From 0adb6c825ea194c455a377d0570c596d933f317e Mon Sep 17 00:00:00 2001
From: Sadeep Madurange <sadeep@asciimx.com>
Date: Sun, 17 Nov 2024 13:56:46 +0800
Subject: RF tests.

---
 rf_test/recv.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 rf_test/recv.c

(limited to 'rf_test/recv.c')

diff --git a/rf_test/recv.c b/rf_test/recv.c
new file mode 100644
index 0000000..e5764a7
--- /dev/null
+++ b/rf_test/recv.c
@@ -0,0 +1,85 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <util/setbaud.h>
+
+#define LOCK_LED    PD6
+#define UNLOCK_LED  PD7
+
+#define SYN         0xA4
+#define ADDR        0x01
+#define LOCK_CMD    0x02
+#define UNLOCK_CMD  0x03
+
+static void usart_init(void)
+{
+	UBRR0H = UBRRH_VALUE;
+	UBRR0L = UBRRL_VALUE;
+#if USE_2X
+	UCSR0A |= (1 << U2X0);
+#else
+	UCSR0A &= ~(1 << U2X0);
+#endif
+	UCSR0B = (1 << TXEN0) | (1 << RXEN0);
+	UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
+}
+
+static unsigned char usart_recv(void)
+{
+	while((UCSR0A & (1 << RXC0)) == 0);
+	return UDR0;
+}
+
+static void led_init(void)
+{
+	DDRD |= (1 << LOCK_LED) | (1 << UNLOCK_LED);
+	PORTD |= (1 << LOCK_LED) | (1 << UNLOCK_LED);
+}
+
+int main(void)
+{
+	usart_init();
+	led_init();
+
+	sei();
+
+	for (;;)
+		;
+
+	return 0;
+}
+
+static inline int is_btn_pressed(unsigned char btn)
+{
+	if (!((PIND >> btn) & 0x01)) {
+		_delay_us(2000);
+		return !((PIND >> btn) & 0x01);
+	}
+	
+	return 0;
+}
+
+ISR(USART_RX_vect)
+{
+	unsigned char addr, data, chk;
+
+	addr = usart_recv();
+	data = usart_recv();
+	chk = usart_recv();
+
+	if(chk == (addr + data))
+	{
+		if(addr == ADDR)
+		{
+			if(data == LOCK_CMD) {
+				PORTC |= (1 << LOCK_LED);
+				PORTC &= ~(1 << UNLOCK_LED);
+				
+			} else if (data == UNLOCK_LED) {
+				PORTC |= (1 << UNLOCK_LED);
+				PORTC &= ~(1 << LOCK_LED);
+			}
+		}
+	}
+	
+}
-- 
cgit v1.2.3