main.c
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#include <msp430.h>
#include <stdint.h>
#include <stdbool.h>
#define P1_NEIGHBORS 0b11111100
#define P2_NEIGHBORS 0b11111111
#define P1_CLOCK 0b00000010
#define P1_BCAST 0b00000001
uint8_t live_neighbors_port(uint8_t port, uint8_t mask) {
uint8_t n = 0;
for (port &= mask; port; port >>= 1) {
n += port & (uint8_t)1;
}
return n;
}
int main(void) {
// stop watchdog timer or the the mcu will keep resetting.
WDTCTL = WDTPW | WDTHOLD;
// Setup Port 1
// Pin 0: Broadcast state
// Pin 1: Read clock input
// Pin 2-7: Read neighbor states
P1DIR = P1_BCAST; // only output the broadcast pin
P1OUT = 0x0;
P1REN = P1_NEIGHBORS | P1_CLOCK;
// Setup Port 2
// Pin 0-7: Read neighbor states
P2DIR = 0x0;
P2OUT = 0x0;
P2REN = P2_NEIGHBORS;
uint8_t my_state = 0;
uint8_t clk = 0;
for (;;) {
if ((clk = P1IN & P1_CLOCK)) {
uint8_t ln = live_neighbors_port(P1IN, P1_NEIGHBORS)
+ live_neighbors_port(P2IN, P2_NEIGHBORS);
while ((clk = P1IN & P1_CLOCK)); // wait for clock to fall
// Conway's Game of Life rules
if (my_state)
switch (ln) {
case 2:
case 3:
break;
default:
my_state = 0;
}
else
switch (ln) {
case 2:
my_state = 1;
}
if (my_state) {
P1OUT |= P1_BCAST;
} else {
P1OUT &= ~P1_BCAST;
}
}
}
}