Using sprintf generates a large amount of code. By replacing the
sprintf calls with dedicated code, program size is reduced when
widgets are used.
Also:
- Added a getValLen method for widgets which returns the print
length for the current value, similar to the existing getMaxValLen.
- The value for widgets is now initialised to the minimum value,
instead of 0, because 0 could be outside the specified range.
- Added getValLen and getMaxValLen keywords.
- The MicroViewWidgetDemo example sketch was modified to use
the new getValLen method, plus a few other small changes.
The user can add a flag to the style, for all widgets, to supress
the display of the numeric value.
Added new widget method drawNumValue() to simplify the code,
which can also be called by the user, e.g. for a custom numeric
value location.
Widgets will now work properly with minimum and maximum values
from −32,768 to 32,767.
Also, place the numeric value field close to sliders
and horizontally centred in gauges.
(and fixed a few spelling errors in comments)
- Use fast pin change macros for RESET, SS and DC.
- Implement MVSPI.packetBegin() and MVSPI.packetEnd() to allow sending
multiple byte "packets" while SS remains enabled.
- Add 2 and 3 byte command() functions to send multiple command bytes in
one packet.
- Modify clear() and display() functions to send commands and data in
packets.
- Do the "wait for SPI transfer complete" just before sending the next
byte (plus after the last or only byte) in a packet, so code can be
executed while bytes are being sent.
- Disable SPI mode when not transmitting, so MOSI (and SCK) will go low.
- Keep DC low except when sending data bytes.
- Change MVSPI.transfer() to void since nothing can be received from
the display.
- added defines to map ports and bits for RESET, DC and SS.
- added macros to quickly control RESET, DC and SS using
the internal weak pullup for high.
Added WIDGETSTYLE2 (like 0, but vertical) and WIDGETSTYLE3 (like 1, but
vertical). NOTE: I don't have a build environment, so I can't even
promise this will compile! So if it's crap, just treat it as a concept
for an enhancement request!
* created MICROVIEWWIDGET class
* added routines to draw widget
* added slider widget
* merged MicroViewWidget into MicroView
* merged SPI.h into MicroView
