Dear all,
I am working on a project using STM32F750 (custom board), a 7 inch TFT touch LCD (using LTDC), and FreeRTOS v1.
I have 12 analog signals (ECG signals) captured by ADC every 1ms.
I want to plot them (real-time) on 12 different graphs on LCD.
My display refresh rate is usually about 60 Hz. However, when I add 12 dynamic Graph widgets to a screen and add data points in each tick, the refresh rate falls below 15 Hz!
I also tried to disable the ADC and just pass a constant data. But the problem still persists.
Here is what I tried yet:
1-Making a cacheable container and updating the cache -> No effect.
2-Changing the dynamic graph codes so it won't invalidate graph after each point and instead, defining a rectangle and invalidate a moving strip on screen using invalidateRect() -> Refresh rate increased a little bit. However screen flickers
3-Using setFrameRateCompensation(true) -> when I measure screen refresh rate it apparently become 60 Hz again, but when I see it in oscilloscope there are long delays between each several tick.
4-I tried using a custom graph widget instead of dynamic Graph -> problem persists.
I would be really glad if someone can help me to fix this issue.
