DPPU / PCF8523

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PCF8523.cpp@1:41dd31bbbe6d, 2020-06-18 (annotated)

Committer:
irsanjul
Date:
Thu Jun 18 08:57:58 2020 +0000
Revision:
1:41dd31bbbe6d
Parent:
0:b7ac3add7d83 
pcf8523

Who changed what in which revision?

UserRevisionLine numberNew contents of line
irsanjul 0:b7ac3add7d83 1 #include "mbed.h"
irsanjul 0:b7ac3add7d83 2 #include "PCF8523.h"
irsanjul 0:b7ac3add7d83 3
irsanjul 0:b7ac3add7d83 4 extern Serial dbg;
irsanjul 0:b7ac3add7d83 5
irsanjul 0:b7ac3add7d83 6 PCF8523::PCF8523(PinName sda, PinName scl) : i2c (sda, scl)
irsanjul 0:b7ac3add7d83 7 {
irsanjul 0:b7ac3add7d83 8 i2c.frequency(100000);
irsanjul 0:b7ac3add7d83 9 }
irsanjul 0:b7ac3add7d83 10
irsanjul 0:b7ac3add7d83 11 PCF8523::~PCF8523()
irsanjul 0:b7ac3add7d83 12 {
irsanjul 0:b7ac3add7d83 13
irsanjul 0:b7ac3add7d83 14 }
irsanjul 0:b7ac3add7d83 15
irsanjul 0:b7ac3add7d83 16 bool PCF8523::write(char adr, char data)
irsanjul 0:b7ac3add7d83 17 {
irsanjul 0:b7ac3add7d83 18 w[0] = adr;
irsanjul 0:b7ac3add7d83 19 w[1] = data;
irsanjul 0:b7ac3add7d83 20 if (i2c.write(address, w, 2) != 0) return 0;
irsanjul 0:b7ac3add7d83 21
irsanjul 0:b7ac3add7d83 22 return true;
irsanjul 0:b7ac3add7d83 23 }
irsanjul 0:b7ac3add7d83 24
irsanjul 0:b7ac3add7d83 25 char PCF8523::read(char adr)
irsanjul 0:b7ac3add7d83 26 {
irsanjul 0:b7ac3add7d83 27 char start = adr;
irsanjul 0:b7ac3add7d83 28 if (i2c.write(address, &start, 1, true) != 0) return 0;
irsanjul 0:b7ac3add7d83 29 if (i2c.read(address, r, 1) != 0) return 0;
irsanjul 0:b7ac3add7d83 30
irsanjul 0:b7ac3add7d83 31 return r[0];
irsanjul 0:b7ac3add7d83 32 }
irsanjul 0:b7ac3add7d83 33
irsanjul 0:b7ac3add7d83 34 time_t PCF8523::now()
irsanjul 0:b7ac3add7d83 35 {
irsanjul 0:b7ac3add7d83 36 struct tm now;
irsanjul 0:b7ac3add7d83 37
irsanjul 0:b7ac3add7d83 38 char buffer[6];
irsanjul 0:b7ac3add7d83 39
irsanjul 0:b7ac3add7d83 40 buffer [0] = read(SEC);
irsanjul 0:b7ac3add7d83 41 buffer [1] = read(MIN);
irsanjul 0:b7ac3add7d83 42 buffer [2] = read(HOUR);
irsanjul 0:b7ac3add7d83 43 buffer [3] = read(DAY);
irsanjul 0:b7ac3add7d83 44 buffer [4] = read(MONTH);
irsanjul 0:b7ac3add7d83 45 buffer [5] = read(YEAR);
irsanjul 0:b7ac3add7d83 46
irsanjul 0:b7ac3add7d83 47 now.tm_sec = bcdToDecimal(buffer[0] & 0x7F);
irsanjul 0:b7ac3add7d83 48 now.tm_min = bcdToDecimal(buffer[1] & 0x7F);
irsanjul 0:b7ac3add7d83 49 now.tm_hour = bcdToDecimal(buffer[2] & 0x3F);
irsanjul 0:b7ac3add7d83 50 now.tm_mday = bcdToDecimal(buffer[3] & 0x3F);
irsanjul 0:b7ac3add7d83 51 now.tm_mon = bcdToDecimal(buffer[4] & 0x1F) - 1;
irsanjul 0:b7ac3add7d83 52 now.tm_year = bcdToDecimal(buffer[5] & 0xFF) + 2000 - 1900;
irsanjul 0:b7ac3add7d83 53
irsanjul 0:b7ac3add7d83 54 return mktime(&now);
