*Changed the SPI CS pin to work under automatic or manual control. This allows it to work when CS is controlled by SPI, or when it is controlled manually. We don't want it to fail in the configuration the Pimoroni python driver requires.
*Changed the wait() routine to use a 10ms debounce on WaitForEdge() as the python driver does.
*If the BUSY line is high on entry to wait to go directly to a timed wait as the python driver does.
*Fixed errors in the palette definitions. Removed extra memory allocation.
* Add support for Adafruit I2C/SPI Backpack
* Add support for PCF857x Backpacks
* Add support for conn/gpio/Group
* Implement conn/display/TextDisplay
* Add examples
* Cleanups
* Change backlight implementation
When the destination rectangle didn't start at (0,0) or cover the whole
display the Dev.Draw function would continue to update the display in
full. Obviously that didn't result in a good output.
This change updates the drawing logic to only update the affected area
(aligned to whole bytes on the horizontal axis) and limits the amount of
transferred data to the minimum needed to cover the destination
rectangle.
The calculation of the various offsets as well as the function sending
the image data are written to support unittesting.
Signed-off-by: Michael Hanselmann <public@hansmi.ch>
gsexton