Part Number: MSP430F5529
Tool/software: Code Composer Studio
I have a program that asks for a user name and password for a simple login via terminal, and it works correctly. I am curious what would be the best way to implement a timeout using the timers on this board to only allow ~30 seconds for password input. Should I use an ISR in the password function?
//Instructions: Set the following parameters in PuTTY
//Port: COM4
//Baud rate: 115200
//Data bits: 8
//Parity: None
//Stop bits: 1
//Flow Control: None
#include <msp430.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
//values for outputs and input
char firstquestion[29] = "Please enter the user name: ";
const char username[10] = "user name";
const char username2[12] = "user name 2";
char usernameinput[12];
char secondquestion[21] = "Enter the password: ";
const char password[9] = "password";
const char password2[10] = "password2";
char passwordinput[10];
char correctanswer[22] = "Correct!!!";
char incorrectanswer[35] = "Incorrect user name or password!!!";
//loop counter
unsigned int i=0;
//new line and carriage return
void newline(void)
{
while(!(UCA0IFG&UCTXIFG)); //waits for character
UCA0TXBUF='\n'; //sets character to new line
while(!(UCA0IFG&UCTXIFG)); //waits for character
UCA0TXBUF='\r'; //sets character to carriage return
}
//prompt for user name
void userdata(void)
{
for(i=0; i<strlen(firstquestion);i++) //loops through first question elements and outputs
{
while(!(UCA0IFG&UCTXIFG)); //waits for character
UCA0TXBUF=firstquestion[i]; //sets character to for element of first question
}
newline(); //calls new line and carriage return function
for(i=0; i<50;i++) //loops through received characters loop needs to go long enough for password and user name
{
while(!(UCA0IFG&UCRXIFG)); //waits for character
if(UCA0RXBUF== 0x0D) //if character is the "Enter key" will break from receiving characters
break;
while(!(UCA0IFG&UCTXIFG)); //waits for character
UCA0TXBUF=UCA0RXBUF; //sets transmit buffer equal to receive buffer to echo print what user types
usernameinput[i]=UCA0RXBUF; //sets first element of user name equal to first character received from transmit buffer
}
UCA0RXBUF = 0; //clears transmit buffer
usernameinput[i]= 0x00; //adds null character to end of user name array
}
void passdata(void)
{
newline();
for(i=0; i<strlen(secondquestion);i++) //loops through second question elements and outputs
{
while(!(UCA0IFG&UCTXIFG)); //waits for character
UCA0TXBUF=secondquestion[i]; //sets character to for element of second question
}
newline(); //calls new line and carriage return function
for(i=0; i<50;i++) //loops through received characters loop needs to go long enough for password and user name
{
while(!(UCA0IFG&UCRXIFG)); //waits for character
if(UCA0RXBUF== 0x0D) // if character is the "Enter key" will break from receiving characters
break;
while(!(UCA0IFG&UCTXIFG)); //waits for character
UCA0TXBUF='*'; //instead of echo printing prints '*' for the bonus
UCA0TXBUF=UCA0RXBUF;
passwordinput[i]=UCA0RXBUF; //sets first element of password equal to first character received from transmit buffer
}
UCA0RXBUF = 0; //clears transmit buffer
passwordinput[i]= 0x00; //adds null character to end of password array
}
void correct(void)
{
newline(); //calls new line and carriage return function
for(i=0; i<strlen(correctanswer);i++) //loops through the output if the user name and password are character
{
while(!(UCA0IFG&UCTXIFG)); //waits for character
UCA0TXBUF=correctanswer[i]; //sets character to each element of output
}
newline(); //calls new line and carriage return function
}
void incorrect(void)
{
newline(); //calls new line and carriage return function
for(i=0; i<strlen(incorrectanswer);i++) //loops through output if user name and password are incorrect
{
while(!(UCA0IFG&UCTXIFG)); //waits for character
UCA0TXBUF=incorrectanswer[i]; //sets character to each element of output
}
newline(); //calls newline and carriage return function
}
void comparedata(void)
{
unsigned int x=0; //values for testing user name
unsigned int y=0; //value for testing password
for(i=0; i<strlen(username);i++) //loops through user name
{
if(username[i]==usernameinput[i]) //if user name element is equal to the inputed user name element
x=1; //sets x to 1
else if(username2[i]==usernameinput[i])
x=1;
else
{
x=0; //if not equal sets x to 0
break; //also breaks if it is not equal
}
}
for(i=0; i<strlen(password);i++) //loops through password
{
if(password[i]==passwordinput[i]) //if password element is equal to the inputed password element
y=1; //set y to 1
else if(password2[i]==passwordinput[i])
x=1;
else
{
y=0; //if not equal sets y to 0
break; //also breaks if it is not equal
}
}
if((x && y) == 1) //if x and y equal 1 then both password and user name are the same
correct(); //if they are the same calls correct function to print specific output
else
incorrect(); //if either of them are not equal call incorrect function to print specific output
}
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P3SEL |= BIT3 + BIT4; // Set USCI_A0 RXD/TXD to receive/transmit data
UCA0CTL1 |= UCSWRST; // Set software reset during initialization
UCA0CTL0 = 0; // USCI_A0 control register
UCA0CTL1 |= UCSSEL_2; // Clock source SMCLK
UCA0BR0 = 0x09; // 1048576 Hz / 115200 lower byte
UCA0BR1 = 0x00; // upper byte
UCA0MCTL |= UCBRS0; // Modulation (UCBRS0=0x01, UCOS16=0)
UCA0CTL1 &= ~UCSWRST; // Clear software reset to initialize USCI state machine
while(1)
{
userdata(); //calls user name function
passdata(); //calls password function
comparedata(); //calls compare function
}
}
