From 2e6b83de5ee42b708e2bb4de81bca0e9bcc5f91e Mon Sep 17 00:00:00 2001
From: David Lamparter <equinox@diac24.net>
Date: Sun, 10 Mar 2013 04:43:22 +0100
Subject: debug: trace current instruction pointer

---
 can.c       | 1 +
 lightctrl.c | 5 +++++
 tick.c      | 1 +
 3 files changed, 7 insertions(+)

diff --git a/can.c b/can.c
index 370cfd6..739ae68 100644
--- a/can.c
+++ b/can.c
@@ -203,6 +203,7 @@ ISR(INT0_vect)
 #ifdef HAVE_TICK
 	uart_puttick();
 #endif
+//	dbg_dump_ret();
 	uart_puts("can: irqh<");
 
 	spi_ss(0);
diff --git a/lightctrl.c b/lightctrl.c
index bc5e67e..66f726a 100644
--- a/lightctrl.c
+++ b/lightctrl.c
@@ -1,3 +1,8 @@
+#define _dbg_dump_ret()
+#define dbg_dump_ret() do { \
+		union { uint16_t u; void *p; } ret = { .p = __builtin_return_address(0) }; \
+		_uart_putch('#'); uart_puthex16((ret.u & 0xfff) << 1); _uart_putch('\n'); } while (0)
+
 #define F_CPU 8000000
 #include <stdint.h>
 #include <stdbool.h>
diff --git a/tick.c b/tick.c
index 76ebcc0..a99b303 100644
--- a/tick.c
+++ b/tick.c
@@ -8,6 +8,7 @@ static union {
 ISR(TIMER1_COMPA_vect)
 {
 	systick.u32++;
+//	dbg_dump_ret();
 }
 
 static void uart_puttick(void)
-- 
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