WhyCan Forum(哇酷开发者社区)

大佬们，如何修改A40i背光输出极性

1.全志a40i接入usb摄像头，如果不动USB接口，图像显示都是正常的，但是稍微动一动usb接口后，就获取不到图像了，大佬们有没有遇到过这种情况的,怎么解决的？

利用全志a40i，接入usb摄像头,图像采集模式yuyv，利用的全志的de功能来显示，rgb液晶分辨率1024x600，全屏显示，在显示时，图像数据偶尔抖动一下，大佬们知道问题可能在哪？在此先谢谢大佬

下面是启动信息
[0]HELLO! BOOT0 is starting!
[2]boot0 commit : 80628dcde5dc4ecdc757a9e782c58d7cf1abf959

[60]dram size =64
[62]card no is 0
[63]sdcard 0 line count 4
[65][mmc]: mmc driver ver 2018-5-23 16:07:00
[69][mmc]: sdc0 spd mode error, 2
[78][mmc]: Wrong media type 0x00000000
[82][mmc]: ***Try SD card 0***
[99][mmc]: HSSDR52/SDR25 4 bit
[102][mmc]: 50000000 Hz
[104][mmc]: 30436 MB
[106][mmc]: ***SD/MMC 0 init OK!!!***
[177]Loading boot-pkg Succeed(index=0).
[189]Ready to disable icache.
[192]Jump to secend Boot.

U-Boot 2014.07 (Jul 31 2018 - 14:59:19) Allwinner Technology

uboot commit : 6604446f7bddb8fe53f2b993100929f92a5f4d6e

i2c_init: by cpux
[I2C-DEBUG]:i2c_set_clock() 354
[I2C-ERROR]:twi_send_clk_9pulse() 136 SDA is still Stuck Low, failed.
i2c_init ok
[0.241]pmbus:   ready
axp: get node[/soc/pmu0] error
axp_probe error
[0.247]PMU: cpux 408 Mhz,AXI=408 Mhz
PLL6=600 Mhz,AHB1=200 Mhz, APB1=100Mhz
key value = 4294967295, fel_key = [256,426]
DRAM:  64 MiB
Relocation Offset is: 03524000
axp: get node[/soc/pmu0] error
int sunxi_dma_init---
irq enable
workmode = 0,storage type = 1
[0.330]MMC:      0
SUNXI SD/MMC: 0
used mbr [0], count = 8
sunxi secure storage is not supported
[0.372]usb burn from boot
delay time 0
int sunxi_dma_init---
irq enable
sunxi_dma_install_int ok
[0.441]usb prepare ok
[1.243]overtime
sunxi dma exit
[1.277]do_burn_from_boot usb : no usb exist
logo addr = 0x83f00000
sunxi_read_bootlogo: read bootlogo partition successful
do not find fastboot status flag
--------fastboot partitions--------
-total partitions:8-
-name-        -start-       -size-     
bootlogo    : 400000        80000       
env         : 480000        40000       
boot        : 4c0000        600000     
rootfs      : ac0000        1900000     
rootfs_data : 23c0000       1900000     
misc        : 3cc0000       40000       
private     : 3d00000       40000       
UDISK       : 3d40000       0           
-----------------------------------
disable nand error: FDT_ERR_BADPATH
disable nand error: FDT_ERR_BADPATH
## error: update_fdt_dram_para : FDT_ERR_NOTFOUND
PowerBus = 0( 2:vBus 3:acBus other: not exist)
no battery exist
sunxi_bmp_logo_display
Hit any key to stop autoboot:  0
## Booting kernel from Legacy Image at 80007fc0 ...
   Image Name:   ARM OpenWrt Linux-3.10.65
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    2814408 Bytes = 2.7 MiB
   Load Address: 80008000
   Entry Point:  80008000
   XIP Kernel Image ... OK
   reserving fdt memory region: addr=81000000 size=10000
   Using Device Tree in place at 81000000, end 8100f0ff

Starting kernel ...