Read UID(Unique ID) on i.MXRT RT1050

[dynamix]

Hello everyone,

I am trying to read the unique ID on i.MXRT RT1050. First I read it like below:

uint32_t id1 = OCOTP->CFG0; uint32_t id2 = OCOTP->CFG1;

Then, I found in the forum that the right way to do so is:

OCOTP_ClearErrorStatus(OCOTP);
OCOTP_ReloadShadowRegister(OCOTP);
uid_read_data[0] = OCOTP_ReadFuseShadowRegister(OCOTP, fuse_address[0]);
uid_read_data[1] = OCOTP_ReadFuseShadowRegister(OCOTP, fuse_address[1]);

However, the second approach gives me only zero while the first one gives something more meaningful. Could anyone please tell me why reading directly from the register is not right, and why the second method does not work properly?

Thanks in advance.

[jeremyzhou · Accepted solution]

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
I adapt the evkbimxrt1050_ocotp_example demo in the SDK library and run it, I find these two approaches both can get the unique ID successfully.
I attach the test result below and the attachment is the demo code, please give it a try.

Have a great day,
TIC

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[dynamix]

Thank you so much! I realized that I did not initialize OCOTP in my code.

[mjbcswitzerland]

Hi

As reference, it is done like this in the uTasker project:

    POWER_UP_ATOMIC(2, OCOTP_CTRL_CLOCK);
    fnDebugMsg("i.MX RT Unique ID:");
    fnDebugHex(HW_OCOTP_CFG2, (WITH_SPACE | WITH_LEADIN | sizeof(unsigned long)));
    fnDebugMsg("-");
    fnDebugHex(HW_OCOTP_CFG0, (sizeof(unsigned long)));
    fnDebugHex(HW_OCOTP_CFG1, (sizeof(unsigned long) | WITH_CR_LF));
    POWER_DOWN_ATOMIC(2, OCOTP_CTRL_CLOCK);

i.MX RT Unique ID: 0x50000020-b96fe9ba916bfa5a

Regards

Mark