![]() I still need to do a bit more reading to fully understand DDR registers. For example, the first bit (bit 0) of DDRB will determine if PB0 is an input or output, while the last bit (bit 7) will determine if PB7 is an input or output. The DDR register is 8 bits long and each bit corresponds to a pin on that I/O port. This is created by configuring pin 13 as output pin using the into_output method of the d13 pin and passing in a mutable reference to our ddr register.ĭDR register determines if pins on a specific port are inputs or outputs. We then define a variable led that will hold the pin number that the LED is connected to. We then create a new Pin instance passing in the ports from the peripheral instance peripherals. Peripherals are devices that bridge the communication with your chip/cpu with external devices, sensors etc.Įxamples of peripherals would be your timers, counters, serial port etc.Īn embedded processor interacts with a peripheral device through a set of control and status registers. There's a lot going on in the code above!įirst, we create an instance of Peripheral which is a list of all peripherals in Uno. We need access to the pin in our code in order to manipulate the LED, i.e., set it high or low. If you look at the Uno, we have the digital Pin 13 which is connected to the built-in LED. The details are explained better here: Port Manipulation In case of ATmega328P, we have three port registers to work with: These ports are controlled by port registers, which can be thought of as a special byte variable that we can change in our code. Some of them are categorized as I/O ports.Ī port is a group of pins representing a standard interface. Most microcontrollers, if not all, contain pins that allow the device to both read and write digital values to external circuits. In the diagram above, you can notice various pins on the microcontroller. ![]() Let's take a look at the pin diagram of the ATmega328P chip on Uno: To blink the LED, we only need a few lines of code and set the relevant pin high or low. The never type which denotes that the function never returns. ![]() Then we have our main function annotated with the entry attribute macro from the arduino_uno crate. Setting up our projectįirst, we'll create a new cargo project by running:Įnter fullscreen mode Exit fullscreen mode It's a very simple exercise, but there's a lot to learn as a beginner. We'll do the hello world of arduino which is blinking an LED. With that brief history aside, let's get into it! If you wanna read more about that, head over here: AVR-Rust book AVR is a family of micro-controllers developed since 1996 by Atmel, which was later acquired by Microchip technology. The Arduino Uno is based on the ATmega328P, which is an 8 bit microcontroller falling under the family AVR. We'll take a whirlwind tour on how to run Rust on the Arduino Uno, which is probably the most widely known and used development board in the hobbyist embedded domain. The code in the post is compiled on a Linux machine (Arch linux) with Rust compiler version: rustc 1.47.0-nightly (22ee68dc5 ). Once you have gone through this post, you may wanna go through the through the basics on embedded rust book. Target audience: This post is written with beginner to intermediate folks in mind who want a head start with embedded systems in Rust with Arduino. Kicking off the series with this first post. This is probably going to be a series of blog posts on my adventures with Rust on Arduino and maybe ESP8266 and discovery F3 in future. I have always been fascinated with the idea of using code to manipulate and affect physical objects. cargo/config.toml for your target ( avr-unknown-unknown). This means that you can now compile Rust programs for the avr microcontroller board by just running cargo +nightly build, providing a. At the time of writing this, about a month ago, the rust-avr fork was merged upstream.
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