XMEGA-A1 Xplained demo application.

#include <board.h>
#include <compiler.h>
#include <gpio.h>
#include <nvm.h>
#include <sysclk.h>
#include <tc.h>
#include <conf_example.h>
#include "sound.h"
#include <util/delay.h>

Macros
#define	F_CPU sysclk_get_cpu_hz()

#define	SEQUENCE_BUFFER_MAX_LENGTH 255
	Maximum length of buffer for button press sequence. More...

#define	SEQUENCE_HEADER_LENGTH 2
	Length of header for saving button presses to EEPROM. More...

Enumerations
enum	game_mode { GAME_RECORD_MODE, GAME_PLAY_MODE }
	Enumeration of game modes. More...

enum	sound_mode { SOUND_SAMPLES, SOUND_SINEWAVE }
	Enumeration of sound playback modes. More...

Functions
int	main (void)
	Main function. More...

void	timeout_callback (void)
	Timer/counter overflow interrupt callback function. More...

Internal application functions
static void	start_debounce_timer (void)
	Set up and start timer for debouncing of the push buttons. More...

static void	init_save_timer (void)
	Set up timer for measuring inactivity before saving. More...

static void	start_save_timer (void)
	Start timer for measuring inactivity before saving. More...

static void	play_game (uint8_t buttons, enum sound_mode soundmode, enum game_mode *gamemode)
	Compares button presses with stored game data. More...

static void	record_buttons (uint8_t buttons, enum sound_mode soundmode)
	Record button presses and play sound. More...

static void	save_gamedata (void)
	Save current game data to EEPROM. More...

static void	load_gamedata (void)
	Load game data from EEPROM. More...

Variables
static volatile uint8_t	save_timeout
	Counter for timeout-period before saving button sequence. More...

uint8_t	sequence_buffer [SEQUENCE_BUFFER_MAX_LENGTH]
	Buffer to contain the button press sequence. More...

uint8_t	sequence_buffer_length
	Length of currently recorded button sequence in buffer. More...

#define F_CPU sysclk_get_cpu_hz()

#define SEQUENCE_BUFFER_MAX_LENGTH 255

Maximum length of buffer for button press sequence.

Referenced by load_gamedata(), main(), and save_gamedata().

#define SEQUENCE_HEADER_LENGTH 2

Length of header for saving button presses to EEPROM.

Referenced by main(), play_game(), and record_buttons().

enum game_mode

Enumeration of game modes.

Enumerator
GAME_RECORD_MODE	Record button presses for the game.
GAME_PLAY_MODE	Play game with recorded button sequence.

enum sound_mode

Enumeration of sound playback modes.

Enumerator
SOUND_SAMPLES	One-shot playback of samples.
SOUND_SINEWAVE	Looped playback of sinewaves.

void init_save_timer ( void )

static

Set up timer for measuring inactivity before saving.

The timer/counter is set up in normal, up-counting mode with a period of approximately 1.6 seconds.

References PMIC_LVL_LOW, sysclk_get_per_hz(), tc_enable(), tc_set_overflow_interrupt_callback(), tc_set_overflow_interrupt_level(), tc_write_period(), and timeout_callback().

Referenced by main().

void load_gamedata ( void )

static

Load game data from EEPROM.

References nvm_eeprom_read_byte(), sequence_buffer, and SEQUENCE_BUFFER_MAX_LENGTH.

Referenced by main().

int main ( void )

Main function.

Initializes the board, checks the jumper configuration and sets up the game accordingly before the main loop is entered. The main loop is where the state of the board buttons is read out and passed on to the game functions record_buttons or play_game, depending on the state of the game.

References board_init(), cpu_irq_enable, GAME_PLAY_MODE, GAME_RECORD_MODE, gpio_configure_pin, gpio_pin_is_low, init_save_timer(), IOPORT_DIR_INPUT, IOPORT_DIR_OUTPUT, IOPORT_INIT_LOW, IOPORT_PULL_UP, load_gamedata(), play_game(), pmic_enable_level(), PMIC_LVL_LOW, record_buttons(), save_gamedata(), save_timeout, sequence_buffer, sequence_buffer_length, SEQUENCE_BUFFER_MAX_LENGTH, SEQUENCE_HEADER_LENGTH, sound_init(), SOUND_SAMPLES, SOUND_SINEWAVE, start_debounce_timer(), start_save_timer(), and sysclk_init().

void play_game	(	uint8_t	buttons,
		enum sound_mode	soundmode,
		enum game_mode *	gamemode
	)

static

Compares button presses with stored game data.

Uses a timer to debounce buttons. The method used requires the function to be called often, but not necessarily regularly.

Parameters

buttons	Mask with pressed buttons.
soundmode	Indicates whether to play a sound sample or sinewave.
gamemode	Game mode pointer – the mode is changed if the game is won.

References GAME_RECORD_MODE, save_timeout, sequence_buffer, sequence_buffer_length, SEQUENCE_HEADER_LENGTH, sound_is_playing(), sound_play_note(), sound_play_sample(), SOUND_SAMPLES, SOUND_SINEWAVE, sound_stop_timer(), start_save_timer(), tc_clear_overflow(), and tc_is_overflow().