Scott Allen 499594d9de Help further reduce overdriving display inputs ...

(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.

2014-07-30 19:28:39 -04:00

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