(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
