the folloing URL is my previous question :
https://ask.embedded-wizard.de/1710/performance-depending-on-whether-arm-neon-function-enabled
In previous question, the last answer is LCD pixel clock adjustment.
So we modified the pixel clock as following ..
[root@(none) home]# fbset -i
mode "1280x800-64"
# D: 74.250 MHz, H: 52.660 kHz, V: 64.376 Hz
geometry 1280 800 1280 1600 32
timings 13468 68 60 8 8 2 2
rgba 8/16,8/8,8/0,8/24
endmode
Frame buffer device information:
Name : DISP3 BG
Address : 0x76700000
Size : 8192000
Type : PACKED PIXELS
Visual : TRUECOLOR
XPanStep : 1
YPanStep : 1
YWrapStep : 1
LineLength : 5120
Accelerator : No
1) First step :
In original graphic operation example, we change the screen size only. (800,480 -> 1280,800)
thereupon, It is only partially output on our LCD.
In this case, the frame rate was normally output to 60.
2) Second step
In original graphic operation example, we change all the components to fit the LCD size. (1280x800)
In this case, the frame rate was output to 30.
Why is not 60 frames at 1280x800 resolution?
3) Target system specification
- Embedded Wizard Studio Pro v8.30
- Embedded Wizard Platform Package for Generic RGBA8888
- Embedded Wizard Build Environment for Generic RGBA8888
- Generic RGBA8888 NEON AddOn
- NXP i.mx6 quad, 2GB RAM and 10.1 TFT LCD (1280x800)
4) Compile Flag
###############################################################################
# DEFINES
###############################################################################
CFLAGS = -O2 -Wall -pipe \
-marm \
-march=armv7-a \
-mcpu=cortex-a9 \
-mfloat-abi=hard \
-DEW_USE_OFFSCREEN_BUFFER \
-DEW_USE_DOUBLE_BUFFER \
-mfpu=neon
