Wim Huiskamp / HCMS2975

Alphanumeric LED display, 8 digits, 5x7 pattern. Supports 8x1, 8x2, 16x1 and 16x2 display configuration.

Dependents:   mbed_HCMS2975

Alphanumeric LED display, 8 digits, 5x7 LED pattern. The device has SPI interface. The library supports multiple devices connected in a daisy chain. This provides a 8x1, 8x2, 16x1 and 16x2 display configuration.The library methods are similar to those used for the LCDText library.

/media/uploads/wim/hcms2975.jpg

These displays are from mid 80s to mid 90s and they look cool, but they are rather expensive ($100 a piece..). The lib was developed and tested with displays salvaged from some equipment. You see them mostly in HP printers, medical equipment etc.

Some info can be found here and here.

Datasheet is here

HCMS2975.cpp@1:f46d90374eb2, 2015-01-05 (annotated)

Committer:
wim
Date:
Mon Jan 05 20:37:06 2015 +0000
Revision:
1:f46d90374eb2
Parent:
0:a332431006fb 
Fixed setBrightness() at init()

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wim 0:a332431006fb 1 /**
wim 0:a332431006fb 2 * @file HCMS2975.cpp
wim 0:a332431006fb 3 * @brief mbed Avago/HP HCMS2975 LED matrix display Library.
wim 0:a332431006fb 4 * @author WH
wim 0:a332431006fb 5 * @date Copyright (c) 2014
wim 0:a332431006fb 6 * v01: WH, Initial release
wim 0:a332431006fb 7 * Info available at http://playground.arduino.cc/Main/LedDisplay and http://www.pjrc.com/teensy/td_libs_LedDisplay.html
wim 1:f46d90374eb2 8 * v02: WH, added getVersion()
wim 1:f46d90374eb2 9 * v03: WH, fixed setBrightness at init() when there is no HW reset.
wim 0:a332431006fb 10 *
wim 0:a332431006fb 11 * Permission is hereby granted, free of charge, to any person obtaining a copy
wim 0:a332431006fb 12 * of this software and associated documentation files (the "Software"), to deal
wim 0:a332431006fb 13 * in the Software without restriction, including without limitation the rights
wim 0:a332431006fb 14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
wim 0:a332431006fb 15 * copies of the Software, and to permit persons to whom the Software is
wim 0:a332431006fb 16 * furnished to do so, subject to the following conditions:
wim 0:a332431006fb 17 *
wim 0:a332431006fb 18 * The above copyright notice and this permission notice shall be included in
wim 0:a332431006fb 19 * all copies or substantial portions of the Software.
wim 0:a332431006fb 20 *
wim 0:a332431006fb 21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
wim 0:a332431006fb 22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
wim 0:a332431006fb 23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
wim 0:a332431006fb 24 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
wim 0:a332431006fb 25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
wim 0:a332431006fb 26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
wim 0:a332431006fb 27 * THE SOFTWARE.
wim 0:a332431006fb 28 */
wim 0:a332431006fb 29 #include "mbed.h"
wim 0:a332431006fb 30 #include "HCMS2975.h"
wim 0:a332431006fb 31 #include "font_5x7.h" // Pascal Stang's 5x7 font library
wim 0:a332431006fb 32
wim 0:a332431006fb 33 // User Defined Characters (UDCs) are defined by a 5 byte bitpattern. The P0..P6 form the character pattern, P7 is ignored.
wim 0:a332431006fb 34 // Byte0 Byte1 Byte2 Byte3 Byte4
wim 0:a332431006fb 35 // b0 P0 P0 P0 P0 P0
wim 0:a332431006fb 36 // b1 P1 P1 P1 P1 P1
wim 0:a332431006fb 37 // . .............
