wip: attempt with basic RF modules.

1 files changed, 37 insertions, 50 deletions

diff --git a/rf_test/recv.c b/rf_test/recv.c
index a908bbe..9cb3daa 100644
--- a/rf_test/recv.c
+++ b/rf_test/recv.c
@@ -1,80 +1,67 @@
 #include <avr/io.h>
 #include <avr/interrupt.h>
 #include <util/delay.h>
-#include <util/setbaud.h>
 
 #define TEST_LED    PB1
 #define LOCK_LED    PD6
 #define UNLOCK_LED  PD7
 
-#define SYN    0xA1
-#define FIN    0xB2
-#define LOCK   0xC3
-#define UNLOCK 0xD3
+#define SYN    0xAA
+#define LOCK   0xB5
+#define UNLOCK 0xAE
 
-static void usart_init(void)
-{
-	UBRR0H = UBRRH_VALUE;
-	UBRR0L = UBRRL_VALUE;
-	UCSR0B = (1 << RXEN0) | (1 << RXCIE0);
-	UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
-}
+#define SIGPIN PB3
+#define SIGLEN 200
+
+static volatile unsigned char data = 0;
 
-static unsigned char usart_recv(void)
+static inline void led_init(void)
 {
-	while((UCSR0A & (1 << RXC0)) == 0);
-	return UDR0;
+	DDRB  |= (1 << TEST_LED);
+	DDRD  |= (1 << LOCK_LED) | (1 << UNLOCK_LED);
 }
 
-static void led_init(void)
+static inline void pcint2_init(void)
 {
-	DDRB |= (1 << TEST_LED);
-	DDRD |= (1 << LOCK_LED) | (1 << UNLOCK_LED);
-	PORTD |= (1 << LOCK_LED) | (1 << UNLOCK_LED);
+    PCICR |= (1 << PCIE2);
+    PCMSK2 |= (1 << PCINT2);
 }
 
 int main(void)
 {
-	usart_init();
+	DDRB &= ~(1 << SIGPIN);
+	PORTB &= ~(1 << SIGPIN);
+
 	led_init();
+	pcint2_init();
 
 	sei();
 
-	for (;;)
-		;
+	for (;;) {
+		if (data == LOCK) {
+			PORTD |= (1 << LOCK_LED);
+			PORTD &= ~(1 << UNLOCK_LED);
+		}
+
+		if (data == UNLOCK) {
+			PORTD &= ~(1 << LOCK_LED);
+			PORTD |= (1 << UNLOCK_LED);
+		}
+
+		data = 0;
+		_delay_ms(100);
+	}
 
 	return 0;
 }
 
-ISR(USART_RX_vect)
+ISR(PCINT2_vect)
 {
-	unsigned char data, buf;
-
-	data = 0;
-	buf = usart_recv();
-	
-	if (buf == SYN) {
-		buf = usart_recv();
-
-		while (buf != FIN) {
-			buf = usart_recv();
-
-			if (buf == SYN) {
-				PORTB ^= (1 << TEST_LED);
-				return;
-			}
-
-			if (buf != FIN)
-				data = buf;
-		}
+	int n, bit;
 
-		if(data == LOCK) {
-			PORTD |= (1 << LOCK_LED);
-			PORTD &= ~(1 << UNLOCK_LED);
-		} else if (data == UNLOCK) {
-			PORTD |= (1 << UNLOCK_LED);
-			PORTD &= ~(1 << LOCK_LED);
-		}
+	for (n = 7; n >= 0; n--) {
+		_delay_ms(SIGLEN);
+		bit = ((PINB >> SIGPIN) & 1);	
+		data = bit == 1 ? (data | (1 << n)) : (data & ~(1 << n));
 	}
-
 }