我正在尝试从Nodemcu(esp8266)向ESP32发送一些数据。我试图为此目的使用espnow,但我确实遇到了麻烦,我无法合并两个板的主控和从属,我发现代码相差很大,我尝试了一些修改,并且可以从Nodemcu发送数据,但是可以在ESP32上无法接收。我正在尝试为手势控制汽车发送两个模拟值。
下面提供在Nodemcu上运行的主代码或控制器代码
#include <ESP8266WiFi.h>
#include <espnow.h>
#define MUX_A D4
#define MUX_B D3
#define MUX_C D2
#define ANALOG_INPUT A0
#define CHANNEL 4
extern "C" {
}
uint8_t remoteMac[] = {0x24, 0x6F, 0x28, 0xB6, 0x24, 0x49};
struct __attribute__((packed)) DataStruct {
//char text[32];
int x;
int y;
unsigned long time;
};
DataStruct myData;
unsigned long lastSentMillis;
unsigned long sendIntervalMillis = 1000;
unsigned long sentMicros;
unsigned long ackMicros;
int xAxis;
int yAxis;
int zAxis;
void InitESPNow() {
WiFi.disconnect();
if (esp_now_init()==0) {
Serial.println("ESPNow Init Success");
}
else {
Serial.println("ESPNow Init Failed");
// Retry InitESPNow, add a counte and then restart?
// InitESPNow();
// or Simply Restart
ESP.restart();
}
}
void sendData() {
if (millis() - lastSentMillis >= sendIntervalMillis) {
lastSentMillis += sendIntervalMillis;
myData.time = millis();
uint8_t bs[sizeof(myData)];
memcpy(bs, &myData, sizeof(myData));
sentMicros = micros();
esp_now_send(NULL, bs, sizeof(myData)); // NULL means send to all peers
Serial.println("sent data");
Serial.println(myData.x);
Serial.println(myData.y);
}
}
void sendCallBackFunction(uint8_t* mac, uint8_t sendStatus) {
ackMicros = micros();
Serial.print("Trip micros "); Serial.println(ackMicros - sentMicros);
Serial.printf("Send status = %i", sendStatus);
Serial.println();
Serial.println();
}
void setup() {
Serial.begin(115200); Serial.println();
Serial.println("Starting EspnowController.ino");
WiFi.mode(WIFI_STA); // Station mode for esp-now controller
WiFi.disconnect();
Serial.printf("This mac: %s, ", WiFi.macAddress().c_str());
Serial.printf("slave mac: %02x%02x%02x%02x%02x%02x", remoteMac[0], remoteMac[1], remoteMac[2], remoteMac[3], remoteMac[4], remoteMac[5]);
Serial.printf(", channel: %i\n",CHANNEL);
InitESPNow();
esp_now_set_self_role(ESP_NOW_ROLE_CONTROLLER);
esp_now_add_peer(remoteMac, ESP_NOW_ROLE_SLAVE, CHANNEL, NULL, 0);
esp_now_register_send_cb(sendCallBackFunction);
Serial.print("Message ");
pinMode(MUX_A, OUTPUT);
pinMode(MUX_B, OUTPUT);
pinMode(MUX_C, OUTPUT);
Serial.println("Setup finished");
}
void changeMux(int c, int b, int a) {
digitalWrite(MUX_A, a);
digitalWrite(MUX_B, b);
digitalWrite(MUX_C, c);
}
void loop() {
changeMux(LOW, LOW, LOW);
xAxis = analogRead(ANALOG_INPUT); //Value of the sensor connected to pin 0 of IC
changeMux(LOW, LOW, HIGH);
yAxis = analogRead(ANALOG_INPUT); //Value of the sensor connected to pin 1 of IC
changeMux(LOW, HIGH, LOW);
zAxis = analogRead(ANALOG_INPUT); //Value of the sensor connected to pin 2 of IC
changeMux(LOW, HIGH, LOW);
myData.x= xAxis;
myData.y= yAxis;
sendData();
delay(500);
}
ESP32上运行的从站代码如下
#include <esp_now.h>
#include <WiFi.h>
#include <esp_wifi.h>
#define CHANNEL 4
uint8_t mac[] = {0x36, 0x33, 0x33, 0x33, 0x33, 0x33};
struct __attribute__((packed)) DataStruct {
//char text[32];
int x;
int y;
unsigned long time;
};
DataStruct myData;
// Init ESP Now with fallback
void setup() {
Serial.begin(115200);
Serial.println("ESPNow/Basic/Slave Example");
//Set device in AP mode to begin with
WiFi.mode(WIFI_AP);
// configure device AP mode
// This is the mac address of the Slave in AP Mode
esp_wifi_set_mac(ESP_IF_WIFI_STA, &mac[0]);
Serial.print("AP MAC: "); Serial.println(WiFi.softAPmacAddress());
// Init ESPNow with a fallback logic
if (esp_now_init()!=0) {
Serial.println("*** ESP_Now init failed");
while(true) {};
}
// Once ESPNow is successfully Init, we will register for recv CB to
// get recv packer info.
esp_now_register_recv_cb(OnDataRecv);
Serial.print("Aheloiioi");
}
// callback when data is recv from Master
void OnDataRecv(const uint8_t *mac_addr, const uint8_t *data, int data_len) {
memcpy(&myData, data, sizeof(myData));
char macStr[18];
snprintf(macStr, sizeof(macStr), "%02x:%02x:%02x:%02x:%02x:%02x",
mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3], mac_addr[4], mac_addr[5]);
Serial.print("Last Packet Recv from: "); Serial.println(macStr);
Serial.print("Last Packet Recv Data: "); Serial.println(myData.x); Serial.println(myData.y);
Serial.println("");
}
void loop() {
// Chill
}
这是我在ESP32上获得的唯一输出
ESPNow/Basic/Slave Example
AP MAC: 24:6F:28:B6:24:49
Aheloiioi
虽然这是Nodemcu上的输出
Starting EspnowController.ino
This mac: BC:DD:C2:B5:E3:2B, slave mac: 246f28b62449, channel: 4
ESPNow Init Success
Message Setup finished
sent data
10
8
Trip micros 7320
Send status = 1
sent data
9
8
Trip micros 6817
Send status = 1
sent data
10
9
Trip micros 6731
Send status = 1
并且继续
如果还有其他发送数据的方法,请提及
我以前从未使用过esp_now,所以我自己也没有对其进行测试,但是我认为这与库或esp32无关,这只是c ++使用中的一个小错误。
在esp8266的sendData()
功能上,您这样做:
uint8_t bs[sizeof(myData)];
memcpy(bs, &myData, sizeof(myData));
sentMicros = micros();
esp_now_send(NULL, bs, sizeof(myData));
bs
的类型为uint8_t
,它是一个数组,您尝试将结构类型为myData
的数据复制到该数组中。然后,您尝试将数组传递到esp_now_send()
。我迅速看了一下esp_now_send()
函数原型定义,esp_now_send()
需要传入数据结构uint8_t
的address(类型为myData
)。
我不知道您为什么需要执行memcpy,但是我认为将myData
的指针直接传递到函数调用中会更加容易和简单。
void sendData() {
if (millis() - lastSentMillis >= sendIntervalMillis) {
lastSentMillis += sendIntervalMillis;
myData.time = millis();
esp_now_send(NULL, (uint8_t *)&myData, sizeof(myData)); // NULL means send to all peers
Serial.println("sent data");
Serial.println(myData.x);
Serial.println(myData.y);
}
}
请让我知道是否可行?