309579471 发表于 2015-6-9 08:48
这里还有个问题，如果显性操作 可以在软件上解密，再重新烧录。但是如果是隐形操作，我需要重新烧录程序 ...

Uint16 CsmUnlock()
{
    volatile Uint16 temp;

    // Load the key registers with the current password. The 0xFFFF's are dummy
        // passwords.  User should replace them with the correct password for the DSP.

    EALLOW;
    CsmRegs.KEY0 = 0xFFFF;
    CsmRegs.KEY1 = 0xFFFF;
    CsmRegs.KEY2 = 0xFFFF;
    CsmRegs.KEY3 = 0xFFFF;
    CsmRegs.KEY4 = 0xFFFF;
    CsmRegs.KEY5 = 0xFFFF;
    CsmRegs.KEY6 = 0xFFFF;
    CsmRegs.KEY7 = 0xFFFF;
    EDIS;

    // Perform a dummy read of the password locations
    // if they match the key values, the CSM will unlock

    temp = CsmPwl.PSWD0;
    temp = CsmPwl.PSWD1;
    temp = CsmPwl.PSWD2;
    temp = CsmPwl.PSWD3;
    temp = CsmPwl.PSWD4;
    temp = CsmPwl.PSWD5;
    temp = CsmPwl.PSWD6;
    temp = CsmPwl.PSWD7;

    // If the CSM unlocked, return succes, otherwise return
    // failure.
    if (CsmRegs.CSMSCR.bit.SECURE == 0) return STATUS_SUCCESS;
    else return STATUS_FAIL;

}