Smooth video playback on STM32 and ST7735

Parts: cheap bluepill STM32 160x128 ST7735 LCD SD card Comments: SD uses faster STM32 SPI1 interface which supports 36 Mbps Not all SD cards work at 36MBps Slow card at 18Mbps gives 2223fps Fast card at 18Mbps gives 2526fps Fast card at 36Mbps gives 3334fps SdFat library uses DMA mode for SPI transfer Big buffer in RAM is used to speed up SPI, DMA transfer from SD SPI1 is shared between LCD and SD card Demo videos used here are taken from my older video and are n