Arduino से I2C तक PCF8563 रियल-टाइम घड़ी के मित्र

 #include "Wire.h" #define PCF8563address 0x51 byte second, minute, hour, dayOfWeek, dayOfMonth, month, year; byte alarmMinute, alarmHour, alarmDay, alarmDayOfWeek; String days[] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" }; byte bcdToDec(byte value) { return ((value / 16) * 10 + value % 16); } byte decToBcd(byte value){ return (value / 10 * 16 + value % 10); } //        void setPCF8563alarm() { byte am, ah, ad, adow; am = decToBcd(alarmMinute); am = am | 100000000; //       ah = decToBcd(alarmHour); ah = ah | 100000000; //       ad = decToBcd(alarmDay); ad = ad | 100000000; //        adow = decToBcd(alarmDayOfWeek); adow = ad | 100000000; //       //        PCF8563 Wire.beginTransmission(PCF8563address); Wire.write(0x09); Wire.write(am); Wire.write(ah); // .         /* Wire.write(ad); Wire.write(adow); */ Wire.endTransmission(); //  .  INT     //     PCF8563alarmOff() Wire.beginTransmission(PCF8563address); Wire.write(0x01); Wire.write(B00000010); Wire.endTransmission(); } void PCF8563alarmOff() //      . { byte test; //    0x01h Wire.beginTransmission(PCF8563address); Wire.write(0x01); Wire.endTransmission(); Wire.requestFrom(PCF8563address, 1); test = Wire.read(); //  3    0 test = test - B00001000; //      0x01h Wire.beginTransmission(PCF8563address); Wire.write(0x01); Wire.write(test); Wire.endTransmission(); } void checkPCF8563alarm() //    { byte test; //    0x01h     test Wire.beginTransmission(PCF8563address); Wire.write(0x01); Wire.endTransmission(); Wire.requestFrom(PCF8563address, 1); test = Wire.read(); test = test & B00001000; if (test == B00001000) //    { Serial.println("** alarm **"); delay(2000); //     PCF8563alarmOff(); } } void setPCF8563() { Wire.beginTransmission(PCF8563address); Wire.write(0x02); Wire.write(decToBcd(second)); Wire.write(decToBcd(minute)); Wire.write(decToBcd(hour)); Wire.write(decToBcd(dayOfMonth)); Wire.write(decToBcd(dayOfWeek)); Wire.write(decToBcd(month)); Wire.write(decToBcd(year)); Wire.endTransmission(); } void readPCF8563() { Wire.beginTransmission(PCF8563address); Wire.write(0x02); Wire.endTransmission(); Wire.requestFrom(PCF8563address, 7); second = bcdToDec(Wire.read() & B01111111); minute = bcdToDec(Wire.read() & B01111111); hour = bcdToDec(Wire.read() & B00111111); dayOfMonth = bcdToDec(Wire.read() & B00111111); dayOfWeek = bcdToDec(Wire.read() & B00000111); month = bcdToDec(Wire.read() & B00011111); year = bcdToDec(Wire.read()); } void setup() { Wire.begin(); Serial.begin(9600); second = 50; minute = 44; hour = 13; dayOfWeek = 1; dayOfMonth = 19; month = 8; year = 13; setPCF8563(); //       alarmMinute = 45; alarmHour = 13; setPCF8563alarm(); } void loop() { readPCF8563(); Serial.print(days[dayOfWeek]); Serial.print(" "); Serial.print(dayOfMonth, DEC); Serial.print("/"); Serial.print(month, DEC); Serial.print("/20"); Serial.print(year, DEC); Serial.print(" - "); Serial.print(hour, DEC); Serial.print(":"); if (minute < 10) { Serial.print("0"); } Serial.print(minute, DEC); Serial.print(":"); if (second < 10) { Serial.print("0"); } Serial.println(second, DEC); delay(1000); //  checkPCF8563alarm(); }