ABL electronic PIC Microcontrollers PIC16 - Manual (Page 273)

The example is a simple demonstration of how to use sound library for playing
tones on a piezo speaker. The code can be used with any MCU that has PORTB
and ADC on PORTA. Sound frequencies in this example are generated by reading
the value from ADC and using the lower byte of the result as base for T (f = 1/T).
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mikroC - C Compiler for Microchip PIC microcontrollers
mikroC
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Library Example
int adcValue;
void main() {
PORTB = 0; // Clear PORTB
TRISB = 0; // PORTB is output
INTCON = 0; // Disable all interrupts
ADCON1 = 0x82; // Configure VDD as Vref, and analog channels
TRISA = 0xFF; // PORTA is input
Sound_Init(PORTB, 2); // Initialize sound on RB2
while (1) { // Play in loop:
adcValue = ADC_Read(2); // Get lower byte from ADC
Sound_Play(adcValue, 200); // Play the sound
}
}