如图标红部分，请问这个函数中的这个判断是什么意思？

well i asked the same question some time ago, did not get any proper answer.

it seems they try to place ROM_CRTL= ROM_CMD_ERASE; allways on odd or even address regardless the startaddress of that function. In my case it was always a odd address but this heavily compiler and optmize settings dependend.

I never found a reason for this construct.  Erase works just fine on odd and even.

Strange code, possible error CH559 - Heng Heng microelectronics community (wch.cn)

您好，这部分的代码建议参考CH559EVT中的操作流程。