wim 0:a332431006fb 38 // b6 P6 P6 P6 P6 P6
wim 0:a332431006fb 39 // b7 x x x x x
wim 0:a332431006fb 40
wim 0:a332431006fb 41 /** Some sample User Defined Chars 5x7 dots */
wim 0:a332431006fb 42 const char udc_0[] = {0x7F, 0x41, 0x22, 0x14, 0x08}; /* |> */
wim 0:a332431006fb 43 const char udc_1[] = {0x08, 0x14, 0x22, 0x41, 0x7F}; /* <| */
wim 0:a332431006fb 44 const char udc_2[] = {0x7F, 0x00, 0x00, 0x00, 0x00}; /* | */
wim 0:a332431006fb 45 const char udc_3[] = {0x7F, 0x00, 0x7F, 0x00, 0x00}; /* || */
wim 0:a332431006fb 46 const char udc_4[] = {0x7F, 0x00, 0x7F, 0x00, 0x7F}; /* ||| */
wim 0:a332431006fb 47 const char udc_5[] = {0x2A, 0x2A, 0x2A, 0x2A, 0x2A}; /* = */
wim 0:a332431006fb 48 const char udc_6[] = {0x55, 0x2A, 0x55, 0x2A, 0x55}; /* checkerboard */
wim 0:a332431006fb 49 const char udc_7[] = {0x01, 0x02, 0x04, 0x08, 0x10}; /* \ */
wim 0:a332431006fb 50
wim 0:a332431006fb 51 const char udc_Bat_Hi[] = {0x7E, 0x7F, 0x7F, 0x7F, 0x7E}; /* Battery Full */
wim 0:a332431006fb 52 const char udc_Bat_Ha[] = {0x7E, 0x7D, 0x7D, 0x7D, 0x7E}; /* Battery Half */
wim 0:a332431006fb 53 const char udc_Bat_Lo[] = {0x7E, 0x61, 0x61, 0x61, 0x7E}; /* Battery Low */
wim 0:a332431006fb 54 const char udc_AC[] = {0x0C, 0x17, 0x74, 0x17, 0x0C}; /* AC Power */
wim 0:a332431006fb 55 const char udc_smiley[] = {0x10, 0x22, 0x28, 0x22, 0x10}; /* Smiley */
wim 0:a332431006fb 56
wim 0:a332431006fb 57 /** Create an HCMS2975 Display object connected to the proper pins
wim 0:a332431006fb 58 *
wim 0:a332431006fb 59 * @param *spi SPI port
wim 0:a332431006fb 60 * @param cs PinName for Chip Select (active low)
wim 0:a332431006fb 61 * @param rs PinName for RS ()
wim 0:a332431006fb 62 * @param rst PinName for Rst (active low, optional, default=NC)
wim 0:a332431006fb 63 * @param type Sets the panel size (default = LED8x1)
wim 0:a332431006fb 64 */
wim 0:a332431006fb 65 HCMS2975::HCMS2975(SPI *spi, PinName cs, PinName rs, PinName rst, LEDType type) : _spi(spi), _cs(cs), _rs(rs), _type(type) {
wim 0:a332431006fb 66
wim 0:a332431006fb 67 // Extract LCDType data
wim 0:a332431006fb 68
wim 0:a332431006fb 69 // Columns encoded in b7..b0
wim 0:a332431006fb 70 _nr_cols = (_type & 0xFF);
wim 0:a332431006fb 71
wim 0:a332431006fb 72 // Rows encoded in b15..b8
wim 0:a332431006fb 73 _nr_rows = ((_type >> 8) & 0xFF);
wim 0:a332431006fb 74
wim 0:a332431006fb 75 _displaySize = _nr_cols * _nr_rows;
wim 0:a332431006fb 76
wim 0:a332431006fb 77 // Number of devices encoded in b23..b16
wim 0:a332431006fb 78 _deviceCount = ((_type >> 16) & 0xFF);
wim 0:a332431006fb 79
wim 0:a332431006fb 80
wim 0:a332431006fb 81 // The hardware Reset pin is optional. Test and make sure whether it exists or not to prevent illegal access.
