first commit

Author: petersenna

Makefile

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+CC=msp430-gcc
+CFLAGS=-O0 -Wall -g -mmcu=msp430x2012
+
+#OBJS=main.o
+
+
+all: $(OBJS)
+	$(CC) $(CFLAGS) -o main.elf $(OBJS)
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $<
+
+clean:
+	rm -fr main.elf *.o

README

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+samples for msp430 lauchpad
+Code licensed under GPLv2

blink-leds.c

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+#include <msp430x20x2.h>
+
+#define REDLED		BIT0
+#define GREENLED	BIT6
+#define DELAY		32000
+
+int main(void) {
+	volatile unsigned int i = DELAY; // Avoid compiler optimization to
+					 // allow using counter as busy
+					 // wait loop
+
+	WDTCTL = WDTPW + WDTHOLD;	// Stop watchdog timer
+	P1DIR |= REDLED;		// Set P1.0 to output direction
+	P1DIR |= GREENLED;		// Set P1.6 to output direction
+
+	P1OUT = REDLED;			// Turn on REDLED
+
+	for(;;) {
+		i = DELAY;
+
+		P1OUT ^= REDLED;	// Switch state of REDLED
+		P1OUT ^= GREENLED;	// Switch state of GREENLED
+
+		do			// Busy wait loop for delay
+			i--;
+		while (i > 0);
+	}
+}

blink-leds2.c

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+#include <msp430x20x2.h>
+
+#define REDLED		BIT0
+#define GREENLED	BIT6
+#define DELAY		32000
+
+void delay(void);
+void init_port1(void);
+void switch_state(void);
+
+int main(void) {
+
+	init_port1();
+
+	P1OUT = REDLED;			// Turn on REDLED
+
+	for(;;) {
+		switch_state();
+		delay();
+	}
+}
+
+void delay(void)
+{
+	volatile unsigned int i = 0;	// Avoid compiler optimization to
+					// allow using counter as busy
+					// wait loop	
+	i = DELAY;
+
+	do				// Busy wait loop for delay
+		i--;
+	while (i > 0);
+}
+
+void init_port1(void)
+{
+	WDTCTL = WDTPW + WDTHOLD;	// Stop watchdog timer
+	P1DIR |= REDLED;		// Set P1.0 to output direction
+	P1DIR |= GREENLED;		// Set P1.6 to output direction
+}
+
+void switch_state(void)
+{
+	P1OUT ^= REDLED;		// Switch state of REDLED
+	P1OUT ^= GREENLED;		// Switch state of GREENLED
+}

button.c

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+#include <msp430x20x2.h>
+
+#define REDLED		BIT0
+#define GREENLED	BIT6
+#define BUTTON		BIT3
+
+int main(void) {
+	WDTCTL = WDTPW + WDTHOLD;	// Stop watchdog timer
+	P1DIR |= REDLED;		// Set P1.0 to output direction
+	P1DIR |= GREENLED;		// Set P1.6 to output direction
+
+	P1OUT = 0x00;			// Turn off both LEDS
+
+	for(;;) {
+		if ((P1IN & BUTTON) == BUTTON)
+			P1OUT = REDLED;	// BUTTON RELEASED
+		else
+			P1OUT = GREENLED; // BUTTON PRESSED
+	}
+}

button2.c

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+#include <msp430x20x2.h>
+
+#define REDLED		BIT0
+#define GREENLED	BIT6
+#define BUTTON		BIT3
+
+//Delay is DELAY * DELAX
+#define DELAY		1
+#define DELAX		7500
+
+void delay(void);
+void green(void);
+void init_port1(void);
+void red(void);
+
+int main(void) {
+	int button_status = 0x00;	// 0x00 - released
+					// 0x01 - pressed
+	init_port1();
+
+	P1OUT = REDLED;			// Turn on only REDLED
+
+	for(;;) {
+		// If button is pressed
+		if (!((P1IN & BUTTON) == BUTTON))
+			button_status ^= 0x01;	// Switch state
+
+		if (button_status == 0x01)
+			green();
+		else
+			red();
+		delay();
+	}
+}
+
+void delay(void)
+{
+	volatile unsigned int i, j;	// Avoid compiler optimization to
+					// allow using counter as busy
+					// wait loop
+
+	for (i = 0; i <= DELAY; i++)	// Busy wait loop DELAY * DELAX
+		for (j = 0; j <= DELAX; j++) {}
+}
+
+void green(void)
+{
+	P1OUT = GREENLED;
+}
+
+void init_port1(void)
+{
+	WDTCTL = WDTPW + WDTHOLD;	// Stop watchdog timer
+
+	P1DIR = 0x00;			// Set all ports to input direction
+					// This is not needed
+
+	P1DIR |= REDLED;		// Set P1.0 to output direction
+	P1DIR |= GREENLED;		// Set P1.6 to output direction
+}
+
+void red(void)
+{
+	P1OUT = REDLED;
+}
+