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--- work:quadcopter [2014/04/02 16:43] – donghee
+++ work:quadcopter [2018/07/18 14:10] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 ====== 개발  ======
+## ar9331 보드 만들기
+### USB 허브칩 ftdi GL850G
+TP WR703N의 확장 보드: GL850사용해서 만든 허브 http://www.kean.com.au/oshw/WR703N/WR703N%20Expander%20v1.pdf
+arduino yun에서 RT8010-33GQW라는 step down dcdc 사용합 1.5mhz 1A
+----
+## 알리바바에 파는 ar9331 보드
+![](http://i.imgur.com/ujk9RQQ.png)
+http://www.alibaba.com/product-gs/1333014406/150Mbps_Wireless_Module_AR9331_security_and.html
+이런거 사서 써도 되겠다. 100개 	US $5 - 30 / Piece Get Latest Price 크기 50x30
+----
+![](http://i.imgur.com/yDcJLr7.png)
+ http://www.alibaba.com/product-gs/1242172281/OPENWRT_module_WLAN_module_WiFi_module.html
+FOB Price:	US $10 - 13 /Port:	Guangzhou/ Minimum Order Quantity:	1
+----
+![](http://i.imgur.com/K4PFu7f.png)
+http://www.alibaba.com/product-gs/761550814/ar9331_module.html
+US $9 - 16 요거 작네(27.5x40.5) carambola2랑 비슷한 수준; 그런데 1000개가 기본 수량
+----
+### TL-WR703N Reverse Engineering
+ * https://github.com/Squonk42/TL-WR703N
+ * http://squonk42.github.io/TL-WR703N/
+----
+## openwrt configure for tplink 703N
+steps:
+. buy an tplink 703N, if it is A17 version , need to download an old firmware from tplink http://service.tp-link.com.cn/download/20131/TL-WR703N_V1_121204.rar
+. download the bin to downgrade the firmware
+. download tplink specific firmware with squre factory os
+. flash the firmware within the web ui
+. after reboot, link lan with laptop, and telnet into the system
+. type passwd to set new passwd for root, reboot and ssh to system with new passwd
+. change /etc/config/wireless file and reboot to enale wifi
+------------------------
+ STM32F Hard fault
+http://www.freertos.org/FreeRTOS_Support_Forum_Archive/February_2012/freertos_STM32F2_hard_fault_5015439.html
+http://www.coactionos.com/embedded-design/133-effective-use-of-arm-cortex-m3-svcall.html
+http://sourceforge.net/p/freertos/discussion/382005/thread/109acbfc
+좀 이유 설명
+Hard Fault freertos xPortPendSVHandler
+http://blog.frankvh.com/2011/12/07/cortex-m3-m4-hard-fault-handler/
+http://www.freertos.org/Debugging-Hard-Faults-On-Cortex-M-Microcontrollers.html
+http://sourceforge.net/p/freertos/discussion/382005/thread/49667801
+Mike,
+I've seen exactly this problem several times on the 205 and it was generally caused by the main 'C' stack being too small or corrupted.
+http://www.freertos.org/RTOS-Cortex-M3-M4.html
+. If you are using an STM32 with the STM32 driver library then ensure all the
+ priority bits are assigned to be preempt priority bits by calling NVIC_PriorityGroupConfig( NVIC_PriorityGroup_4 ); before the RTOS is started.
+이미 NVIC_PriorityGroup_4로 되어 있네ㅣ
+스택 사이즈?
+시스템 테스크를 2배에서 4배로 스택 크기를 수정
+ -> 그래도 죽네;; 다른때보다 3배정도는 늦게 죽는다.
+http://www.freertos.org/a00111.html
+Uart에 이걸 넣음
+vTaskSuspendAll()
+xTaskResumeAll()
+The stack in use when you call main() is recycled for use by all interrupt handlers.
+----------------
 Heli controls are like following