Week 9
Embedded Programing
Objectives
Individual Assignment
Group Assignment
Learning Outcomes
Individual Assignment
ATtiny 44
GND : Ground
Port B (PB3...PB0) : Port B is a 4-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). As inputs, Port B pins that are externally pulled low will source current if the pull-up resistors are activated.so we don't need to add a pull-up resistor externaly for button's and other purpose.
RESET : Reset input. A low level on this pin for longer than the minimum pulse length will generate a reset, even if the clock is not running.a reset will just reset the programm that currently runnig .
Port A (PA7...PA0) : Port A is a 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). As inputs, Port A pins that are externally pulled low will source current if the pull-up resistors are activated.
SCK(Serial Clock) : Programming clock, generated by the In-System Programmer (Master).
MOSI (Master Out - Slave In) : Communication line from In-System Programmer (Master) to target AVR being programmed (Slave).
MISO (Master In - Slave Out) : Communication line from target AVR (Slave) to In- System Programmer (Master).
Programming using Adruino
#define LED 8
#define SW 7
void setup()
{
pinMode(LED, OUTPUT);
pinMode(SW, INPUT);
}
void loop()
{
digitalWrite(LED, HIGH);
delay(1000);
digitalWrite(LED, LOW);
delay(1000);
}
#define LED 8
#define SW 7
void setup()
{
pinMode(LED, OUTPUT);
pinMode(SW, INPUT_PULLUP);
}
void loop()
{
if(gigitalRead(SW_==0)
{
digitalWrite(LED, HIGH);
}
else
{
digitalWrite(LED, LOW);
}
}
Programming using Atmel Studio
Additionally, Studio includes Atmel Gallery, an online app store that allows you to extend your development environment with plug-ins developed by Microchip as well as third-party tool and embedded software vendors. Studio 7 can also seamlessly import your Arduino sketches as C++ projects, providing a simple transition path from Makerspace to Marketplace.
DDRx is an 8-bit register which stores configuration information for the pins of Portx. Writing a 1 in the pin location in the DDRx makes the physical pin of that port an output pin and writing a 0 makes that pin an input pin.
Note: Each physical pin of a port is configured independently and thus a port can have some of its pins configured as input an the others as output pins.
PINx is an 8-bit register that stores the logic value, the current state, of the physical pins on Portx. So to read the values on the pins of Portx, you read the values that are in its PIN register.
PORTx is an 8-bit register which stores the logic values that currently being outputted on the physical pins of Portx if the pins are configured as output pins. So to write values to a port, you write the values to the PORT register of that port.
Fill the spaces as shown below.
Title:-
Command:-
Arguments:-
Benchmark Test
1) Arduino
void setup()
{
pinMode(PA1,OUTPUT);
}
void loop()
{
digitalWrite(PA1,HIGH);
digitalWrite(PA1,LOW);
}
2) GCC C
#define F_CPU 20000000UL
#include
int main(void)
{
DDRA |= (1<<1);
while(1)
{
PORTA |=(1<<1);
PORTA &=~(1<<1);
}
}
3) Assembly
.org 0
sbi DDRA,1
main:
sbi PORTA,1
cbi PORTA,1
RJMP main
