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esp32: add dynamic linking of mp_port_fun_table
esp32: add auto-generation of mp_port_fun_table from esp-idf docs esp32: add makefiles to compile native modules with esp-idf includes esp32: add esp32heap example
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‎examples/natmod/esp32-heap/Makefile

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# Location of top-level MicroPython directory
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MPY_DIR = $(abspath ../../..)
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# Name of module
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MOD = esp32heap
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# Source files (.c or .py)
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SRC = features0.c
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# Architecture to build for (x86, x64, armv7m, xtensa, xtensawin)
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ARCH = xtensawin
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PORT = esp32
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# Espressif ESP-IDF path
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IDF_PATH := $(abspath ../../../../esp-idf-micropython)
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# Board to get correct ESP-IDF config
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BOARD := GENERIC
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# xtensa toolchain bin dir
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PATH := $(IDF_PATH)/xtensa-esp32-elf/bin:$(PATH)
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# Include to get the rules for compiling and linking the module
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include $(MPY_DIR)/py/dynruntime.mk
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include $(MPY_DIR)/ports/$(PORT)/dynruntime.mk

‎examples/natmod/esp32-heap/features0.c

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/* This example demonstrates the following features in a native module:
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- defining a simple function exposed to Python
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- defining a local, helper C function
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- getting and creating integer objects
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*/
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// Include the header file to get access to the MicroPython API
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#include "py/dynruntime.h"
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// Include esp-idf include files
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#include "esp_system.h"
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// This is the function which will be called from Python, as factorial(x)
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STATIC mp_obj_t free_heap(mp_obj_t x_obj) {
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// // Extract the integer from the MicroPython input object
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// mp_int_t x = mp_obj_get_int(x_obj);
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// // Calculate the factorial
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// mp_int_t result = factorial_helper(x);
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// // Convert the result to a MicroPython integer object and return it
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// return mp_obj_new_int(result);
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return mp_obj_new_int(esp_get_free_heap_size());
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}
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// Define a Python reference to the function above
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(free_heap_obj, free_heap);
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// This is the entry point and is called when the module is imported
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mp_obj_t mpy_init(mp_obj_fun_bc_t *self, size_t n_args, size_t n_kw, mp_obj_t *args) {
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// This must be first, it sets up the globals dict and other things
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MP_DYNRUNTIME_INIT_ENTRY
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// Make the function available in the module's namespace
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mp_store_global(MP_QSTR_free_heap, MP_OBJ_FROM_PTR(&free_heap_obj));
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// This must be last, it restores the globals dict
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MP_DYNRUNTIME_INIT_EXIT
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}

‎examples/natmod/features0/Makefile

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SRC = features0.c
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# Architecture to build for (x86, x64, armv7m, xtensa, xtensawin)
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ARCH = xtensawin
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PORT = esp32
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ARCH = x64
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# Include to get the rules for compiling and linking the module
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include $(MPY_DIR)/py/dynruntime.mk

‎examples/natmod/features0/features0.c

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// Include the header file to get access to the MicroPython API
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#include "py/dynruntime.h"
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// // Helper function to compute factorial
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// STATIC mp_int_t factorial_helper(mp_int_t x) {
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// if (x == 0) {
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// return 1;
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// }
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// return x * factorial_helper(x - 1);
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// }
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// Helper function to compute factorial
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STATIC mp_int_t factorial_helper(mp_int_t x) {
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if (x == 0) {
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return 1;
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}
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return x * factorial_helper(x - 1);
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}
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// This is the function which will be called from Python, as factorial(x)
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STATIC mp_obj_t factorial(mp_obj_t x_obj) {
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// // Extract the integer from the MicroPython input object
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// mp_int_t x = mp_obj_get_int(x_obj);
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// // Calculate the factorial
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// mp_int_t result = factorial_helper(x);
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// // Convert the result to a MicroPython integer object and return it
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// return mp_obj_new_int(result);
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return mp_obj_new_int(mp_port_fun_table.esp_clk_cpu_freq());
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// Extract the integer from the MicroPython input object
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mp_int_t x = mp_obj_get_int(x_obj);
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// Calculate the factorial
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mp_int_t result = factorial_helper(x);
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// Convert the result to a MicroPython integer object and return it
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return mp_obj_new_int(result);
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}
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// Define a Python reference to the function above
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(factorial_obj, factorial);

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