Pedro Cruz / PCF8583_rtc

a copy of PCF8583_rtc lib with some modification

Fork of PCF8583_rtc by Dennis Smith

PCF8583_rtc.cpp@0:7b654820260e, 2014-02-14 (annotated)

Committer:
dennyem
Date:
Fri Feb 14 00:21:38 2014 +0000
Revision:
0:7b654820260e
Child:
1:eaba89d6e5d8
Made into a library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dennyem 0:7b654820260e 1 /**
dennyem 0:7b654820260e 2 ********************************************************************************
dennyem 0:7b654820260e 3 * An mbed class to control the PCF8583 Real time Clock/Calender
dennyem 0:7b654820260e 4 * Copyright (c) 2014 Dennis (Denny) Smith - dennyem
dennyem 0:7b654820260e 5 *
dennyem 0:7b654820260e 6 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
dennyem 0:7b654820260e 7 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
dennyem 0:7b654820260e 8 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
dennyem 0:7b654820260e 9 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
dennyem 0:7b654820260e 10 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
dennyem 0:7b654820260e 11 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
dennyem 0:7b654820260e 12 * THE SOFTWARE.
dennyem 0:7b654820260e 13 *
dennyem 0:7b654820260e 14 * 13.01.14 initial design for PIC devices using PICC compiler
dennyem 0:7b654820260e 15 * 21.01.14 ported to mBed LPC1768 in 'C'
dennyem 0:7b654820260e 16 * 09.02.14 converted to C++ and ported to mBed LPC812
dennyem 0:7b654820260e 17 *
dennyem 0:7b654820260e 18 * TODO
dennyem 0:7b654820260e 19 * FormatDateTime needs am/pm, 12/24 hour parsing
dennyem 0:7b654820260e 20 * Alarm functions not yet implemented
dennyem 0:7b654820260e 21 */
dennyem 0:7b654820260e 22
dennyem 0:7b654820260e 23 #include <mbed.h>
dennyem 0:7b654820260e 24 #include <PCF8583_rtc.h>
dennyem 0:7b654820260e 25
dennyem 0:7b654820260e 26 //-----------------------------------------------------------------------------
dennyem 0:7b654820260e 27 // constructor -- accepts an I2c object to use for connection with the rtc
dennyem 0:7b654820260e 28 PCF8583rtc::PCF8583rtc(I2C *i2c, char I2cAddress)
dennyem 0:7b654820260e 29 {
dennyem 0:7b654820260e 30 _i2c = i2c;
dennyem 0:7b654820260e 31 _I2cAddress = I2cAddress;
dennyem 0:7b654820260e 32
dennyem 0:7b654820260e 33 configureControlReg(0);
dennyem 0:7b654820260e 34
dennyem 0:7b654820260e 35 ShortDateFormat = "d,m,yy";
dennyem 0:7b654820260e 36 LongDateFormat = "dddd dd mmmm yyyy";
dennyem 0:7b654820260e 37 ShortTimeFormat = "d:m:yy";
dennyem 0:7b654820260e 38 LongTimeFormat = "dd:nn:yyyy";
dennyem 0:7b654820260e 39
dennyem 0:7b654820260e 40 DateSeparator = '/';
dennyem 0:7b654820260e 41 TimeSeparator = ':';
dennyem 0:7b654820260e 42
dennyem 0:7b654820260e 43 ShortDayNames[0] = "Mon";
dennyem 0:7b654820260e 44 ShortDayNames[1] = "Tue";
dennyem 0:7b654820260e 45 ShortDayNames[2] = "Wed";
dennyem 0:7b654820260e 46 ShortDayNames[3] = "Thu";
