Hello everyone, I'm trying setup pwm frequency for tiva C in Energia but failed at this line: analogFrequency(PWM_FREQ) // define PWM pins #define PWM_1 PD_6 // define PWM frequency #define PWM_FREQ 20000 void setup() {   pinMode(PWM_1, OUTPUT);   analogFrequency(PWM_FREQ); } void loop() {    analogWrite(PWM_1, 50); }   Can help me with the problem, thank!