irsanjul 0:b7ac3add7d83 55 }
irsanjul 0:b7ac3add7d83 56
irsanjul 0:b7ac3add7d83 57 bool PCF8523::set_time(time_t time)
irsanjul 0:b7ac3add7d83 58 {
irsanjul 0:b7ac3add7d83 59 struct tm *now;
irsanjul 0:b7ac3add7d83 60 char buffer[9];
irsanjul 0:b7ac3add7d83 61
irsanjul 0:b7ac3add7d83 62 now = localtime(&time);
irsanjul 0:b7ac3add7d83 63
irsanjul 0:b7ac3add7d83 64 buffer[0] = decimalToBcd(now->tm_sec) & 0x7F; // VL = 0
irsanjul 0:b7ac3add7d83 65 buffer[1] = decimalToBcd(now->tm_min) & 0x7F;
irsanjul 0:b7ac3add7d83 66 buffer[2] = decimalToBcd(now->tm_hour) & 0x3F;
irsanjul 0:b7ac3add7d83 67 buffer[3] = decimalToBcd(now->tm_mday) & 0x3F;
irsanjul 0:b7ac3add7d83 68 buffer[4] = now->tm_wday + 1;
irsanjul 0:b7ac3add7d83 69 buffer[5] = decimalToBcd(now->tm_mon+1) & 0x1F;
irsanjul 0:b7ac3add7d83 70 buffer[6] = decimalToBcd(now->tm_year + 1900 - 2000);
irsanjul 0:b7ac3add7d83 71
irsanjul 0:b7ac3add7d83 72 if(!write(SEC, buffer[0]))return 0;
irsanjul 0:b7ac3add7d83 73 if(!write(MIN, buffer[1]))return 0;
irsanjul 0:b7ac3add7d83 74 if(!write(HOUR, buffer[2]))return 0;
irsanjul 0:b7ac3add7d83 75 if(!write(DAY, buffer[3]))return 0;
irsanjul 0:b7ac3add7d83 76 if(!write(WDAY, buffer[4]))return 0;
irsanjul 0:b7ac3add7d83 77 if(!write(MONTH, buffer[5]))return 0;
irsanjul 0:b7ac3add7d83 78 if(!write(YEAR, buffer[6]))return 0;
irsanjul 0:b7ac3add7d83 79
irsanjul 0:b7ac3add7d83 80 return true;
irsanjul 0:b7ac3add7d83 81 }
irsanjul 0:b7ac3add7d83 82
irsanjul 1:41dd31bbbe6d 83 bool PCF8523::Initialize(char adr, uint8_t val)
irsanjul 1:41dd31bbbe6d 84 {
irsanjul 1:41dd31bbbe6d 85 char buffer[4];
irsanjul 1:41dd31bbbe6d 86 buffer[0] = val;
irsanjul 1:41dd31bbbe6d 87 if(!write(adr, buffer[0]))return 0;
irsanjul 1:41dd31bbbe6d 88
irsanjul 1:41dd31bbbe6d 89 return true;
irsanjul 1:41dd31bbbe6d 90 }
irsanjul 1:41dd31bbbe6d 91
irsanjul 0:b7ac3add7d83 92 bool PCF8523::IsConnected()
irsanjul 0:b7ac3add7d83 93 {
irsanjul 0:b7ac3add7d83 94 bool ok = false;
irsanjul 0:b7ac3add7d83 95
irsanjul 0:b7ac3add7d83 96 i2c.start();
irsanjul 0:b7ac3add7d83 97 i2c.stop();
irsanjul 0:b7ac3add7d83 98
irsanjul 0:b7ac3add7d83 99 if (i2c.read(address, &data[0], 1) != 0)
irsanjul 0:b7ac3add7d83 100 {
irsanjul 0:b7ac3add7d83 101 dbg.printf("PCF8523 is not detected\r\n");
irsanjul 0:b7ac3add7d83 102 ok = false;
irsanjul 0:b7ac3add7d83 103 }
irsanjul 0:b7ac3add7d83 104 else
irsanjul 0:b7ac3add7d83 105 {
irsanjul 0:b7ac3add7d83 106 dbg.printf("PCF8523 is detected\r\n");
irsanjul 0:b7ac3add7d83 107 ok = true;
irsanjul 0:b7ac3add7d83 108 }
irsanjul 0:b7ac3add7d83 109
irsanjul 0:b7ac3add7d83 110 data[0] = 0;
irsanjul 0:b7ac3add7d83 111 i2c.start();
irsanjul 0:b7ac3add7d83 112 i2c.stop();
irsanjul 0:b7ac3add7d83 113
irsanjul 0:b7ac3add7d83 114 return ok;
