Merge https://git.omegav.no/avrkurs/attinykurs

Session2/PWM/main.c

-/*
- * PWM-LF.c
- *
- * Created: 29.01.2017 23:43:39
- * Author : Petter
- */ 
-
-#define F_CPU 3333333UL
-
-
-#include <avr/io.h>
-#include <util/delay.h>
-#include <avr/interrupt.h>
-
-
-#define LED1 0 // port B, connected to WO0
-#define LED2 1 // port B, connected to WO1
-#define LED3 4 // Port B
-#define SW1 5 // Port A
-#define SW2 6 // Port A
-#define SW3 7 // Port A
-
-
-
-int main(void)
-{
-	//Set up the leds and buttons. You might want to copy this from previous exercises.
-	
-	/*We will be using timer 1 in single (not split) mode.
-	  It is highly recommended that you read chapter 20.3.3.4 in the datasheet 
-	  on timer compare channels.
-	  There you will find a sub-capter on the single-slope PWM we will be using.
-	*/
-	
-	//First, enable the timer
-	
-	
-	//Set the mode of the timer to single slope PWM 
-	
-	
-	//We have to override the normal pin opperation so the PWM is pushed directly to the pin
-	//Hint: WO0 and WO1 are connected to leds. We need to override them to get the PWM out.
-	
-	
-	
-	/*Timer A is a 16 bit timer. This will give us a frequency of 25Hz, we can see it flicker.
-	  By lowering the period, (PER) we get higher frequency at the cost of lower resolution.
-	*/
-	
-	//Set the period to 12 bit. (This results in a frequency of ~400Hz.)
-	
-	
-	//We can now control the PWM duty cycle by simply writing values to the CMP0 and CMP1 registers.
-	TCA0.SINGLE.CMP0 = 0x0000; //Max brightness (Leds are inverted)
-	TCA0.SINGLE.CMP1 = 0x0fff; //Min brightness (Leds are inverted)
-	
-	
-    while(1){
-		
-		/*Have some fun with the leds. Examples:
-		  Have them fade between max and min
-		  Have them fade in a pattern (Heartbeat?) 
-		  Change the brightness based on buttons
-
-		*/
-		
-    }
-}
-
+
+#define F_CPU 3333333UL
+
+
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+
+
+#define LED1 0 // port B, connected to WO0
+#define LED2 1 // port B, connected to WO1
+#define LED3 4 // Port B
+#define SW1 5 // Port A
+#define SW2 6 // Port A
+#define SW3 7 // Port A
+
+/*
+    In this exercise, you will use PWM to control thwe brightness of LEDs
+    Once we have PWM set up, controling the brightness is super easy!
+*/
+
+int main(void)
+{
+	//Set up the leds and buttons. You might want to copy this from previous exercises.
+	
+	/*We will be using timer 1 in single (not split) mode.
+	  It is highly recommended that you read chapter 20.3.3.4 in the datasheet 
+	  on timer compare channels.
+	  There you will find a sub-capter on the single-slope PWM we will be using.
+	*/
+	
+	//First, enable the timer
+	
+	
+	//Set the mode of the timer to single slope PWM 
+	
+	
+	//We have to override the normal pin opperation so the PWM is pushed directly to the pin
+	//Hint: WO0 and WO1 are connected to leds. We need to override them to get the PWM out.
+	
+	
+	
+	/*Timer A is a 16 bit timer. This will give us a frequency of 25Hz, we can see it flicker.
+	  By lowering the period, (PER) we get higher frequency at the cost of lower resolution.
+	*/
+	
+	//Set the period to 12 bit. (This results in a frequency of ~400Hz.)
+	
+	
+	//We can now control the PWM duty cycle by simply writing values to the CMP0 and CMP1 registers.
+	TCA0.SINGLE.CMP0 = 0x0000; //Max brightness (Leds are inverted)
+	TCA0.SINGLE.CMP1 = 0x0fff; //Min brightness (Leds are inverted)
+	
+	
+    while(1){
+		
+		/*Have some fun with the leds. Examples:
+		  Have them fade between max and min
+		  Have them fade in a pattern (Heartbeat?) 
+		  Change the brightness based on buttons
+
+		*/
+		
+    }
+}
+