UART, escape key

Nick Vandehey

July 28, 2023 20:38

How do I send an escape key character over UART on the PLT?

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3 comments

Jeremy Wood

July 28, 2023 21:29
There are a couple of different ways to send control characters over UART.

One option: Send explicit bytes as a hex string:
```
# Send Escape character (ASCII 0x27)
- uartcmd: uart UART0
  send: hex "27"
```
The "hex" keyword allows you to send bytes from a hex string. (Note: this feature was added in PLT-OS 1.9.12, make sure your project is set to >= 1.9.12).

Another option: Use the appropriate escape sequence:
```
- uartcmd: uart UART0
  send: "\x27"
```
There are some limitations to what characters can be sent this way, but it works in most common cases, and it's useful when you want to intersperse plain text and control characters.
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Nick Vandehey

August 03, 2023 18:56
after trying, I couldn't make 27 work but 1B did
```
- uartcmd: uart UART0
  send: hex "1B"
```
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Jeremy Wood

August 03, 2023 19:29
My mistake, when I looked up the value for ESC, I didn't realize I found the decimal value, not hex. 0x1B is equal to 27 in decimal.
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