dennyem 0:7b654820260e 47 ShortDayNames[4] = "Fri";
dennyem 0:7b654820260e 48 ShortDayNames[5] = "Sat";
dennyem 0:7b654820260e 49 ShortDayNames[6] = "Sun";
dennyem 0:7b654820260e 50
dennyem 0:7b654820260e 51 LongDayNames[0] = "Monday";
dennyem 0:7b654820260e 52 LongDayNames[1] = "Tuesday";
dennyem 0:7b654820260e 53 LongDayNames[2] = "Wednesday";
dennyem 0:7b654820260e 54 LongDayNames[3] = "Thursday";
dennyem 0:7b654820260e 55 LongDayNames[4] = "Friday";
dennyem 0:7b654820260e 56 LongDayNames[5] = "Saturday";
dennyem 0:7b654820260e 57 LongDayNames[6] = "Sunday";
dennyem 0:7b654820260e 58
dennyem 0:7b654820260e 59 ShortMonthNames[0] = "Jan";
dennyem 0:7b654820260e 60 ShortMonthNames[1] = "Feb";
dennyem 0:7b654820260e 61 ShortMonthNames[2] = "Mar";
dennyem 0:7b654820260e 62 ShortMonthNames[3] = "Apr";
dennyem 0:7b654820260e 63 ShortMonthNames[4] = "May";
dennyem 0:7b654820260e 64 ShortMonthNames[5] = "Jun";
dennyem 0:7b654820260e 65 ShortMonthNames[6] = "Jul";
dennyem 0:7b654820260e 66 ShortMonthNames[7] = "Aug";
dennyem 0:7b654820260e 67 ShortMonthNames[8] = "Sep";
dennyem 0:7b654820260e 68 ShortMonthNames[9] = "Oct";
dennyem 0:7b654820260e 69 ShortMonthNames[10] = "Nov";
dennyem 0:7b654820260e 70 ShortMonthNames[11] = "Dec";
dennyem 0:7b654820260e 71
dennyem 0:7b654820260e 72 LongMonthNames[0] = "January";
dennyem 0:7b654820260e 73 LongMonthNames[1] = "February";
dennyem 0:7b654820260e 74 LongMonthNames[2] = "March";
dennyem 0:7b654820260e 75 LongMonthNames[3] = "April";
dennyem 0:7b654820260e 76 LongMonthNames[4] = "May";
dennyem 0:7b654820260e 77 LongMonthNames[5] = "June";
dennyem 0:7b654820260e 78 LongMonthNames[6] = "July";
dennyem 0:7b654820260e 79 LongMonthNames[7] = "August";
dennyem 0:7b654820260e 80 LongMonthNames[8] = "September";
dennyem 0:7b654820260e 81 LongMonthNames[9] = "October";
dennyem 0:7b654820260e 82 LongMonthNames[10] = "November";
dennyem 0:7b654820260e 83 LongMonthNames[11] = "December";
dennyem 0:7b654820260e 84 };
dennyem 0:7b654820260e 85
dennyem 0:7b654820260e 86 void PCF8583rtc::write(const char address, struct DateTime_t dti)
dennyem 0:7b654820260e 87 {
dennyem 0:7b654820260e 88 char tmp[8];
dennyem 0:7b654820260e 89
dennyem 0:7b654820260e 90 pauseCounting(); //Must stop counting before initialising Date/time
dennyem 0:7b654820260e 91
dennyem 0:7b654820260e 92 tmp[0] = address; // Address is 1 for Time or 10 for Alarm
dennyem 0:7b654820260e 93
dennyem 0:7b654820260e 94 //Values must be in BCD form
dennyem 0:7b654820260e 95 tmp[1] = dti.time.hundreds; // Hundredths of a second
dennyem 0:7b654820260e 96 tmp[2] = dti.time.seconds; // Seconds
dennyem 0:7b654820260e 97 tmp[3] = dti.time.minutes; // Minutes
dennyem 0:7b654820260e 98 tmp[4] = dti.time.hours; // Hours
dennyem 0:7b654820260e 99 tmp[5] = dti.date.day & 0x3F; // Always set the 3 year bits to 0
dennyem 0:7b654820260e 100
dennyem 0:7b654820260e 101 if(address == TIME)
