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Your basic requirements are the generation of Pulse Width Modulation (PWM), of which the defacto square wave is PWM with a 50% duty cycle, half the period of the waveform ON and the other half OFF.
There are primarily two ways of generating PWM, through software/bit-banging or using a hardware PWM module on the MCU.
void main()
{
while (1) {
output_high(PIN_B4);
delay_us(500); // change the delay as per the frequency you need
output_low(PIN_B4);
delay_us(500);// change the delay as per the frequency you need
}
}
void main()
{
while (1) {
output_high(PIN_B4);
delay_us(500); // change the delay as per the frequency you need
output_low(PIN_B4);
delay_us(500);// change the delay as per the frequency you need
}
}
The above example would be the software/bit-bang method. The major drawback of such an implementation is the entire MCU is dedicated to generating the square wave and no other task. There are usually better alternatives to PWM generation, these largely depend on your particular MCU/processor and its features.
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