Move from Arduino software to Win. AVR with Programmers Notepad « inside. Gadgets. So the Arduino software has been easy to use but I’m thinking about using V- USB in one of my projects. V- USB is an implementation of the USB protocol that can run on an Atmel AVR microcontroller but in order to integrate it into one of my projects it’s time to move away from the Arduino software. I’ll show you how we can create our own version of the ATtiny. Blink without the Arduino software. We will use setup/timer functions from the internal Arduino wiring. First thing we’ll do is download Win. AVR from http: //winavr. After installation, the default directory is C: \Win. AVR- 2. 01. 00. 11. But before we start with Win. AVR we need a starting template, so what I did was download AVR Studio 5 Beta and start a new blank project. The reason I’m using Programmers Notepad instead of AVR Studio is that it’s a very simple interface and from my testing actually compresses things better when compiling. Now we’ll open up Programmers Notepad (referred to as PN) from Start - > All Programs - > Win. AVR- 2. 01. 00. 11. Programmers Notepad . Make sure the directories in between don’t have spaces in them, e. C: \my projects\ATtiny. The main function is the first function that is executed so it’s the place where we need to do our setup routine and then all our work will be done in the while loop. Save the main. c file in the directory we created our project in (C: \Projects\ATtiny. Right click on the project name and select Add Magic Folder then choose the folder where the project is at. Now all the files are shown. Create the Makefile to compile your project. So it’s all good that we have some code but we have to be able to compile our code into a . ATtiny. 85 with; this is where the makefile comes in. It’s basically a file that has rules which assembles all of our code together with. Luckily for us there is actually a template Makefile that comes with Win. AVR which is located at C: \Win. AVR- 2. 01. 00. 11. Using WinAVR - Writing the first program Let us assume that you have installed WinAVR-20090213 (2009 version) on your C. Please create separate folders for each program you write for eg. Go ahead and copy that to your project directory. Now open up the Makefile in PN as we need to make some slight modifications. You will have to refresh the directory in PN to see it.# MCU name. MCU = attiny. 85. First thing we need to do is change the MCU to the attiny. F. Define just says that if the compiler sees any references to F. It does this by looking at the clock cycles, a 1. MHz clock cycle is 1,0. How To Write Program In Winavr GccMHz is 5. 00ns. The delay function takes this and calculates how many clock cycles it would need to wait for x amount of time. This is to say that if your microcontroller was running at 2. MHz but your F. Just something to keep note of if you ever need to change your microcontrollers speed whilst it’s running. If you are using the Arduino as the ISP like I am, you change it to stk. Use lpt. 1 to connect to parallel port. I actually had another instance of PN which I used fro something else so to keep them separate I change the location of these files to point directly to the Win. AVR folder instead of looking at the Windows PATH environment. It’s very likely that you won’t have to do anything here. View the complete Makefile here: Makefile. Setup functions. Now we’ll create a setup. Sbi turns on a bit and cbi turns that bit off which are useful when accessing the microcontrollers registers.#ifndef boolean. What we do is if any of our code mentions either, we define the type as a uint.
I haven’t listed all of the code we have used but just note that all this code is needed if you call millis() and it’s another way for us to use the timers instead of just using delay. You can have it divide the clock by 1, 8, 6. We are using an 8 bit timer so when the timer reaches 2. How To Develop a Project for the AVR Microcontroller. Accessing AVR microcontroller ports with WinAVR GCC; Navigation. Accessing AVR microcontroller ports with WinAVR GCC. For instance if we want to set all pins of PORTD as output we simply write: DDRD. Move from Arduino software to WinAVR with Programmers Notepad. 13 Responses to “Move from Arduino software to WinAVR with Programmers Notepad. Every time it overflows we can stick an interrupt to catch the event and to increment a variable which we can then use to calculate how many milliseconds have passed. For us it’s not a concern as we will just be blinking an LED every second. If it was a concern you can set the prescaler to 1 which would give you 0. MHz / 1. 00. 0 = 0. Used from Arduino wiring. ATtiny. void setup(void) . First we turn on the interrupts./* dumpt everything, and only added the 2 timers the attiny has */. ATmega. 16. 8, timer 0 is also used for fast hardware pwm. PWM would mean that timer 0 overflowed half as often. ATmega. 8 and ATmega. TCCR0. A, WGM0. 1). TCCR0. A, WGM0. 0). TCCR0. B, CS0. 1). TCCR0. B, CS0. 0). TIMSK, TOIE0); Next they configure the timer registers. WGM0. 1 and WGM0. CS0. 1 and CS0. 