kopia lustrzana https://github.com/pimoroni/pimoroni-pico
261d2732f0
The ST7789's Tscycw (time between serial write clock cycles) is 16 ns. This can be found on page 44 of the datasheet I'm using: https://www.waveshare.com/w/upload/a/ae/ST7789_Datasheet.pdf (I do not know which manufacturer Pimoroni products use and if their parts might be different. But it seems like this wouldn't change.) The existing code sets the SPI baud to 16 * 1000 * 1000. But baud is Hz, not seconds. That 16 * 1000 * 1000 doesn't represent 16 ns. It represents 16,000,000 Hz. 16 ns * (1 Hz / s) = 62,500,000 Hz. This commit changes the baud from 16 * 1000 * 1000 to 62'500'000, representing ~4x speed improvement in SPI and thus ~4x frame rate improvement, since the display's frame rate is currently SPI-limited. A before & after video can be seen here: https://www.youtube.com/watch?v=n2y19TCnATo Note that also on page 44 of that datasheet Tscycr (the read speed) is only 150 ns, not 16 ns. Right now, the Pimoroni code doesn't read any values back from the ST7789 so it is safe to operate at the higher speed. Also note that the 16 * 1000 * 1000 is the requested baud. The actual baud is the closest the Pico can get, which is 15,625,000. The new requested baud of 62'500'000 results in an exact match. |
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| .. | ||
| CMakeLists.txt | ||
| st7789.cmake | ||
| st7789.cpp | ||
| st7789.hpp | ||