Sound Library

The mikroPascal PRO for ARM provides a Sound Library to supply users with routines necessary for sound signalization in their applications. Sound generation needs additional hardware, such as piezo-speaker (example of piezo-speaker interface is given on the schematic at the bottom of this page).

Library Routines

Sound_Init

Prototype

procedure Sound_Init(var snd_port, snd_pin: dword);
Description

Configures the appropriate MCU pin for sound generation.
Parameters
  • snd_port: sound output port address
  • snd_pin: sound output pin
Returns

Nothing.
Requires

Nothing.
Example

Stellaris

// Initialize the pin GPIO_PORTA.6 for playing sound
Sound_Init(GPIO_PORTA_DATA, 6);

MSP432

// Initialize the pin DIO_P6OUT.6 for playing sound
Sound_Init(DIO_P6OUT, 6);

STM32

// Initialize the pin GPIOE_ODR.14 for playing sound
Sound_Init(GPIOE_ODR, 14);

CEC1x02

// Initialize the pin for playing sound
Sound_Init(GPIO_OUTPUT_010_017, 1);
Notes

None.

Sound_Play

Prototype

procedure Sound_Play(freq_in_hz, duration_ms: word);
Description

Generates the square wave signal on the appropriate pin.
Parameters
  • freq_in_hz: signal frequency in Hertz (Hz)
  • duration_ms: signal duration in miliseconds (ms)
Returns

Nothing.
Requires

In order to hear the sound, you need a piezo speaker (or other hardware) on designated port. Also, you must call Sound_Init to prepare hardware for output before using this function.
Example 
// Play sound of 1KHz in duration of 100ms
Sound_Play(1000, 100);
Notes

None.