8000 proof of concept for esp32 stubs to call platform-dependent functions · micropython/micropython@df20420 · GitHub
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proof of concept for esp32 stubs to call platform-dependent functions
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‎examples/natmod/esp-idf/Makefile

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# Location of top-level MicroPython directory
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MPY_DIR = ../../..
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# Espressif ESP-IDF path
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IDF_PATH := /home/src/esp32/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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# Name of module
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MOD = counter
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# Source files (.c or .py)
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SRC = counter.c
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# Architecture to build for (x86, x64, armv7m, xtensa, xtensawin)
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ARCH = xtensawin
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# Include to get the rules for compiling and linking the module
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include dyn_esp32.mk
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include $(MPY_DIR)/py/dynruntime.mk
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#plat_stubs.c: $(MPY_DIR)/ports/esp32/plat_relo.py
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# $(ECHO) "GEN $@"
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# $(Q)mkdir -p build
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# $(Q)$< -c >$@
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build/plat_stubs.s: $(MPY_DIR)/ports/esp32/plat_relo.py
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$(ECHO) "GEN $@"
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$(Q)mkdir -p build
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$(Q)$< >$@

‎examples/natmod/esp-idf/counter.c

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/* This example demonstrates using an ESP32 esp-idf function
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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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// ESP-IDF imports
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#include <driver/pcnt.h>
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#include <esp_err.h>
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// This is the function which will be called from Python as counter_init(x)
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STATIC mp_obj_t counter_init(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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// Call pcnt_unit_config
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pcnt_config_t cfg = {
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.unit = 0,
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.channel = 0,
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.pulse_gpio_num = x,
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.ctrl_gpio_num = -1, // not yet supported
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.counter_h_lim = 0,
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.counter_l_lim = 0,
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.pos_mode = PCNT_COUNT_DIS, // positive edge is no-op
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.neg_mode = PCNT_COUNT_DIS, // negative edge is no-op
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.lctrl_mode = PCNT_MODE_KEEP, // ctrl pin is no-op
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.hctrl_mode = PCNT_MODE_KEEP, // ctrl pin is no-op
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};
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esp_err_t err = pcnt_unit_config(&cfg);
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// Convert the result to a MicroPython integer object and return it
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return mp_obj_new_int(err);
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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(counter_init_obj, counter_init);
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STATIC mp_obj_t mem_info() {
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extern int mp_micropython_mem_info(int, int);
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mp_printf(&mp_plat_print, "mp_fun_table is at 0x%x\n", &mp_fun_table);
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mp_printf(&mp_plat_print, "plat_relo_tab is at 0x%x\n", mp_fun_table.plat_relo_tab);
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mp_printf(&mp_plat_print, "calling mp_micropython_mem_info\n");
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int i = mp_micropython_mem_info(0, 0);
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mp_printf(&mp_plat_print, "mp_micropython_mem_info: %d/0x%x\n", i, i);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_0(mem_info_obj, mem_info);
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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_counter_init, MP_OBJ_FROM_PTR(&counter_init_obj));
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mp_store_global(MP_QSTR_mem_info, MP_OBJ_FROM_PTR(&mem_info_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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}

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