Fixed IAR embedded workbench atmega168 project by allocating more CSTACK space. Simplified the iar/gcc compatibility.

bacnet-stack/ports/atmega168/main.c

@@ -138,6 +138,63 @@ static void input_switch_read(
     }
 }
 
+/* stack checking */
+#if STACK_CHECK_ENABLED
+#if defined(__GNUC__)
+extern uint8_t _end;
+extern uint8_t __stack;
+#define STACK_CANARY (0xC5)
+void StackPaint(void) __attribute__ ((naked)) __attribute__ ((section (".init1")));
+
+void StackPaint(void)
+{
+#if 0
+    uint8_t *p = &_end;
+
+    while(p <= &__stack)
+    {
+        *p = STACK_CANARY;
+        p++;
+    }
+#else
+    __asm volatile ("    ldi r30,lo8(_end)\n"
+                    "    ldi r31,hi8(_end)\n"
+                    "    ldi r24,lo8(0xc5)\n" /* STACK_CANARY = 0xc5 */
+                    "    ldi r25,hi8(__stack)\n"
+                    "    rjmp .cmp\n"
+                    ".loop:\n"
+                    "    st Z+,r24\n"
+                    ".cmp:\n"
+                    "    cpi r30,lo8(__stack)\n"
+                    "    cpc r31,r25\n"
+                    "    brlo .loop\n"
+                    "    breq .loop"::);
+#endif
+}
+
+static uint16_t StackCount(void)
+{
+    const uint8_t *p = &_end;
+    uint16_t       c = 0;
+
+    while(*p == STACK_CANARY && p <= &__stack)
+    {
+        p++;
+        c++;
+    }
+
+    return c;
+}
+
+static void Analog_Value_Task(void)
+{
+    extern float AV_Present_Value[MAX_ANALOG_VALUES];
+    
+    AV_Present_Value[0] = (float)StackCount();
+}
+#endif
+#endif
+
 static uint8_t PDUBuffer[MAX_MPDU];
 int main(
     void)
@@ -159,6 +216,9 @@ int main(
         /* BACnet handling */
         pdu_len = datalink_receive(&src, &PDUBuffer[0], sizeof(PDUBuffer), 0);
         if (pdu_len) {
+#if STACK_CHECK_ENABLED
+            Analog_Value_Task();
+#endif
             LED_NPDU_ON();
             npdu_handler(&src, &PDUBuffer[0], pdu_len);
             LED_NPDU_OFF();