i2crtc.h

lcd interface code for lpc214x series micro controllers

#define I2C_ERROR 1                           // these are the values that are stored in i2c_status
#define I2C_OK 2                              // after reading or writing a byte and during an I2C operation
#define I2C_BUSY 0

#define SECONDS 0x02                          // define Real Time Clock register addresses
#define MINUTE 0x03
#define HOUR 0x04
#define DAY 0x05
#define WEEKDAY 0x06
#define MONTH 0x07
#define YEAR 0x08

#define NOMASK 0		                      // define constants to indicate if a register should be masked				  
#define MASK 1                                // or not after reading

extern void init_i2c(void);
extern void rtc_write_byte(unsigned char address, unsigned char byte);
extern unsigned char rtc_read_byte(unsigned char address, unsigned char maskoff);
extern unsigned char i2c_status;