LM3S9B92芯片被锁了，怎么解锁？

Ellenzh

您好，我目前在使用LM3S9B92评估板，之前用IAR EWARM 5.4软件给板子下载了多个程序都可以正常显示，但是现在在下载编译程序的时候出现了这样的错误“fatal error:There were warnings during download of FLASH loader,see Log Window Session aborted!”，上网查了下说是开发板被锁了，我之前有取下JP55、56、57的短路帽，是不是这个原因导致的，可是重新安装好短路帽后，显示屏还是白屏什么程序都下载不进去，这是怎么回事？该怎么解决呢?非常感谢啦！

12 年多前

0 Teddy Liu 12 年多前

TI__Intellectual 1155 points

如果是B1版的芯片，解锁流程如下：

1.2 The Recover Locked Device sequence does not work as expected
Description:
If software configures any of the JTAG/SWD pins as GPIO or loses the ability to communicate with
the debugger, there is a debug sequence that can be used to recover the microcontroller, called
the Recover Locked Device sequence. After reconfiguring the JTAG/SWD pins, using the Recover
Locked Device sequence does not recover the device.
Workaround:
To get the device unlocked, follow these steps:
1. Power cycle the board and run the debug port unlock procedure in LM Flash Programmer. DO
NOT power cycle when LM Flash Programmer tells you to.
2. Go to the Flash Utilities tab in LM Flash Programmer and do a mass erase operation (check
"Entire Flash" and then click the Erase button). This erase appears to have failed, but that is
ok.
3. Power cycle the board.
4. Go to the Flash Utilities tab in LM Flash Programmer and do another mass erase operation
(check "Entire Flash" and then click the Erase button).
Silicon Revision Affected:
B1
Fixed:
Fixed in Rev C.