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Driver RTC MCP79411

 
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dpechman



Joined: 04 Dec 2007
Posts: 43

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Driver RTC MCP79411
PostPosted: Thu Jul 02, 2015 8:11 am     Reply with quote
Code:

////////////////////////////////////////////////////////////////////////////////
///                             MCP79411.h                                   
///                     Driver for Real Time Clock                           
///                                                                         
/// Daniel Pechmann                                                         
///                                                                         
/// Data: 22/05/2012 First Release                                           
///                                                                         
/// rtc_init() - Enable oscillator without clearing the seconds register -   
///                 used when PIC loses power and rtc run from 3V BAT       
///            - Disable squarewave output                                   
///                                                                         
/// rtc_set_date_time(day,mth,year,dow,hour,min,sec)  Set the date/time     
///                                                                         
/// rtc_get_date(day,mth,year,dow)               Get the date               
///                                                                         
/// rtc_get_time(hr,min,sec)                     Get the time               
///                                                                         
/// rtc_get_mac(BYTE &mc5, ..., BYTE &mc0)       Get MAC Address             
///                                                                         
/// rtc_get_powerdown(BYTE &min, ..., BYTE &mth) Get timestamp of powerdown 
///                                                                         
/// rtc_get_powerup(BYTE &min, ..., BYTE &mth)   Get timestamp of powerup   
///                                                                         
/// rtc_set_alarm0(BYTE sec, ..., BYTE mth)      Adjust Alarm0               
///                                                                         
/// rtc_set_alarm1(BYTE sec, ..., BYTE mth)      Adjust Alarm1               
///                                                                         
/// void rtc_write_byte(...)                     Write byte anywhere in rtc
///                                                                         
/// void rtc_read_byte(...)                      Read byte anywhere in rtc   
///                                                                         
////////////////////////////////////////////////////////////////////////////////

#define RTC_SDA  PIN_C4
#define RTC_SCL  PIN_C3

#define  ADDR_EEPROM_WRITE 0xae       //  DEVICE ADDR for EEPROM (writes)   
#define  ADDR_EEPROM_READ  0xaf       //  DEVICE ADDR for EEPROM (reads) 
#define  ADDR_RTCC_WRITE   0xde       //  DEVICE ADDR for RTCC MCHP  (writes)
#define  ADDR_RTCC_READ    0xdf

#define  ADDR_UNIQUE_ID    0xf2

#define  SRAM_PTR          0x20       //  pointer of the SRAM area (RTCC)
#define  ADDR_EEPROM_SR    0xff       //  STATUS REGISTER in the  EEPROM

#define  ADDR_SEC          0x00       //  address of SECONDS      register
#define  ADDR_MIN          0x01       //  address of MINUTES      register
#define  ADDR_HOUR         0x02       //  address of HOURS        register
#define  ADDR_DAY          0x03       //  address of DAY OF WEEK  register
#define  ADDR_STAT         0x03       //  address of STATUS       register
#define  ADDR_DATE         0x04       //  address of DATE         register 
#define  ADDR_MNTH         0x05       //  address of MONTH        register
#define  ADDR_YEAR         0x06       //  address of YEAR         register
#define  ADDR_CTRL         0x07       //  address of CONTROL      register
#define  ADDR_CAL          0x08       //  address of CALIB        register
#define  ADDR_ULID         0x09       //  address of UNLOCK ID    register

#define  ADDR_ALM0SEC      0x0a       //  address of ALARMO SEC   register
#define  ADDR_ALM0MIN      0x0b       //  address of ALARMO MIN   register
#define  ADDR_ALM0HR       0x0c       //  address of ALARMO HOUR  register
#define  ADDR_ALM0CTL      0x0d       //  address of ALARM0 CONTR register
#define  ADDR_ALM0DAT      0x0e       //  address of ALARMO DATE  register
#define  ADDR_ALM0MTH      0x0f       //  address of ALARMO MONTH register

#define  ADDR_ALM1SEC      0x11       //  address of ALARM1 SEC   register
#define  ADDR_ALM1MIN      0x12       //  address of ALARM1 MIN   register
#define  ADDR_ALM1HR       0x13       //  address of ALARM1 HOUR  register
#define  ADDR_ALM1CTL      0x14       //  address of ALARM1 CONTR register
#define  ADDR_ALM1DAT      0x15       //  address of ALARM1 DATE  register
#define  ADDR_ALM1MTH      0x16       //  address of ALARM1 MONTH register
       