wim 0:a332431006fb 82 if (rst != NC) {
wim 0:a332431006fb 83 _rst = new DigitalOut(rst); //Construct new pin
wim 0:a332431006fb 84 _rst->write(1); //Deactivate
wim 0:a332431006fb 85 }
wim 0:a332431006fb 86 else {
wim 0:a332431006fb 87 // No Hardware Backlight pin
wim 0:a332431006fb 88 _rst = NULL; //Construct dummy pin
wim 0:a332431006fb 89 }
wim 0:a332431006fb 90
wim 0:a332431006fb 91 _init();
wim 0:a332431006fb 92 }
wim 0:a332431006fb 93
wim 0:a332431006fb 94 /** Destructor for HCMS2975 Display object
wim 0:a332431006fb 95 *
wim 0:a332431006fb 96 */
wim 0:a332431006fb 97 HCMS2975::~HCMS2975() {
wim 0:a332431006fb 98 if (_rst != NULL) {delete _rst;} // RST pin
wim 0:a332431006fb 99 }
wim 0:a332431006fb 100
wim 0:a332431006fb 101 #if(HCMS2975_PRINTF != 1)
wim 0:a332431006fb 102 /** Write a character to the Display
wim 0:a332431006fb 103 *
wim 0:a332431006fb 104 * @param c The character to write to the display
wim 0:a332431006fb 105 */
wim 0:a332431006fb 106 int HCMS2975::putc(int c){
wim 0:a332431006fb 107 return _putc(c);
wim 0:a332431006fb 108 }
wim 0:a332431006fb 109
wim 0:a332431006fb 110 /** Write a raw string to the Display
wim 0:a332431006fb 111 *
wim 0:a332431006fb 112 * @param string text, may be followed by variables to emulate formatting the string.
wim 0:a332431006fb 113 * However, printf formatting is NOT supported and variables will be ignored!
wim 0:a332431006fb 114 */
wim 0:a332431006fb 115 int HCMS2975::printf(const char* text, ...) {
wim 0:a332431006fb 116
wim 0:a332431006fb 117 while (*text !=0) {
wim 0:a332431006fb 118 _putc(*text);
wim 0:a332431006fb 119 text++;
wim 0:a332431006fb 120 }
wim 0:a332431006fb 121 return 0;
wim 0:a332431006fb 122 }
wim 0:a332431006fb 123 #else
wim 0:a332431006fb 124 #if DOXYGEN_ONLY
wim 0:a332431006fb 125 /** Write a character to the Display
wim 0:a332431006fb 126 *
wim 0:a332431006fb 127 * @param c The character to write to the display
wim 0:a332431006fb 128 */
wim 0:a332431006fb 129 int HCMS2975::putc(int c){
wim 0:a332431006fb 130 return _putc(c);
wim 0:a332431006fb 131 }
wim 0:a332431006fb 132
wim 0:a332431006fb 133 /** Write a formatted string to the Display
wim 0:a332431006fb 134 *
wim 0:a332431006fb 135 * @param format A printf-style format string, followed by the
wim 0:a332431006fb 136 * variables to use in formatting the string.
