Keil Logo

Serial Window

The Serial window accepts serial input and output data streams. The window displays serial output data received from a simulated CPU, while characters typed into a serial window are input to the simulated CPU. This allows testing a UART interface prior to having the target hardware.

The Debug (printf) Viewer is a special serial window that can exchange data with the microcontoller.

Serial Window ButtonOpen these windows using the toolbar button or the menu View - Serial Windows.

Serial Window Display

The Context Menu allows you to:

  • Clear the window.
  • Copy and save the content to the clipboard or a file.
  • Set a Carriage Return to every Line Feed that is received (enabled by default).
  • Switch to various representation modes.
    Terminal Mode Text formatting and cursor control sequences are supported (see table below).
    ASCII Mode Every printable character is displayed. An unprintable character is displayed as white-space (' ').
    HEX Mode Every character is displayed as a HEX-number.
    Mixed Mode Every character is displayed as a HEX-number and ASCII character. An unprintable character is displayed as dot ('.').

ANSI VT100 Terminal Sequences

Sequence Description
  From Target −→ µVision
CR ('\r') Carriage Return
LF ('\n') Line Feed
TAB ('\t') Tabulator
BS (0x08) Back Space
BEL (0x07) Bell
<ESC>[C Move cursor (position) 1 to the right
<ESC>[D Move cursor (position) 1 to the left
<ESC>[K Delete line right to cursor
<ESC>[J Clear screen
<ESC>[y;xf Set cursor to Row y, Column x; (x,y) are numeric ASCII values
  From µVision ⇒ Target
<ESC>[A Cursor Key UP
<ESC>[B Cursor Key DOWN
<ESC>[C Cursor Key RIGHT
<ESC>[D Cursor Key LEFT


// Clear screen and set cursor home
void ClearScreen(void)
        printf("%c[1;1f%c[J", 27, 27);

// set cursor to position (x, y)
void SetCursorPosition(int x, int y)
        printf("%c[%i;%if", 27, (signed int)y, (signed int)x);

See also

  Arm logo
Important information

This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies.

Change Settings

Privacy Policy Update

Arm’s Privacy Policy has been updated. By continuing to use our site, you consent to Arm’s Privacy Policy. Please review our Privacy Policy to learn more about our collection, use and transfers
of your data.