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Where is the official source code for Arduino-like microcontrollers?
I need a detailed source code for an arduino-like microcontroller. I have been looking for it, and I can't find one. I can find the specifications but not the code. I am using Wireshark to capture packets and I can see the messages that indicate the commands, but I can't see what is actually running the commands in code. I can't find the source code. If I had a USB debugger like JTAG, I could have my function and I could verify it is correct, but the microcontroller I need to use does not have a debugger.
Where can I find the source code?
The GNU tools can generate the native code from assembly, given the right switches. The GNU source code for an AVR microcontroller is at For the arduino line, the source is at
It would be better to use a specific toolchain, e.g. openWRT or busybox.org. These are Linux-based distributions with the toolchain and tools all built and installed by the package maintainer. It also has a support forum, so you can ask the users what's needed. It may also be helpful to use a Linux distribution as a virtual machine on your PC or Mac, or on a real PC if you have the required hardware.
Arduino is just a bootloader that initialises a very tiny Atmel AVR microcontroller. If you want to use a small bootloader (for size reasons) then I think ICR1 in the AVR instruction set is what you are looking for. See at the datasheet (page 36).
If you want to boot from an SD card, use the same bootloader but save the configuration data to an SD card.