diff -u ./a/Esp.cpp ./b/Esp.cpp
--- ./a/Esp.cpp 2017-07-13 11:06:22.838445721 +0200
+++ ./b/Esp.cpp 2017-07-13 11:05:44.446255344 +0200
@@ -107,13 +107,18 @@

 extern "C" void esp_yield();

-void EspClass::deepSleep(uint32_t time_us, WakeMode mode)
+void EspClass::deepSleep(uint64_t time_us, WakeMode mode)
 {
     system_deep_sleep_set_option(static_cast<int>(mode));
     system_deep_sleep(time_us);
     esp_yield();
 }

+uint32 EspClass::cali_proc(void)
+{
+    return system_rtc_clock_cali_proc();
+}
+
 bool EspClass::rtcUserMemoryRead(uint32_t offset, uint32_t *data, size_t size)
 {
     if (size + offset > 512) {
diff -u ./a/Esp.h ./b/Esp.h
--- ./a/Esp.h   2017-07-13 11:06:41.334537438 +0200
+++ ./b/Esp.h   2017-07-13 11:13:18.320505985 +0200
@@ -92,7 +92,8 @@
         void wdtDisable();
         void wdtFeed();

-        void deepSleep(uint32_t time_us, RFMode mode = RF_DEFAULT);
+        void deepSleep(uint64_t time_us, RFMode mode = RF_DEFAULT);
+        uint32_t cali_proc();

         bool rtcUserMemoryRead(uint32_t offset, uint32_t *data, size_t size);
         bool rtcUserMemoryWrite(uint32_t offset, uint32_t *data, size_t size);