From 52112f19821f6f667c51f3ac2c68da41365e0b43 Mon Sep 17 00:00:00 2001
From: Sadeep Madurange <sadeep@asciimx.com>
Date: Fri, 11 Apr 2025 13:25:11 +0800
Subject: wip: some packets are being exchanged, after about 3 packets they
 fail (WDT)

---
 ding.c | 43 ++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 38 insertions(+), 5 deletions(-)

(limited to 'ding.c')

diff --git a/ding.c b/ding.c
index 34ff38c..2bf9fe6 100644
--- a/ding.c
+++ b/ding.c
@@ -1,6 +1,7 @@
 #include <stdint.h>
 #include <string.h>
 
+#include <avr/interrupt.h>
 #include <avr/wdt.h>
 #include <util/delay.h>
 
@@ -8,24 +9,56 @@
 #include "uart.h"
 #include "util.h"
 
+#define RX_PIN         PD7
+#define RX_DDR         DDRD
+#define RX_PORT        PORTD
+#define RX_PCIE        PCIE2
+#define RX_PCINT       PCINT23
+#define RX_PCMSK       PCMSK2
+#define RX_PCINTVEC    PCINT2_vect
+
+static volatile int rxdr = 0;
+
 int main(void)
 {
-	const char *s = "hello world!";
-	uint8_t slen = strlen(s);
+	uint8_t n;
+	char buf[MAXPDLEN + 1];
 
 	uint8_t rxaddr[ADDRLEN] = { 194, 178, 82 };
 	uint8_t txaddr[ADDRLEN] = { 194, 178, 83 };
 
-	wdt_init();
+	//wdt_stop();
 	uart_init();
 	radio_init(rxaddr);
 	radio_print_config();
 
+	sei();
+	radio_listen();
+
+	_delay_ms(2000);
+	radio_sendto(txaddr, "SYN", 3);
+
 	for (;;) {
-		radio_sendto(txaddr, s, slen);
-		wdt_reset();
+		if (rxdr) {
+			n = radio_recv(buf, MAXPDLEN);
+			buf[n] = '\0';
+			rxdr = 0;
+			if (strncmp(buf, "ACK", 3) == 0) {
+				uart_write("INFO: ");
+				uart_write_line(buf);
+			}
+		} else {
+			uart_write_line("No IRQ");
+		}
+
 		_delay_ms(2000);
+		radio_sendto(txaddr, "SYN", 3);
 	}
 
 	return 0;
 }
+
+ISR(RX_PCINTVEC)
+{
+	rxdr = 1;
+}
-- 
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