#define  ADDR_SAVtoBAT_MIN 0x18       //  address of T_SAVER MIN(VDD->BAT)
#define  ADDR_SAVtoBAT_HR  0x19       //  address of T_SAVER HR (VDD->BAT)
#define  ADDR_SAVtoBAT_DAT 0x1a       //  address of T_SAVER DAT(VDD->BAT)
#define  ADDR_SAVtoBAT_MTH 0x1b       //  address of T_SAVER MTH(VDD->BAT)

#define  ADDR_SAVtoVDD_MIN 0x1c       //  address of T_SAVER MIN(BAT->VDD)
#define  ADDR_SAVtoVDD_HR  0x1d       //  address of T_SAVER HR (BAT->VDD)
#define  ADDR_SAVtoVDD_DAT 0x1e       //  address of T_SAVER DAT(BAT->VDD)
#define  ADDR_SAVtoVDD_MTH 0x1f       //  address of T_SAVER MTH(BAT->VDD)       

#define  START_32KHZ       0x80       //  start crystal: ST = b7 (ADDR_SEC)
#define  LP                0x20       //  mask for the leap year bit(MONTH REG)   
#define  HOUR_12           0x40       //  12 hours format   (ADDR_HOUR)   
#define  PM                0x20       //  post-meridian bit (ADDR_HOUR)
#define  OUT_PIN           0x80       //  = b7 (ADDR_CTRL)
#define  SQWE              0x40       //  SQWE = b6 (ADDR_CTRL)
#define  ALM_NO            0x00       //  no alarm activated        (ADDR_CTRL)
#define  ALM_0             0x10       //  ALARM0 is       activated (ADDR_CTRL)
#define  ALM_1             0x20       //  ALARM1 is       activated (ADDR_CTRL)
#define  ALM_01            0x30       //  both alarms are activated (ADDR_CTRL)
#define  MFP_01H           0x00       //  MFP = SQVAW(01 HERZ)      (ADDR_CTRL) 
#define  MFP_04K           0x01       //  MFP = SQVAW(04 KHZ)       (ADDR_CTRL) 
#define  MFP_08K           0x02       //  MFP = SQVAW(08 KHZ)       (ADDR_CTRL) 
#define  MFP_32K           0x03       //  MFP = SQVAW(32 KHZ)       (ADDR_CTRL) 
#define  MFP_64H           0x04       //  MFP = SQVAW(64 HERZ)      (ADDR_CTRL)
#define  ALMx_POL          0x80       //  polarity of MFP on alarm  (ADDR_ALMxCTL)   
#define  ALMxC_SEC         0x00       //  ALARM compare on SEC      (ADDR_ALMxCTL)             
#define  ALMxC_MIN         0x10       //  ALARM compare on MIN      (ADDR_ALMxCTL)   
#define  ALMxC_HR          0x20       //  ALARM compare on HOUR     (ADDR_ALMxCTL)   
#define  ALMxC_DAY         0x30       //  ALARM compare on DAY      (ADDR_ALMxCTL)   
#define  ALMxC_DAT         0x40       //  ALARM compare on DATE     (ADDR_ALMxCTL)   
#define  ALMxC_ALL         0x70       //  ALARM compare on all param(ADDR_ALMxCTL)   
#define  ALMx_IF           0x08       //  MASK of the ALARM_IF      (ADDR_ALMxCTL)
#define  OSCON             0x20       //  state of the oscillator(running or not)
#define  VBATEN            0x08       //  enable battery for back-up         

#use i2c(master, sda=RTC_SDA, scl=RTC_SCL, FORCE_SW, FAST)

//Prototypes
BYTE bin2bcd(BYTE binary_value);
BYTE bcd2bin(BYTE bcd_value);

