//Define Constants---------------------------------------------------
typedef enum {false, true} bool; 

//Include Header Files-----------------------------------------------
#include<stdlib.h>
#include<stdio.h>
#include<time.h>
#include<errno.h>
#include<unistd.h>
#include<termios.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<sys/resource.h>

//Prototypes---------------------------------------------------------
int delay(int delay_time);
void print_attrTermios(struct termios * ptr_attr);

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//Main-Program
int main(int argc, const char * argv[]){

//initializing USART at USB_PORT-------------------------------------
	int USB = open("/dev/ttyACM3", O_RDWR|O_NOCTTY);
	if(isatty(USB)==0){
		printf("ERROR: No File Descriptor! \n");
		return 0;
	}
	struct termios * ptr_attr = (struct termios *)
									malloc(sizeof(struct termios));
	if(ptr_attr==NULL){
		printf("ERROR: Termios not available! \n");
		return 0;
	}
	tcgetattr(USB, ptr_attr);
	(*ptr_attr).c_iflag = IGNPAR;
	(*ptr_attr).c_oflag = 0;
	(*ptr_attr).c_cflag = CS8|CREAD;
	(*ptr_attr).c_lflag = 0;
	cfsetspeed(ptr_attr, B19200);
	tcsetattr(USB, TCSANOW ,ptr_attr);

	char req[] = {'R', 'E', 'Q'};
	char ack[] = {'A', 'C', 'K'};
	char input[3];
	char page[] = "PAGE";
	char * ptr_req = &req[0];
	char * ptr_ack = &ack[0];
	char * ptr_input = &input[0];
	char * ptr_page = &page[0];
	int connection;
	delay(1000);

//Establishing  Connection-------------------------------------------
	write(USB, ptr_req, sizeof(req));
	tcflush(USB, TCIFLUSH);
	read(USB, ptr_input, sizeof(input));
	tcflush(USB, TCOFLUSH);
	ptr_input = &input[0];
	for(int i=0; i<3; i++){
		connection = false;
		if(input[i]!=ack[i]){
			break;
		}
		connection = true;
	}
	if(connection==true){
			printf("Connection Success! \n");
	}
	else{
			printf("Connection Failed! \n");
	}

//Sending Page-------------------------------------------------------
	for(int i=0; i<64; i++){
		write(USB, ptr_page, sizeof(char));
		tcflush(USB, TCIFLUSH);
		ptr_page++;
		if(ptr_page> & page[3]){
			ptr_page = &page[0];
		}
	}
	printf("Page send! \n");
	close(USB);
	return EXIT_SUCCESS;
}	
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


//Delay-Function-----------------------------------------------------
int delay(int delay_time){
	clock_t time1 = clock();
	while(((clock()-time1)/CLOCKS_PER_SEC)*1000
			 							!= (clock_t)delay_time);
	return 1;
}

//Print Termios-Attributes-------------------------------------------
void print_attrTermios(struct termios * ptr_attr){
	printf("Input Mode Flag: %d \n", (*ptr_attr).c_iflag);
	printf("Output Mode Flag: %d \n", (*ptr_attr).c_oflag);
	printf("Control Mode Flag: %d \n", (*ptr_attr).c_cflag);
	printf("Local Mode Flag: %d \n", (*ptr_attr).c_lflag);
	printf("Baudrate Input: %d \n", (*ptr_attr).c_ispeed);
	printf("Baudrate Output: %d \n", (*ptr_attr).c_ospeed);
}