58 lines
2.4 KiB
C
58 lines
2.4 KiB
C
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///*------------------------------------------------------------------------------
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// * File: Lab03_D3.c
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// * Function: Turning on LED1 when S1 is pressed
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// * Description: This C program turns on LED1 connected to P1.0 when the S1 is
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// * pressed. S1 is connected to P2.1 and when it is pressed,
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// * P2IN, bit 1 is read as a logic 0 (check the schematic).
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// * To avoid faulty detection of button press,
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// * debouncing delay of 20ms is added before turning on the LED1.
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// * Clocks: ACLK = 32.768kHz, MCLK = SMCLK = default DCO (~1 MHz)
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// * MSP-EXP430F5529LP
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// * -----------------
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// * /|\| |
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// * | | |
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// * --|RST |
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// * | P1.0|-->LED1(RED)
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// * | P2.1|<--SW1
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// * | |
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// * Input: Pressing S1
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// * Output: LED1 is turned on when S1 is pressed
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// * Author(s): Aleksandar Milenkovic, milenkovic@computer.org
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// * Prawar Poudel, prawar.poudel@uah.edu
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// * Date:
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// * ---------------------------------------------------------------------------*/
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//#include <msp430.h>
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//
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//#define S1 P2IN&BIT1
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//#define REDLED 0x01 // Mask for BIT0 = 0000_0001b
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//#define GREENLED 0x80 // Mask for BIT7 = 1000_0000b
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//
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//void main(void)
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//{
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// WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
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// P1DIR |= REDLED; // Set P1.0 to output direction
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// P1OUT &= ~REDLED; // LED1 is OFF
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//
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// P2DIR &= ~BIT1; // Set P2.1 as input for S1 input
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// P2REN |= BIT1; // Enable the pull-up resistor at P2.1
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// P2OUT |= BIT1; // Required for proper IO
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//
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// unsigned int i = 0;
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// while(1) // Infinite loop
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// {
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// if ((S1) == 0) // If S1 is pressed
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// {
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// for (i = 2000; i > 0; i--); // Debounce ~20 ms
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// if ((S1) == 0) // If S1 is pressed
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// {
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// P1OUT |= REDLED; // Turn LED1 on
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// }
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// while ((S1) == 0); // Hang-on as long as S1 pressed
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// }
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// else
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// {
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// P1OUT &= ~REDLED; // Turn LED1 off
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// }
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// }
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//}
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