// Init Real Time Clock
void rtc_Init(void)
{
   BYTE seconds = 0;

   i2c_start();
   i2c_write(ADDR_RTCC_WRITE);     // WR to RTC
   i2c_write(ADDR_SEC);                // REG 0
   i2c_start();
   i2c_write(ADDR_RTCC_READ);      // RD from RTC
   seconds = bcd2bin(i2c_read(0)); // Read current "seconds" in rtc
   i2c_stop();
   //seconds &= 0x7F;
   seconds |= 0x80; //set to 1 bit 7 of seconds(ST) enabling oscillator
   
   delay_us(3);

   i2c_start();
   i2c_write(ADDR_RTCC_WRITE);      // WR to RTC
   i2c_write(ADDR_SEC);      // REG 0
   i2c_write(bin2bcd(seconds) | 0x80);     // Start oscillator with current "seconds value
   i2c_start();
   i2c_write(ADDR_RTCC_WRITE);      // WR to RTC
   i2c_write(0x07);      // Control Register
   i2c_write(0x80);      // Disable squarewave output pin
   i2c_stop();
}

//function to set datetime
void rtc_set_date_time(BYTE day, BYTE mth, BYTE year, BYTE dow, BYTE hr, BYTE min, BYTE sec)
{
  i2c_start();
  i2c_write(ADDR_RTCC_WRITE);      // I2C write address
  i2c_write(ADDR_SEC);             // Point to start writing at REG 0 - Seconds
  i2c_write(bin2bcd(sec) | 0x80 ); // ST ON
  i2c_write(bin2bcd(min));         
  i2c_write(bin2bcd(hr));         
  i2c_write(bin2bcd(dow) | 0x08 ); // VBATEN ON
  i2c_write(bin2bcd(day));         
  i2c_write(bin2bcd(mth));       
  i2c_write(bin2bcd(year));       
  i2c_write(0x80);                 // REG 7 - Disable squarewave output pin
  //i2c_write(0x10);               // REG 4 - turn on with 1Hz the square pin
  i2c_stop();
}

void rtc_get_date(BYTE &day, BYTE &mth, BYTE &year, BYTE &dow)
{
  i2c_start();
  i2c_write(ADDR_RTCC_WRITE);
  i2c_write(0x03);                     // Start at REG 3 - Day of week
  i2c_start();
  i2c_write(ADDR_RTCC_READ);
  dow  = bcd2bin(i2c_read() & 0x07);   // REG 3
  day  = bcd2bin(i2c_read() & 0x3f);   // REG 4
  mth  = bcd2bin(i2c_read() & 0x1f);   // REG 5
  year = bcd2bin(i2c_read(0));         // REG 6
  i2c_stop();
}

void rtc_get_time(BYTE &hr, BYTE &min, BYTE &sec)
{
  i2c_start();
  i2c_write(ADDR_RTCC_WRITE);
  i2c_write(0x00);                     // Start at REG 0 - Seconds
  i2c_start();
  i2c_write(ADDR_RTCC_READ);
  sec = bcd2bin(i2c_read() & 0x7f);    //0x7f b01111111
  min = bcd2bin(i2c_read() & 0x7f);    //0x7f
  hr  = bcd2bin(i2c_read(0) & 0x3f);   //0x3f b00111111
  i2c_stop();
}

void rtc_get_mac(BYTE &mc5, BYTE &mc4, BYTE &mc3, BYTE &mc2, BYTE &mc1, BYTE &mc0)
{
  i2c_start();
  i2c_write(ADDR_EEPROM_WRITE);  //0x57
  i2c_write(ADDR_UNIQUE_ID);     // Start point ADDR_UNIQUE_ID
  i2c_start();
  i2c_write(ADDR_EEPROM_READ);
  mc5 = bcd2bin(i2c_read());   
  mc4 = bcd2bin(i2c_read());   
  mc3 = bcd2bin(i2c_read());
  mc2 = bcd2bin(i2c_read());   
  mc1 = bcd2bin(i2c_read()); 
  mc0 = bcd2bin(i2c_read(0));         
  i2c_stop();
}

void rtc_get_powerdown(BYTE &min, BYTE &hr, BYTE &dow, BYTE &date, BYTE &mth)
{
  BYTE tmp;
  i2c_start();
  i2c_write(ADDR_RTCC_WRITE);
  i2c_write(ADDR_SAVtoBAT_MIN);         // Start point ADDR_SAVtoBAT_MIN
  i2c_start();
  i2c_write(ADDR_RTCC_READ);
  min = bcd2bin(i2c_read());   
  hr  = bcd2bin(i2c_read()); 
  date = bcd2bin(i2c_read()& 0x3F);   
  tmp = i2c_read(0); 
  i2c_stop();
  mth = bcd2bin(tmp & 0x0F);
  dow = bcd2bin(tmp & 0xE0);
}

