MSP430F5529: Problem in interfacing with DHT11 sensor

Part Number: MSP430F5529

I am trying to perform successive readings of the DHT11 humidity and temperature sensor and actually it is reading, but only once. When I put a while (1) after the line lcd_wr_byte (RXBUF5), it is noted that in the first reading there is no problem. As you can see, the RXBUF5 (checksum) is giving the sum of RXBUF1 (humidity integer), RXBUF2(humidity decimal), RXBUF3(temperature integer) and RXBUF4 (temperature decimal), and as a test I am simply writing the RXBUF5 on the LCD. But when I take out the while (1), the idea was for the sensor to perform successive readings with an interval of about 3 seconds (represented by the delays), but it only reads the first time, because when it leaves for the second reading it simply stop in the do{ cont1++; } while((P3IN & BIT4) == BIT4) line, that is, it is as if the sensor pulls the line down (so far so good), then pull the line up (alright too), but it does not pull the line down again to get started the transmission of the bits. For those who are not yet aware of the DHT11 protocol (1-wire protocol), the following is an illustration:

Code:

int main(void)
{
    WDTCTL = WDTPW | WDTHOLD;   // stop watchdog timer

    config_timerA0(); //Time for LCD
    config_I2C(); //LCD Comunication
    lcdInic(); //LCD Inicialization
    lcdBacklightON(); //LCD
    lcd_RS_rw(); //LCD
    port_out(); //P3.4 = OUT
    config_timerA1(); //Timer to keep the line down for 20 ms

    while(1){

        P3OUT &= ~BIT4; //Start signal
        TA1R = 0;
        while((TA1CCTL0 & CCIFG) == 0); //20 ms?
        P3OUT |= BIT4;
        port_in(); //P3.4 = IN
        while((P3IN & BIT4) == 1);

        //DHT11 replied

        do {
            cont1++;
        } while ((P3IN & BIT4)==0);
        if(cont1 <= 10){ //<= 80 us?
            cont1 = 0;
            do {
                cont1++;
            } while ((P3IN & BIT4) == BIT4); //Here is the problem at the second reading, always stop here
            if(cont1 <= 10){ //<= 80 us?
                humidity_integer(); //writes on RXBUF1
                humidity_decimal(); //writes on RXBUF2
                temperature_integer(); //writes on RXBUF3
                temperature_decimal(); //writes on RXBUF4
                checksum(); //writes on RXBUF5

                if((RXBUF5) == (RXBUF1 + RXBUF2 + RXBUF3 + RXBUF4)){
                    lcd_wr_byte(RXBUF5); //Testing on LCD
                    
                    //while(1);
                }

                RXBUF1 = 0;
                RXBUF2 = 0;
                RXBUF3 = 0;
                RXBUF4 = 0;
                RXBUF5 = 0;

            }
        }
        
         //I don't think these delays would be the problem, cause I already tried using timers and it didn't work.

         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);
         delay(20000);

         port_out();
    }

    return 0;
}


void port_out(){

P3DIR |= BIT4;

  }

void port_in(){
P3DIR &= ~BIT4;
P3REN |= BIT4;
P3OUT |= BIT4;
}

Can anyone help me please?