508 lines
19 KiB
C
508 lines
19 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2017-2020 Nick Moore
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* Copyright (c) 2018 shawwwn <shawwwn1@gmail.com>
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* Copyright (c) 2020-2021 Glenn Moloney @glenn20
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include "py/runtime.h"
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#if MICROPY_PY_ESPNOW
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#include "c_types.h"
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#include "espnow.h"
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#include "py/mphal.h"
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#include "py/mperrno.h"
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#include "py/qstr.h"
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#include "py/objstr.h"
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#include "py/objarray.h"
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#include "py/stream.h"
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#include "py/binary.h"
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#include "py/ringbuf.h"
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#include "mpconfigport.h"
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#include "modespnow.h"
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// For the esp8266
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#define ESP_NOW_MAX_DATA_LEN (250)
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#define ESP_NOW_KEY_LEN (16)
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#define ESP_NOW_ETH_ALEN (6)
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#define ESP_NOW_SEND_SUCCESS (0)
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#define ESP_ERR_ESPNOW_NO_MEM (-77777)
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#define ESP_OK (0)
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#define ESP_NOW_MAX_TOTAL_PEER_NUM (20)
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#define ESP_NOW_MAX_ENCRYPT_PEER_NUM (6)
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#define ESP_ERR_ESPNOW_NOT_INIT (0x300 + 100 + 1)
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typedef int esp_err_t;
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static const uint8_t ESPNOW_MAGIC = 0x99;
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// Use this for peeking at the header of the next packet in the buffer.
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typedef struct {
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uint8_t magic; // = ESPNOW_MAGIC
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uint8_t msg_len; // Length of the message
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} __attribute__((packed)) espnow_hdr_t;
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// ESPNow packet format for the receive buffer.
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typedef struct {
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espnow_hdr_t hdr; // The header
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uint8_t peer[6]; // Peer address
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uint8_t msg[0]; // Message is up to 250 bytes
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} __attribute__((packed)) espnow_pkt_t;
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// The maximum length of an espnow packet (bytes)
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static const size_t MAX_PACKET_LEN = (
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sizeof(espnow_pkt_t) + ESP_NOW_MAX_DATA_LEN);
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// Enough for 2 full-size packets: 2 * (6 + 2 + 250) = 516 bytes
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// Will allocate an additional 7 bytes for buffer overhead
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#define DEFAULT_RECV_BUFFER_SIZE \
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(2 * (sizeof(espnow_pkt_t) + ESP_NOW_MAX_DATA_LEN))
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// Default timeout (millisec) to wait for incoming ESPNow messages (5 minutes).
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#define DEFAULT_RECV_TIMEOUT_MS (5 * 60 * 1000)
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// Number of milliseconds to wait for pending responses to sent packets.
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// This is a fallback which should never be reached.
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#define PENDING_RESPONSES_TIMEOUT_MS 100
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// The data structure for the espnow_singleton.
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typedef struct _esp_espnow_obj_t {
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mp_obj_base_t base;
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ringbuf_t *recv_buffer; // A buffer for received packets
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size_t recv_buffer_size; // Size of recv buffer
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size_t recv_timeout_ms; // Timeout for irecv()
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size_t tx_packets; // Count of sent packets
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volatile size_t tx_responses; // # of sent packet responses received
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volatile size_t tx_failures; // # of sent packet responses failed
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} esp_espnow_obj_t;
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// Initialised below.
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const mp_obj_type_t esp_espnow_type;
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static esp_espnow_obj_t espnow_singleton = {
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.base.type = &esp_espnow_type,
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.recv_buffer = NULL,
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.recv_buffer_size = DEFAULT_RECV_BUFFER_SIZE,
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.recv_timeout_ms = DEFAULT_RECV_TIMEOUT_MS,
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};
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// ### Initialisation and Config functions
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//
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static void check_esp_err(int e) {
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if (e != 0) {
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mp_raise_OSError(e);
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}
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}
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// Return a pointer to the ESPNow module singleton
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// If state == INITIALISED check the device has been initialised.
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// Raises OSError if not initialised and state == INITIALISED.
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static esp_espnow_obj_t *_get_singleton() {
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return &espnow_singleton;
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}
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static esp_espnow_obj_t *_get_singleton_initialised() {
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esp_espnow_obj_t *self = _get_singleton();
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if (self->recv_buffer == NULL) {
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// Throw an espnow not initialised error
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check_esp_err(ESP_ERR_ESPNOW_NOT_INIT);
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}
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return self;
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}
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// Allocate and initialise the ESPNow module as a singleton.
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// Returns the initialised espnow_singleton.