dennyem 0:7b654820260e 102 tmp[6] = (((dti.date.weekday & 7) << 5 ) | dti.date.month); // Weekday/month
dennyem 0:7b654820260e 103 else
dennyem 0:7b654820260e 104 tmp[6] = dti.date.month & 0x1f; // No Weekday for alarm
dennyem 0:7b654820260e 105
dennyem 0:7b654820260e 106 _i2c->write(_I2cAddress, tmp, 7); // Address PCF8583, see PCF8583 datasheet
dennyem 0:7b654820260e 107 _i2c->stop();
dennyem 0:7b654820260e 108
dennyem 0:7b654820260e 109 if(address == TIME) {
dennyem 0:7b654820260e 110 writeByte(CENTURY_REG, dti.date.century); // Store the full 4 digit year in NV Ram
dennyem 0:7b654820260e 111 writeByte(YEAR_REG, dti.date.year);
dennyem 0:7b654820260e 112 };
dennyem 0:7b654820260e 113
dennyem 0:7b654820260e 114 enableCounting();
dennyem 0:7b654820260e 115 };
dennyem 0:7b654820260e 116
dennyem 0:7b654820260e 117 //--------------------- Reads time and date information from RTC (PCF8583)
dennyem 0:7b654820260e 118 struct DateTime_t PCF8583rtc::read(const char address)
dennyem 0:7b654820260e 119 {
dennyem 0:7b654820260e 120 char tmp[8];
dennyem 0:7b654820260e 121 char year_bits = 0; // To test for year change
dennyem 0:7b654820260e 122
dennyem 0:7b654820260e 123 tmp[0] = address;
dennyem 0:7b654820260e 124 _i2c->write(_I2cAddress, tmp, 1); // Address PCF8583, see PCF8583 datasheet
dennyem 0:7b654820260e 125 _i2c->read(_I2cAddress | 1, tmp, 6); // Address PCF8583 for reading R/W=1
dennyem 0:7b654820260e 126 _i2c->stop();
dennyem 0:7b654820260e 127
dennyem 0:7b654820260e 128 dt.time.hundreds = tmp[0];
dennyem 0:7b654820260e 129 dt.time.seconds = tmp[1];
dennyem 0:7b654820260e 130 dt.time.minutes = tmp[2];
dennyem 0:7b654820260e 131 dt.time.hours = tmp[3] & 0x3F;
dennyem 0:7b654820260e 132 dt.time.fmt_hours = tmp[3] & 0x80; // 12/24 hour format
dennyem 0:7b654820260e 133 dt.time.am_pm_flag = tmp[3] & 0x40; // Am/Pm flag
dennyem 0:7b654820260e 134 dt.date.day = tmp[4] & 0x3F; // Day of the Month
dennyem 0:7b654820260e 135 dt.date.month = tmp[5] & 0x1F;
dennyem 0:7b654820260e 136
dennyem 0:7b654820260e 137 if(address == TIME)
dennyem 0:7b654820260e 138 year_bits = (tmp[4] & 0xC0) >> 6;
dennyem 0:7b654820260e 139 else
dennyem 0:7b654820260e 140 dt.date.year = 0; // No year for alarm
dennyem 0:7b654820260e 141
dennyem 0:7b654820260e 142
dennyem 0:7b654820260e 143 if(address == TIME)
dennyem 0:7b654820260e 144 dt.date.weekday = tmp[5] >> 5;
dennyem 0:7b654820260e 145 else
dennyem 0:7b654820260e 146 dt.date.weekday = 0; // No weekday for alarm
dennyem 0:7b654820260e 147
dennyem 0:7b654820260e 148 if(address == TIME) {
dennyem 0:7b654820260e 149 tmp[0] = readByte(CENTURY_REG);
dennyem 0:7b654820260e 150 dt.date.century = ((tmp[0] & 0xF0) >> 4) * 10 + (tmp[0] & 0x0F);
dennyem 0:7b654820260e 151 tmp[0] = readByte(YEAR_REG);
dennyem 0:7b654820260e 152 dt.date.year = ((tmp[0] & 0xF0) >> 4) * 10 + (tmp[0] & 0x0F);
dennyem 0:7b654820260e 153
dennyem 0:7b654820260e 154 if(year_bits > 0) { // Midnight on new years eve?
