Chip:RT1176DVMAA
Screen:480x640 MIPI interface.
I import the SDK(2.13.1) example:lvgl_guider_cm7 and only change the MIPI DSI seqence code according to my screen.PXP and VGLite are enabled.
`LV_USE_PERF_MONITOR` is enabled to see cpu usage,but the cpu usage is always 99% even there are only two lables and two buttons.
Two approaches are feasible to decrease the cpu usage:
(1)increase the interval that executes `lv_task_handler()` in the main loop
(2)set the compiler optimizing level to `-O3`,it decreases more.
And the cpu usage decreases from 99% to 27% in this simple screen.If there are more components,the cpu usage is still high.And I have to display the MIPI CSI camera stream to a canvas,and the cpu usage will be 99% again,which leads to unsmooth display.
I think the most likely cause of the issue is the double buffering.
`lv_disp_draw_buf_init(&disp_buf, s_frameBuffer[0], s_frameBuffer[1], 480*640);`
The `s_frameBuffer` need a memory of 480*640*2 bytes,I have to place it to SDRAM instead of internal SRAM,and external ram leads to high CPU usage.It seems the MIPI interface only support full-refresh mode instead of partial-refresh mode.So in this mode the buffer should be so big?
How can I address this issue?
