Hi,
I'm trying to learn syntax and am using the edge detection tutorial as practise. I can't get which starting brace works with which ending one.
I can't read code and translate to pseudo code to plain English yet to work out the logical grouping of statements.
Some help, using this as an example, would be great.
Cheers guys.
// declarations
// constant variables
const int buttonPin = 2;
const int ledPin = 13;
// variable variables
int buttonCount = 0; // counts the button presses
int buttonState = 0; // current number of button presses
int lastButtonState = 0; //last number of button presses
void setup () {
// code to run once
pinMode (buttonPin, INPUT);
pinMode (ledPin, OUTPUT);
Serial.begin (9600);
}
void loop() {
// put your main code here, to run repeatedly:
// read the buttonPin
buttonState = digitalRead (buttonPin);
// compare buttonState to the lastbuttonState
if (buttonState != lastButtonState){
// if the buttonState is high then the button went from Off to On
if (buttonState == HIGH){
// then increment the buttonCount
buttonCount ++;
// and print to the serial monitor
Serial.println("On");
Serial.print("number of button pushes: ");
Serial.println(buttonCount);
// but if it didn't
} else {
// then if the buttonState is low, it went from On to Off
Serial.println ("Off");
}
delay (50);
lastButtonState = buttonState;
// turn on the LED every four button pushes by checking the modulo of buttonCount
if (buttonCount % 4 ==0) {
digitalWrite(ledPin, HIGH);
} else {
digitalWrite (ledPin, LOW);
}
}
}
Here is the program Auto Formatted in the IDE and with each { and } on its own line.
Doing this makes it much more obvious whech { belongs with which }
In the IDE, if you click just after a { then the corresponding ? will be indicated
// declarations
// constant variables
const int buttonPin = 2;
const int ledPin = 13;
// variable variables
int buttonCount = 0; // counts the button presses
int buttonState = 0; // current number of button presses
int lastButtonState = 0; //last number of button presses
void setup ()
{
// code to run once
pinMode (buttonPin, INPUT);
pinMode (ledPin, OUTPUT);
Serial.begin (9600);
}
void loop()
{
// put your main code here, to run repeatedly:
// read the buttonPin
buttonState = digitalRead (buttonPin);
// compare buttonState to the lastbuttonState
if (buttonState != lastButtonState)
{
// if the buttonState is high then the button went from Off to On
if (buttonState == HIGH)
{
// then increment the buttonCount
buttonCount ++;
// and print to the serial monitor
Serial.println("On");
Serial.print("number of button pushes: ");
Serial.println(buttonCount);
// but if it didn't
}
else
{
// then if the buttonState is low, it went from On to Off
Serial.println ("Off");
}
delay (50);
lastButtonState = buttonState;
// turn on the LED every four button pushes by checking the modulo of buttonCount
if (buttonCount % 4 == 0)
{
digitalWrite(ledPin, HIGH);
}
else
{
digitalWrite (ledPin, LOW);
}
}
}
Each {} pair encloses a block of code such as here
if (buttonState == HIGH)
{
// then increment the buttonCount
buttonCount ++;
// and print to the serial monitor
Serial.println("On");
Serial.print("number of button pushes: ");
Serial.println(buttonCount);
// but if it didn't
}
If the test at the start returns true then the block of code will be executed.
You don't need "--style=allman", "--style=bsd", "--style=break", and "-A1" since they all mean the same thing. You only need one of them. Other styles are available. The options with "--" don't need "--" in the configuration file.
For Mac users:
Ctrl-Click on Arduino.app and select "Show Package Content". The formatter.conf file is in Contents/Java/lib.
Note that the Arduino IDE uses an outdated version of Artistic Style (2.05.1) and that documentation is for 3.1 so not all the options on that page work.