dennyem 0:7b654820260e 155 dt.date.year += 1; // Increment the year
dennyem 0:7b654820260e 156 writeByte(YEAR_REG, dt.date.year); // Save the new year value to NV Ram
dennyem 0:7b654820260e 157 writeByte(5, dt.date.day & 0x3F); // Clear the year bits but preserve the date
dennyem 0:7b654820260e 158 }
dennyem 0:7b654820260e 159 }
dennyem 0:7b654820260e 160
dennyem 0:7b654820260e 161 return dt;
dennyem 0:7b654820260e 162 };
dennyem 0:7b654820260e 163
dennyem 0:7b654820260e 164 void PCF8583rtc::FormatDateTime(char *dest, char *f)
dennyem 0:7b654820260e 165 {
dennyem 0:7b654820260e 166 int i;
dennyem 0:7b654820260e 167
dennyem 0:7b654820260e 168 if(f != 0 && *f != 0) { //If the format param is empty then do a default 'c'
dennyem 0:7b654820260e 169 while(*f != 0) { //expect null terminated string (we hope)
dennyem 0:7b654820260e 170 switch(*f) {
dennyem 0:7b654820260e 171 case 'c':
dennyem 0:7b654820260e 172 break;
dennyem 0:7b654820260e 173 case 'd':
dennyem 0:7b654820260e 174 if(*(f+1) != 'd') { //'d' - Day with no leading zero
dennyem 0:7b654820260e 175 dest += Bcd2Char(dest, dt.date.day, false);
dennyem 0:7b654820260e 176 } else {
dennyem 0:7b654820260e 177 f++;
dennyem 0:7b654820260e 178 if(*(f+1) != 'd') //'dd' - Day with leading zero
dennyem 0:7b654820260e 179 dest += Bcd2Char(dest, dt.date.day, true);
dennyem 0:7b654820260e 180 else {
dennyem 0:7b654820260e 181 f++;
dennyem 0:7b654820260e 182 if(*(f+1) != 'd') { //'ddd' - Short day name
dennyem 0:7b654820260e 183 i = 0;
dennyem 0:7b654820260e 184 while(ShortDayNames[dt.date.weekday][i] != 0)
dennyem 0:7b654820260e 185 *dest++ = ShortDayNames[dt.date.weekday][i++];
dennyem 0:7b654820260e 186 } else {
dennyem 0:7b654820260e 187 f++;
dennyem 0:7b654820260e 188 i = 0;
dennyem 0:7b654820260e 189 while(LongDayNames[dt.date.weekday][i] != 0)
dennyem 0:7b654820260e 190 *dest++ = LongDayNames[dt.date.weekday][i++];
dennyem 0:7b654820260e 191 }
dennyem 0:7b654820260e 192 }
dennyem 0:7b654820260e 193 }
dennyem 0:7b654820260e 194 break;
dennyem 0:7b654820260e 195 case 'm':
dennyem 0:7b654820260e 196 if(*(f+1) != 'm') { //'m' - Month with no leading zero
dennyem 0:7b654820260e 197 dest += Bcd2Char(dest, dt.date.month, false);
dennyem 0:7b654820260e 198 } else {
dennyem 0:7b654820260e 199 f++;
dennyem 0:7b654820260e 200 if(*(f+1) != 'm') //'mm' - Month with leading zero
dennyem 0:7b654820260e 201 dest += Bcd2Char(dest, dt.date.month, true);
dennyem 0:7b654820260e 202 else {
dennyem 0:7b654820260e 203 f++;
dennyem 0:7b654820260e 204 if(*(f+1) != 'm') { //'mmm' - Short month name
dennyem 0:7b654820260e 205 i = 0;
dennyem 0:7b654820260e 206 while(ShortMonthNames[dt.date.month - 1][i] != 0)
dennyem 0:7b654820260e 207 *dest++ = ShortMonthNames[dt.date.month - 1][i++];
dennyem 0:7b654820260e 208 } else {
dennyem 0:7b654820260e 209 f++;
dennyem 0:7b654820260e 210 i = 0;
