Simulink-Arduino-Serial

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I have tried your code to control a stepper motor through matlab, but I have a problem where the motor keeps running away all the time turns out the getFloat() keeps returning a inf number when not connected to anything. Im not sure where my problem lies here are the code that I used to recreate the problem.

`// Create a union to easily convert float to byte typedef union{ float number; uint8_t bytes[4]; } FLOATUNION_t;

// Create the variables you want to receive FLOATUNION_t myValue1; FLOATUNION_t myValue2; FLOATUNION_t myValue3; FLOATUNION_t myValue4; FLOATUNION_t myValue5; FLOATUNION_t myValue6;

// Create the variables to send FLOATUNION_t send1; FLOATUNION_t send2; FLOATUNION_t send3;

void setup() { // initialize serial, use the same boudrate in the Simulink Config block Serial1.begin(115200);

} void loop(){ // Get the floats from serial myValue1.number = getFloat(); // Give your float a value myValue2.number = getFloat(); // Give your float a value myValue3.number = getFloat(); // Give your float a value myValue4.number = getFloat(); // Give your float a value myValue5.number = getFloat(); // Give your float a value myValue6.number = getFloat(); // Give your float a value

// Do whatever you want here Serial1.println(myValue1.number); Serial1.println("GAE"); //Serial1.println(myValue1);

// Send some variables back send1.number = myValue1.number+myValue2.number; send2.number = myValue3.number+myValue4.number; send3.number = myValue5.number+myValue6.number;

// Print header: Important to avoid sync errors! Serial1.write('A');

// Print float data for (int i=0; i<4; i++){ Serial1.write(send1.bytes[i]); } for (int i=0; i<4; i++){ Serial1.write(send2.bytes[i]); } for (int i=0; i<4; i++){ Serial1.write(send3.bytes[i]); } // Print terminator Serial1.print('\n');

// Use the same delay in the Serial Receive block delay(50); }

float getFloat(){ int cont = 0; FLOATUNION_t f; while (cont < 4 ){ f.bytes[cont] = Serial1.read() ; cont = cont +1; } return f.number; }`