void rtc_get_powerup(BYTE &min, BYTE &hr, BYTE &dow, BYTE &date, BYTE &mth)
{
  BYTE tmp;
  i2c_start();
  i2c_write(ADDR_RTCC_WRITE);
  i2c_write(ADDR_SAVtoVDD_MIN);         // Start point ADDR_SAVtoVDD_MIN
  i2c_start();
  i2c_write(ADDR_RTCC_READ);
  min = bcd2bin(i2c_read());   
  hr  = bcd2bin(i2c_read());   
  date = bcd2bin(i2c_read()& 0x3F);   
  tmp = i2c_read(0); 
  i2c_stop();
  mth = bcd2bin(tmp & 0x0F);
  dow = bcd2bin(tmp & 0xE0); 
}

void rtc_set_alarm0(BYTE sec, BYTE min, BYTE hr, BYTE dow, BYTE day, BYTE mth) 
{
  i2c_start();
  i2c_write(ADDR_RTCC_WRITE);
  i2c_write(ADDR_ALM0SEC);            // Start point ADDR_ALM0SEC
  i2c_start();
  i2c_write(ADDR_RTCC_WRITE);
  i2c_write(bin2bcd(sec));
  i2c_write(bin2bcd(min));
  i2c_write(bin2bcd(hr));
  i2c_write(bin2bcd(dow));
  i2c_write(bin2bcd(day));
  i2c_write(bin2bcd(mth));
  i2c_stop();
}

void rtc_set_alarm1(BYTE sec, BYTE min, BYTE hr, BYTE dow, BYTE day, BYTE mth) 
{
  i2c_start();
  i2c_write(ADDR_RTCC_WRITE);
  i2c_write(ADDR_ALM1SEC);            // Start point ADDR_ALM1SEC
  i2c_start();
  i2c_write(ADDR_RTCC_WRITE);
  i2c_write(bin2bcd(sec));
  i2c_write(bin2bcd(min));
  i2c_write(bin2bcd(hr));
  i2c_write(bin2bcd(dow));
  i2c_write(bin2bcd(day));
  i2c_write(bin2bcd(mth));
  i2c_stop();
}

void rtc_clear_stamp()
{
   BYTE regtmp = 0;

   i2c_start();
   i2c_write(ADDR_RTCC_WRITE);     // WR to RTC
   i2c_write(ADDR_DAY);            // REG 0
   i2c_start();
   i2c_write(ADDR_RTCC_READ);      // RD from RTC
   regtmp = bcd2bin(i2c_read(0));  // le para regtmp o valor do registrador 0x03 no rtc
   i2c_stop();

   regtmp |= 0x10; //set to 1 4th bit of register 0x03 cleaning timestamps
   
   delay_us(3);

   i2c_start();
   i2c_write(ADDR_RTCC_WRITE);      // WR to RTC
   i2c_write(ADDR_DAY);             // REG 0
   i2c_start();
   i2c_write(ADDR_RTCC_WRITE);      // WR to RTC
   i2c_write(regtmp);               // read value + bit 4 set
   i2c_stop(); 
}

BYTE rtc_read_byte(BYTE address)
{
  BYTE tmp;
  i2c_start();
  i2c_write(ADDR_EEPROM_WRITE);
  i2c_write(address);            // Start point to specific address
  i2c_start();
  i2c_write(ADDR_EEPROM_READ);
  tmp  = bcd2bin(i2c_read(0));
  i2c_stop();
  return tmp; 
}

void rtc_write_byte(BYTE address, BYTE value)
{
  i2c_start();
  i2c_write(ADDR_EEPROM_WRITE);
  i2c_write(address);            // Start point to specific address
  i2c_start();
  i2c_write(ADDR_EEPROM_WRITE);
  i2c_write(value);
  i2c_stop();
}

BYTE bin2bcd(BYTE binary_value)
{
   BYTE temp;
   BYTE retval;

   temp = binary_value;
   retval = 0;
   
   if(temp >= 10)
   {
      temp -= 10;
      retval += 0x10;
   }
   else
   {
      retval += temp;
      break;
   }

   return(retval);
}


BYTE bcd2bin(BYTE bcd_value)
{
  BYTE temp;

  temp = bcd_value;
  temp >>= 1;
  temp &= 0x78;
  return(temp + (temp >> 2) + (bcd_value & 0x0f));
}
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