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STATIC mp_obj_t espnow_make_new(const mp_obj_type_t *type, size_t n_args,
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size_t n_kw, const mp_obj_t *all_args) {
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return _get_singleton();
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}
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// Forward declare the send and recv ESPNow callbacks
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STATIC void send_cb(uint8_t *mac_addr, uint8_t status);
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STATIC void recv_cb(uint8_t *mac_addr, uint8_t *data, uint8_t len);
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// ESPNow.deinit(): De-initialise the ESPNOW software stack, disable callbacks
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// and deallocate the recv data buffers.
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// Note: this function is called from main.c:mp_task() to cleanup before soft
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// reset, so cannot be declared STATIC and must guard against self == NULL;.
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mp_obj_t espnow_deinit(mp_obj_t _) {
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esp_espnow_obj_t *self = _get_singleton();
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if (self->recv_buffer != NULL) {
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// esp_now_unregister_recv_cb();
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esp_now_deinit();
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self->recv_buffer->buf = NULL;
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self->recv_buffer = NULL;
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self->tx_packets = self->tx_responses;
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}
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MP_STATE_PORT(espnow_buffer) = NULL;
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return mp_const_none;
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}
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// ESPNow.active(): Initialise the data buffers and ESP-NOW functions.
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// Initialise the Espressif ESPNOW software stack, register callbacks and
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// allocate the recv data buffers.
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// Returns True if interface is active, else False.
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STATIC mp_obj_t espnow_active(size_t n_args, const mp_obj_t *args) {
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esp_espnow_obj_t *self = args[0];
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if (n_args > 1) {
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if (mp_obj_is_true(args[1])) {
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if (self->recv_buffer == NULL) { // Already initialised
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self->recv_buffer = m_new_obj(ringbuf_t);
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ringbuf_alloc(self->recv_buffer, self->recv_buffer_size);
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MP_STATE_PORT(espnow_buffer) = self->recv_buffer;
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esp_now_init();
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esp_now_set_self_role(ESP_NOW_ROLE_COMBO);
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esp_now_register_recv_cb(recv_cb);
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esp_now_register_send_cb(send_cb);
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}
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} else {
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espnow_deinit(self);
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}
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}
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return mp_obj_new_bool(self->recv_buffer != NULL);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(espnow_active_obj, 1, 2, espnow_active);
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// ESPNow.config(): Initialise the data buffers and ESP-NOW functions.
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// Initialise the Espressif ESPNOW software stack, register callbacks and
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// allocate the recv data buffers.
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// Returns True if interface is active, else False.
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STATIC mp_obj_t espnow_config(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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esp_espnow_obj_t *self = _get_singleton();
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enum { ARG_rxbuf, ARG_timeout_ms };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_rxbuf, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
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{ MP_QSTR_timeout_ms, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args,
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MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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if (args[ARG_rxbuf].u_int >= 0) {
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self->recv_buffer_size = args[ARG_rxbuf].u_int;
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}
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if (args[ARG_timeout_ms].u_int >= 0) {
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self->recv_timeout_ms = args[ARG_timeout_ms].u_int;
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}
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(espnow_config_obj, 1, espnow_config);
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// ### The ESP_Now send and recv callback routines
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//
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// Callback triggered when a sent packet is acknowledged by the peer (or not).
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// Just count the number of responses and number of failures.
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// These are used in the send()/write() logic.
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STATIC void send_cb(uint8_t *mac_addr, uint8_t status) {
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esp_espnow_obj_t *self = _get_singleton();
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self->tx_responses++;
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if (status != ESP_NOW_SEND_SUCCESS) {
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self->tx_failures++;
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}
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}
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// Callback triggered when an ESP-Now packet is received.
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// Write the peer MAC address and the message into the recv_buffer as an
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// ESPNow packet.
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// If the buffer is full, drop the message and increment the dropped count.
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// Schedules the user callback if one has been registered (ESPNow.config()).
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STATIC void recv_cb(uint8_t *mac_addr, uint8_t *msg, uint8_t msg_len) {
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esp_espnow_obj_t *self = _get_singleton();
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ringbuf_t *buf = self->recv_buffer;
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// TODO: Test this works with ">".
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if (buf == NULL || sizeof(espnow_pkt_t) + msg_len >= ringbuf_free(buf)) {
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return;
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}
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espnow_hdr_t header;
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header.magic = ESPNOW_MAGIC;
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header.msg_len = msg_len;
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ringbuf_put_bytes(buf, (uint8_t *)&header, sizeof(header));
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ringbuf_put_bytes(buf, mac_addr, ESP_NOW_ETH_ALEN);
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ringbuf_put_bytes(buf, msg, msg_len);
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}
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// Return C pointer to byte memory string/bytes/bytearray in obj.
