Session 1 ported to ATmega4809 (b75291c7) · Commits · avrkurs / avrkurs

Session1-LF/Task1-LF.c

+7 −7

Original line number	Diff line number	Diff line
		@@ -15,7 +15,7 @@
		* F_CPU must be defined before including headers.
		*/

		#define F_CPU 3333333UL //The ATtiny4809 operates at 20MHz with a default scaling factor of 6: 20/6 = 3.333333MHz
		#define F_CPU 3333333UL //The ATmega4809 operates at 20MHz with a default scaling factor of 6: 20/6 = 3.333333MHz

		/**
		* System headers bellow
		@@ -26,13 +26,13 @@

		/**
		* Define helpers for pin bit positions.
		* The LED0 on the ATtiny4809 main board is connected to pin 4 on port D.
		* The LED0 on the ATmega4809 main board is connected to pin 5 on port F.
		* Check the datasheet to find out which pins on which ports the different LEDs and buttons are connected to.
		*/



		#define LED0 4 // LED 1 is connected to pin 4 on PORTD
		#define LED0 5 // LED 1 is connected to pin 5 on PORTF



		@@ -50,7 +50,7 @@ int main(void){
		* Toogle bit: FLAG ^= ( 1 << BIT_POS ) - using bitwise xor, toogles the bit at BIT_POS
		*/

		PORTD.DIR \|= (1 << LED0); // Set LED0 as output - Using "D" in PORTx.DIR since the LED is connected to port D on the microcontroller
		PORTF.DIR \|= (1 << LED0); // Set LED0 as output - Using "D" in PORTx.DIR since the LED is connected to port D on the microcontroller

		/*
		* The usual way to run microcontrollers is using a simple infinite loop
		@@ -58,9 +58,9 @@ int main(void){

		while (1)
		{
		PORTD.OUT ^= (1 << LED0); // Changes the state of LED0 by XOR-ing the last state. Check the XOR-table to find out how this works.
		// Non-compressed: PORTD.OUT = PORTD.OUT ^ (1 << LED0);
		//Can also refer to toogle register: PORTD.OUTTGL = (1 << LED0). IMPORTANT: only use equal sign here (=)
		PORTF.OUT ^= (1 << LED0); // Changes the state of LED0 by XOR-ing the last state. Check the XOR-table to find out how this works.
		// Non-compressed: PORTF.OUT = PORTF.OUT ^ (1 << LED0);
		//Can also refer to toogle register: PORTF.OUTTGL = (1 << LED0). IMPORTANT: only use equal sign here (=)
		_delay_ms(500);
		}
		}

Session1-LF/Task2-LF.c

+11 −11

Original line number	Diff line number	Diff line
		@@ -15,21 +15,21 @@
		#include <util/delay.h>

		/*
		* Check out the ATtiny4809 datasheet to find the correct ports and pins
		* Check out the ATmega4809 datasheet to find the correct ports and pins
		*/

		// LED
		#define LED0 4 //On port D
		#define LED0 5 //On port F

		// Button
		#define SW0 2 //On port C
		#define SW0 6 //On port C

		int main(void)
		{
		/*
		* We want to send signals to the LEDs, in order to turn it off and on.
		* We also want to be able to read the switches.
		* This is done by setting bits in the PORTx.DIR register (in this case PORTD.DIR and PORTC.DIR)
		* This is done by setting bits in the PORTx.DIR register (in this case PORTF.DIR and PORTF.DIR)
		* PORTx.DIR: 1 is output, 0 is input
		* LED: 1 LED is off, 0 LED is on
		* Button: 1 Button is open, 0 button is pressed
		@@ -41,7 +41,7 @@ int main(void)
		/**
		* In order to read from the switches, we need to give it a ground reference, via a pull-up resistor.
		* If we don't, the switch will have a floating ground, and hence its value will be undefined.
		* On the ATtiny4809, we enable pull-up by setting the "PORT_PULLUPEN" flag in "PORTx.PINnCTRL" high.
		* On the ATmega4809, we enable pull-up by setting the "PORT_PULLUPEN" flag in "PORTx.PINnCTRL" high.
		* See datasheet section 15 (I/O-ports).
		*/

		@@ -52,10 +52,10 @@ int main(void)
		* 3 - Enable pull-up on button SW0
		*/

		PORTD.DIR \|= (1 << LED0); // Set LED0 as output
		PORTC.DIR &= ~(1 << SW0); //Set SW0 as input
		PORTF.DIR \|= (1 << LED0); // Set LED0 as output
		PORTF.DIR &= ~(1 << SW0); //Set SW0 as input

