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  1. Hello everyone! I am using the SIM800L module to send SMS through a TivaC TM4C123GXL board, but its clock is 80MHz, and the library only accepts 20, 16 or 8 MHz. In Arduino it worked perfectly, this code found on a website. How do I reduce the TM4C123 clock in Power software? Is there another solution? Thanks in advance! The code: #include <SoftwareSerial.h> SoftwareSerial sim(3, 4); int _timeout; String _buffer; String number = ""; //here I inserted my number phone void setup() { delay(4000); //delay for 7 seconds to make sure the modules get the signal Serial.begin(9600); _buffer.reserve(50); Serial.println("Sistem Started..."); sim.begin(9600); delay(1000); } void loop() { SendMessage(); delay(10000); } void SendMessage() { //Serial.println ("Sending Message"); sim.println("AT+CMGF=1"); //Sets the GSM Module in Text Mode delay(1000); //Serial.println ("Set SMS Number"); sim.println("AT+CMGS=\"" + number + "\"\r"); //Mobile phone number to send message delay(1000); String SMS = "Testing GSM module"; sim.println(SMS); delay(100); sim.println((char)26);// ASCII code of CTRL+Z delay(1000); _buffer = _readSerial(); } String _readSerial() { _timeout = 0; while (!sim.available() && _timeout < 12000 ) { delay(13); _timeout++; } if (sim.available()) { return sim.readString(); } } The error: #error This version of SoftwareSerial supports only 20, 16 and 8MHz processors