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// Raise ValueError if the length does not match expected len.
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static uint8_t *_get_bytes_len_rw(mp_obj_t obj, size_t len, mp_uint_t rw) {
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(obj, &bufinfo, rw);
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if (bufinfo.len != len) {
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mp_raise_ValueError(MP_ERROR_TEXT("invalid buffer length"));
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}
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return (uint8_t *)bufinfo.buf;
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}
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static uint8_t *_get_bytes_len(mp_obj_t obj, size_t len) {
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return _get_bytes_len_rw(obj, len, MP_BUFFER_READ);
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}
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static uint8_t *_get_bytes_len_w(mp_obj_t obj, size_t len) {
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return _get_bytes_len_rw(obj, len, MP_BUFFER_WRITE);
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}
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// ### Handling espnow packets in the recv buffer
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//
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// Copy data from the ring buffer - wait if buffer is empty up to timeout_ms
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// 0: Success
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// -1: Not enough data available to complete read (try again later)
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// -2: Requested read is larger than buffer - will never succeed
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static int ringbuf_get_bytes_wait(ringbuf_t *r, uint8_t *data, size_t len, mp_int_t timeout_ms) {
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mp_uint_t start = mp_hal_ticks_ms();
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int status = 0;
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while (((status = ringbuf_get_bytes(r, data, len)) == -1)
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&& (timeout_ms < 0 || (mp_uint_t)(mp_hal_ticks_ms() - start) < (mp_uint_t)timeout_ms)) {
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mp_event_wait_ms(1);
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}
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return status;
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}
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// ESPNow.recvinto([timeout_ms, []]):
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// Returns a list of byte strings: (peer_addr, message) where peer_addr is
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// the MAC address of the sending peer.
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// Arguments:
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// timeout_ms: timeout in milliseconds (or None).
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// buffers: list of bytearrays to store values: [peer, message].
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// Default timeout is set with ESPNow.config(timeout=milliseconds).
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// Return (None, None) on timeout.
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STATIC mp_obj_t espnow_recvinto(size_t n_args, const mp_obj_t *args) {
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esp_espnow_obj_t *self = _get_singleton_initialised();
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size_t timeout_ms = ((n_args > 2 && args[2] != mp_const_none)
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? mp_obj_get_int(args[2]) : self->recv_timeout_ms);
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mp_obj_list_t *list = MP_OBJ_TO_PTR(args[1]);
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if (!mp_obj_is_type(list, &mp_type_list) || list->len < 2) {
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mp_raise_ValueError(MP_ERROR_TEXT("ESPNow.recvinto(): Invalid argument"));
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}
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mp_obj_array_t *msg = MP_OBJ_TO_PTR(list->items[1]);
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size_t msg_size = msg->len + msg->free;
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if (mp_obj_is_type(msg, &mp_type_bytearray)) {
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msg->len = msg_size; // Make all the space in msg array available
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msg->free = 0;
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}
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uint8_t *peer_buf = _get_bytes_len_w(list->items[0], ESP_NOW_ETH_ALEN);
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uint8_t *msg_buf = _get_bytes_len_w(msg, ESP_NOW_MAX_DATA_LEN);
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// Read the packet header from the incoming buffer
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espnow_hdr_t hdr;
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if (ringbuf_get_bytes_wait(self->recv_buffer, (uint8_t *)&hdr, sizeof(hdr), timeout_ms) < 0) {
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return MP_OBJ_NEW_SMALL_INT(0); // Timeout waiting for packet
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}
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int msg_len = hdr.msg_len;
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// Check the message packet header format and read the message data
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if (hdr.magic != ESPNOW_MAGIC
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|| msg_len > ESP_NOW_MAX_DATA_LEN
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|| ringbuf_get_bytes(self->recv_buffer, peer_buf, ESP_NOW_ETH_ALEN) < 0
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|| ringbuf_get_bytes(self->recv_buffer, msg_buf, msg_len) < 0) {
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mp_raise_ValueError(MP_ERROR_TEXT("ESPNow.recv(): buffer error"));
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}
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if (mp_obj_is_type(msg, &mp_type_bytearray)) {
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// Set the length of the message bytearray.
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msg->len = msg_len;
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msg->free = msg_size - msg_len;
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}
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return MP_OBJ_NEW_SMALL_INT(msg_len);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(espnow_recvinto_obj, 2, 3, espnow_recvinto);
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// Used by espnow_send() for sends() with sync==True.