		PORTB.PIN2CTRL \|= (1 << PORT_PULLUPEN_bp); //Enable pull-up on button SW0 (pin5)
		PORTF.PIN5CTRL \|= (1 << PORT_PULLUPEN_bp); //Enable pull-up on button SW0 (pin5)

		while (1)
		{
		@@ -77,12 +77,12 @@ int main(void)
		* 3 - if not, turn the LED off
		*/

		if(!(PORTC.IN & (1 << SW0))){ // If button is pressed (0 - LOW
		PORTD.OUT &= ~(1 << LED0); // Sets output to 0, turns LED0 on
		if(!(PORTF.IN & (1 << SW0))){ // If button is pressed (0 - LOW
		PORTF.OUT &= ~(1 << LED0); // Sets output to 0, turns LED0 on
		}

		else{
		PORTD.OUT \|= (1 << LED0); // Sets output to 1, turns LED off
		PORTF.OUT \|= (1 << LED0); // Sets output to 1, turns LED off
		}

		}

Session1-LF/Task3-LF.c

+13 −13

Original line number	Diff line number	Diff line
		@@ -12,10 +12,10 @@
		#include <stdbool.h>

		//LED
		#define LED0 4 //on port D
		#define LED0 5 //on port D

		//Button
		#define SW0 2 //on port C
		#define SW0 6 //on port C

		int main(void)
		{
		@@ -29,7 +29,7 @@ int main(void)
		* Set to 0: REG &= ~( 1 << BIT_POS )
		* This is called "read-modify-write".
		*
		* The ATtiny4809 also has special port registers that can do some of this for you.
		* The ATmega4809 also has special port registers that can do some of this for you.
		* Read what PORTx.DIRSET, .DIRCLR and .DIRTGL do to the PORTx.DIR register,
		* And similarly what PORTx.OUTSET, .OUTCLR and .OUTTGL do to PORTx.OUT
		* (HINT: see chapter 15.5 of the datasheet)
		@@ -40,16 +40,16 @@ int main(void)

		*/

		PORTD.DIRSET = (1 << LED0); // Set LED0 as output
		//Alt: PORTD.DIR \|= (1 << LED0);
		PORTF.DIRSET = (1 << LED0); // Set LED0 as output
		//Alt: PORTF.DIR \|= (1 << LED0);

		PORTD.OUTSET = (1 << LED0); // Set LED0 output high (turns off the led, since the led is active low)
		//Alt: PORTD.OUT \|= (1 << LED0);
		PORTF.OUTSET = (1 << LED0); // Set LED0 output high (turns off the led, since the led is active low)
		//Alt: PORTF.OUT \|= (1 << LED0);

		PORTC.DIRCLR = (1 << SW0); // Set SW0 as input (default)
		//Alt: PORTC.DIR &= ~(1 << SW0);
		PORTF.DIRCLR = (1 << SW0); // Set SW0 as input (default)
		//Alt: PORTF.DIR &= ~(1 << SW0);

		PORTC.PIN2CTRL \|= (1 << 3); // Enable pull-up on button SW
		PORTF.PIN2CTRL \|= (1 << 3); // Enable pull-up on button SW
		//eller bruk PORT_PULLUPEN_bp som er lik 3 (_bp = Bit Position)


		@@ -57,11 +57,11 @@ int main(void)

		while (1)
		{
		if(!(PORTC.IN & (1 << SW0))){
		if(!(PORTF.IN & (1 << SW0))){
		if(buttonState == 0){

		PORTD.OUTTGL = ( 1 << LED0);
		//Alt: PORTD.OUT ^= (1 << LED0);
		PORTF.OUTTGL = ( 1 << LED0);
		//Alt: PORTF.OUT ^= (1 << LED0);

		buttonState = 1;
		}

Session1-LF/Tasks_session1.txt

+4 −0

Original line number	Diff line number	Diff line
		---Session 1---



		Task 1:

		Learn how to open Atmel Studio.
		@@ -8,16 +9,19 @@ Read the code, what do you think it does?
		Learn how to upload code.



		Task 2:

		Set up a button with pullup. Use this to control the led.



		Task 3:

		Add aditional logic so that the button toggles the led.



		Task 4: (OPTIONAL)

		Add the OLED board.

Session1/Task1/.gitignore→Session1/Task1-blink/.gitignore

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