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原创 [博客大赛]四层板搞定--AT91SAM9X35 第二版

 2013-7-3 14:54  4078 18 18 分类: MCU/ 嵌入式

花了一个月时间，又重新设计了一款AT91SAM9X35的板子。针对第一版做了以下改进。

1 200PIN1.27MM的双排插针换成了更可靠的BTB-80 插针

2 引出了所有地址线，数据线和其它IO

3 对布线进行了全面优化，保证板子运行更稳定。

4 更改一些价格比较高的芯片，换成低成本芯片。

花两天时间焊好板子，调试过程中的问题心得：

1 首先是串口收不到数据，开始以为是芯片问题，后来对比两版的原理图发现，此版取消了串口芯片的使能插座，导致CAN的芯片使能浮空，影响串口接收。用0欧电阻接地后一切OK.

2 DDR2芯片初始化失败，仔细查看电路，发现数据线排阻有两个管脚短路，去除后，DDR2稳定工作。

3 NANDFLASH 初始化导致SAM-BA死掉。重新排查排阻，解决短路虚焊后，问题解决。

刷入U-BOOT, 内核,Angstrom文件系统后，液晶屏显示完全OK，挂机三天整个系统稳定运行。

4 解决触摸屏触摸不准的问题，折腾两天后，原来是X使用了Xorg 引起的。拷贝光盘里自带的xorg.conf，再运行ts_calibrate 问题解决。

再次牢骚一句，要不是偶然看到GOOGLE上面搜出来的一段文字提醒了我，估计还得折腾几天，结果打开那篇文章却链接不上，最后让朋友通过翻墙软件才打开一睹全貌！在这个神奇的国度，难道非得翻墙吗？？

5 增加无线网卡支持。

root@at91sam9x5ek:~# vi /etc/wpa_supplicant.conf

增加：

network={

ssid="singlechip-home"

psk="××××××"

}

root@at91sam9x5ek:~# iwlist wlan0 scan

Cell 03 - Address: 38:83:45:AF:F9:3E

Channel:6

Frequency:2.437 GHz (Channel 6)

Quality=26/70 Signal level=-84 dBm

Encryption key:on

ESSID:"singlechip-home"

Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s

9 Mb/s; 12 Mb/s; 18 Mb/s

Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s

Mode:Master

Extra:tsf=0000000070463872

Extra: Last beacon: 450ms ago

IE: Unknown: 000F73696E676C65636869702D686F6D65

IE: Unknown: 010882848B960C121824

IE: Unknown: 030106

IE: Unknown: 0706555320010D14

IE: Unknown: 2A0100

IE: IEEE 802.11i/WPA2 Version 1

Group Cipher : CCMP

Pairwise Ciphers (1) : CCMP

Authentication Suites (1) : PSK

IE: Unknown: 32043048606C

IE: Unknown: 2D1A6E1003FF00000000000000000000000000000000000000000000

IE: Unknown: 331A6E1003FF00000000000000000000000000000000000000000000

IE: Unknown: 3D16060D0200000000000000000000000000000000000000

IE: Unknown: 3416060D0200000000000000000000000000000000000000

IE: Unknown: DD180050F2020101030003A4000027A4000042435E0062322F00

IE: Unknown: DD0900037F01010000FF7F

IE: Unknown: DD8A0050F204104A0001101044000102103B0001031047001000000000000010000000388345AFF93E1021000754502D4C494E4B1023000E544C2D57523734314E2F3734324E10240003312E3010420003312E301054000800060050F20400011011001D576972656C657373204E20526F757465722057523734314E2F3734324E100800020086103C000101

root@at91sam9x5ek:~# wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant.conf

root@at91sam9x5ek:~# ifconfig wlan0 192.168.1.3

root@at91sam9x5ek:~# route add default gw 192.168.1.1 dev wlan0

root@at91sam9x5ek:~# route

Kernel IP routing table

Destination Gateway Genmask Flags Metric Ref Use Iface

default 192.168.1.1 0.0.0.0 UG 0 0 0 wlan0

169.254.0.0 * 255.255.0.0 U 0 0 0 eth0

192.168.1.0 * 255.255.255.0 U 0 0 0 wlan0

root@at91sam9x5ek:~# ifconfig wlan0

wlan0 Link encap:Ethernet HWaddr 14:E6:E4:21:C1:11

inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:4816 errors:0 dropped:193 overruns:0 frame:0

TX packets:4735 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:3177476 (3.0 MiB) TX bytes:4782029 (4.5 MiB)

root@at91sam9x5ek:~# ping 192.168.1.1

PING 192.168.1.1 (192.168.1.1): 56 data bytes

64 bytes from 192.168.1.1: seq=59 ttl=64 time=1042.249 ms

64 bytes from 192.168.1.1: seq=60 ttl=64 time=42.918 ms

64 bytes from 192.168.1.1: seq=61 ttl=64 time=28.599 ms

64 bytes from 192.168.1.1: seq=62 ttl=64 time=37.782 ms

64 bytes from 192.168.1.1: seq=65 ttl=64 time=117.674 ms

从PC传输文件到板子速度为300KB

从板子上传文件到PC速度为600KB

5 下一步增加USB摄像头。。。。。

6 花了几个小时移植好了网络摄像头

主要遇到的问题就是编译生成的input_uvc.so output_http.so 为X86的，结果导致程序无法运行

root@at91sam9x5ek:/mjpg-streamer# ./mjpg_streamer -i "/mjpg_streamer/input_uvc.s

o -d /dev/video2" -o "/mjpg_streamer/output_http.so -w /www"

MJPG Streamer Version: svn rev: exported

ERROR: could not find input plugin

Perhaps you want to adjust the search path with:

# export LD_LIBRARY_PATH=/path/to/plugin/folder

dlopen: /mjpg_streamer/input_uvc.so: cannot open shared object file: No s

uch file or directory

折腾半天后，重新更改Makefile 问题解决。

root@at91sam9x5ek:/mjpg_streamer# ./mjpg_streamer -i "/mjpg_streamer/input_uvc.s

o -d /dev/video1" -o "/mjpg_streamer/output_http.so -w /www"

MJPG Streamer Version: svn rev: exported

i: Using V4L2 device.: /dev/video1

i: Desired Resolution: 640 x 480

i: Frames Per Second.: 5

i: Format............: MJPEG

Adding control for Pan (relative)

UVCIOC_CTRL_ADD - Error: Invalid argument

Adding control for Tilt (relative)

UVCIOC_CTRL_ADD - Error: Invalid argument

Adding control for Pan Reset

UVCIOC_CTRL_ADD - Error: Invalid argument

Adding control for Tilt Reset

UVCIOC_CTRL_ADD - Error: Invalid argument

Adding control for Pan/tilt Reset

UVCIOC_CTRL_ADD - Error: Invalid argument

Adding control for Focus (absolute)

UVCIOC_CTRL_ADD - Error: Invalid argument

mapping control for Pan (relative)