wim 0:a332431006fb 137 */
wim 0:a332431006fb 138 int HCMS2975::printf(const char* format, ...){
wim 0:a332431006fb 139 }
wim 0:a332431006fb 140 #endif
wim 0:a332431006fb 141
wim 0:a332431006fb 142 #endif
wim 0:a332431006fb 143
wim 0:a332431006fb 144 /** Clear the screen and locate to 0,0
wim 0:a332431006fb 145 */
wim 0:a332431006fb 146 void HCMS2975::cls(){
wim 0:a332431006fb 147
wim 0:a332431006fb 148 // fill _displayBuffer with spaces
wim 0:a332431006fb 149 for (int i=0; i < HCMS2975_BUFFER_SIZE; i++) {
wim 0:a332431006fb 150 _displayBuffer[i] = ' ';
wim 0:a332431006fb 151 }
wim 0:a332431006fb 152
wim 0:a332431006fb 153 // display buffer
wim 0:a332431006fb 154 _pushBuffer();
wim 0:a332431006fb 155
wim 0:a332431006fb 156 //cursor
wim 0:a332431006fb 157 _row = 0;
wim 0:a332431006fb 158 _column = 0;
wim 0:a332431006fb 159 }
wim 0:a332431006fb 160
wim 0:a332431006fb 161 /** Locate cursor to a screen column and row
wim 0:a332431006fb 162 *
wim 0:a332431006fb 163 * @param column The horizontal position from the left, indexed from 0
wim 0:a332431006fb 164 * @param row The vertical position from the top, indexed from 0
wim 0:a332431006fb 165 */
wim 0:a332431006fb 166 void HCMS2975::locate(int column, int row){
wim 0:a332431006fb 167
wim 0:a332431006fb 168 // Sanity Check column
wim 0:a332431006fb 169 if (column < 0) {
wim 0:a332431006fb 170 _column = 0;
wim 0:a332431006fb 171 }
wim 0:a332431006fb 172 else {
wim 0:a332431006fb 173 if (column >= _nr_cols) {
wim 0:a332431006fb 174 _column = _nr_cols - 1;
wim 0:a332431006fb 175 }
wim 0:a332431006fb 176 else {
wim 0:a332431006fb 177 _column = column;
wim 0:a332431006fb 178 }
wim 0:a332431006fb 179 }
wim 0:a332431006fb 180
wim 0:a332431006fb 181 // Sanity Check row
wim 0:a332431006fb 182 if (row < 0) {
wim 0:a332431006fb 183 _row = 0;
wim 0:a332431006fb 184 }
wim 0:a332431006fb 185 else {
wim 0:a332431006fb 186 if (row >= _nr_rows) {
wim 0:a332431006fb 187 _row = _nr_rows - 1;
wim 0:a332431006fb 188 }
wim 0:a332431006fb 189 else {
wim 0:a332431006fb 190 _row = row;
wim 0:a332431006fb 191 }
wim 0:a332431006fb 192 }
wim 0:a332431006fb 193 }
wim 0:a332431006fb 194
wim 0:a332431006fb 195 /** Return the number of columns
wim 0:a332431006fb 196 *
wim 1:f46d90374eb2 197 * @return int The number of columns
wim 0:a332431006fb 198 */
wim 0:a332431006fb 199 int HCMS2975::columns() {
wim 0:a332431006fb 200
wim 0:a332431006fb 201 // Columns encoded in b7..b0
wim 0:a332431006fb 202 //return (_type & 0xFF);
wim 0:a332431006fb 203 return _nr_cols;
wim 0:a332431006fb 204 }
wim 0:a332431006fb 205
wim 0:a332431006fb 206 /** Return the number of rows
wim 0:a332431006fb 207 *
wim 1:f46d90374eb2 208 * @return int The number of rows
wim 0:a332431006fb 209 */
wim 0:a332431006fb 210 int HCMS2975::rows() {
wim 0:a332431006fb 211
wim 0:a332431006fb 212 // Rows encoded in b15..b8
wim 0:a332431006fb 213 //return ((_type >> 8) & 0xFF);
wim 0:a332431006fb 214 return _nr_rows;
wim 0:a332431006fb 215 }
wim 0:a332431006fb 216
wim 0:a332431006fb 217
wim 0:a332431006fb 218 /** Set Brightness
wim 0:a332431006fb 219 *
wim 0:a332431006fb 220 * @param brightness The brightness level (valid range 0..15)
wim 0:a332431006fb 221 */
wim 0:a332431006fb 222 void HCMS2975::setBrightness(uint8_t brightness){
wim 0:a332431006fb 223
wim 0:a332431006fb 224 _brightness = brightness & 0x0F;
wim 0:a332431006fb 225
wim 0:a332431006fb 226 //Set brightness
wim 0:a332431006fb 227 //Set display to normal
wim 0:a332431006fb 228 _writeCommand(HCMS2975_CONTROL0 | HCMS2975_NORMAL | _peak | _brightness);
wim 0:a332431006fb 229 }
wim 0:a332431006fb 230
wim 0:a332431006fb 231 /** Set the Displaymode
wim 0:a332431006fb 232 *
