Interfacing SM630

Driver for interfacing SM630 finger print scanner

#define cmd_add_fingerprint	0x40
#define cmd_search_fingerprint 0x44
#define cmd_packet	0x10
#define data_packet	0x20
#define res_packet	0x30

#define res_rcv_correct 0x01
#define res_rcv_error	0x02
#define res_opr_success	0x31
#define res_finger_detected	0x32
#define res_timeout	0x33
#define res_process_fail 0x34
#define res_para_error	0x35
#define res_fingerprint_found 0x39
#define res_fingerprint_unfound 0x3A

#use rs232(baud=57600,xmit=PIN_C6,rcv=PIN_C7,bits=8,parity=n,stop=1,stream=Finger,timeout=1000)//,force_sw)

int8 cmd_buffer[10],response_buffer[15];

int8 find_checksum(int8 total_byte)
{
	int8 byte_count;
	int16 check_sum=0;
	for(byte_count=0;byte_count<total_byte;byte_count++)
	{
		check_sum+=cmd_buffer[byte_count];
	}
	
	return(make8(check_sum,0));
}

void cmd_to_sm630(int8 total_byte)
{
	int8 byte_count;
	for(byte_count=0;byte_count<total_byte;byte_count++)
	{
		fputc(cmd_buffer[byte_count],Finger);
		delay_us(10);
	}		
}

void response_from_sm630(int8 total_byte)
{
	int8 byte_count;
	while(fgetc(Finger)!=0x4D);
	response_buffer[0]=0x4D;
	for(byte_count=1;byte_count<total_byte;byte_count++)
	{
		response_buffer[byte_count]=fgetc(Finger);
	}			
}		
	

int8 add_finger(int16 finger_id)
{
	cmd_buffer[0]=0x4D; //Packet Head
	cmd_buffer[1]=0x58; //Packet Head
	cmd_buffer[2]=cmd_packet; //Command Packet
	cmd_buffer[3]=0x03; //3 byte length
	cmd_buffer[4]=cmd_add_fingerprint; //Add finger Print cmd
	cmd_buffer[5]=make8(finger_id,1);//Higher byte of finger print id
	cmd_buffer[6]=make8(finger_id,0);//Lower byte of finger print id
	cmd_buffer[7]=find_checksum(7);//Check sum of 7 bytes
	
	cmd_to_sm630(8);
	response_from_sm630(6); //Read 6 bytes
	
	if(response_buffer[4] == res_rcv_correct)
	{
		
		response_from_sm630(7); //Read 6 bytes
		if(response_buffer[5] == res_opr_success)
		{
			//Display Press finger again
			//lcd_goto(2,1);
			//lcd_send_byte("  Press again   ");
			response_from_sm630(7); //Read 6 bytes
		}
	}
	return (response_buffer[5]);		
}	

int8 search_finger(int16& result_id,int16 num_fingerprint)
{
	output_low(PIN_A5);
	cmd_buffer[0]=0x4D; //Packet Head
	cmd_buffer[1]=0x58; //Packet Head
	cmd_buffer[2]=cmd_packet; //Command Packet
	cmd_buffer[3]=0x05; //5 byte length
	cmd_buffer[4]=cmd_search_fingerprint; //Search finger Print cmd
	cmd_buffer[5]=0x00; //Higher byte of Starting id
	cmd_buffer[6]=0x00; //Lower byte of Starting id
	cmd_buffer[7]=make8(num_fingerprint,1);//Higher byte of number of  fingerprints searched
	cmd_buffer[8]=make8(num_fingerprint,0);//Lower byte of number of  fingerprints searched
	cmd_buffer[9]=find_checksum(9);//Check sum of 9 bytes
	
	cmd_to_sm630(10);
	response_from_sm630(6); //Read 6 bytes
	if(response_buffer[4] == res_rcv_correct)
	{
		response_from_sm630(7); //Read 7 bytes
		if(response_buffer[5] == res_opr_success)
		{
				delay_ms(10);
				response_from_sm630(6); //Read 6 bytes
				//disp_response(6);
				if(response_buffer[5] == res_fingerprint_found)
				{
					response_buffer[0]=fgetc(Finger);
					response_buffer[1]=fgetc(Finger);
					result_id=make16(response_buffer[0],response_buffer[1]);
				}
		
	
		}

	}
	else
		response_buffer[5]=response_buffer[4];		
	return (response_buffer[5]);	
		

}