43 lines
1.9 KiB
C
43 lines
1.9 KiB
C
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/*------------------------------------------------------------------------------
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* File: Lab03_D2.c
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* Function: Blinking LED1 and LED2
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* Description: This C program toggle LED1 and LED2 at 1Hz by xoring P1.0 and
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* P4.7 inside a loop. The LEDs are on when P1.0=1 and P4.7=1.
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* The LED1 is initialized to be off and LED2 to be on.
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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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* | P4.7|-->LED2(GREEN)
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* | |
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* Input: None
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* Output: LED1 and LED2 blink alternately at a frequency of 1 Hz
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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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#define REDLED 0x01 // Mask for BIT0 = 0000_0001b
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#define GREENLED 0x80 // Mask for BIT7 = 1000_0000b
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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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P4DIR |= GREENLED; // Set P4.7 to output direction
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P1OUT &= ~REDLED; // LED1 is OFF
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P4OUT |= GREENLED; // LED2 is ON
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unsigned int i = 0;
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while(1) // Infinite loop
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{
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for (i = 0; i < 50000; i++); // Delay 0.5s
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// 0.5s on, 0.5s off => 1/(1s) = 1Hz
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P1OUT ^= REDLED; // Toggle LED1
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P4OUT ^= GREENLED; // Toggle LED2
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}
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}
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