Performance of TFT Board 4 on Fusion for STM32 v8

[sebastian.kraemer]

Hi,
I'm trying to get some rough numbers about how much time is needed to render on the connected touch screen.

HW:

• Fusion for STM32 v8
• STM32F407ZGT MCU card
• TFT Board 4 Capacitive

SW:

• mikroSDK
• setup with Necto Designer

I measured the time it takes for vtft_process by reading a timer value before and afterwards. I get the following numbers:

• refresh whole screen: 217ms
• press "small" button: 5ms
• press "big" button: 10ms

Questions:

• Do these results agree with your experiences or am I measuring something incorrectly?
• The time it takes seems to be directly proportional to the number of written pixels - is the limiting factor the Intel8080 interface between MCU and TFT? Can this somehow be optimized by not using the MCU to driving the communication but using e.g. the FSMC module?
• Is the rendering code optimized for different platforms? E.g. on STM32 mcus with ChromeArt support does the vtft (or underlying) library make use of this hardware acceleration?

kind regards,
Sebastian