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Analyze an embedded C program What does this part of the code mean in terms of...

Analyze an embedded C program

What does this part of the code mean in terms of the "if" and "while" statements

void blinkLed ( int blinkDelay, int ledPin )
{
static int blinkState = 0 ;
static int blinkTime = 0 ;
  
int currTime = millis ( ) ;
if ( ( currTime - blinkTime ) > blinkDelay )
{
blinkTime = currTime ;
if ( blinkState )
{
digitalWrite ( ledPin, HIGH ) ;
}
else
{
digitalWrite ( ledPin, LOW ) ;
}
blinkState = !blinkState ;
}
}


void beep ( int duration )
{
int startTime = millis ( ) ;
int currTime ;

while ( ( currTime - startTime ) < duration )
{
digitalWrite ( buzzerOutputPin, HIGH ) ;
delayMicroseconds ( 500 ) ;
digitalWrite ( buzzerOutputPin, LOW ) ;
delayMicroseconds ( 500 ) ;
currTime = millis ( ) ;
}
}

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Answer #1

I'll explain what both functions beep() and blinkLed() do with pseudo code and sample dry run.

- blinkLed() will turn the LED on/off for the time period specified by blinkDelay i.e. change LED state once time blinkDelay has passed.

- beep() will toggle (turn on/off repeatedly) the LED state for the time duration. The toggle period will be 500 microseconds. After time duration, it will turn the LED to off state.

Explanation:

- Below is the pseudo code that tells what blinkLed() do.

- Below is the sample dry run for blinkLed() function.

- Below is the pseudo code that tells what beep() will do.

- Below is the sample dry run for beep() function.

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