At TouchGfx documentation, chapter "TouchGfx on Low Cost Hardware", It's specified an SPI connection of 32MHz between STM32G0 uC and ILI9341V display controller. I cannot find in ILI9341V datasheet how to achieve that speed in SPI modes of the contro

[IVill.1]

Datasheet specify a minimun serail clock for writing of 100ns. For sure I'm missing something because you have examples availables. Can you help in regards ?

[Peter BENSCH]

Well, the data sheet of the ILI9341V actually specifies a minimum clock period of 100ns, which corresponds to a maximum of 10MHz. We have found the device runs much faster, so 32MHz has been choosen.

Of course, you have the option to be conservative i.e. stay within the limits of the datasheet values and run SPI at 10MHz only.

When your question is answered, please close this topic by choosing Select as Best.

/Peter

[IVill.1]

Thanks for answering at first.

Based on your answer, I have an additional question,

have you tested or can you foresee the behaviour of the demo when slowering communication between uC and display ?

What kind of limitations could be found ? (always regarding to your demo)

[Peter BENSCH]

No, I haven't tested it yet, but I expect some slow down of the demo.

Limitations in comparison to what?

[IVill.1]

Without having got into deeper detail in Touchgfx libraries functionality, I'd expect limitations in terms of synchronization between SPI Flash reading and display refreshing rate, also impacting the capability of applying some effects on the image before sending it to display.

Anyway. I'm just evaluating the package for this kind of low cost solutions and I suppose I'll be able to later identify the bottlenecks, that are mostly application dependent.

Many thanks,

Ignasi Villagrasa