change case

Change the case of "Tablelamp.c".
2020-02-25 09:23:41 +08:00
parent 68793bed42
commit d2af7f1c09
1 changed files with 62 additions and 0 deletions
@@ -0,0 +1,62 @@
+/**********************************************************************
+* Filename    : Tablelamp.c
+* Description : DIY MINI table lamp
+* Author      : www.freenove.com
+* modification: 2019/12/27
+**********************************************************************/
+#include <wiringPi.h>
+#include <stdio.h>
+
+#define ledPin    0  	//define the ledPin
+#define buttonPin 1		//define the buttonPin
+int ledState=LOW;		//store the State of led
+int buttonState=HIGH;	//store the State of button
+int lastbuttonState=HIGH;//store the lastState of button
+long lastChangeTime;	//store the change time of button state
+long captureTime=50;	//set the stable time for button state 
+int reading;
+int main(void)
+{
+	printf("Program is starting...\n");
+	
+	wiringPiSetup(); //Initialize wiringPi.	
+	
+	pinMode(ledPin, OUTPUT);   //Set ledPin to output
+	pinMode(buttonPin, INPUT); //Set buttonPin to input
+
+	pullUpDnControl(buttonPin, PUD_UP);  //pull up to high level
+	while(1){
+		reading = digitalRead(buttonPin); //read the current state of button
+		if( reading != lastbuttonState){  //if the button state has changed, record the time point
+			lastChangeTime = millis();
+		}
+		//if changing-state of the button last beyond the time we set, we consider that 
+		//the current button state is an effective change rather than a buffeting
+		if(millis() - lastChangeTime > captureTime){
+			//if button state is changed, update the data.
+			if(reading != buttonState){
+				buttonState = reading;
+				//if the state is low, it means the action is pressing
+				if(buttonState == LOW){
+					printf("Button is pressed!\n");
+					ledState = !ledState; //Reverse the LED state
+					if(ledState){
+						printf("turn on LED ...\n");
+					}
+					else {
+						printf("turn off LED ...\n");
+					}
+				}
+				//if the state is high, it means the action is releasing
+				else {
+					printf("Button is released!\n");
+				}
+			}
+		}
+		digitalWrite(ledPin,ledState);
+		lastbuttonState = reading;
+	}
+
+	return 0;
+}
+