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rx.cpp
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rx.cpp
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/*
* This file is part of the opentx-espnow-rx (https://github.com/tmertelj/opentx-espnow-rx).
* Copyright (c) 2019 Tomaz Mertelj.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <assert.h>
#include <Arduino.h>
#include <EEPROM.h>
#if defined(ESP8266)
#include <ESP8266WiFi.h>
//Binding (broadcast) from esp32 seems to work only with non-os-sdk 2.2.2
#elif defined(ESP32)
#include <WiFi.h>
#include <esp_wifi.h>
#define LED_BUILTIN 2
#endif
#include <WifiEspNow.h>
#include "esprx.h"
#include "uCRC16Lib.h"
#include <Ticker.h>
#if defined(ESP8266)
#define ADD_PEER(mac, chan, mode) WifiEspNow.addPeer(mac, chan)
#elif defined(ESP32)
#define ADD_PEER(mac, chan, mode) WifiEspNow.addPeer(mac, chan, NULL, (int)mode)
#endif
static struct WifiEspNowPeerInfo txPeer = {{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},1};
static RXPacket_t packet;
static volatile bool dirty = false;
static volatile bool bindEnabled = true;
static uint32_t startTime;
static bool ppmStarted = false;
uint32_t volatile packRecv = 0;
uint32_t volatile packAckn = 0;
uint32_t volatile recvTime = 0;
Ticker blinker;
char *mac2str(const uint8_t mac[6]) {
static char buff[18];
sprintf(buff, "%02X:%02X:%02X:%02X:%02X:%02X\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
return buff;
}
static bool packet_check(TXPacket_t * rxp)
{
packet.idx++;
uint16_t crc = rxp->crc;
rxp->crc = 0;
packet.crc = uCRC16Lib::calculate((char *) rxp, sizeof(TXPacket_t));
if ( packet.crc == crc) {
packet.idx = rxp->idx;
packet.type = ACK;
return true;
}
Serial.printf("CRC16 error: %d vs %d\n", packet.crc, crc);
return false;
}
static inline void process_data(const uint8_t mac[6], TXPacket_t *rp){
if (packet_check(rp)) {
recvTime = millis();
#if defined(ESP32)
portENTER_CRITICAL(&timerMux);
#endif
memcpy( (void*) locChannelOutputs, rp->ch, sizeof(locChannelOutputs) );
#if defined(ESP32)
portEXIT_CRITICAL(&timerMux);
#endif
packRecv++;
WifiEspNow.send(txPeer.mac, (const uint8_t *) &packet, sizeof(packet)); //Send ACK
// if (FSAFE == rp->type) {
// dirty = true;
// }
if (!ppmStarted && !bindEnabled) {
initPPM();
ppmStarted = true;
}
}
else {
Serial.printf("Packet error from MAC: %s\n", mac2str(mac));
}
}
static inline void process_bind(const uint8_t mac[6], TXPacket_t *rp) {
if (BIND == rp->type) {
uint16_t crc = rp->crc;
rp->crc = 0;
rp->crc = uCRC16Lib::calculate((char *) rp, sizeof(TXPacket_t));
if(crc == rp->crc){
Serial.printf("Got bind MAC: %s", mac2str(mac));
memcpy(txPeer.mac, mac, sizeof(txPeer.mac));
memcpy( (void*) fsChannelOutputs, rp->ch, sizeof(locChannelOutputs) );
txPeer.channel = rp->idx;
if (!ADD_PEER(txPeer.mac, txPeer.channel, ESP_IF_WIFI_STA)) {
Serial.printf("ADD_PEER() failed MAC: %s", mac2str(txPeer.mac));
}
packet.type = BIND;
packet.crc=0;
packet.crc = uCRC16Lib::calculate((char *) &packet, sizeof(packet));
WifiEspNow.send(txPeer.mac, (const uint8_t *) &packet, sizeof(packet));
dirty = true;
bindEnabled = false;
}
else {
Serial.printf("Bind packet CRC error: %d vs %d", crc, rp->crc);
}
}
else {
Serial.printf("Incorrect packet type: %d", rp->type);
}
}
void recv_cb(const uint8_t mac[6], const uint8_t* buf, size_t count, void* cbarg) {
if (sizeof(TXPacket_t) == count) {
TXPacket_t *rp = (TXPacket_t *) buf;
if (bindEnabled && BIND == rp->type) {
process_bind(mac, rp);
}
else if (DATA == rp->type || FSAFE == rp->type) {
if (!memcmp(mac, txPeer.mac, sizeof(txPeer.mac))) {
process_data(mac, rp);
}
else {
Serial.printf("Wrong MAC: %s, %s\n", String(mac2str(mac)).c_str(), String(mac2str(txPeer.mac)).c_str() );
}
}
}
else {
Serial.printf("Wrong packet size: %d (must be %d)\n", count, sizeof(TXPacket_t));
}
}
void blink() {
static bool fast = true;
int state = digitalRead( GPIO_LED_PIN);
digitalWrite( GPIO_LED_PIN, !state);
uint32_t dataAge = millis()-recvTime;
if (dataAge > 100){
if (fast) {
blinker.attach(1, blink);
fast = false;
}
}
else {
if (!fast) {
blinker.attach(0.1, blink);
fast = true;
}
}
if (dataAge > FS_TIMEOUT) {
memcpy(locChannelOutputs, fsChannelOutputs, sizeof(locChannelOutputs));
}
}
void checkEEPROM() {
static bool blinking = false;
if (dirty) {
disablePPM();
EEPROM.put(0,txPeer);
EEPROM.put(sizeof(txPeer), fsChannelOutputs);
EEPROM.commit();
dirty = false;
enablePPM();
}
if (bindEnabled) {
if(millis()-startTime > BIND_TIMEOUT) {
bindEnabled = false;
}
}
else if(!blinking) {
#if defined(ESP8266)
wifi_set_channel(txPeer.channel);
#elif defined(ESP32)
esp_wifi_set_channel( txPeer.channel, (wifi_second_chan_t) 0);
#endif
blinker.attach(0.1, blink);
blinking = true;
}
}
void initRX(){
startTime = millis();
pinMode(GPIO_LED_PIN, OUTPUT);
EEPROM.begin(sizeof(txPeer)+sizeof(fsChannelOutputs));
EEPROM.get(0,txPeer);
EEPROM.get(sizeof(txPeer), fsChannelOutputs);
#if defined(ESP8266)
digitalWrite(GPIO_LED_PIN,0);
WiFi.mode(WIFI_STA);
wifi_set_channel(BIND_CH);
#elif defined(ESP32)
digitalWrite(GPIO_LED_PIN,1);
WiFi.mode(WIFI_STA);
esp_wifi_set_channel(BIND_CH, (wifi_second_chan_t) 0);
#endif
if (!WifiEspNow.begin()) {
Serial.println("WifiEspNow.begin() failed");
return;
}
WifiEspNow.onReceive(recv_cb, nullptr);
if (!ADD_PEER(txPeer.mac, txPeer.channel, ESP_IF_WIFI_STA)) {
Serial.printf("ADD_PEER() failed MAC: %s", mac2str(txPeer.mac));
}
if (!ADD_PEER(broadcast_mac, BIND_CH, ESP_IF_WIFI_STA)) {
Serial.printf("ADD_PEER() failed: MAC: %s", mac2str(broadcast_mac));
}
}