0 set the prescaler to 6. MHz (with a 1. 6 MHz clock) at 5. TCCR1, CS1. 2); // Inside Gadgets fix. TCCR1, CS1. 1). sbi(TCCR1, CS1. TCCR1, PWM1. A); Next they turn on timer. PWM, this isn’t needed for our example but we’ll leave it in anyway. CS1. 2, CS1. 1, CS1. MHz / 1. 28 = 1. 25 KHz, inside the desired 5. KHz range. If you were at 2. MHz you should keep an eye on this because you would be at 2. KHz and lastly they turn on the ADC. This isn’t needed once again but I will leave it is so it’s ready to be used if you need it. The setup. c file is now done but we need to make a reference to it from the main. Next we go into the while loop and use PORTB to turn on our LED, use . We assign a variable with the current milliseconds, turn on the LED and use a while loop to check when millis() is greater than 1 second more than the value we stored in our variable. While it’s not as simple as using the Arduino software eventually you will get used to it. By switching to Win. AVR directly most of the time you should see a slight reduction in the size of your compiled code and now be able to distribute your entire code without the need of the end user needing the Arduino software. Move from Arduino software to Win. AVR with Programmers Notepad. So the Arduino software has been easy to use but I’m thinking about using V- USB which is an implementation of USB that can run on an Atmel AVR microcontroller so in order to integrate it into one of my projects it’s time to move away from the Arduino software. I’ll show you how we can create our own version of the ATtiny. Blink without the Arduino software however we will use setup/timer functions from the internal Arduino wiring. First thing we’ll do is download Win. AVR from http: //winavr. After installation, the default directory is C: \Win. AVR- 2. 01. 00. 11. The reason I’m using Programmers Notepad instead of AVR Studio is that it’s a very simple interface and from my testing actually compresses things better when compiling. Now we’ll open up Programmers Notepad (referred to as PN) from Start - > All Programs - > Win. AVR- 2. 01. 00. 11. Programmers Notepad . Make sure the directories in between don’t have spaces in them, e. C: \my projects\ATtiny. The main function is the first function that is executed so it’s the place where we need to do our setup routine and then all our work will be done in the while loop. Save the main. c file in the directory we created our project in (C: \Projects\ATtiny. Right click on the project name and select Add Magic Folder then choose the folder where the project is at. Now all the files are shown. Create the Makefile to compile your project. So it’s all good that we have some code but we have to be able to compile our code into a . ATtiny. 85 with, this is where the makefile comes in. It’s basically a file that has rules which assembles all of our code together with. Luckly for us there is actually a template Makefile that comes with Win. AVR which is located at C: \Win. AVR- 2. 01. 00. 11. Go ahead and copy that to your project directory. Now open up the Makefile in PN as we need to make some slight modifications. You will have to refresh the directory in PN to see it.# MCU. First thing we need to do is change the MCU to the attiny. F. Define just says that if the compiler sees any references to F. It does this by looking at the clock cycles, a 1. MHz clock cycle is 1,0. MHz is 5. 00ns. The delay function takes this and calculates how many clock cycles it would need to wait for x amount of time. This is to say that if your microcontroller was running at 2. MHz but your F. If you are using the Arduino as the ISP like I am, you change it to stk. Use lpt. 1 to connect to parallel port. It’s very likely that you won’t have to do anything here. Setup file functions. Now we’ll create a setup. What we do is if any of our code mentions either, we define the type as a uint. I haven’t listed all of the code we have used but just note that all this code is needed if you call millis() and it’s another way for us to use the timers instead of just using delay. You can have it divide the clock by 1, 8, 6. We are using an 8 bit timer so when the timer reaches 2. Every time it overflows we can stick an interrupt to catch the event and to increment another counter which we can then use to calculate how many milliseconds have passed. There is a PDF from Atmel which explains it all in detail. For example, we set the prescaler to 6. MHz we can find out how many milliseconds will pass until an overflow happens. MHz / 1. 00. 0 = 1. This means that if we were counting the milliseconds, it would only ever increment by 1. LED every second. If it was a concern you can set the prescaler to 1 which would give you 0. MHz / 1. 00. 0 = 0. Used from Arduino wiring. ATtinyvoid setup(void) . If you were at 2. MHz you should keep an eye on this because you would be at 2. KHz and lastly they turn on the ADC. This isn’t needed once again but I will leave it is so it’s ready to be used if you need it. The setup. c file is now done but we need to make a reference to it from the main.
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