/* the main game function */
static int play_game()
{
ALLEGRO_TIMER *inc_counter;
int gameover = 0;
int cyclenum = 0;
/* init */
score = 0;
init_view();
init_player();
init_badguys();
init_bullets();
init_explode();
init_message();
#define TIMER_SPEED ALLEGRO_BPS_TO_SECS(30*(cyclenum+2))
inc_counter = al_create_timer(TIMER_SPEED);
al_start_timer(inc_counter);
while (!gameover) {
/* move everyone */
while ((al_get_timer_count(inc_counter) > 0) && (!gameover)) {
update_view();
update_bullets();
update_explode();
update_message();
if (update_badguys()) {
if (advance_view()) {
cyclenum++;
al_set_timer_count(inc_counter, 0);
lay_attack_wave(TRUE);
advance_player(TRUE);
}
else {
lay_attack_wave(FALSE);
advance_player(FALSE);
}
}
gameover = update_player();
al_set_timer_count(inc_counter, al_get_timer_count(inc_counter)-1);
}
/* take a screenshot? */
if (key[ALLEGRO_KEY_PRINTSCREEN]) {
static int ss_count = 0;
char fname[80];
sprintf(fname, "speed%03d.tga", ++ss_count);
al_save_bitmap(fname, al_get_backbuffer(screen));
while (key[ALLEGRO_KEY_PRINTSCREEN])
poll_input_wait();
al_set_timer_count(inc_counter, 0);
}
/* toggle fullscreen window */
if (key[ALLEGRO_KEY_F]) {
int flags = al_get_display_flags(screen);
al_set_display_flag(screen, ALLEGRO_FULLSCREEN_WINDOW,
!(flags & ALLEGRO_FULLSCREEN_WINDOW));
while (key[ALLEGRO_KEY_F])
poll_input_wait();
}
/* draw everyone */
draw_view();
}
/* cleanup */
al_destroy_timer(inc_counter);
shutdown_view();
shutdown_player();
shutdown_badguys();
shutdown_bullets();
shutdown_explode();
shutdown_message();
if (gameover < 0) {
sfx_ping(1);
return FALSE;
}
return TRUE;
}
void SysTick_Handler(void){
static bool lowBat; // Set when battery voltage drops below VBAT_LOW
static uint32_t sysTickCounter;
sysTickCounter++; // Used to schedule less frequent tasks
switch(system_state){
case STATE_IDLE:
// Enable USB if VBUS is disconnected
;bool vBus = Chip_GPIO_GetPinState(LPC_GPIO, 0, VBUS);
if(!vBus){
msc_state = MSC_ENABLED;
}
// If MSC enabled, VBUS is connected, and SD card is ready, try to connect as MSC
if (msc_state == MSC_ENABLED && vBus && sd_state == SD_READY){
f_mount(NULL,"",0); // unmount file system
if (msc_init() == MSC_OK){
Board_LED_Color(LED_YELLOW);
system_state = STATE_MSC;
break;
}else{ // Error on MSC initialization
error(ERROR_MSC_INIT);
}
}
// If user has short pressed PB and SD card is ready, initiate acquisition
if (pb_shortPress() && sd_state == SD_READY){
daq_init();
system_state = STATE_DAQ;
break;
}
// Blink LED if in low battery state, otherwise solid green
if (lowBat && sysTickCounter % TICKRATE_HZ1 < TICKRATE_HZ1/2){
Board_LED_Color(LED_OFF);
} else {
Board_LED_Color(LED_GREEN);
}
break;
case STATE_MSC:
// If VBUS is disconnected or button is short pressed
;bool pb;
if (Chip_GPIO_GetPinState(LPC_GPIO, 0, VBUS) == 0 || (pb = pb_shortPress())){
if(pb){
msc_state = MSC_DISABLED;
}
msc_stop();
f_mount(fatfs,"",0); // mount file system
Board_LED_Color(LED_GREEN);
system_state = STATE_IDLE;
enterIdleTime = Chip_RTC_GetCount(LPC_RTC);
}
break;
case STATE_DAQ:
// Perform the current asynchronous daq action
daq_loop();
// If user has short pressed PB to stop acquisition
if (pb_shortPress()){
Board_LED_Color(LED_PURPLE);
daq_stop();
Board_LED_Color(LED_GREEN);
system_state = STATE_IDLE;
enterIdleTime = Chip_RTC_GetCount(LPC_RTC);
msc_state = MSC_DISABLED;
}
break;
}
// Initialize SD card after every insertion
if (Chip_GPIO_GetPinState(LPC_GPIO, 0, CARD_DETECT)){
// Card out
Board_LED_Color(LED_CYAN);
sd_state = SD_OUT;
}else{
// Card in
if (sd_state == SD_OUT){
// Delay 100ms to let connections and power stabilize
DWT_Delay(100000);
if(init_sd_spi(&cardinfo) != SD_OK) {
error(ERROR_SD_INIT);
}
switch(system_state){
case STATE_IDLE:
Board_LED_Color(LED_GREEN);
break;
case STATE_MSC:
Board_LED_Color(LED_YELLOW);
break;
case STATE_DAQ:
Board_LED_Color(LED_RED);
break;
}
sd_state = SD_READY;
}
}
/* Run once per second */
if(sysTickCounter % TICKRATE_HZ1 == 0){
float vBat = read_vBat(10);
lowBat = vBat < VBAT_LOW ? true : false; // Set low battery state
if (vBat < VBAT_SHUTDOWN){
shutdown_message("Low Battery");
}
if ((Chip_RTC_GetCount(LPC_RTC) - enterIdleTime > TIMEOUT_SECS && system_state == STATE_IDLE) ){
shutdown_message("Idle Time Out");
}
}
/* Shut down conditions */
if (pb_longPress()){
shutdown_message("Power Button Pressed");
}
/* Handle errors */
error_handler();
}
