Question

write piece of c code for the instruction below

When the last character (the 16th) has been received, set a flag to notify the main program that a complete message has been received and is ready to be displayed.

ISR(USART_RX_vect)
    {
        char ch;

        ch = UDR0;                  // Get the received charater

        // Store in buffer

        // If message complete, set flag
    }

Answer 1

struct msg_buffer {

    long msg_type;

    char msg_text[100];

} message;

  

int main()

{

    key_t key;

    int msgid,flag;

    key = ftok("progfile", 65);

    msgid = msgget(key, 0666 | IPC_CREAT);

    message.msg_type = 1;

  

    printf("Write Data : ");

    gets(message.msg_text);

if( msgsnd(msgid, &message, sizeof(message), 0);)

flag =0

    printf("Data send is : %s \n", message.msg_text);

    return 0;

}

struct mesg_buffer {

    long mesg_type;

    char mesg_text[100];

} message;

  

int main()

{

    key_t key;

    int msgid,flag;

    key = ftok("progfile", 65);

    msgid = msgget(key, 0666 | IPC_CREAT);

if ( msgrcv(msgid, &message, sizeof(message), 1, 0); )

flag=1;

    printf("Data Received is : %s \n", message.msg_text);

    msgctl(msgid, IPC_RMID, NULL);  

if (flag ==1)

print('msg read");

    return 0;

}