dennyem 0:7b654820260e 211 while(LongMonthNames[dt.date.month - 1][i] != 0)
dennyem 0:7b654820260e 212 *dest++ = LongMonthNames[dt.date.month - 1][i++];
dennyem 0:7b654820260e 213 }
dennyem 0:7b654820260e 214 }
dennyem 0:7b654820260e 215 }
dennyem 0:7b654820260e 216 break;
dennyem 0:7b654820260e 217 case 'y':
dennyem 0:7b654820260e 218 if(*(f+1) == 'y') {
dennyem 0:7b654820260e 219 f++; //We have at least a 'yy'
dennyem 0:7b654820260e 220 if(*(f+1) == 'y' && *(f+2) == 'y') { //'yyyy' - 4 digit year
dennyem 0:7b654820260e 221 dest += Bcd2Char(dest, dt.date.century, true);
dennyem 0:7b654820260e 222 f += 2;
dennyem 0:7b654820260e 223 }
dennyem 0:7b654820260e 224 dest += Bcd2Char(dest, dt.date.year, true);
dennyem 0:7b654820260e 225 }
dennyem 0:7b654820260e 226 break;
dennyem 0:7b654820260e 227 case 'h':
dennyem 0:7b654820260e 228 if(*(f+1) != 'h') { //'h' - Hour with no leading zero
dennyem 0:7b654820260e 229 dest += Bcd2Char(dest, dt.time.hours, false);
dennyem 0:7b654820260e 230 } else {
dennyem 0:7b654820260e 231 f++;
dennyem 0:7b654820260e 232 dest += Bcd2Char(dest, dt.time.hours, true);
dennyem 0:7b654820260e 233 }
dennyem 0:7b654820260e 234 break;
dennyem 0:7b654820260e 235 case 'n':
dennyem 0:7b654820260e 236 if(*(f+1) != 'n') { //'m' - Minutes with no leading zero
dennyem 0:7b654820260e 237 dest += Bcd2Char(dest, dt.time.minutes, false);
dennyem 0:7b654820260e 238 } else {
dennyem 0:7b654820260e 239 f++;
dennyem 0:7b654820260e 240 dest += Bcd2Char(dest, dt.time.minutes, true);
dennyem 0:7b654820260e 241 }
dennyem 0:7b654820260e 242 break;
dennyem 0:7b654820260e 243 case 's':
dennyem 0:7b654820260e 244 if(*(f+1) != 's') { //'s' - Seconds with no leading zero
dennyem 0:7b654820260e 245 dest += Bcd2Char(dest, dt.time.seconds, false);
dennyem 0:7b654820260e 246 } else {
dennyem 0:7b654820260e 247 f++;
dennyem 0:7b654820260e 248 dest += Bcd2Char(dest, dt.time.seconds, true);
dennyem 0:7b654820260e 249 }
dennyem 0:7b654820260e 250 break;
dennyem 0:7b654820260e 251 case 'z':
dennyem 0:7b654820260e 252 if(*(f+1) != 'z') { //'z' - Hundredths with no leading zero
dennyem 0:7b654820260e 253 dest += Bcd2Char(dest, dt.time.hundreds, false);
dennyem 0:7b654820260e 254 } else {
dennyem 0:7b654820260e 255 f++;
dennyem 0:7b654820260e 256 dest += Bcd2Char(dest, dt.time.hundreds, true);
dennyem 0:7b654820260e 257 }
dennyem 0:7b654820260e 258 break;
dennyem 0:7b654820260e 259 case '/':
dennyem 0:7b654820260e 260 *dest++ = DateSeparator;
dennyem 0:7b654820260e 261 break;
dennyem 0:7b654820260e 262 case ':':
dennyem 0:7b654820260e 263 *dest++ = TimeSeparator;
dennyem 0:7b654820260e 264 break;
dennyem 0:7b654820260e 265 case 39 :
dennyem 0:7b654820260e 266 while(*++f != 0 && *f != 39) *dest++ = *f;
dennyem 0:7b654820260e 267 break; //Ignore the first '
dennyem 0:7b654820260e 268 default:
dennyem 0:7b654820260e 269 *dest++ = *f;
