I tried to make a pcb board like that using the same ic and the same circuit, only the usb port cannot be used like that board.
after I searched, it turned out that it requires using a special bootloader. can anyone help me what bootloaders I should prepare, and what tools I should use
thank you
It doesn't LOOK like an ATmega8...
To have an ATmega8 talk directly to USB, you need a software bit-banged implementation of low-speed USB, like VUSB, which isn't really a "bootloader."
Note that this (almost) implements USB 1.1, and has been found not to properly interoperate with some newer PC-side USB controllers.
Please do not modify a post after you got a reply to it. It might make the person who replies look like an idiot.
Never do that again.
I tried to make a pcb board like that using the same ic and the same circuit, only the usb port cannot be used like that board.
after I searched, it turned out that it requires using a special bootloader. can anyone help me what bootloaders I should prepare, and what tools I should use
thank you
Your two or more topics on the same or similar subject have been merged.
Please do not duplicate your questions as doing so wastes the time and effort of the volunteers trying to help you as they are then answering the same thing in different places.
Please create one topic only for your question and choose the forum category carefully. If you have multiple questions about the same project then please ask your questions in the one topic as the answers to one question provide useful context for the others, and also you won’t have to keep explaining your project repeatedly.
Repeated duplicate posting could result in a temporary or permanent ban from the forum.
Could you take a few moments to Learn How To Use The Forum
It will help you get the best out of the forum in the future.
Thank you.
There are many variations of this board, going back over the years. Some use a PIC controller. Some have a CH340, others FTDI device. I haven't found a schematic for any of them. Some are using HID, I guess the CH340 ones are using USB serial.
But without a spec for the specific board in question, we can only speculate.
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