wim 0:a332431006fb 233 * @param displayMode The Display mode (DispOff, DispOn)
wim 0:a332431006fb 234 */
wim 0:a332431006fb 235 void HCMS2975::setMode(DisplayMode displayMode){
wim 0:a332431006fb 236
wim 0:a332431006fb 237 if (displayMode == DispOff) {
wim 0:a332431006fb 238 //Set brightness to Zero
wim 0:a332431006fb 239 _writeCommand(HCMS2975_CONTROL0 | HCMS2975_NORMAL | _peak | HCMS2975_BRIGHT_0);
wim 0:a332431006fb 240 // //Set Sleep mode
wim 0:a332431006fb 241 // _writeCommand(HCMS2975_CONTROL0 | HCMS2975_SLP | _peak | _brightness);
wim 0:a332431006fb 242 }
wim 0:a332431006fb 243 else {
wim 0:a332431006fb 244 //Restore brightness
wim 0:a332431006fb 245 //Set display to normal
wim 0:a332431006fb 246 _writeCommand(HCMS2975_CONTROL0 | HCMS2975_NORMAL | _peak | _brightness);
wim 0:a332431006fb 247 }
wim 0:a332431006fb 248 }
wim 0:a332431006fb 249
wim 0:a332431006fb 250 /** Set User Defined Characters (UDC)
wim 0:a332431006fb 251 *
wim 0:a332431006fb 252 * @param unsigned char c The Index of the UDC (0..7)
wim 0:a332431006fb 253 * @param char *udc_data The bitpatterns for the UDC (5 bytes of 7 significant bits for bitpattern)
wim 0:a332431006fb 254 */
wim 0:a332431006fb 255 void HCMS2975::setUDC(unsigned char c, char *udc_data){
wim 0:a332431006fb 256 char *udc;
wim 0:a332431006fb 257 int idx;
wim 0:a332431006fb 258
wim 0:a332431006fb 259 c = c & 0x07; // mask to valid range
wim 0:a332431006fb 260
wim 0:a332431006fb 261 udc = (char *) _udc[c];
wim 0:a332431006fb 262
wim 0:a332431006fb 263 // Copy UDC data to local UDC memory
wim 0:a332431006fb 264 for (idx=0; idx < 5; idx++) {
wim 0:a332431006fb 265 *udc++ = *udc_data++;
wim 0:a332431006fb 266 }
wim 0:a332431006fb 267 }
wim 0:a332431006fb 268
wim 0:a332431006fb 269
wim 0:a332431006fb 270 /** Low level Reset method for controller
wim 0:a332431006fb 271 */
wim 0:a332431006fb 272 void HCMS2975::_reset(){
wim 0:a332431006fb 273
wim 0:a332431006fb 274 // Reset when pin defined
wim 0:a332431006fb 275 if (_rst) {
wim 0:a332431006fb 276 _rst->write(0);
wim 0:a332431006fb 277 wait_us(500);
wim 0:a332431006fb 278 _rst->write(1);
wim 0:a332431006fb 279 }
wim 0:a332431006fb 280 }
wim 0:a332431006fb 281
wim 0:a332431006fb 282 /** Low level Init method for controller
wim 0:a332431006fb 283 */
wim 0:a332431006fb 284 void HCMS2975::_init(){
wim 0:a332431006fb 285
wim 0:a332431006fb 286 // Hard Reset
wim 0:a332431006fb 287 _reset();
wim 0:a332431006fb 288
wim 0:a332431006fb 289 // Init CS en RS
wim 0:a332431006fb 290 _cs = 1;
wim 0:a332431006fb 291 _rs = 0;
wim 0:a332431006fb 292
wim 0:a332431006fb 293 // Setup the spi for 8 bit data, low steady state clock,
wim 0:a332431006fb 294 // rising edge capture, with a 500KHz or 1MHz clock rate
wim 0:a332431006fb 295 _spi->format(8,0);
wim 0:a332431006fb 296 _spi->frequency(1000000); // Max SCL is 5 MHz for HCMS2975
wim 0:a332431006fb 297 // _spi->frequency(50000); // Max SCL is 5 MHz for HCMS2975
wim 1:f46d90374eb2 298
wim 1:f46d90374eb2 299 //Set display to serial mode
wim 1:f46d90374eb2 300 _writeCommand(HCMS2975_CONTROL1 | HCMS2975_PRE_1 | HCMS2975_SERIAL);
wim 0:a332431006fb 301
wim 0:a332431006fb 302 // default display brightness and peak
wim 0:a332431006fb 303 _brightness = HCMS2975_DEF_BRIGHT;
wim 0:a332431006fb 304 _peak = HCMS2975_DEF_PEAK;
wim 0:a332431006fb 305
wim 0:a332431006fb 306 //Set display to normal
wim 0:a332431006fb 307 _writeCommand(HCMS2975_CONTROL0 | HCMS2975_NORMAL | _peak | _brightness);
wim 0:a332431006fb 308
wim 1:f46d90374eb2 309 //Clear display
wim 1:f46d90374eb2 310 cls();
wim 0:a332431006fb 311 }
wim 0:a332431006fb 312
wim 0:a332431006fb 313
wim 0:a332431006fb 314 /** Low level command byte write operation.
