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- ASCII to USB keyboard protocol converter
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- This converts serial console terminal into USB keyboard, tested with TRS-80 model 100 TELCOM application.
- Target MCU is ATMega32u4 but other USB capable AVR will also work.
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- Hardware
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- Connect RX, TX and GND to UART pin of AVR. Note that you may need line drvier/level shfiter like MAX232 to interface high voltage of RS-232C.
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- Build Firmware
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- Configure UART setting and Just use 'make'
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- $ cd ascii_usb
- $ make
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- Then, load the binary to MCU with your favorite programmer.
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- Limitation
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- - This cannot see key up event, you cannot hold a key.
- - Alt, Gui(Win/Mac) modifier key are not available.
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- Scan code
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- ASCII code(0x01-7F)
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