From 62d54ff86ddc6d91154c144ba092bb5103943d49 Mon Sep 17 00:00:00 2001
From: Sadeep Madurange <sadeep@asciimx.com>
Date: Fri, 11 Apr 2025 15:46:49 +0800
Subject: Ding reliably working with btn.

---
 ding.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 48 insertions(+), 7 deletions(-)

(limited to 'ding.c')

diff --git a/ding.c b/ding.c
index 2bf9fe6..548c618 100644
--- a/ding.c
+++ b/ding.c
@@ -17,7 +17,42 @@
 #define RX_PCMSK       PCMSK2
 #define RX_PCINTVEC    PCINT2_vect
 
+#define LOCK_PIN       PC5
+#define LOCK_DDR       DDRC
+#define LOCK_PORT      PORTC
+#define LOCK_PCIE      PCIE1
+#define LOCK_PCINT     PCINT13 
+#define LOCK_PCMSK     PCMSK1
+#define LOCK_PCINTVEC  PCINT1_vect
+
 static volatile int rxdr = 0;
+static volatile int lock = 0;
+
+static inline void init_rx(void)
+{
+	RX_DDR &= ~(1 << RX_PIN);
+	RX_PORT |= (1 << RX_PIN); 
+	PCICR |= (1 << RX_PCIE);
+	RX_PCMSK |= (1 << RX_PCINT);
+}
+
+static inline void init_btns(void)
+{
+	LOCK_DDR &= ~(1 << LOCK_PIN);
+	LOCK_PORT |= (1 << LOCK_PIN);
+	PCICR |= (1 << LOCK_PCIE);
+	LOCK_PCMSK |= (1 << LOCK_PCINT);
+}
+
+static inline int is_btn_pressed(unsigned char btn)
+{
+	if (!((PINC >> btn) & 0x01)) {
+		_delay_us(2000);
+		return !((PINC >> btn) & 0x01);
+	}
+	
+	return 0;
+}
 
 int main(void)
 {
@@ -27,6 +62,9 @@ int main(void)
 	uint8_t rxaddr[ADDRLEN] = { 194, 178, 82 };
 	uint8_t txaddr[ADDRLEN] = { 194, 178, 83 };
 
+	init_rx();
+	init_btns();
+
 	//wdt_stop();
 	uart_init();
 	radio_init(rxaddr);
@@ -35,9 +73,6 @@ int main(void)
 	sei();
 	radio_listen();
 
-	_delay_ms(2000);
-	radio_sendto(txaddr, "SYN", 3);
-
 	for (;;) {
 		if (rxdr) {
 			n = radio_recv(buf, MAXPDLEN);
@@ -47,12 +82,12 @@ int main(void)
 				uart_write("INFO: ");
 				uart_write_line(buf);
 			}
-		} else {
-			uart_write_line("No IRQ");
 		}
 
-		_delay_ms(2000);
-		radio_sendto(txaddr, "SYN", 3);
+		if (lock) {
+			radio_sendto(txaddr, "SYN", 3);
+			lock = 0;
+		}
 	}
 
 	return 0;
@@ -62,3 +97,9 @@ ISR(RX_PCINTVEC)
 {
 	rxdr = 1;
 }
+
+ISR(LOCK_PCINTVEC)
+{
+	if (is_btn_pressed(LOCK_PIN))	
+		lock = 1;
+}
-- 
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