GSM 和 SD 不能一起工作 Arduino

Question

我正在尝试使 GSM 扩展板与 SD 扩展板一起工作，即每次收到消息时都应将其保存到 SD 卡上。然而这似乎不起作用。奇怪的是，错误似乎每次都会在不同的地方出现。有时循环会停止在 sms.flush();但有时它会在 lastMess = ""; 处遇到问题。而且，这些字符经常被打乱并形成奇怪的符号。 我认为问题可能与串行监视器、GSM 扩展板和 SD 卡的通信有关。 SPI/串行协议问题。我还尝试用串行监视器输入替换 SMS 输入，并将其写入 SD，但这带来了更多问题。 预先感谢您！

#include <SPI.h>
#include <SD.h>
File dataFile;
const int chipSelect = 4;
// include the GSM library
#include <GSM.h>

// PIN Number for the SIM
#define PINNUMBER ""

// initialize the library instances
GSM gsmAccess;
GSM_SMS sms;

// Array to hold the number a SMS is retreived from
char senderNumber[20];
char Content[20];
String lastMess;
char c;
String txtmsg;
String readString;
void setup()
{
  // initialize serial communications and wait for port to open:
  while (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
     //return;
  }

  Serial.begin(9600);

  Serial.println("SMS Messages Receiver");

  // connection state
  boolean notConnected = true;

  // Start GSM connection
  while (notConnected)
  {
    if (gsmAccess.begin(PINNUMBER) == GSM_READY)
      {
      notConnected = false;
      }
    else
    {
      Serial.println("Not connected");
      delay(1000);
    }
  }

  Serial.println("GSM initialized");
  Serial.println("SD initialized");
  Serial.println("Waiting for messages");
}

void loop()
{

  lastMess = "";
  Serial.println("BeginLoop");
  if (sms.available())
  {
    Serial.println("Message received from:");

    // Get remote number
    sms.remoteNumber(senderNumber, 20);
    Serial.println(senderNumber);

      // Read message bytes and print them
    while (c = sms.read())
      {
      Serial.print(c);      
      String nextChar = String (c);
      String Mess = (lastMess + nextChar);
      lastMess = Mess;
      }
    Serial.println("This is the message content:");  
    Serial.println(lastMess);
    Serial.println("\nEND OF MESSAGE");
    // Delete message from modem memory
    sms.flush();
    Serial.println("MESSAGE DELETED");    

    dataFile = SD.open("datalog.csv", FILE_WRITE);

  if (dataFile)
          {
            dataFile.print(senderNumber);
            dataFile.print(",");
            dataFile.print(lastMess);
            dataFile.print(",");
            dataFile.println("time e.g. 12:00");
            dataFile.close();
            delay(1000);            
            Serial.println("Content written to SD");
          }


  else if (!dataFile)
  {

    Serial.println("SD not opened");
  }
  // if the file isn't open, pop up an error:
  else 
  {
    Serial.println("error opening datalog.csv");
  }
   Serial.println("Is SD being skipped?");
  }

  delay(1000);
  Serial.println("EndLoop");



}

Answer 1

答案竟然在arduino的内存中，我得到了以下消息： “可用内存不足，可能会出现稳定性问题。” 这扰乱了字符并引发了问题。减少代码以使用更少的内存后，一切正常！

Answer 2

我正在使用 sim800l EVB，并且遇到了同样的问题。 当我调试以找出未执行的内容时，发现是 isReady() 函数。

#include <SoftwareSerial.h>
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include "EmonLib.h"
#include "SIM800L.h"
#include <SPI.h>
#include <SD.h>

// Define pin constants
#define SIM800_RX_PIN 2
#define SIM800_TX_PIN 3
#define SIM800_RST_PIN 7

// Define configuration constants
const int chipSelect = 4;
const char APN[] = "internet";
const char URL[] = "http://api.restful-api.dev/objects";
const char CONTENT_TYPE[] = "application/json";
const char PAYLOAD[] = "{\"name\": \"Apple MacBook Pro 16\", \"data:{\"year\": 2019, \"price\": 1849.99, \"CPU model\": \"Intel Core i9\", \"Hard disk size\": \"1 TB\"}}";


void setup() {
  // Initialize LCD display
  lcd.init();
  lcd.backlight();

  // Initialize serial communication for debugging
  Serial.begin(115200);
  while (!Serial);




  initializationOf("GSM");

  // Initialize GSM and SIM800L module
  initializeGSM();

  initializationOf("SD card");

  // Initialize SD card module
  //initializeSDCard();
  // Configure EnergyMonitor
  emon1.voltage(A0, 110.75, 1.7);

  // Clear LCD display
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("MEASURED VOLTAGE");
}

void loop() {
  // Calculate voltage
  emon1.calcVI(20, 2000);
  volt = emon1.Vrms;

  // Display voltage on LCD
  lcd.setCursor(0, 1);
  lcd.print("VOLTAGE = ");
  lcd.print(volt);
  lcd.print("V         ");

  // Check if counter has reached 5
  if (counter >= 5) {
    // Perform data upload and reset counter
    timeUpForPushToDB();
    counter = 0;
  }

  // Increment counter
  counter++;

  // Add delay to control loop frequency
  delay(500);
}

// Function to initialize GSM and SIM800L module
void initializeGSM() {
  // Initialize SoftwareSerial for SIM800 module
  SoftwareSerial* serials = new SoftwareSerial(SIM800_RX_PIN, SIM800_TX_PIN);


  serials->begin(9600);
  delay(1000);

  // Initialize SIM800L module

  sim800l = new SIM800L((Stream*)serials, SIM800_RST_PIN, 200, 512);

  // Perform module setup
  setupModule();
}


void initializeSDCard() {
  Serial.print("Initializing SD card...");

  // See if the card is present and can be initialized
  if (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
    // Don't do anything more
    while (1);
  }
  Serial.println("card initialized.");
}

void setupModule() {
  // Wait until the module is ready to accept AT commands
 

  while (!sim800l->isReady()) {
    Serial.println(F("Problem to initialize AT command, retry in 1 sec"));
    delay(1000);
  }

  Serial.println(F("Setup Complete!"));

  // Wait for GSM signal
  uint8_t signal = sim800l->getSignal();
  while (signal <= 0) {
    delay(1000);
    signal = sim800l->getSignal();
  }
  Serial.print(F("Signal OK (strength: "));
  Serial.print(signal);
  Serial.println(F(")"));
  delay(1000);

  // Wait for operator network registration
  NetworkRegistration network = sim800l->getRegistrationStatus();
  while (network != REGISTERED_HOME && network != REGISTERED_ROAMING) {
    delay(1000);
    network = sim800l->getRegistrationStatus();
  }
  Serial.println(F("Network registration OK"));
  delay(1000);

  // Setup GPRS configuration
  bool success = sim800l->setupGPRS(APN);
  while (!success) {
    success = sim800l->setupGPRS(APN);
    delay(5000);
  }
  Serial.println(F("GPRS config OK"));
}