MSP30 launchpad: sending multiple char in UART, with each char must be sent only after acknowledgement

Don't put too much of data processing in Isr. It's too simple, compare d character h and send ok,and on receiving ok send next character which is I here.

ok.. 

If microcontroller will be receiving "OK"..

1)how to receive multiple characters?

Is this code correct for receiving multiple characters?

char stringr[]; is declared. 

#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)
{
stringr[ i ] = UCA0RXBUF;
i++;
}

2)  how to compare whether the received characters are "OK"?

Karthikeyan Dhandapani said:

how to compare whether the received characters are "OK"?

if your acknowledgment string is always going to be "OK", you can compare the string of length 2 as below

if(i==2){strncmp(stringr,"OK",2)}

but this comparison will happen for all the data which is more than 2 bytes, so you can maintain a flag to say that you are expecting an acknowledgment and not data so,

it becomes, if(i==2 && expecting_ACK == 1){strncmp(stringr,"OK",2)}

use a key variable to start comparison in string helps u.

I used Enter here.

#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)
{
storedata[h++] = UCA0RXBUF;                       //String "storedata" is used to store Rx data
  if(storedata[h-1] == '\r')                                 //check if enter is pressed
    {

       storedata[h-1] = '\0';                                 //add null char to terminate string
       h=0; //reset address of data string
    }

 if(strcmp(storedata, prestring) == 0)           //Compare sting(here it is predefined and containing text)
{ P1OUT ^= 0x01;
                 // Toggle if string match. It can have any length     
}