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CC2540 USB bootloader问题

Other Parts Discussed in Thread: CC2540

我用SimpleBLEPeripheral工程按照HostTestReleaseCC2540USB-UBL工程修改之后生成了.bin文件,但是我用usb升级固件的时候,把bin文件拖进去,但是程序并未更改,而且usb没有变成虚拟串口(成功标志),我的Post-build command line 配置是这样"$PROJ_DIR$\..\..\common\cc2540\cc254x_ubl_pp.bat" "$PROJ_DIR$" "ProdUBL" "$PROJ_DIR$\CC2540\Exe\CC2540UBL"

而且我在SImpleBLEPeripheral_Main.c里面在 osal_start_system(); 后面添加了

#if defined FEATURE_UBL_MSD
extern void ublAppForceBoot(void);
ublAppForceBoot();
#endif

不知为何程序没跳转到我生成的bin文件,求各位TI的工程师给点指点啊,谢谢了