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F021 API 擦除Flash总是在while(FAPI_GET_FSM_STATUS!=Fapi_Status_Success);这里死住;

使用官方给 的Bootloader uart 的程序在下载的时候总是 在  

Fapi_issueAsyncCommandWithAddress(Fapi_EraseSector, eraseStartAddr);  

while( FAPI_CHECK_FSM_READY_BUSY == Fapi_Status_FsmBusy );

之后 死在这一句----》while(FAPI_GET_FSM_STATUS != Fapi_Status_Success);

不知道为什么,希望大家能给我解答一下,官方的更好;