Arduino mega 2560 pins compared to r31/15/2024 ![]() What's the problem you're having with the ATmega16U2?Īs an alternative I'm also considering to select a more powerful board for my project. The 16U2 that is used on all my boards seems to be a quite poor quality chip. So it looks very good for an upload speed of 115200 with your clock speed. It says this: BAUD RATE CHECK: Desired: 115200, Real: 115181, UBRRL = 23, Difference=0.0% The Optiboot makefile actually runs a check of the upload baud rate versus CPU frequency and tells you what the error is. There is a different baud error at each baud rate and clock frequency. I'm not sure about the serial speed issue. If you're having troubles you could try changing to the full swing oscillator option.Īs for timing accuracy, that is certainly an issue with that clock speed. I don't have any experience with overclocking, but the default fuse settings of the Mega 2560 look OK. If you're feeling very cocky with your bootloader compiling skills now and want to go for extra credit by upgrading to the superior Optiboot bootloader (which only requires a 1 kB boot section instead of the 8 kB boot section of the STK500V2 bootloader, freeing up 7 kB of program memory), you can find the source code here: GitHub The compiled bootloader will be my_boards\avr\bootloaders\stk500v2\stk500boot_v2_mega2560.hex. Now wait for the compilation to finish successfully. So you only need to run this command from the Git Bash prompt: make mega2560 I see you have modified the mega2560 in the makefile. Now run this command from the Git Bash prompt to remove the previous compilation files from the folder: make clean The drive letter is specified like /c/ instead of C:\ and you can't use \ as a path separator. Note that paths work a little differently in Git Bash. If your Arduino IDE is installed somewhere else, you'll need to adjust it accordingly. The above command is for an installation of the Arduino IDE at C:\Program Files (x86)\Arduino. You do that by running a command from the Git Bash prompt that looks something like this: PATH="$:/c/Program Files (x86)/Arduino/hardware/tools/avr/bin" Luckily, that comes with the Arduino IDE so you only need to add its folder to the system path. In order to compile the bootloader, you need to use the avr-gcc compiler. Open the folder my_boards\avr\bootloaders\stk500v2 in Windows Explorer The easiest way to get them is via Git Bash, which you get by installing Git for Windows: Git - Downloading Package Since you're using Windows, the process is a bit more difficult, since some of the required tools are not installed with a stock Windows installation, as they are with Linux or macOS. Avrdude: can't open input file C:\Users.\Arduino\hardware\my_boards\avr/bootloaders/stk500v2/stk500boot_v2_mega2560_22Mhz.hex: No such file or directory
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