Category: C

Now that you have timer interrupts working, lets get to work making them more useful. STK500 Setup For this example, make sure that you have your PORTA jumpered to LEDs, as was discussed in our Port Output guide. You will also want to have the second serial port called RS232 SPARE connected to your computer, and a terminal program listening […]

In this guide we create a few serial functions that are very helpful in dealing with the USART on an AVR microprocessor. If you’ve been following along in these guides, then your STK500 should be setup like this. We need to add a couple of additional things if we are going to do serial port communications. The cables from PORTA […]

We’ll walk you through some simple steps to get accurate delay functions in an AVR in C. STK500 Setup Make sure that you have your PORTA jumpered to LEDs, as was discussed in our Port Output guide. The Delay Header In order to use the built in delay features in WinAVR you need to include the delay header like this: […]

Let’s figure out how to read port input data on an AVR processor using C. Connect PortB To Switches Remember how we connected PORTA to the LEDS? Now we are going to connect PORTB to the SWITCHES. Just be sure that you connect pin 1 of PORTB also known as PB0 toSW0 by orienting the cable so that the red […]

C defines a special operation for dealing with bits, and it is represented by two less than symbols in a row << or two greater than symbols in a row >>. This is called a bit shift. The value on the left side of the << is shifted a number times equal to the value on the right hand side […]

Make sure that you have the STK500 user guide on hand. It describes in detail all of the steps that we will describe here. You can find a copy of it on the Atmel website, direct link ishere. Since the ATMega32 gets socketed in A3 on the STK500, an A3 is a pink colored socket, this means that you must […]

The AVR series of microcontrollers reference their I/O ports as PORTA, PORTB, PORTC, PORTD and so on. Each port has up to 8 bits, each of which can be configured as either an input or an output. For instance, you can configure the first 4 bits of PORTA to be used as inputs, and the upper 4 bits of PORTA […]