Reply To: PIC Microcontroller Non-Blocking Delay Implementation

This is how I have changed my code and the result is still the same :

char uart_rd;
char cnt, cnt1;

void interrupt ()
{
  if (TMR0IF_bit)
  {
    cnt++;                 // increment counters
    cnt1++;
    TMR0IF_bit = 0;        // clear TMR0IF
    TMR0L = 0xDC;             // set TMR0 for aproximetly 1 sec
    TMR0H = 0x0B;
  }
}

void one_min_delay ()
{
  TRISB  = 0;              // PORTB is output
  TMR0H = 0x0B;
  TMR0L = 0xDC;               // Timer0 initial value

  T0CON = 0x84;            // Set TMR0 to 8bit mode and prescaler to 256
  GIE_bit = 1;             // Enable global interrupt
  TMR0IE_bit = 1;          // Enable Timer0 interrupt

  cnt = 0;                 // Initialize cnt

  do
  {
    if (cnt >= 60)
    {
      LATB = 0x00;      // turnoff PORTB LEDs
      cnt = 0;             // Reset cnt
    }
  }while(1);
}

void two_min_delay ()
{
  TRISB  = 0;              // PORTB is output
  TMR0H = 0x0B;
  TMR0L = 0xDC;               // Timer0 initial value
  T0CON = 0x84;            // Set TMR0 to 8bit mode and prescaler to 256
  GIE_bit = 1;             // Enable global interrupt
  TMR0IE_bit = 1;          // Enable Timer0 interrupt

  cnt1 = 0;                 // Initialize cnt1

  do
  {
    if (cnt1 >= 120)
    {
      LATB = 0x00;      // turnoff PORTB LEDs
      cnt1 = 0;             // Reset cnt
    }
  }while(1);
}

void main()
{
  UART1_Init(9600);               // Initialize UART module at 9600 bps
  Delay_ms(100);                  // Wait for UART module to stabilize
  TRISB = 0x00;

  while (1)
  {
    if (UART1_Data_Ready())
    {     // If data is received,
      uart_rd = UART1_Read();
    }

    if (uart_rd=='A')
    {
      LATB = 0x01;
      one_min_delay();
    }
    else if (uart_rd == 'B')
    {
      PORTB = 0x02;
      two_min_delay ();
    }
    uart_rd ='\0';
  }
}