micropython
diff --git a/‎examples/natmod/esp-idf/Makefile
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diff --git a/‎examples/natmod/esp-idf/counter.c
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+# Location of top-level MicroPython directory
+MPY_DIR = ../../..
+
+# Espressif ESP-IDF path
+IDF_PATH := /home/src/esp32/esp-idf-micropython
+# Board to get correct ESP-IDF config
+BOARD := GENERIC
+# xtensa toolchain bin dir
+PATH := $(IDF_PATH)/xtensa-esp32-elf/bin:$(PATH)
+
+# Name of module
+MOD = counter
+
+# Source files (.c or .py)
+SRC = counter.c
+
+# Architecture to build for (x86, x64, armv7m, xtensa, xtensawin)
+ARCH = xtensawin
+
+# Include to get the rules for compiling and linking the module
+include dyn_esp32.mk
+include $(MPY_DIR)/py/dynruntime.mk
+
+#plat_stubs.c: $(MPY_DIR)/ports/esp32/plat_relo.py
+#	$(ECHO) "GEN $@"
+#	$(Q)mkdir -p build
+#	$(Q)$< -c >$@
+
+build/plat_stubs.s: $(MPY_DIR)/ports/esp32/plat_relo.py
+	$(ECHO) "GEN $@"
+	$(Q)mkdir -p build
+	$(Q)$< >$@
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+/* This example demonstrates using an ESP32 esp-idf function
+*/
+
+// Include the header file to get access to the MicroPython API
+#include "py/dynruntime.h"
+
+// ESP-IDF imports
+#include <driver/pcnt.h>
+#include <esp_err.h>
+
+// This is the function which will be called from Python as counter_init(x)
+STATIC mp_obj_t counter_init(mp_obj_t x_obj) {
+    // Extract the integer from the MicroPython input object
+    mp_int_t x = mp_obj_get_int(x_obj);
+    // Call pcnt_unit_config
+    pcnt_config_t cfg = {
+        .unit = 0,
+        .channel = 0,
+        .pulse_gpio_num = x,
+        .ctrl_gpio_num = -1, // not yet supported
+        .counter_h_lim = 0,
+        .counter_l_lim = 0,
+        .pos_mode = PCNT_COUNT_DIS, // positive edge is no-op
+        .neg_mode = PCNT_COUNT_DIS, // negative edge is no-op
+        .lctrl_mode = PCNT_MODE_KEEP, // ctrl pin is no-op
+        .hctrl_mode = PCNT_MODE_KEEP, // ctrl pin is no-op
+    };
+    esp_err_t err = pcnt_unit_config(&cfg);
+    // Convert the result to a MicroPython integer object and return it
+    return mp_obj_new_int(err);
+}
+// Define a Python reference to the function above
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(counter_init_obj, counter_init);
+
+STATIC mp_obj_t mem_info() {
+    extern int mp_micropython_mem_info(int, int);
+    mp_printf(&mp_plat_print, "mp_fun_table is at 0x%x\n", &mp_fun_table);
+    mp_printf(&mp_plat_print, "plat_relo_tab is at 0x%x\n", mp_fun_table.plat_relo_tab);
+    mp_printf(&mp_plat_print, "calling mp_micropython_mem_info\n");
+    int i = mp_micropython_mem_info(0, 0);
+    mp_printf(&mp_plat_print, "mp_micropython_mem_info: %d/0x%x\n", i, i);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_0(mem_info_obj, mem_info);
+
+// This is the entry point and is called when the module is imported
+mp_obj_t mpy_init(mp_obj_fun_bc_t *self, size_t n_args, size_t n_kw, mp_obj_t *args) {
+    // This must be first, it sets up the globals dict and other things
+    MP_DYNRUNTIME_INIT_ENTRY
+
+    // Make the function available in the module's namespace
+    mp_store_global(MP_QSTR_counter_init, MP_OBJ_FROM_PTR(&counter_init_obj));
+    mp_store_global(MP_QSTR_mem_info, MP_OBJ_FROM_PTR(&mem_info_obj));
+
+    // This must be last, it restores the globals dict
+    MP_DYNRUNTIME_INIT_EXIT
+}