Feature/24 different smart screen implementation in newer models #28
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The different model has quite a different protocol which meant that the original code didn't work. But the principle seems the same. The main differences are... * Command packets are 10 bytes long, framed by the command byte at either end. * Command bytes are 0xCA-0xCE. * A 'HELLO' command elicits a response from the device of 'HELLO' followed by 0x0A, 0x12, 0x00. Useful to identify the device format. * An 'orientation' packet allows the orientation of the next bitmap block to be selected from landscape and portrait (column major or row major). * The graphics data is still 565, BUT... high 3 bits of green are in b0-b2, low 3 bits of green are in b13-15, red is in b3-7, blue is in b8-12. * A 'lighting' packet lets you select the colours of the backlight LEDs with 8bit RGB values. * Amusingly the 'lighting' isn't supported by the software that the seller included in their listing - although they mention it, there's no way to set the colours in their software. * There is no Clear, Screen off, or Screen on packet (as far as I can tell). The device has a serial number of '2017-2-25' - so whilst this appears to be newer, the year implies that it was created longer ago? These changes are just to make things work, with my own comments and debug to show what I found.
Implementation of the protocol in the different model of smart screen.
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