demo.tex

\documentclass[12pt]{article}
\usepackage{listings,geometry}
\geometry{letterpaper,margin=0.3in}

\begin{document}
\large{\underline{Gravity Well} - EE 319K lab 10 (Sameer Bibikar, Sneha Pendharkar)}
\lstset{basicstyle=\normalsize\ttfamily,language=C,breaklines=true,columns=fullflexible,keepspaces=true}
\begin{lstlisting}
// [input/portf.c] ISR for edge triggered interrupts, using queue
void GPIOPortF_Handler() {
	if (systick_getms() - ms1 < 10) {
		GPIO_PORTF_ICR_R = 0x11;
		return; // If the button was pushed twice in 10 ms, ignore it.
	}
	Queue *event_queue = get_event_queue();
	if (GPIO_PORTF_RIS_R & 0x01) {
		queue_offer(event_queue, 0);
		GPIO_PORTF_ICR_R = 0x01; // acknowledge flag on PF0
	}
	if (GPIO_PORTF_RIS_R & 0x10) {
		queue_offer(event_queue, 4);
		GPIO_PORTF_ICR_R = 0x10; // acknowledge flag on PF4
	}
	ms1 = systick_getms();
}
// [game/game.c] Generate new bonuses
if (!stack_empty(&bonus_stack)) {
	if (++bonus_spawn_index % BONUS_SPAWN_FRAMES == 0) {
		// Spawn bonuses randomly. Some have better chances than others.
		uint16_t i = stack_pop(&bonus_stack); // Get unused memory space
		bonus_arr[i].posX = ship.posX + srandom() % 160000 - 80000;
		bonus_arr[i].posY = ship.posY - SHIP_DISPLAY_Y*1000 - srandom() % 10000;
		bonus_arr[i].type = BONUS_SCORE; // by default, spawn score objects
		// Assign bonus types by random:
		uint16_t chooser = srandom() % 1000;
		if (chooser < 500) bonus_arr[i].type = BONUS_HEALTH;
		if (chooser < 300) bonus_arr[i].type = BONUS_ATTACK;
		if (chooser < 100) bonus_arr[i].type = BONUS_ERASE;
	}
}
// [display/buffer.c] Efficiently write the buffer to the display
void buffer_write() {
	ST7735_SetWindow(0, 0, DISPLAY_WIDTH, DISPLAY_HEIGHT);
	for (uint8_t i = 0; i < DISPLAY_HEIGHT; i++) {
		for (uint8_t j = 0; j < DISPLAY_WIDTH; j++) {
			ST7735_PushColor(buffer_displaycolor(buffer[j][i]));
		}
	}
}
// [display/buffer.c] Use recursion to draw a number onto the display
static void buffer_num_helper(int16_t *x, int16_t y, int32_t n, uint8_t color) {
	if (n/10 != 0) buffer_num_helper(x, y, n/10, color);
	buffer_char(*x, y, n%10+48, color);
	(*x)+=6;
}
void buffer_num(int16_t x, int16_t y, int32_t n, uint8_t color) {
	buffer_num_helper(&x, y, n, color);
}
\end{lstlisting}
\end{document}