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@@ -0,0 +1,83 @@
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+//Define Constants---------------------------------------------------
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+#define USB_PORT /dev/ttyACM3
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+#define PAGESIZE 64
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+
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+//Include Header Files-----------------------------------------------
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+#include<stdlib.h>
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+#include<stdio.h>
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+#include<time.h>
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+#include<errno.h>
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+#include<unistd.h>
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+#include<termios.h>
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+#include<sys/types.h>
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+#include<sys/stat.h>
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+#include<fcntl.h>
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+#include<sys/resource.h>
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+
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+//Prototypes---------------------------------------------------------
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+void delay(int delay_time);
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+void print_attrTermios(struct termios * ptr_attr);
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+
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+//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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+//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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+//Main-Program
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+int main(int argc, const char * argv[]){
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+
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+//initializing USART at USB_PORT-------------------------------------
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+ int USB = open("/dev/ttyACM3", O_RDWR|O_NOCTTY);
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+ if(isatty(USB)==0){
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+ printf("ERROR: No File Descriptor! \n");
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+ return 0;
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+ }
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+ struct termios * ptr_attr = (struct termios *)
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+ malloc(sizeof(struct termios));
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+ if(ptr_attr==NULL){
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+ printf("ERROR: Termios not available \n");
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+ return 0;
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+ }
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+ tcgetattr(USB, ptr_attr);
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+ (*ptr_attr).c_iflag = IGNPAR;
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+ (*ptr_attr).c_oflag = 0;
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+ (*ptr_attr).c_cflag = CS8|CREAD;
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+ (*ptr_attr).c_lflag = 0;
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+ cfsetspeed(ptr_attr, B19200);
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+ tcsetattr(USB, TCSANOW ,ptr_attr);
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+ delay(1000);
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+
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+//Establishing Connection-------------------------------------------
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+ char req[] = "REQ";
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+ char ack[] = "ACK";
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+ char * ptr_ack = &ack[0];
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+ char * ptr_input = (char *)malloc(3*sizeof(char));
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+ char * ptr_req = &req[0];
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+ while(1){
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+ write(USB, ptr_req, 3*sizeof(char));
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+// tcflush(USB, TCIFLUSH);
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+ read(USB, ptr_input, 3*sizeof(char));
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+// tcflush(USB, TCOFLUSH);
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+ printf("%s \n", &ptr_input[0]);
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+ }
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+ //delay(100);
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+ close(USB);
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+ return EXIT_SUCCESS;
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+}
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+//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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+//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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+
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+
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+//Delay-Function-----------------------------------------------------
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+void delay(int delay_time){
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+ clock_t time1 = clock();
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+ while(((clock()-time1)/CLOCKS_PER_SEC)*1000
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+ != (clock_t)delay_time);
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+}
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+
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+//Print Termios-Attributes-------------------------------------------
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+void print_attrTermios(struct termios * ptr_attr){
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+ printf("Input Mode Flag: %d \n", (*ptr_attr).c_iflag);
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+ printf("Output Mode Flag: %d \n", (*ptr_attr).c_oflag);
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+ printf("Control Mode Flag: %d \n", (*ptr_attr).c_cflag);
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+ printf("Local Mode Flag: %d \n", (*ptr_attr).c_lflag);
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+ printf("Baudrate Input: %d \n", (*ptr_attr).c_ispeed);
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+ printf("Baudrate Output: %d \n", (*ptr_attr).c_ospeed);
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+}
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