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TMS320F2808使用CCS7.0烧录FLASH问题

Other Parts Discussed in Thread: TMS320F2808, UNIFLASH

我使用CCS7.0,选择2808_RAM_Ink.cmd文件,对TMS320F2808进行仿真,运行OK。

选择F2808.cmd文件,对TMS320F2808进行FLASH烧录,失败并有以下错误信息:

C28xx: Flash Programmer: Device is locked or not connected. Operation cancelled.
C28xx: File Loader: Memory write failed: Unknown error
C28xx: GEL: File: E:\longji work\workspace_v7\MobilePowerSupply\MobilePowerSupply\Release\MobilePowerSupply.out: Load failed.

这是这个芯片第一次烧录。

请问这个问题该怎么解决?