Kinetis Microcontrollers中的主题 Re: how to set kea128 Flash security?

how to set kea128 Flash security?

LiangDevJack — Mon, 18 Nov 2024 10:39:57 GMT

您好，我在使用kea128单片机时遇到一个问题。

我想让单片机的Flash不会被外部设备所读取，但是使用Jlink配置这个的时候，我不能配置，请告诉我有什么方法可以打开这个Flash security？或者有代码可以分享一下吗？

谢谢！

Re: how to set kea128 Flash security?

xiangjun_rong — Tue, 19 Nov 2024 02:57:38 GMT

Hi,

Pls refer to the startup_kea128.c, there is Flash_Config array. If you set the last BYTE in the red circle as FE, the flash will be in unsecurity mode, the SWD/JTAG can be accessed. If you set the last BYTE in the red circle as FF, or FD, the flash will be in security mode, the SWD/JTAG can NOT be accessed.

But you can execute mass-erase to set the flash in unsecurity mode.

Because I have not the project based on KEA family, so I use the K64 project, but the Flash_Config array is the same.

Hope it can help you

Xiangjun Rong

Re: how to set kea128 Flash security?

LiangDevJack — Tue, 19 Nov 2024 06:12:24 GMT

十分感谢您的回复，我按照你的指示，找到了启动文件，最后一个字节修改成FF，如图所示

但是，我重新编译了一下下载进去，发现使用JLINK还是能够读取到Flash内容

请问是哪里不对吗？少了些步骤吗？

Re: how to set kea128 Flash security?

xiangjun_rong — Wed, 20 Nov 2024 02:54:42 GMT

Hi,

那您读一读FTFE_FSEC寄存器的值（其地址为0x002_0002），看看SEC bits改了没有。

XiangJun Rong

Re: how to set kea128 Flash security?

LiangDevJack — Thu, 21 Nov 2024 08:30:32 GMT

十分感谢您的回复，我尝试修改FTMRE_FSEC这个值，但发现无论如何都不能修改成功。查看手册，KEA128单片机似乎不支持写操作。

Re: how to set kea128 Flash security?

xiangjun_rong — Thu, 28 Nov 2024 07:49:39 GMT

Hi,

您不能直接写FTMRE-FSEC register, 您必须写flash configuration field space, 系统会拷贝flash configuration field space的数据到寄存器。

多谢

XiangJun Rong

Re: how to set kea128 Flash security?

winter1999 — Sat, 11 Jan 2025 05:46:48 GMT

__root const uint8_t ChipSecure@0x40EU = 0x7CU;