irsanjul 0:b7ac3add7d83 115 }
irsanjul 0:b7ac3add7d83 116
irsanjul 0:b7ac3add7d83 117 bool PCF8523::set_alarm(const struct tm &now, bool min_en, bool hour_en, bool mday_en)
irsanjul 0:b7ac3add7d83 118 {
irsanjul 0:b7ac3add7d83 119 /*
irsanjul 0:b7ac3add7d83 120 // Alarm register | Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
irsanjul 0:b7ac3add7d83 121 CTRL1 = 0x00, // Ctrl 1 |Cap Sel| T | Stop | SR | 12-24 | SIE | AIE | CIE |
irsanjul 0:b7ac3add7d83 122
irsanjul 0:b7ac3add7d83 123 MINALARM = 0x0A, // Minute | AEN_M | ( 0 - 59 ) |
irsanjul 0:b7ac3add7d83 124 HOURALARM = 0x0B, // Hour | AEN_H | X | ( 0 - 23 ) |
irsanjul 0:b7ac3add7d83 125 // Hour | AEN_H | X | AM/PM | ( 1 - 12 ) |
irsanjul 0:b7ac3add7d83 126 DAYALARM = 0x0C, // Day | AEN_D | X | ( 1 - 31 ) |
irsanjul 0:b7ac3add7d83 127 WDAYALARM = 0x0D, // Day of week | AEN_W | X | X | X | X | ( 0 - 6 ) |
irsanjul 0:b7ac3add7d83 128
irsanjul 0:b7ac3add7d83 129 AEN_M, AEN_H, AEN_D, AEN_W => 0 = enable; 1 = disable
irsanjul 0:b7ac3add7d83 130 */
irsanjul 0:b7ac3add7d83 131
irsanjul 0:b7ac3add7d83 132 char buffer[3] = {0x00, 0x00, 0x00};
irsanjul 0:b7ac3add7d83 133
irsanjul 0:b7ac3add7d83 134 // if(now.tm_min >= 60)
irsanjul 0:b7ac3add7d83 135 // now.tm_min = 0;
irsanjul 0:b7ac3add7d83 136 //
irsanjul 0:b7ac3add7d83 137 // if(now.tm_hour >= 24)
irsanjul 0:b7ac3add7d83 138 // now.tm_hour = 0;
irsanjul 0:b7ac3add7d83 139 //
irsanjul 0:b7ac3add7d83 140 // if(now.tm_mday >= 32)
irsanjul 0:b7ac3add7d83 141 // now.tm_mday = 1;
irsanjul 0:b7ac3add7d83 142 //
irsanjul 0:b7ac3add7d83 143 if(min_en)
irsanjul 0:b7ac3add7d83 144 {
irsanjul 0:b7ac3add7d83 145 buffer[0] = (decimalToBcd(now.tm_min) & 0x7F);
irsanjul 0:b7ac3add7d83 146 if(!write(MINALARM, buffer[0]))return 0;
irsanjul 0:b7ac3add7d83 147 }
irsanjul 0:b7ac3add7d83 148 else
irsanjul 0:b7ac3add7d83 149 {
irsanjul 0:b7ac3add7d83 150 buffer[0] = (decimalToBcd(now.tm_min) | 0x80);
irsanjul 0:b7ac3add7d83 151 if(!write(MINALARM, buffer[0]))return 0;
irsanjul 0:b7ac3add7d83 152 }
irsanjul 0:b7ac3add7d83 153
irsanjul 0:b7ac3add7d83 154 if(hour_en)
irsanjul 0:b7ac3add7d83 155 {
irsanjul 0:b7ac3add7d83 156 buffer[1] = (decimalToBcd(now.tm_hour) & 0x3F);
irsanjul 0:b7ac3add7d83 157 if(!write(HOURALARM, buffer[1]))return 0;
irsanjul 0:b7ac3add7d83 158 }
irsanjul 0:b7ac3add7d83 159 else
irsanjul 0:b7ac3add7d83 160 {
irsanjul 0:b7ac3add7d83 161 buffer[1] = (decimalToBcd(now.tm_hour) | 0x80);
irsanjul 0:b7ac3add7d83 162 if(!write(HOURALARM, buffer[1]))return 0;
irsanjul 0:b7ac3add7d83 163 }
irsanjul 0:b7ac3add7d83 164
irsanjul 0:b7ac3add7d83 165 if(mday_en)
irsanjul 0:b7ac3add7d83 166 {
irsanjul 0:b7ac3add7d83 167 buffer[2] = (decimalToBcd(now.tm_mday) & 0x3F);