dennyem 0:7b654820260e 270 break; //Anything we don't recognise, return it
dennyem 0:7b654820260e 271 }
dennyem 0:7b654820260e 272 f++;
dennyem 0:7b654820260e 273 }
dennyem 0:7b654820260e 274 }
dennyem 0:7b654820260e 275 *dest = 0; //Null terminate
dennyem 0:7b654820260e 276 };
dennyem 0:7b654820260e 277
dennyem 0:7b654820260e 278 bool PCF8583rtc::WriteNVram(char address, char *value, char num)
dennyem 0:7b654820260e 279 {
dennyem 0:7b654820260e 280 char buf[252];
dennyem 0:7b654820260e 281
dennyem 0:7b654820260e 282 buf[0] = address;
dennyem 0:7b654820260e 283 memcpy(&buf[1], value, num);
dennyem 0:7b654820260e 284
dennyem 0:7b654820260e 285 if((address < USER_REG) || (num == 0)) // dont allow overwriting first 2 bytes
dennyem 0:7b654820260e 286 return false;
dennyem 0:7b654820260e 287
dennyem 0:7b654820260e 288 _i2c->write(_I2cAddress, buf, num + 1); // write the data
dennyem 0:7b654820260e 289 _i2c->stop();
dennyem 0:7b654820260e 290
dennyem 0:7b654820260e 291 return true;
dennyem 0:7b654820260e 292 };
dennyem 0:7b654820260e 293
dennyem 0:7b654820260e 294 bool PCF8583rtc::ReadNVram(char address, char * dest, char num)
dennyem 0:7b654820260e 295 {
dennyem 0:7b654820260e 296 char buf[2];
dennyem 0:7b654820260e 297
dennyem 0:7b654820260e 298 if((address < USER_REG) || (num == 0)) // dont allow overwriting first 2 user bytes
dennyem 0:7b654820260e 299 return false;
dennyem 0:7b654820260e 300
dennyem 0:7b654820260e 301 buf[0] = address;
dennyem 0:7b654820260e 302 _i2c->write(_I2cAddress, buf, 1); // set the rom address
dennyem 0:7b654820260e 303 _i2c->read(_I2cAddress | 1, dest, num); // read the data
dennyem 0:7b654820260e 304 _i2c->stop();
dennyem 0:7b654820260e 305
dennyem 0:7b654820260e 306 return true;
dennyem 0:7b654820260e 307 };
dennyem 0:7b654820260e 308
dennyem 0:7b654820260e 309 /*****************************************************************************/
dennyem 0:7b654820260e 310 /************************** Private Functions ********************************/
dennyem 0:7b654820260e 311 /*****************************************************************************/
dennyem 0:7b654820260e 312
dennyem 0:7b654820260e 313 char PCF8583rtc::Bcd2Char(char *d, char val, char WantLeadZero)
dennyem 0:7b654820260e 314 {
dennyem 0:7b654820260e 315 char n = 0;
dennyem 0:7b654820260e 316
dennyem 0:7b654820260e 317 if(WantLeadZero == true || (val / 10) != 0) {
dennyem 0:7b654820260e 318 *d++ = (val / 10) + 48;
dennyem 0:7b654820260e 319 n++;
dennyem 0:7b654820260e 320 }
dennyem 0:7b654820260e 321 *d = (val % 10) + 48;
dennyem 0:7b654820260e 322 return(n + 1);
dennyem 0:7b654820260e 323 }
dennyem 0:7b654820260e 324
dennyem 0:7b654820260e 325 //----------------------------------------------
dennyem 0:7b654820260e 326 // This function converts an 8 bit binary value to a 1 byte BCD value.
dennyem 0:7b654820260e 327 // The input range must be from 0 to 99.
