LPC Microcontrollers中的主题 Re: LPC804 Stuck or crash on IAP_ReadUniqueID

LPC804 Stuck or crash on IAP_ReadUniqueID

MHMart — Wed, 17 Apr 2024 08:25:54 GMT

I'm trying to read the Unique ID of a LPC804 but, I think it was working before, now I cannot access the UID any longer.

The following function makes the whole process stop and not continue. In the debugger I find that IAP_ReadUniqueID is executed (although maybe not with success?) but a breakpoint on the status check is never reached.

uint32_t UIDValue = 0x00; status_t UIDStatus = kStatus_Fail; // Read the UID UIDStatus = IAP_ReadUniqueID(&UIDValue); // Return when failed if(UIDStatus != kStatus_Success) return; // insert UID into message data[3] = (uint8_t)((UIDValue >> (8 * 3)) & 0xFF); data[4] = (uint8_t)((UIDValue >> (8 * 2)) & 0xFF); data[5] = (uint8_t)((UIDValue >> (8 * 1)) & 0xFF); data[6] = (uint8_t)(UIDValue & 0xFF);

Since I think it was working prior, might the flash memory have been emptied or reset? What could it be or what can I check?

Re: LPC804 Stuck or crash on IAP_ReadUniqueID

ErichStyger — Wed, 17 Apr 2024 11:10:54 GMT

IAP_ReadUniqueID() expects a pointer to 128bits (4 x 32bit values).

You see this if you step into IAP_ReadUniqeID().

You are passing only a pointer to 32bits, so memory gets overwritten. Fix that and it should work.

Re: LPC804 Stuck or crash on IAP_ReadUniqueID

MHMart — Thu, 18 Apr 2024 06:54:40 GMT

Thanks, amazing! That solved my issue.

I could, indeed, have figured that out by checking the function.

In my defense though, this documentation could be updated to fit that explenation?

https://mcuxpresso.nxp.com/api_doc/dev/2167/a00070.html#ga258d8c49d494cbd0d18321af56e11440

Seems an important requirement that isn't mentioned directly.