irsanjul 0:b7ac3add7d83 168 if(!write(DAYALARM, buffer[2]))return 0;
irsanjul 0:b7ac3add7d83 169 }
irsanjul 0:b7ac3add7d83 170 else
irsanjul 0:b7ac3add7d83 171 {
irsanjul 0:b7ac3add7d83 172 buffer[2] = (decimalToBcd(now.tm_mday) | 0x80);
irsanjul 0:b7ac3add7d83 173 if(!write(DAYALARM, buffer[2]))return 0;
irsanjul 0:b7ac3add7d83 174 }
irsanjul 0:b7ac3add7d83 175 return true;
irsanjul 0:b7ac3add7d83 176 }
irsanjul 0:b7ac3add7d83 177
irsanjul 0:b7ac3add7d83 178 bool PCF8523::enable_alarm(bool enable)
irsanjul 0:b7ac3add7d83 179 {
irsanjul 0:b7ac3add7d83 180 char buffer = read(CTRL1);
irsanjul 0:b7ac3add7d83 181
irsanjul 0:b7ac3add7d83 182 if(enable)
irsanjul 0:b7ac3add7d83 183 {
irsanjul 0:b7ac3add7d83 184 // Disable Clockout & other Timers
irsanjul 0:b7ac3add7d83 185 if(!write(TMRCLKOUT, 0x38))
irsanjul 0:b7ac3add7d83 186
irsanjul 0:b7ac3add7d83 187 // Clear any existing flags
irsanjul 0:b7ac3add7d83 188 alarm_off(0x08);
irsanjul 0:b7ac3add7d83 189
irsanjul 0:b7ac3add7d83 190 // enable AIE bit
irsanjul 0:b7ac3add7d83 191 buffer = buffer | 0x02;
irsanjul 0:b7ac3add7d83 192 }
irsanjul 0:b7ac3add7d83 193 else
irsanjul 0:b7ac3add7d83 194 {
irsanjul 0:b7ac3add7d83 195 buffer &= ~0x02;
irsanjul 0:b7ac3add7d83 196 }
irsanjul 0:b7ac3add7d83 197
irsanjul 0:b7ac3add7d83 198 if(!write(CTRL1, buffer)) return 0;
irsanjul 0:b7ac3add7d83 199
irsanjul 0:b7ac3add7d83 200 return true;
irsanjul 0:b7ac3add7d83 201 }
irsanjul 0:b7ac3add7d83 202
irsanjul 0:b7ac3add7d83 203 bool PCF8523::alarm_off(char buffer)
irsanjul 0:b7ac3add7d83 204 {
irsanjul 0:b7ac3add7d83 205 // clear AF flag
irsanjul 0:b7ac3add7d83 206 buffer = buffer - 0x08;
irsanjul 0:b7ac3add7d83 207
irsanjul 0:b7ac3add7d83 208 if(!write(CTRL2, buffer))return 0;
irsanjul 0:b7ac3add7d83 209
irsanjul 0:b7ac3add7d83 210 return true;
irsanjul 0:b7ac3add7d83 211 }
irsanjul 0:b7ac3add7d83 212
irsanjul 0:b7ac3add7d83 213 bool PCF8523::check_alarm()
irsanjul 0:b7ac3add7d83 214 {
irsanjul 0:b7ac3add7d83 215 char buffer;
irsanjul 0:b7ac3add7d83 216
irsanjul 0:b7ac3add7d83 217 buffer = read(CTRL2);
irsanjul 0:b7ac3add7d83 218
irsanjul 0:b7ac3add7d83 219 if(buffer & 0x08)
irsanjul 0:b7ac3add7d83 220 {
irsanjul 0:b7ac3add7d83 221 if(alarm_off(buffer))
irsanjul 0:b7ac3add7d83 222 return true;
irsanjul 0:b7ac3add7d83 223 else return 0;
irsanjul 0:b7ac3add7d83 224 }
irsanjul 0:b7ac3add7d83 225 else return 0;
irsanjul 0:b7ac3add7d83 226 }
irsanjul 0:b7ac3add7d83 227
irsanjul 0:b7ac3add7d83 228 bool PCF8523::software_reset()
irsanjul 0:b7ac3add7d83 229 {
irsanjul 0:b7ac3add7d83 230 char buffer = 0x58;
irsanjul 0:b7ac3add7d83 231
irsanjul 0:b7ac3add7d83 232 if(!write(CTRL1, buffer)) return 0;
irsanjul 0:b7ac3add7d83 233
irsanjul 0:b7ac3add7d83 234 return 1;
irsanjul 0:b7ac3add7d83 235 }