Part Number: MSP430G2553
Tool/software: TI C/C++ Compiler
I got 3 switches. they are x, y, z. x means 0 and y means 1 and z is to activate led if the password correct . password already created in the code . for example 1100 . I push switches and if I type correct switches and led is on . I am doing something wrong . I can't figure out where I am doing wrong . can you please help me .
#include <msp430g2553.h>
int PASSWORD = 0xC;
int pass = 0;
int state = 0;
enum states {
idle = 0,
first_char,
wait_second,
second_char,
wait_third,
third_char,
wait_forth,
forth_char,
check
};
/**
* blink.c
*/
void main(void)
{
WDTCTL = WDTPW | WDTHOLD; // stop watchdog timer
P1DIR |= BIT0; // Output LED showing if password is correct
P1DIR &= ~BIT1; // input x
P1DIR &= ~BIT2; // input y
P1DIR &= ~BIT3; // input z
P1DIR |= BIT5; // Output LED showing if password is wrong
P2DIR = 0xFF;
volatile unsigned int i; // volatile to prevent optimization
while(1)
{
switch(state)
{
case idle: //This is the wait state where there has been no character of password been entered
P1OUT &= ~BIT0;
P1OUT &= ~BIT5;
if(P1IN == BIT1)
{
pass = (pass << 1) | 0;
state = first_char;
}
else if(P1IN == BIT2)
{
pass = (pass << 1) | 1;
state = first_char;
}
else if(P1IN == BIT3)
{
state = check;
}
break;
case first_char:
P1OUT &= ~BIT0;
if(P1IN == 0 )
{
state = wait_second;
}
else
{
state = first_char;
}
break;
case wait_second:
P1OUT &= ~BIT0;
if(P1IN == BIT1)
{
pass = (pass << 1) | 0;
state = second_char;
}
else if(P1IN == BIT2)
{
pass = (pass << 1) | 1;
state = second_char;
}
else if(P1IN == BIT3)
{
state = check;
}
break;
case second_char:
P1OUT &= ~BIT0;
if(P1IN == 0 )
{
state = wait_third;
}
else
{
state = second_char;
}
break;
case wait_third:
P1OUT &= ~BIT0;
if(P1IN == BIT1)
{
pass = (pass << 1) | 0;
state = third_char;
}
else if(P1IN == BIT2)
{
pass = (pass << 1) | 1;
state = third_char;
}
else if(P1IN == BIT3)
{
state = check;
}
break;
case third_char:
P1OUT &= ~BIT0;
if(P1IN == 0 )
{
state = wait_forth;
}
else
{
state = third_char;
}
break;
case wait_forth:
P1OUT &= ~BIT0;
if(P1IN == BIT1)
{
pass = (pass << 1) | 0;
state = forth_char;
}
else if(P1IN == BIT2)
{
pass = (pass << 1) | 1;
state = forth_char;
}
else if(P1IN == BIT3)
{
state = check;
}
break;
case forth_char: //This is the wait state where there has been no character of password been entered
P1OUT &= ~BIT0;
if(P1IN == BIT3)
{
state = check;
}
else
state = forth_char;
break;
case check: //This is the wait state where there has been no character of password been entered
if(pass == PASSWORD)
{
P1OUT |= BIT0;
if(P1IN == BIT0)
state = idle;
}
else
{
P1OUT |= BIT5;
if(P1IN == BIT5)
state = idle;
}
break;
}
P2OUT = state;
}
}
