sort of works, with all 6 lines

blink.c

@@ -2,18 +2,25 @@
 
 unsigned int i = 0;
 
+unsigned char bits1 = BIT0 + BIT1 + BIT2 + BIT3 + BIT4 + BIT5 + BIT6 + BIT7;
+unsigned char bits2 = BIT0 + BIT1 + BIT2 + BIT3 + BIT4 + BIT5;
+
 int
 main(void)
 {
 	WDTCTL = WDTPW + WDTHOLD;
-	P1DIR |= BIT0 + BIT6;
-	P1OUT = (P1OUT & ~BIT6) | BIT0;
+	P1DIR |= bits1;
+	P2DIR |= bits2;
+
+	P1OUT |= bits1;
+	P2OUT &= ~bits2;
 
 	for (;;) {
-		i = (i + 1) % 1000;
+		i = (i + 1) % 40000;
 		
 		if (i == 0) {
-			P1OUT ^= BIT0 + BIT6;
+			P1OUT ^= bits1;
+			P2OUT ^= bits2;
 		}
 	}		
 

main.c

@@ -1,5 +1,6 @@
 #include <msp430.h>
 #include <stdint.h>
+#include <stdbool.h>
 
 const uint8_t digits[] = {
 	0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f,
@@ -10,27 +11,101 @@ const uint8_t digits[] = {
 volatile uint16_t jiffies = 0;
 unsigned int i = 0;
 
+#define MODE BIT0
+#define SIN BIT1
+#define SCLK BIT2
+#define XLAT BIT3
+#define BLANK BIT4
+#define GSCLK BIT5
+
+#define bit(pin, bit, on) pin = (on ? (pin | bit) : (pin & ~bit))
+
+#define mode(on) bit(P1OUT, MODE, on)
+#define sin(on) bit(P1OUT, SIN, on)
+#define sclk(on) bit(P1OUT, SCLK, on)
+#define xlat(on) bit(P1OUT, XLAT, on)
+#define blank(on) bit(P1OUT, BLANK, on)
+#define gsclk(on) bit(P1OUT, GSCLK, on)
+
+void
+latch()
+{
+	xlat(true);
+	xlat(false);
+}
+
+void
+write(uint16_t number)
+{
+	int i;
+	int j;
+	
+	// MSB first
+	for (i = 15; i >= 0; i -= 1) {
+		sin(number & (1 << i));
+
+		for (j = 0; j < 12; j += 1) {
+			sclk(true);
+			sclk(false);
+		}
+	}
+}
+
+void
+blip()
+{
+	int i;
+	
+	for (i = 0; i < 1000; i += 1) {
+		__delay_cycles(1000);
+	}
+}
+
 int
 main(void)
 {
 	WDTCTL = WDTPW + WDTHOLD;	// Disable Watchdog Timer
-	P1DIR |= BIT0 + BIT6;		// P1.0 output
-	P1OUT = (P1OUT & ~BIT6) | BIT0;
+	P1DIR |= MODE + SIN + SCLK + XLAT + BLANK + GSCLK + BIT6;		// P1 output bits
+
+	P1OUT = 0;
+		
+	// Set up the stupid DC crappo
+	mode(true);
+	sin(false);
+	for (i = 0; i < 96; i += 1) {
+		sclk(true);
+		sclk(false);
+	}
+	latch();
+	mode(false);
+		
+	// Zero out numbers
+	sin(false);
+	for (i = 0; i < 192; i += 1) {
+		sclk(true);
+		sclk(false);
+	}
+	latch();
+	
 
 #if 1
-	CCTL0 |= CCIE;		// Trigger interrup on Timer A checkpoint
+	CCTL0 |= CCIE;		// Trigger interrup on   A checkpoint
 	TACTL = TASSEL_2 + MC_1;		// Set timer A to SMCLCK, up mode
 	TACCR0 = 0x4444;
 	
 	__enable_interrupt();
 #endif
 
+	// Now actually run
 	for (;;) {
-		i = (i + 1) % 1000;
-		if ((jiffies / 60) % 2) {
-			P1OUT &= ~BIT0;
+		if ((jiffies % 60) == 0) {
+			write(0xffff);
+	
+			blank(true);
+			latch();
+			blank(false);
 		} else {
-			P1OUT |= BIT0;
+			P1OUT ^= GSCLK;
 		}
 	}
 }