From 9a63e8c027ba6912f2a2eb093c71b3e29b5d5269 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Philippe=20R=C3=A9tornaz?= <philippe.retornaz@epfl.ch>
Date: Thu, 23 Aug 2012 16:16:04 +0200
Subject: [PATCH] cc253x: Add stack monitoring helpers

---
 cpu/cc253x/soc.c | 30 ++++++++++++++++++++++++++++++
 cpu/cc253x/soc.h |  3 +++
 2 files changed, 33 insertions(+)

diff --git a/cpu/cc253x/soc.c b/cpu/cc253x/soc.c
index 36d9531e4..94b3935e8 100644
--- a/cpu/cc253x/soc.c
+++ b/cpu/cc253x/soc.c
@@ -52,3 +52,33 @@ soc_init()
   ENABLE_INTERRUPTS();
 }
 
+#ifndef STACK_POISON
+#define STACK_POISON 0xAA
+#endif
+
+void 
+cc253x_stack_poison(void) 
+{
+  __asm
+  mov r1, _SP
+poison_loop:
+  inc r1
+  mov @r1, #STACK_POISON
+  cjne r1, #0xFF, poison_loop
+  __endasm;
+}
+
+uint8_t
+cc253x_get_max_stack(void)
+{
+  __data uint8_t * sp = (__data uint8_t *) 0xff;
+  uint8_t free = 0;
+
+  while(*sp-- == STACK_POISON) {
+    free++;
+  }
+
+  return 0xff - free;
+}
+
+
diff --git a/cpu/cc253x/soc.h b/cpu/cc253x/soc.h
index bcf858ba0..e4d4c855c 100644
--- a/cpu/cc253x/soc.h
+++ b/cpu/cc253x/soc.h
@@ -61,4 +61,7 @@
 
 void soc_init();
 
+void cc253x_stack_poison(void);
+uint8_t cc253x_get_max_stack(void);
+
 #endif /* __SOC_H__ */