wim 0:a332431006fb 315 * @param command commandbyte to write
wim 0:a332431006fb 316 */
wim 0:a332431006fb 317 void HCMS2975::_writeCommand(uint8_t command){
wim 0:a332431006fb 318 int cnt;
wim 0:a332431006fb 319
wim 0:a332431006fb 320 // Set RS
wim 0:a332431006fb 321 _rs = 1;
wim 0:a332431006fb 322 wait_us(1);
wim 0:a332431006fb 323
wim 0:a332431006fb 324 // Enable CS
wim 0:a332431006fb 325 _cs = 0;
wim 0:a332431006fb 326 wait_us(1);
wim 0:a332431006fb 327
wim 0:a332431006fb 328 // Must write the command to all devices...!
wim 0:a332431006fb 329 // Note that internally the 8 digit display consist of 2 display devices with 4 digits each!
wim 0:a332431006fb 330 for (cnt=0; cnt < (_deviceCount << 1); cnt++) {
wim 0:a332431006fb 331 _spi->write(command);
wim 0:a332431006fb 332 // wait_us(1); // Min setup time is x ns for HCMS2975
wim 0:a332431006fb 333 }
wim 0:a332431006fb 334
wim 0:a332431006fb 335 // Disable CS
wim 0:a332431006fb 336 _cs = 1;
wim 0:a332431006fb 337
wim 0:a332431006fb 338 // Reset RS
wim 0:a332431006fb 339 _rs = 0;
wim 0:a332431006fb 340
wim 0:a332431006fb 341 }
wim 0:a332431006fb 342
wim 0:a332431006fb 343 /** Low level _dataBuffer write operation.
wim 0:a332431006fb 344 */
wim 0:a332431006fb 345 void HCMS2975::_pushBuffer(){
wim 0:a332431006fb 346 char charcode;
wim 0:a332431006fb 347 char *fnt_ptr;
wim 0:a332431006fb 348 int idx, pidx;
wim 0:a332431006fb 349
wim 0:a332431006fb 350 // Reset RS
wim 0:a332431006fb 351 _rs = 0;
wim 0:a332431006fb 352 wait_us(1);
wim 0:a332431006fb 353
wim 0:a332431006fb 354 // Enable CS
wim 0:a332431006fb 355 _cs = 0;
wim 0:a332431006fb 356 wait_us(1);
wim 0:a332431006fb 357
wim 0:a332431006fb 358 // Encode and push the character data to the display
wim 0:a332431006fb 359 for (idx=0; idx < _displaySize; idx++) {
wim 0:a332431006fb 360 charcode = _displayBuffer[idx];
wim 0:a332431006fb 361
wim 0:a332431006fb 362 //Sanity check and font pointer
wim 0:a332431006fb 363 if (charcode < 0x08) {
wim 0:a332431006fb 364 //UDC
wim 0:a332431006fb 365 fnt_ptr = (char *) _udc[charcode];
wim 0:a332431006fb 366 }
wim 0:a332431006fb 367 else {
wim 0:a332431006fb 368 if ((charcode < 0x20) || (charcode > 0x7F)) {
wim 0:a332431006fb 369 // non-printable, show 'space'
wim 0:a332431006fb 370 fnt_ptr = (char *) font_5x7[0];
wim 0:a332431006fb 371 }
wim 0:a332431006fb 372 else {
wim 0:a332431006fb 373 //Pointer to char pattern
wim 0:a332431006fb 374 fnt_ptr = (char *) font_5x7[charcode - 0x20];