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// Wait till all pending sent packet responses have been received.
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// ie. self->tx_responses == self->tx_packets.
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// Return the number of responses where status != ESP_NOW_SEND_SUCCESS.
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static void _wait_for_pending_responses(esp_espnow_obj_t *self) {
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for (int i = 0; i < PENDING_RESPONSES_TIMEOUT_MS; i++) {
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if (self->tx_responses >= self->tx_packets) {
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return;
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}
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mp_hal_delay_ms(1); // Allow other tasks to run
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}
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// Note: the loop timeout is just a fallback - in normal operation
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// we should never reach that timeout.
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}
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// ESPNow.send(peer_addr, message, [sync (=true)])
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// ESPNow.send(message)
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// Send a message to the peer's mac address. Optionally wait for a response.
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// If sync == True, wait for response after sending.
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// Returns:
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// True if sync==False and message sent successfully.
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// True if sync==True and message is received successfully by all recipients
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// False if sync==True and message is not received by at least one recipient
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// Raises: EAGAIN if the internal espnow buffers are full.
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STATIC mp_obj_t espnow_send(size_t n_args, const mp_obj_t *args) {
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esp_espnow_obj_t *self = _get_singleton_initialised();
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bool sync = n_args <= 3 || args[3] == mp_const_none || mp_obj_is_true(args[3]);
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// Get a pointer to the buffer of obj
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mp_buffer_info_t message;
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mp_get_buffer_raise(args[2], &message, MP_BUFFER_READ);
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// Bugfix: esp_now_send() generates a panic if message buffer points
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// to an address in ROM (eg. a statically interned QSTR).
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// Fix: if message is not in gc pool, copy to a temp buffer.
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static char temp[ESP_NOW_MAX_DATA_LEN]; // Static to save code space
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byte *p = (byte *)message.buf;
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// if (p < MP_STATE_MEM(area.gc_pool_start) || MP_STATE_MEM(area.gc_pool_end) < p) {
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if (MP_STATE_MEM(area.gc_pool_end) < p) {
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// If buffer is not in GC pool copy from ROM to stack
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memcpy(temp, message.buf, message.len);
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message.buf = temp;
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}
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if (sync) {
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// If the last call was sync==False there may be outstanding responses.
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// We need to wait for all pending responses if this call has sync=True.
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_wait_for_pending_responses(self);
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}
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int saved_failures = self->tx_failures;
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check_esp_err(
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esp_now_send(_get_bytes_len(args[1], ESP_NOW_ETH_ALEN), message.buf, message.len));
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self->tx_packets++;
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if (sync) {
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// Wait for message to be received by peer
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_wait_for_pending_responses(self);
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}
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// Return False if sync and any peers did not respond.
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return mp_obj_new_bool(!(sync && self->tx_failures != saved_failures));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(espnow_send_obj, 3, 4, espnow_send);
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// ### Peer Management Functions
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//
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// Set the ESP-NOW Primary Master Key (pmk) (for encrypted communications).
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// Raise OSError if not initialised.
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// Raise ValueError if key is not a bytes-like object exactly 16 bytes long.
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STATIC mp_obj_t espnow_set_pmk(mp_obj_t _, mp_obj_t key) {
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check_esp_err(esp_now_set_kok(_get_bytes_len(key, ESP_NOW_KEY_LEN), ESP_NOW_KEY_LEN));
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(espnow_set_pmk_obj, espnow_set_pmk);
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// ESPNow.add_peer(peer_mac, [lmk, [channel, [ifidx, [encrypt]]]])
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// Positional args set to None will be left at defaults.
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// Raise OSError if not initialised.
|
|
// Raise ValueError if mac or LMK are not bytes-like objects or wrong length.
|
|
// Raise TypeError if invalid keyword args or too many positional args.
|
|
// Return None.
|
|
STATIC mp_obj_t espnow_add_peer(size_t n_args, const mp_obj_t *args) {
|
|
check_esp_err(
|
|
esp_now_add_peer(
|
|
_get_bytes_len(args[1], ESP_NOW_ETH_ALEN),
|
|
ESP_NOW_ROLE_COMBO,
|
|
(n_args > 3) ? mp_obj_get_int(args[3]) : 0,
|
|
(n_args > 2) ? _get_bytes_len(args[2], ESP_NOW_KEY_LEN) : NULL,
|
|
ESP_NOW_KEY_LEN));
|
|
|
|
return mp_const_none;
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(espnow_add_peer_obj, 2, 4, espnow_add_peer);
|
|
|
|
// ESPNow.del_peer(peer_mac): Unregister peer_mac.
