Door lock with MOSFETs and and without RFM.HEADmaster

1 files changed, 89 insertions, 0 deletions

diff --git a/door_lock_rfm/util.c b/door_lock_rfm/util.c
new file mode 100644
index 0000000..ec5369e
--- /dev/null
+++ b/door_lock_rfm/util.c
@@ -0,0 +1,89 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+
+#include "util.h"
+
+#define LOCK_LED      PC3
+#define UNLOCK_LED    PC4
+#define BATLOW_LED    PC5
+#define LED_DDR       DDRC
+#define LED_PORT      PORTC
+
+int is_btn_pressed(uint8_t pin, uint8_t btn)
+{
+	if (!((pin >> btn) & 0x01)) {
+		_delay_ms(100);
+		return !((pin >> btn) & 0x01);
+	}
+	return 0;
+}
+
+void xor(const char *k, const char *s, char *d, uint8_t n)
+{
+	int i;
+
+	for (i = 0; i < n; i++)
+		d[i] = s[i] ^ k[i];
+}
+
+/* Measure vcc by measuring known internal 1.1v bandgap
+ * reference voltage against AVCC.
+ * Place a 100nF bypass capacitor on AREF.
+ */
+uint16_t getvcc(void)
+{
+	uint16_t vcc;
+
+	ADMUX |= (1 << REFS0);
+	ADMUX |= (1 << MUX3) | (1 << MUX2) | (1 << MUX1);
+	ADCSRA |= (1 << ADEN) | (1 << ADPS2) | (1 << ADPS0);
+
+	// https://www.sciencetronics.com/greenphotons/?p=1521
+	_delay_us(500);
+
+	ADCSRA |= (1 << ADSC);
+	while (ADCSRA & (1 << ADSC))
+		; 
+	vcc = (1100UL * 1023 / ADC);
+
+	ADCSRA &= ~(1 << ADEN);
+	return vcc;
+}
+
+void led_init(void) 
+{
+	LED_DDR |= (1 << LOCK_LED) | (1 << UNLOCK_LED);
+	LED_DDR |= (1 << BATLOW_LED);
+
+	LED_PORT &= ~(1 << LOCK_LED);
+	LED_PORT &= ~(1 << UNLOCK_LED);
+	LED_PORT &= ~(1 << BATLOW_LED);
+}
+
+void led_locked(void)
+{
+	LED_PORT |= (1 << LOCK_LED);
+	_delay_ms(100);
+	LED_PORT &= ~(1 << LOCK_LED);
+	_delay_ms(100);
+	LED_PORT |= (1 << LOCK_LED);
+	_delay_ms(100);
+	LED_PORT &= ~(1 << LOCK_LED);
+}
+
+void led_unlocked(void)
+{
+	LED_PORT |= (1 << UNLOCK_LED);
+	_delay_ms(70);
+	LED_PORT &= ~(1 << UNLOCK_LED);
+	_delay_ms(70);
+	LED_PORT |= (1 << UNLOCK_LED);
+	_delay_ms(70);
+	LED_PORT &= ~(1 << UNLOCK_LED);
+}
+
+void led_bat(void)
+{
+	LED_PORT ^= (1 << BATLOW_LED);
+}