GENIE_REPORT_EVENT:
chris215 0:d2ed5a44c802 444 // event frame out of the blue while waiting for an ACK
chris215 0:d2ed5a44c802 445 // save/set the link state and fall through to the
chris215 0:d2ed5a44c802 446 // frame-accumulate code at the end of this function
chris215 0:d2ed5a44c802 447 _geniePushLinkState(GENIE_LINK_RXEVENT);
chris215 0:d2ed5a44c802 448 break;
chris215 0:d2ed5a44c802 449
chris215 0:d2ed5a44c802 450
chris215 0:d2ed5a44c802 451 case GENIE_REPORT_OBJ:
chris215 0:d2ed5a44c802 452 default:
chris215 0:d2ed5a44c802 453 // error, bad character
chris215 0:d2ed5a44c802 454 return GENIE_EVENT_RXCHAR;
chris215 0:d2ed5a44c802 455 }
chris215 0:d2ed5a44c802 456 break;
chris215 0:d2ed5a44c802 457
chris215 0:d2ed5a44c802 458
chris215 0:d2ed5a44c802 459 case GENIE_LINK_WF_RXREPORT: // waiting for the first byte of a report
chris215 0:d2ed5a44c802 460 switch (c) {
chris215 0:d2ed5a44c802 461
chris215 0:d2ed5a44c802 462 case GENIE_REPORT_EVENT:
chris215 0:d2ed5a44c802 463 // event frame out of the blue while waiting for the first
chris215 0:d2ed5a44c802 464 // byte of a report frame
chris215 0:d2ed5a44c802 465 // save/set the link state and fall through to the
chris215 0:d2ed5a44c802 466 // frame-accumulate code at the end of this function
chris215 0:d2ed5a44c802 467 _geniePushLinkState(GENIE_LINK_RXEVENT);
chris215 0:d2ed5a44c802 468 break;
chris215 0:d2ed5a44c802 469
chris215 0:d2ed5a44c802 470
chris215 0:d2ed5a44c802 471 case GENIE_REPORT_OBJ:
chris215 0:d2ed5a44c802 472 // first byte of a report frame
chris215 0:d2ed5a44c802 473 // replace the GENIE_LINK_WF_RXREPORT link state
chris215 0:d2ed5a44c802 474 // with GENIE_LINK_RXREPORT to indicate that we
chris215 0:d2ed5a44c802 475 // are now receiving a report frame
chris215 0:d2ed5a44c802 476 _geniePopLinkState();
chris215 0:d2ed5a44c802 477 _geniePushLinkState(GENIE_LINK_RXREPORT);
chris215 0:d2ed5a44c802 478 break;
chris215 0:d2ed5a44c802 479
chris215 0:d2ed5a44c802 480
chris215 0:d2ed5a44c802 481 case GENIE_ACK:
chris215 0:d2ed5a44c802 482 case GENIE_NAK:
chris215 0:d2ed5a44c802 483 default:
chris215 0:d2ed5a44c802 484 // error, bad character
chris215 0:d2ed5a44c802 485 return GENIE_EVENT_RXCHAR;
chris215 0:d2ed5a44c802 486 // break;
chris215 0:d2ed5a44c802 487 }
chris215 0:d2ed5a44c802 488
chris215 0:d2ed5a44c802 489
chris215 0:d2ed5a44c802 490 case GENIE_LINK_RXREPORT: // already receiving report
chris215 0:d2ed5a44c802 491 case GENIE_LINK_RXEVENT: // already receiving event
chris215 0:d2ed5a44c802 492 default:
chris215 0:d2ed5a44c802 493 break;
chris215 0:d2ed5a44c802 494
chris215 0:d2ed5a44c802 495 }
chris215 0:d2ed5a44c802 496
chris215 0:d2ed5a44c802 497
chris215 0:d2ed5a44c802 498 ///////////////////////////////////////////////////////
chris215 0:d2ed5a44c802 499 // We get here if we are in the process of receiving
chris215 0:d2ed5a44c802 500 // a report or event frame. Accumulate GENIE_FRAME_SIZE
chris215 0:d2ed5a44c802 501 // bytes into a local buffer then queue them as a frame
chris215 0:d2ed5a44c802 502 // into the event queue
chris215 0:d2ed5a44c802 503 //
chris215 0:d2ed5a44c802 504 if (_genieGetLinkState() == GENIE_LINK_RXREPORT || \
chris215 0:d2ed5a44c802 505 _genieGetLinkState() == GENIE_LINK_RXEVENT) {
chris215 0:d2ed5a44c802 506
chris215 0:d2ed5a44c802 507 checksum = (rxframe_count == 0) ? c : checksum ^ c;
chris215 0:d2ed5a44c802 508
chris215 0:d2ed5a44c802 509
chris215 0:d2ed5a44c802 510 rx_data[rxframe_count] = c;
chris215 0:d2ed5a44c802 511
chris215 0:d2ed5a44c802 512
chris215 0:d2ed5a44c802 513 if (rxframe_count == GENIE_FRAME_SIZE -1) {
chris215 0:d2ed5a44c802 514 //pc.printf("FrameReceived!\n\r");
chris215 0:d2ed5a44c802 515 // all bytes received, if the CS is good
chris215 0:d2ed5a44c802 516 // queue the frame and restore the link state
chris215 0:d2ed5a44c802 517 if (checksum == 0) {
chris215 0:d2ed5a44c802 518 _genieEnqueueEvent(rx_data);
chris215 0:d2ed5a44c802 519 if (_genieEventQueue.n_events > 0 && _genieUserHandler!= NULL) (_genieUserHandler)();
chris215 0:d2ed5a44c802 520 //return GENIE_EVENT_NONE;
chris215 0:d2ed5a44c802 521 rxframe_count = 0;
chris215 0:d2ed5a44c802 522 // revert the link state to whatever it was before
chris215 0:d2ed5a44c802 523 // we started accumulating this frame
chris215 0:d2ed5a44c802 524 _geniePopLinkState();
chris215 0:d2ed5a44c802 525 return GENIE_EVENT_RXCHAR;
chris215 0:d2ed5a44c802 526 } else {
chris215 0:d2ed5a44c802 527 _genieError = ERROR_BAD_CS;
chris215 0:d2ed5a44c802 528 _handleError();
chris215 0:d2ed5a44c802 529 }
chris215 0:d2ed5a44c802 530 }
chris215 0:d2ed5a44c802 531 rxframe_count++;
chris215 0:d2ed5a44c802 532 return GENIE_EVENT_RXCHAR;
chris215 0:d2ed5a44c802 533 }
chris215 1:95e0e194a412 534 }
chris215 1:95e0e194a412 535 return GENIE_EVENT_NONE;
chris215 2:f283764fe9b7 536 }