Hallo Gemeinde
Ich habe ein Projekt mit einem LTE-Modul (SIM7600) am Laufen. Das Problem ist, dass das Modul per default auf 115200 Baud eingestellt ist. Diese Rate ist für meinen Code aber zu schnell, d.h. Zeichen (z.B. von einem SMS) werden nicht richtig gelesen. Mit 9600 funktioniert der Code einwandfrei. Nur kann ich die Baudrate leider nicht permanent ändern. Deshalb muss ich sie beim Powerup per AT-Command (AT+IPR=) ändern. Doch leider will das nicht funktionieren, der Code bleibt im Setup hängen. Hat jemand eine Idee?
/*
Project: Interfacing SIM7600 GSM Module with Maker UNO
Item used:
- Maker UNO https://www.cytron.io/p-maker-uno
- SIM7600 https://www.cytron.io/p-4g-3g-2g-gsm-gprs-gnss-hat-for-raspberry-pi
*/
#include <SoftwareSerial.h>
#include "Adafruit_FONA.h"
#define BUTTON 2
#define BUZZER 8
#define LED13 13
#define GSM_RX 8
#define GSM_TX 7
#define GSM_PWR 5
#define GSM_RST 20 // Dummy
//#define GSM_BAUD 9600
char replybuffer[255];
SoftwareSerial SIM7600SS = SoftwareSerial(GSM_TX, GSM_RX);
SoftwareSerial *SIM7600Serial = &SIM7600SS;
Adafruit_FONA SIM7600 = Adafruit_FONA(GSM_RST);
uint8_t readline(char *buff, uint8_t maxbuff, uint16_t timeout = 0);
char SIM7600InBuffer[64]; // For notifications from the FONA
char callerIDbuffer[32]; // We'll store the SMS sender number in here
char SMSbuffer[32]; // We'll store the SMS content in here
uint16_t SMSLength;
String SMSString = "";
boolean buttonEnable = false;
void setup()
{
pinMode(BUTTON, INPUT_PULLUP);
pinMode(BUZZER, OUTPUT);
pinMode(LED13, OUTPUT);
pinMode(GSM_PWR, OUTPUT);
delay(1000);
pinMode(GSM_PWR, INPUT_PULLUP);
Serial.begin(115200);
Serial.println("Interfacing SIM7600 GSM Module with Maker UNO");
Serial.println("Initializing... (May take a minute)");
playStartMelody();
delay(15000);
//SIM7600.write("AT+IPR=9600");
// Make it slow so its easy to read!
SIM7600Serial->begin(115200);
delay(1000);
SIM7600.write("AT+IPR=9600");
delay(1000);
SIM7600Serial->end();
delay(1000);
SIM7600Serial->begin(9600);
if (!SIM7600.begin(*SIM7600Serial)) {
Serial.println("Couldn't find SIM7600");
playErrorMelody();
while (1);
}
Serial.println(F("SIM7600 is OK"));
// Print SIM card IMEI number.
char imei[16] = {0}; // MUST use a 16 character buffer for IMEI!
uint8_t imeiLen = SIM7600.getIMEI(imei);
if (imeiLen > 0) {
Serial.print("SIM card IMEI: "); Serial.println(imei);
}
SIM7600Serial->print("AT+CNMI=2,1\r\n"); // Set up the SIM800L to send a +CMTI notification when an SMS is received
playReadyMelody();
Serial.println("GSM is ready!");
delay(1000);
delay(1000);
}
void loop()
{
char* bufPtr = SIM7600InBuffer; // Handy buffer pointer
if (SIM7600.available()) { // Any data available from the SIM800L
int slot = 2; // This will be the slot number of the SMS
int charCount = 0;
// Read the notification into fonaInBuffer
do {
*bufPtr = SIM7600.read();
Serial.write(*bufPtr);
delay(1);
} while ((*bufPtr++ != '\n') && (SIM7600.available()) && (++charCount < (sizeof(SIM7600InBuffer) - 1)));
// Add a terminal NULL to the notification string
*bufPtr = 0;
// Scan the notification string for an SMS received notification.
// If it's an SMS message, we'll get the slot number in 'slot'
if (1 == sscanf(SIM7600InBuffer, "+CMTI: \"SM\",%d", &slot)) {
playSmsMelody();
Serial.print("slot: "); Serial.println(slot);
// Retrieve SMS sender address/phone number.
if (!SIM7600.getSMSSender(slot, callerIDbuffer, 31)) {
Serial.println("Didn't find SMS message in slot!");
}
Serial.print("FROM: "); Serial.println(callerIDbuffer);
if (!SIM7600.readSMS(slot, SMSbuffer, 250, &SMSLength)) { // pass in buffer and max len!
Serial.println("Failed!");
}
else {
SMSString = String(SMSbuffer);
Serial.print("SMS: "); Serial.println(SMSString);
}
// Compare SMS string
if (SMSString == "ENABLE BUTTON") {
Serial.print("Button is enable.");
buttonEnable = true;
delay(100);
// Send SMS for status
if (!SIM7600.sendSMS("+41787978606", "Button is enable.")) { // callerIDbuffer ersetzt durch Nummer
Serial.println("Failed");
}
else {
Serial.println(F("Sent!"));
}
}
else if (SMSString == "LED13 ON") {
Serial.print("Setting LED 13 to on.");
digitalWrite(LED13, HIGH);
delay(100);
// Send SMS for status
if (!SIM7600.sendSMS(callerIDbuffer, "Setting LED to on.")) {
Serial.println("Failed");
}
else {
Serial.println(F("Sent!"));
}
}
else if (SMSString == "LED13 OFF") {
Serial.print("Setting LED 13 to off.");
digitalWrite(LED13, LOW);
delay(100);
// Send SMS for status
if (!SIM7600.sendSMS(callerIDbuffer, "Setting LED to off.")) {
Serial.println("Failed");
}
else {
Serial.println(F("Sent!"));
}
}
else {
Serial.print("Invalid command.");
playErrorMelody();
}
// Delete the original msg after it is processed
// otherwise, we will fill up all the slots
// and then we won't be able to receive SMS anymore
while (1) {
boolean deleteSMSDone = SIM7600.deleteSMS(slot);
if (deleteSMSDone == true) {
Serial.println("OK!");
break;
}
else {
Serial.println("Couldn't delete, try again.");
}
}
}
}
if (digitalRead(BUTTON) == LOW && buttonEnable == true) {
buttonEnable = false;
playButtonMelody();
// Send SMS for status
if (!SIM7600.sendSMS(callerIDbuffer, "Button is pressed!")) {
Serial.println("Failed");
}
else {
Serial.println(F("Sent!"));
}
}
}
void playTone(int *melody, int *melodyDur, int notesLength)
{
for (int i = 0; i < notesLength; i++) {
int noteDuration = 1000 / melodyDur[i];
tone(BUZZER, melody[i], noteDuration);
delay(noteDuration);
noTone(BUZZER);
}
}
