i2c.zip_The Program

#include<lpc21xx.h> #include<i2c.h> //#include<lcd.h> void i2c_init() { PINSEL0 |= 0x00000050; //config. P0.2->scl & P0.3->sda I2CONCLR = 0x000000FF; //CLR ALL CNTL FLAG INCLUDING ACK I2SCLL = 75; I2SCLH = 75; } void i2c_tx_data(int device,int add,int data) { i2c_start(); I2DAT = device; I2CONCLR = 0x08; I2CONCLR = 0x20; wait_for_ack(0x18); I2DAT = add; I2CONCLR = 0x08; wait_for_ack(0x28); I2DAT = data; I2CONCLR = 0x08; wait_for_ack(0x28); I2CONCLR = 0x08; i2c_stop(); } void i2c_start(void) { I2CONCLR = 0x08; // I2C INTERRUPT CLEAR delay1(10); I2CONSET = 0x40; //enable I2C interface delay1(10); I2CONSET = 0x20; //to set start flag,& to enter in Master mode wait_for_ack(0x08); } void i2c_stop(void) { I2CONSET =0x10 ; delay1(10); I2CONCLR = 0x40; /* I2CONCLR = 0x08; //clear I2C interrupt bit delay(10); I2CONCLR = 0x40; //clear I2C interface bit */ } void i2c_setpointer(int device ,int ptr) { i2c_start(); I2CONCLR = 0x20; // clear the START bit to avoid retransmit of START I2DAT = device; // transmit slave address with write bit I2CONCLR = 0x08; wait_for_ack(0x18); I2DAT = ptr; I2CONCLR = 0x08; wait_for_ack(0x28); i2c_stop(); } void wait_for_ack(unsigned int status) { while(1) { if(I2CONSET & 0x08) { delay1(20); if(I2STAT == status) { break; } else { I2CONSET = 0x80; I2CONCLR = 0xFF; i2c_stop(); i2c_start(); break; } } } } int i2c_rx_data(int device, int add) { int DATA; i2c_setpointer(device,add); i2c_start(); I2DAT = device|0x01; I2CONCLR = 0x20; I2CONCLR = 0x08; wait_for_ack(0x40); I2CONSET =0x04; I2CONCLR = 0x08; wait_for_ack(0x50); DATA = I2DAT; I2CONSET =0x04; i2c_stop(); return DATA; } void i2c_tx_data_eeprom(int device,int ptr1,int ptr2,char data) { i2c_start(); I2DAT = device; //transmit slave address with write bit I2CONCLR = 0x08; I2CONCLR = 0x20; wait_for_ack(0x18); I2DAT = ptr1; I2CONCLR = 0x08; //clear int flag wait_for_ack(0x28); I2DAT = ptr2; I2CONCLR = 0x08; wait_for_ack(0x28); I2DAT = data; I2CONCLR = 0x08; wait_for_ack(0x28); I2CONCLR = 0x08; I2CONSET = 0x10; //enable stop condition while(!(I2CONSET & 0x08)) { I2CONSET = 0x20; delay1(100); I2DAT = 0xA1; while(1) { if(I2CONSET & 0x08) break; } } I2CONCLR = 0xFF; i2c_stop(); } char i2c_rx_data_eeprom(int device,int add1,int add2) { char temp; i2c_setpointer_eeprom(device,add1,add2); i2c_start(); I2DAT = device | 0x01; I2CONCLR = 0x20; I2CONCLR = 0x08; wait_for_ack(0x40); I2CONSET = 0x04; I2CONCLR = 0x08; wait_for_ack(0x50); temp = I2DAT; I2CONSET = 0x04; i2c_stop(); return temp; } void delay1(int d) { int i; while(d) { for(i=0;i<10000;i++); d--; } } void i2c_setpointer_eeprom(unsigned int device,unsigned int ptr1,unsigned int ptr2) { i2c_start(); I2CONCLR = 0x20; I2DAT = device; I2CONCLR = 0x08; wait_for_ack(0x18); I2DAT = ptr1; I2CONCLR = 0x08; wait_for_ack(0x28); I2DAT = ptr2; I2CONCLR = 0x08; wait_for_ack(0x28); I2CONCLR = 0x08; i2c_stop(); }