Question

我正在使用NRF24L01进行无线通信。我的发射机代码是：

#include  <SPI.h>
#include "nRF24L01.h"
#include "RF24.h"

//int msg[1];
RF24 radio(2,9); // CSN, CE
const uint64_t pipe = 0xE8E8F0F0E1LL;

void setup(){
        Serial.begin(9600);
        radio.begin();
        radio.openWritingPipe(pipe);
        radio.setPALevel(RF24_PA_MIN);
        radio.stopListening();
        Serial.println("################## Set up complete ######################");
}

void loop(){
        const char data[] = "hello world!";
        radio.write(&data, sizeof(data));
        Serial.println("message sent");
        delay(1000);
}

我的接收方代码是：

#include "nRF24L01.h"
#include "RF24.h"
#include "SPI.h"

RF24 radio(8,7); // (CSN, CE)
const uint64_t pipe = 0xE8E8F0F0E1LL;

void setup(){
        Serial.begin(9600);
        radio.begin(); // Start the NRF24L01
        radio.openReadingPipe(1,pipe); // Get NRF24L01 ready to receive
        Serial.print("pipe open ... ");
        radio.setPALevel(RF24_PA_MIN);
        radio.startListening(); // Listen to see if information received
        Serial.println("Listening: ready to recieve ...");
}

void loop(){
        Serial.print("checking for radio signal ... ");
        if (radio.available()){
                Serial.print("| radio available | ");
                char data[32] = ""; // delcare data
                radio.read(&data, sizeof(data)); // read data from transmitter
                Serial.println(data);   // print data to serial
        }
        else {
                Serial.println("   Nothing");   // print if nothing read
        }
        delay(500);
}

当发送器发送其数据时，接收器应该打印：

"checking for radio signal | radio available | "hello world!"

或者当发送方没有发送数据时，接收方会打印：

checking for radio signal | nothing

但是，接收方正在打印：

b'checking for radio signal ...    Nothing\r\n'
b'checking for radio signal ...    Nothing\r\n'
b'checking for radio signal ... | radio available | \xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x04\x18\x03?\x01fpipe open ... \r\n'
b'checking for radio signal ... | radio available | \xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x04\x18\x03?\x01fpipe open ... \r\n'
b'checking for radio signal ...    Nothing\r\n'
b'checking for radio signal ...    Nothing\r\n'

有人知道为什么我没有看到“ hello world”，而是得到了奇怪的字符串吗？

注意：即使关闭发射器，我也会得到相同的输出。

Answer 1

在接收代码中，还存在逻辑错误。当您直接打印“已发送的消息”而没有任何条件时，无论消息是发送还是丢失，每次都会执行该消息。相反，您应该使用

if(radio.write(&data, sizeof(data))){
    Serial.println("Message Sent");
}else{
    Serial.println("Message not sent");
}

因为radio.write如果数据到达接收器，则返回TRUE。否则返回FALSE，表示数据已丢失。这样做，您将意识到该消息不是仅被发送。在RF24无线电（CE，CSN）中，CSN之前还提到了CE。

从NRF24L01接收的数据有问题

1 个答案: