Offload I2C work onto interrupts. For now, we just spin while waiting

for the I2C activity to complete.

main.c

@@ -160,6 +160,7 @@ void average_sample(void)
 
 int main(void) {
 	int i;
+
 	init_interrupt();
 	init_uart();
 	init_i2c();
@@ -193,8 +194,6 @@ int main(void) {
 			reply("Help is not available. Try a psychiatrist.");
 			break;
 		case 'T':
-			putstr("I2C status was: ");
-			puthex(i2cstat);
 			putstr(" I2C status is: ");
 			puthex(i2c_statreg());
 			reply(".");
@@ -202,18 +201,6 @@ int main(void) {
 			puthex(i2c_conreg());
 			reply(".");
 			break;
-		case 'S':
-			putstr("Sending START... ");
-			if (i2c_send_start())
-				reply("OK");
-			else
-				reply("FAIL");
-			break;
-		case 'O':
-			putstr("Sending STOP... ");
-			i2c_send_stop();
-			reply("sent");
-			break;
 		case 'I':
 			putstr("Initialising WMP... ");
 			if (wmp_init())