2402.C   I2C Library Sub-Routines for 24LC02 /////////////////////////////////////////////////////////////////////////// //// //// //// Library for a MicroChip 24LC02B configured for a x8 org //// //// //// //// init_ext_eeprom(); Call before the other functions are used //// //// //// //// write_ext_eeprom(a, d); Write the byte d to the address a //// //// //// //// d = read_ext_eeprom(a); Read the byte d from the address a //// //// //// //// The main program may define eeprom_sda //// //// and eeprom_scl to override the defaults below. //// //// //// //// //// //// (C) Copyright 1996,1997 Custom Computer Services //// //// //// /////////////////////////////////////////////////////////////////////////// #ifndef EEPROM_SDA #define EEPROM_SDA PIN_B7 #define EEPROM_SCL PIN_B6 #endif #use i2c(master,sda=EEPROM_SDA, scl=EEPROM_SCL) #define EEPROM_ADDRESS byte #define EEPROM_SIZE 256 void init_ext_eeprom() { output_low(eeprom_scl); output_high(eeprom_sda); } void write_ext_eeprom(byte address, byte data) { i2c_start(); i2c_write(0xa0); i2c_write(address); i2c_write(data); i2c_stop(); delay_ms(11); } byte read_ext_eeprom(byte address) { byte data; i2c_start(); i2c_write(0xa0); i2c_write(address); i2c_start(); i2c_write(0xa1); data=i2c_read(0); i2c_stop(); return(data); }

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