|
|
// Raise OSError if not initialised.
|
|
// Raise ValueError if peer is not a bytes-like objects or wrong length.
|
|
// Return None.
|
|
STATIC mp_obj_t espnow_del_peer(mp_obj_t _, mp_obj_t peer) {
|
|
esp_now_del_peer(_get_bytes_len(peer, ESP_NOW_ETH_ALEN));
|
|
return mp_const_none;
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_2(espnow_del_peer_obj, espnow_del_peer);
|
|
|
|
STATIC const mp_rom_map_elem_t esp_espnow_locals_dict_table[] = {
|
|
{ MP_ROM_QSTR(MP_QSTR_active), MP_ROM_PTR(&espnow_active_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_config), MP_ROM_PTR(&espnow_config_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_recvinto), MP_ROM_PTR(&espnow_recvinto_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_send), MP_ROM_PTR(&espnow_send_obj) },
|
|
|
|
// Peer management functions
|
|
{ MP_ROM_QSTR(MP_QSTR_set_pmk), MP_ROM_PTR(&espnow_set_pmk_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_add_peer), MP_ROM_PTR(&espnow_add_peer_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_del_peer), MP_ROM_PTR(&espnow_del_peer_obj) },
|
|
};
|
|
STATIC MP_DEFINE_CONST_DICT(esp_espnow_locals_dict, esp_espnow_locals_dict_table);
|
|
|
|
STATIC const mp_rom_map_elem_t espnow_globals_dict_table[] = {
|
|
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR__espnow) },
|
|
{ MP_ROM_QSTR(MP_QSTR_ESPNowBase), MP_ROM_PTR(&esp_espnow_type) },
|
|
{ MP_ROM_QSTR(MP_QSTR_MAX_DATA_LEN), MP_ROM_INT(ESP_NOW_MAX_DATA_LEN)},
|
|
{ MP_ROM_QSTR(MP_QSTR_ADDR_LEN), MP_ROM_INT(ESP_NOW_ETH_ALEN)},
|
|
{ MP_ROM_QSTR(MP_QSTR_KEY_LEN), MP_ROM_INT(ESP_NOW_KEY_LEN)},
|
|
{ MP_ROM_QSTR(MP_QSTR_MAX_TOTAL_PEER_NUM), MP_ROM_INT(ESP_NOW_MAX_TOTAL_PEER_NUM)},
|
|
{ MP_ROM_QSTR(MP_QSTR_MAX_ENCRYPT_PEER_NUM), MP_ROM_INT(ESP_NOW_MAX_ENCRYPT_PEER_NUM)},
|
|
};
|
|
STATIC MP_DEFINE_CONST_DICT(espnow_globals_dict, espnow_globals_dict_table);
|
|
|
|
// ### Dummy Buffer Protocol support
|
|
// ...so asyncio can poll.ipoll() on this device
|
|
|
|
// Support ioctl(MP_STREAM_POLL, ) for asyncio
|
|
STATIC mp_uint_t espnow_stream_ioctl(mp_obj_t self_in, mp_uint_t request,
|
|
uintptr_t arg, int *errcode) {
|
|
if (request != MP_STREAM_POLL) {
|
|
*errcode = MP_EINVAL;
|
|
return MP_STREAM_ERROR;
|
|
}
|
|
esp_espnow_obj_t *self = _get_singleton();
|
|
return (self->recv_buffer == NULL) ? 0 : // If not initialised
|
|
arg ^ ((ringbuf_avail(self->recv_buffer) == 0) ? MP_STREAM_POLL_RD : 0);
|
|
}
|
|
|
|
STATIC const mp_stream_p_t espnow_stream_p = {
|
|
.ioctl = espnow_stream_ioctl,
|
|
};
|
|
|
|
MP_DEFINE_CONST_OBJ_TYPE(
|
|
esp_espnow_type,
|
|
MP_QSTR_ESPNowBase,
|
|
MP_TYPE_FLAG_NONE,
|
|
make_new, espnow_make_new,
|
|
protocol, &espnow_stream_p,
|
|
locals_dict, &esp_espnow_locals_dict
|
|
);
|
|
|
|
const mp_obj_module_t mp_module_espnow = {
|
|
.base = { &mp_type_module },
|
|
.globals = (mp_obj_dict_t *)&espnow_globals_dict,
|
|
};
|
|
|
|
MP_REGISTER_MODULE(MP_QSTR__espnow, mp_module_espnow);
|
|
MP_REGISTER_ROOT_POINTER(void *espnow_buffer);
|
|
#endif
|