LCD TOUCH WITH PINCH ZOOM for marlin firmware hopefully

thingiverse

This code is for an LCD with a touch panel, specifically using the ILI9328 touch panel and compatible displays. To operate in SPI mode, refer to the provided schematic which uses a shift register. When lcdMode is set to 1, it's in SPI mode; pins q0 and q3 are used for touch input in this mode. The LCD using 2 pins is currently buggy but expected to improve soon when lcdMode is 0. Simply plug in the display, adjust the pinout accordingly, and run it in 8-bit mode. A video demonstrates the display with code and pinch zoom functionality, though it's still a work in progress. Check out this link for a time test: http://youtu.be/rLsRGStPWng. Time tests show that a full screen refresh takes 43ms, or approximately 24 times per second. Writing a single pixel takes 32-44us (depending on cache), writing 324 pixels in burst mode takes 2.8ms, and writing an alphanumeric character to the display varies by font size: largest - 18ms; smallest - 1.4ms. Converting an integer to a string using itoa takes approximately 60us. The touch sensitivity measures time at around ~600us (not yet programmed but can detect in as little as 10us).