From a3a63e64d00a6554f935d574358c88afb453b09d Mon Sep 17 00:00:00 2001
From: Sadeep Madurange <sadeep@asciimx.com>
Date: Sat, 7 Jun 2025 14:26:01 +0800
Subject: FPM and the buttons.

---
 main.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 main.c

(limited to 'main.c')

diff --git a/main.c b/main.c
new file mode 100644
index 0000000..abc5b1b
--- /dev/null
+++ b/main.c
@@ -0,0 +1,99 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <avr/wdt.h>
+#include <avr/sleep.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+
+#include "fpm.h"
+
+#define FRONT_UNLOCK_PIN   PD2
+#define FRONT_LOCK_PIN     PD3
+#define ENROLL_PIN         PD4
+#define BACK_LOCK_PIN      PD5
+#define BACK_UNLOCK_PIN    PD6
+
+#define INPUT_DDR          DDRD
+#define INPUT_PORT         PORTD
+
+#define FPM_UNLOCK_INT     INT0
+#define FPM_INT_VEC        INT0_vect
+
+#define FRONT_LOCK_INT     PCINT19
+#define ENROLL_INT         PCINT20
+#define BACK_LOCK_INT      PCINT21
+#define BACK_UNLOCK_INT    PCINT22
+#define BTN_INT_VEC        PCINT2_vect
+
+int main(void)
+{
+	/* input ports */
+	INPUT_DDR &= ~((1 << BACK_LOCK_PIN) | (1 << BACK_UNLOCK_PIN) | 
+	               (1 << FRONT_LOCK_PIN) | (1 << FRONT_UNLOCK_PIN) | 
+	               (1 << ENROLL_PIN));
+
+	INPUT_PORT |= ((1 << BACK_LOCK_PIN) | (1 << BACK_UNLOCK_PIN) | 
+	               (1 << FRONT_LOCK_PIN) | (1 << FRONT_UNLOCK_PIN) | 
+	               (1 << ENROLL_PIN));
+
+	EICRA = 0b00000000;
+	EIMSK = (1 << FPM_UNLOCK_INT);
+
+	PCICR |= (1 << PCIE2);
+	PCMSK2 |= ((1 << FRONT_LOCK_INT) | (1 << ENROLL_INT) | 
+	           (1 << BACK_LOCK_INT) | (1 << BACK_UNLOCK_INT));
+
+	fpm_init();
+	sei();
+
+	for (;;) {
+	}
+
+	return 0;
+}
+
+static inline int is_pressed(uint8_t btn)
+{
+	if (!((PIND >> btn) & 0x01)) {
+		_delay_ms(50);
+		return !((PIND >> btn) & 0x01);
+	}
+	return 0;
+}
+
+ISR(FPM_INT_VEC)
+{
+	cli();
+
+	if (fpm_match()) {
+		fpm_led(BREATHE, BLUE, 1);
+	} else {
+		fpm_led(BREATHE, RED, 1);
+	}
+
+	sei();
+}
+
+ISR(BTN_INT_VEC)
+{
+	uint16_t id;
+
+	cli();
+
+	if (is_pressed(FRONT_LOCK_PIN)) {
+		fpm_led(FLASH, RED, 1);
+	} else if (is_pressed(BACK_LOCK_PIN)) {
+	} else if (is_pressed(BACK_UNLOCK_PIN)) {
+	} else if (is_pressed(ENROLL_PIN)) {
+		id = fpm_match();
+		if (id == 1 || id == 2) {
+			fpm_led(BREATHE, BLUE, 1);
+			_delay_ms(1000);
+			if (fpm_enroll())
+				fpm_led(BREATHE, BLUE, 1);
+		} else
+			fpm_led(BREATHE, RED, 1);
+	}
+
+	sei();
+}
-- 
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