display update frequency

[mdalal]

Hi,

I am learning TouchGFX and I have gone through all the study materila from the TOuchGFX academy.

I am having a BW monochrome display on the SPI channel. And the display need not have to get updated unless there is a change in frame as the display itself has inbuilt RAM to store the framebuffer content. 

The question I have is, where the TouchGFX setting is to update the display in such case only when the framebuffer is change rather than updating the diplay on every tick (FPS)?

[Mohammad MORADI ESFAHANIASL]

Hello @mdalal,

For SPI displays, the procedure of handling the communication between TouchGFX and display is a bit different than LTDC. Please follow the documentations below to get an overview on how SPI displays are handled:

SPI Display Configuration 

TouchGFX Generator Display 

SPI and FMC Display Interface 

I hope this helps you!
If you have more questions, don't hesitate to ask!

[Tesla DeLorean]

Failing an alert, CRC the frame buffer, to determine changes without holding a secondary copy.

You could also do regions of the frame too. If you have space you can keep a host side copy, and determine how many lines are impacted, or reduce to a region.

Some OS do track the scope/dimension of the changes to the frame buffer.

[mdalal]

Hi,

Thanks for the references. However, I still do not get a clear idea on how to set the frequency of the update.