dennyem 0:7b654820260e 328 char PCF8583rtc::bin2bcd(char value)
dennyem 0:7b654820260e 329 {
dennyem 0:7b654820260e 330 int tmp = 0;
dennyem 0:7b654820260e 331
dennyem 0:7b654820260e 332 while(1) {
dennyem 0:7b654820260e 333 // Get the tens digit by doing multiple subtraction
dennyem 0:7b654820260e 334 // of 10 from the binary value.
dennyem 0:7b654820260e 335 if(value >= 10) {
dennyem 0:7b654820260e 336 value -= 10;
dennyem 0:7b654820260e 337 tmp += 0x10;
dennyem 0:7b654820260e 338 } else { // Get the ones digit by adding the remainder.
dennyem 0:7b654820260e 339 tmp += value;
dennyem 0:7b654820260e 340 break;
dennyem 0:7b654820260e 341 }
dennyem 0:7b654820260e 342 }
dennyem 0:7b654820260e 343 return tmp;
dennyem 0:7b654820260e 344 }
dennyem 0:7b654820260e 345
dennyem 0:7b654820260e 346 void PCF8583rtc::configureControlReg(char control)
dennyem 0:7b654820260e 347 {
dennyem 0:7b654820260e 348 writeByte(0, control);
dennyem 0:7b654820260e 349 }
dennyem 0:7b654820260e 350
dennyem 0:7b654820260e 351 void PCF8583rtc::configureAlarmReg(char alarm)
dennyem 0:7b654820260e 352 {
dennyem 0:7b654820260e 353 writeByte(0x08, alarm);
dennyem 0:7b654820260e 354 }
dennyem 0:7b654820260e 355
dennyem 0:7b654820260e 356 void PCF8583rtc::writeByte(char address, char d)
dennyem 0:7b654820260e 357 {
dennyem 0:7b654820260e 358 char buf[2];
dennyem 0:7b654820260e 359
dennyem 0:7b654820260e 360 buf[0] = address;
dennyem 0:7b654820260e 361 buf[1] = d;
dennyem 0:7b654820260e 362 _i2c->write(_I2cAddress, buf, 2); // Address PCF8583, see PCF8583 datasheet
dennyem 0:7b654820260e 363 _i2c->stop();
dennyem 0:7b654820260e 364 }
dennyem 0:7b654820260e 365
dennyem 0:7b654820260e 366 char PCF8583rtc::readByte(char address)
dennyem 0:7b654820260e 367 {
dennyem 0:7b654820260e 368 char buf[2];
dennyem 0:7b654820260e 369
dennyem 0:7b654820260e 370 buf[0] = address;
dennyem 0:7b654820260e 371 _i2c->write(_I2cAddress, buf, 1);
dennyem 0:7b654820260e 372 _i2c->read(_I2cAddress | 1, buf, 1);
dennyem 0:7b654820260e 373 _i2c->stop();
dennyem 0:7b654820260e 374
dennyem 0:7b654820260e 375 return buf[0];
dennyem 0:7b654820260e 376 }
dennyem 0:7b654820260e 377
dennyem 0:7b654820260e 378 void PCF8583rtc::pauseCounting()
dennyem 0:7b654820260e 379 {
dennyem 0:7b654820260e 380 char tmp;
dennyem 0:7b654820260e 381 tmp = readByte(0);
dennyem 0:7b654820260e 382 tmp = tmp | 0x80;
dennyem 0:7b654820260e 383 writeByte(0, tmp);
dennyem 0:7b654820260e 384 }
dennyem 0:7b654820260e 385
dennyem 0:7b654820260e 386 void PCF8583rtc::enableCounting()
dennyem 0:7b654820260e 387 {
dennyem 0:7b654820260e 388 char tmp;
dennyem 0:7b654820260e 389 tmp = readByte(0);
dennyem 0:7b654820260e 390 tmp = tmp ^ 0x80;
dennyem 0:7b654820260e 391 writeByte(0, tmp);
dennyem 0:7b654820260e 392 }