i2c_slave.c

门禁系统 interated with LCD

#include "I2C_Slave.h"

void i2cs_Init(void) 
{
	SMP = 0;			//Sample bit (SSPSTAT Bit 7) cleared
	CKE = 0;			//CKE conforms to I2C spec
	SSPMode(SLAVE_MODE); //Set SSPM3:0  to be 0110
	SSPAdd_Set();
	Clk_Release();
	SCL_DIR = I2C_INPUT; //both SCL, SDA are inputs in I2C Slave mode
	SDA_DIR = I2C_INPUT;
	SSPIE = 1;			//Enable Interrupt
	SSPEN = 1;			 //Enable I2C
	GIE = 1;
	PEIE = 1;
	
	//return FALSE;
}


int i2cs_Cmp_Add(void) {
		int data;
	   //incoming data...
		if (BF) {
			data = SSPBUF;	//read from buffer
			BF = 0;
		}
		SSPOV = 0;
		if ( (data & 0xFE) == SLAVE_ADDRESS ) return FALSE;
		return I2C_ERROR;
}