From 52784bf5951b6b76cf2c3125a7b78bcfef0553c3 Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <pfalcon@users.sourceforge.net>
Date: Tue, 4 Oct 2016 21:20:47 +0300
Subject: [PATCH] esp8266/modmachine: idle(): Return number of CPU cycles spent
 idling.

Useful to better understand esp8266 inner workings and compare behavior
in different cases.
---
 esp8266/modmachine.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/esp8266/modmachine.c b/esp8266/modmachine.c
index 8a81cba53a..0ab3c122b7 100644
--- a/esp8266/modmachine.c
+++ b/esp8266/modmachine.c
@@ -86,8 +86,10 @@ STATIC mp_obj_t machine_unique_id(void) {
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_unique_id_obj, machine_unique_id);
 
 STATIC mp_obj_t machine_idle(void) {
+    uint32_t t = mp_hal_ticks_cpu();
     asm("waiti 0");
-    return mp_const_none;
+    t = mp_hal_ticks_cpu() - t;
+    return MP_OBJ_NEW_SMALL_INT(t);
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);