Le communication challenge fait en cours ce matin. Et il fonctionne :)

challenge.c

#include "ch.h"
#include "hal.h"

#include "lcd.h"

#define SCORED_QUIZZ 1
#define TEST_QUIZZ 2

// Define this as TEST_QUIZZ or SCORED_QUIZZ
#define QUIZZ TEST_QUIZZ

// Define this as your initials
#define INITIALS "5354"

#define BAD_QUIZZ (3 - QUIZZ)

// void lcd_init(unsigned int prio);
// void lcd_char(uint8_t rs, uint8_t byte);

static char question[81];
#define ANSWER_DECL(n) \
	static char answer ## n[17];
ANSWER_DECL(0);
ANSWER_DECL(1);
ANSWER_DECL(2);
ANSWER_DECL(3);
static char * const answers[] = { answer0, answer1, answer2, answer3 };

static void fatal_error(void) {
	while (1) ;
}

static bool_t switch_pressed(void) {
	return palReadPad(GPIOC, GPIOC_SWITCH_L) == PAL_LOW;
}

static void xbee_putc(char c) {
	if (c == BAD_QUIZZ)
		fatal_error();
	sdPut(&SD3, c);
}

static void xbee_puts(const char *s) {
	while (*s)
		xbee_putc(*s++);
}

static void xbee_init(void) {
	static const SerialConfig XBeeConfig = { 9600, 0, 0, 0 };
	sdStart(&SD3, &XBeeConfig);
	chThdSleepMilliseconds(1100);
	xbee_puts("+++");
	chThdSleepMilliseconds(1100);
	xbee_puts("ATID5351,MY" INITIALS ",DH0,DL5351,CN\r");
	chThdSleepMilliseconds(100);
}

static char xbee_getc(void) {
	return sdGet(&SD3);
}

static size_t xbee_readline(char *buffer, size_t max) {
	size_t i = 0;
	while (1) {
		char c = sdGet(&SD3);
		if (c == '\n') {
			buffer[i] = 0;
			return i;
		}
		if (i == max - 1)
			fatal_error();
		buffer[i++] = c;
	}
}

static void lcd_putline(int line, const char *str) {
	// Go to the beginning of the first or second line
	lcd_char(0, 0x80 | (line ? 0x40 : 0));

	// Display up to 16 characters of str then spaces
	int i;
	for (i = 0; i < 16 && str[i]; i++)
		lcd_char(1, str[i]);
	for (; i < 16; i++)
		lcd_char(1, ' ');
}

static void start_quizz(void) {
	xbee_putc(QUIZZ);
	while (xbee_getc() != QUIZZ) ;
	if (xbee_getc() != QUIZZ || xbee_getc() != QUIZZ)
		fatal_error();
}

static void do_question(void) {
	uint8_t id = xbee_getc();

	// Read question and answers
	size_t qlen = xbee_readline(question, sizeof question);
	for (int i = 0; i < 4; i++)
		xbee_readline(answers[i], sizeof answer0);

	while (switch_pressed()) ;

	size_t q = 0;
	int i;
	for (i = 0;; i = (i + 1) % 4) {
		lcd_putline(0, question + q);
		lcd_putline(1, answers[i]);
		chThdSleepSeconds(1);
		if (switch_pressed())
			break;
		q += 16;
		if (q >= qlen)
			q = 0;
	}

	uint8_t answer = (id << 2) | i;
	xbee_putc(answer);
	xbee_putc(0);
	xbee_putc(answer);
	xbee_putc(0);
	xbee_putc(answer);
}

static void display_score(void) {
	uint8_t score = xbee_getc() & 0xf;
	lcd_putline(0, "Score:");
	if (score == 10)
		lcd_putline(1, "10");
	else {
		const char s[] = { score + '0', 0 };
		lcd_putline(1, s);
	}
}

int main(void) {
	halInit();
	chSysInit();
	lcd_init(IDLEPRIO + 1);
	lcd_putline(0, "ROSE 2013");
	lcd_putline(1, "Challenge");
	xbee_init();
	start_quizz();
	for (int i = 0; i < 10; i++)
		do_question();
	display_score();
	return 0;
}