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Convert ASCII into Morse code on the Tang Nano using the UART interface

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Tang Nano - Morse Encoder

Generate a single bit Morse code output using a UART interface. When a complete 8-bit digit is received, the digit is encoded as Morse code and transmitted.

The resources linked at the bottom of this page contain great information on setting up the UART connection. I needed to reflash the CH3552T chip on my board as described in the first link.

Synthesis

This project can be synthesized using GowinSynthesis in the Gowin IDE (Under Project > Configuration > Synthesize > General). Other tools may work. Also in the configuration menu, DONE and RECONFIG_N must be configured as Dual-Purpose Pins to use the UART interface.

Usage

Once flashed (e.g. with the Gowin programmer or openFPGALoader), you can send characters via the Nano's second RS232 serial port. On Linux, that would likely be /dev/ttyUSB1 (ttyUSB0 is used for programming).

The program will store all received characters in a small FIFO buffer. When a character starts being transmitted (the onboard LED should flash the Morse code sequence), the character is also transmitted back to the connected device via the serial port.

To send data to you device, you can use any program capable of serial communication.

Screen

$ screen /dev/ttyUSB1 9600

To exit screen, use ctrl + A, then \, followed by y to confirm.

Platform IO monitor (via CLI)

$ pio device monitor -p /dev/ttyUSB1 -b 9600

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