C programs for avr microcontroller

Simple stuff like setting and clearing bits is important to any project you do. It is often required to set, clear, toggle and check bit status of a Register without affecting any other bits. Also it is important to do in a way that is compiler independent and code can be ported without modifications. As you know we need to set or clear bits in order to make the corresponding pin output or input respectively. Let's set the bit 4 to make the port pin as output. There is no direct bit set or clear instruction in 'C' that we can call to do this.

It is important to note that even if the value of DDRD was different, only bit 4 would have been set with the operation above without affecting other bits. Go to Project — Configuration Options menu, and on first screen check these points: Check Device matches your device. For output for programmers as well, check Create Hex File as this is the file for programmers.

We have some C code example projects on our support pages. Log in to Reply. The idea is to make the code a little more readable over using a bitwise left shift. Which method you choose is entirely up to you.

You will see both in wide use and should be comfortable seeing either. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. Skip to content. In this post we will explore some of the key concepts of C programming for AVR microcontrollers. AVR Registers A register is a special storage space in which the state of the bits in the register have some special meaning to the AVR microcontroller.

Figure 2 — Bitwise AND operation. Figure 3 — Bitwise OR operation. Figure 4 — Bitwise XOR operation. Figure 5 — Bitwise NOT operation. Figure 6 — Bitwise shift operation. Figure 7 — Bit value mask. Share this:. Like this: Like Loading Posted in AVR Tutorials. Leave a Reply Cancel reply Enter your comment here Fill in your details below or click an icon to log in:.