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What do you need to know about the AVR bootloader?
Purdue University C. Introduction. The AVR Bootloader is a program that allows the programming or re-programming of the target AVR microcontroller using the PC serial port instead of a traditional programmer. Once the AVR Bootloader is programmed into the microcontroller, it remains until the chip is erased.
What is the purpose of a bootloader in a microcontroller?
The main purpose of a bootloader is: retrieve program from storage / network and load it. There can be a very limited amount of fast storage close to the processing unit, and the program that you want to run can be different from board to board or you may want to change the program on your board.
Why does a Microcontroller Flash its own memory?
Some form of a bootloader, to which an external device communicates, ultimately allowing the microcontroller to flash its own memory. Certainly there must be a very good reason to use a bootloader, else its current widespread use would be very odd. I just haven’t seemed to have fully grasped it yet. Is it that a programmer is expensive?
Where is the boot reset address on AVR?
As the boot section is at the end of the AVR device, we need to put an ORG directive at the end of our application code with the address set to the Boot Reset Address. Depending on the assembler, we may need to convert this address into bytes (x2).
Where do I put the bootloader in WinAVR?
The bootloader needs to be compiled with its start address set to Boot Reset Address in words. This is the same address as the assembler example. To do this in WinAVR, go to Configuration > Memory Settings tab, and click on Add button.
What can I do with AVR microcontrollers?
I’ve used AVR microcontrollers both for hobbies and work projects. These versatile microcontrollers ran the code I programmed them with, but once the final device was shipped, it was hard to change the firmware (the software running on the microcontroller): The user needed an ISP programmer and the software tools to update the firmware.