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  • The red hand on the watch faces in the pictures are second hands which the NRF52832 handles fine with barely noticeable flicker. The problem with faster than one second is that the flicker caused by unbuffered update becomes very obvious which is why you need buffering. I tried it on the ROCK and because it has the double buffered lcd_spi_unbuf and the faster 32MHz SPI it can manage about 150ms for a complete screen rewrite of 240x280 pixels.

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