btashton opened a new pull request #591:
URL: https://github.com/apache/incubator-nuttx-apps/pull/591
## Summary
This provides an adaptor for using lvgl with the lcddev in addition to the
fbdev. As part of this it also fixes a compilation error when fbdev was used
with CONFIG_FB_UPDATE. There is also a monitoring callback enabled for
monitoring the performance of the demo.
## Impact
lvgldemo can now be used without requiring a framebuffer to be created.
## Testing
You can see the demo running on my keyboard feather using the lcddev here
(ignore the terrible refresh rate, that is due to the 8MHz SPI bus and DMA
limitations I am addressing):
```
NuttShell (NSH) NuttX-10.0.1
nsh> lvgldemo
VideoInfo:
fmt: 11
xres: 240
yres: 320
nplanes: 1
PlaneInfo (plane 0):
bpp: 16
tp_init: Opening /dev/input0
76800 px refreshed in 2250 ms
```
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