VT100 compatible color mode not cleared

[grymoire]

When you connect to the BP, and enable VT100 compatible color mode, the bottom of the screen displays the voltages on the pins.

When you type "#" of "$" (reset, or boot mode), the BP disconnects, yet the terminal is not cleared. The voltages stayed displayed on the screen, even when you execute commands that could cause the screen to scroll down. It is necessary to type "clear" to reset the terminal.

[henrygab]

It would probably be good to define as a function, such as void ResetTerminalOnExit() or similar. Possible items which might be output to reset the terminal (did DEC/ANSI not provide a shortcut method?) might include:

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Reset top/bottom margins

It appears that a scroll region is setup during initialization:

BusPirate5-firmware/ui/ui_term.c

Lines 126 to 127 in 5bbaed7

	// set scroll region
	printf("\e[%d;%dr", 1, system_config.terminal_ansi_rows - 4);

One site defines CSI #; # r as "set top/bottom margins". Documentation is sparse, but since default is to set to the viewport size, it's likely the sequence CSI ; r (omitting the numeric values) should reset to full size, regardless of terminal size.

As a C string, this would be: "\e[;r"?

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Set cursor to bottom of screen

If getting rid of scroll area, don't want next output to overwrite the status bar information, as the user may want that to persist in the scrollback buffer.

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Use other reset commands

CSI ? ###... l, where the ### can be one or more values to be reset:

###	Meaning
1	Normal Cursor Keys
2	Designate VT52 mode
3	80 Column Mode
6	Normal Cursor Mode
7	No Wraparound Mode
8	No Auto-repeat Keys
9	Don’t send Mouse X & Y on button press
12	Stop Blinking Cursor
25	Hide Cursor
45	No reverse wrap-around
47	Use Normal Screen Buffer
66	Numeric keypad
1000	Don’t send Mouse reports
1002	Don’t use Cell Motion Mouse Tracking
1003	Don’t use All Motion Mouse Tracking
1004	Don’t send FocusIn/FocusOut events
1005	Disable UTF-8 Mouse Mode
1006	Disable SGR Mouse Mode
1015	Disable urxvt Mouse Mode
1016	Disable SGR-Pixels Mouse Mode
1047	Use Normal Screen Buffer (clearing screen if in alt)
1048	Restore cursor as in DECRC
1049	Use Normal Screen Buffer and restore cursor
2004	Reset bracketed paste mode

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Output a single line

Output "\r\n" to force a single line scroll.

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[wyattearp]

It would probably be good to define as a function, such as void ResetTerminalOnExit() or similar. Possible items which might be output to reset the terminal (did DEC/ANSI not provide a shortcut method?) might include:

I'm going to second that it would be cool to have just a ResetTerminal() function. Numerous times I've wanted to type clear or reset and have it drop me back to the top of the screen like a standard bash prompt. This is also a present issue when entering / exiting the logic analyzer mode.

[wyattearp]

Looking at the statemachine in #100, this appears to be related as well. I think it's probably best if we could sketch out the statemachine's intended execution and then create an update to address that.