4 ms·
Between frames would be too rare for touch. You really do not want touch at just 45Hz. More samples are for averaging for smoothing. The touch controller here i
by dmitrygr 4y ago
Between frames would be too rare for touch. You really do not want touch at just 45Hz. More samples are for averaging for smoothing. The touch controller here is noisy and the board layout waveshare did … does not follow the data sheet recommendations for lowering noise.
Sd between refreshes is a poor idea for the reason you mention, yes.
And yes screen interface is run as fast as it can as per data sheet. Overclocking the MCU wont help as we are not cycle bound there. Overclocking the SPI bus will work but not far. Past 70MHz it gets glitchy.
- sgtnoodle 4y agoI specifically meant rapidly sampling the touch screen N times between frames rather than 1 time between frames. Depending on the characteristics of the EMI, it seems like that could work just as well.
- dmitrygr 4y agoBut in terms of temporal resolution you still have 45Hz which is too low for good inking.