wim 0:a332431006fb 375 }
wim 0:a332431006fb 376 } // end sanity check
wim 0:a332431006fb 377
wim 0:a332431006fb 378 //Write char pattern of 5 bytes
wim 0:a332431006fb 379 for (pidx=0; pidx < 5; pidx++) {
wim 0:a332431006fb 380 _spi->write(*fnt_ptr);
wim 0:a332431006fb 381 fnt_ptr++;
wim 0:a332431006fb 382 //wait_us(1); // Min setup time is x ns for HCMS2975
wim 0:a332431006fb 383 } //for pidx
wim 0:a332431006fb 384
wim 0:a332431006fb 385 } //for idx
wim 0:a332431006fb 386
wim 0:a332431006fb 387 // Disable CS
wim 0:a332431006fb 388 _cs = 1;
wim 0:a332431006fb 389
wim 0:a332431006fb 390 }
wim 0:a332431006fb 391
wim 0:a332431006fb 392
wim 0:a332431006fb 393 // Stream implementation functions
wim 0:a332431006fb 394 int HCMS2975::_putc(int value){
wim 0:a332431006fb 395
wim 0:a332431006fb 396 if ((value == '\n') || (value == '\r')) {
wim 0:a332431006fb 397 //No character to write
wim 0:a332431006fb 398
wim 0:a332431006fb 399 //Update Cursor
wim 0:a332431006fb 400 _column = 0;
wim 0:a332431006fb 401 _row++;
wim 0:a332431006fb 402 if (_row >= _nr_rows) {
wim 0:a332431006fb 403 _row = 0;
wim 0:a332431006fb 404 }
wim 0:a332431006fb 405
wim 0:a332431006fb 406 return 0;
wim 0:a332431006fb 407 }
wim 0:a332431006fb 408 else {
wim 0:a332431006fb 409 //Character to write
wim 0:a332431006fb 410 _displayBuffer[(_row * _nr_cols) + _column] = value;
wim 0:a332431006fb 411
wim 0:a332431006fb 412 //Update Cursor
wim 0:a332431006fb 413 _column++;
wim 0:a332431006fb 414 if (_column >= _nr_cols) {
wim 0:a332431006fb 415 _column = 0;
wim 0:a332431006fb 416 _row++;
wim 0:a332431006fb 417 if (_row >= _nr_rows) {
wim 0:a332431006fb 418 _row = 0;
wim 0:a332431006fb 419 }
wim 0:a332431006fb 420 }
wim 0:a332431006fb 421
wim 0:a332431006fb 422 // push new data to display
wim 0:a332431006fb 423 _pushBuffer();
wim 0:a332431006fb 424
wim 0:a332431006fb 425 return 0;
wim 0:a332431006fb 426 } //else
wim 0:a332431006fb 427
wim 0:a332431006fb 428 }
wim 0:a332431006fb 429
wim 0:a332431006fb 430
wim 0:a332431006fb 431 // Stream implementation functions
wim 0:a332431006fb 432 int HCMS2975::_getc(){
wim 0:a332431006fb 433 return -1;
wim 0:a332431006fb 434 }
wim 0:a332431006fb 435
wim 1:f46d90374eb2 436
wim 0:a332431006fb 437 /** Returns the version number of the library
wim 0:a332431006fb 438 * @return int version number
wim 0:a332431006fb 439 */
wim 0:a332431006fb 440 int HCMS2975::getVersion() {
wim 1:f46d90374eb2 441 return HCMS2975_VERSION;
wim 0:a332431006fb 442 }