topic Re: how to enter ISP mode via user application--LPC55S06 in LPC Microcontrollers

how to enter ISP mode via user application--LPC Board

anshulkhare — Thu, 05 Jan 2023 14:04:08 GMT

Hi all,
i am trying to find API for entering in UART ISP mode in LPC board.
There is a firmware which is up and running on the board, from that firmware, i need to call the API to enter into ISP mode.
can anyone guide me on this, if it is possible from user application?
is there any application note or example is available for the same?

can anyone guide for the application note for communicating in ISP mode using blhost?

Thanks in Advance.

Re: how to enter ISP mode via user application--LPC55S06

Pavel_Hernandez — Tue, 27 Dec 2022 22:09:12 GMT

Hello,

I review your information and I recommend review the RunBootloader API chapter 9.3.4 in User Manual.

The ROM bootloader provides an API for the user application to enter the ISP mode
based on the designated ISP interface mode.

And suggest review the documentation for the blhost. MCUBLHOSTUG.pdf (nxp.com)

This thread maybe could help you. Solved: Configure LPC55 to enter/re-invoke ROM Bootloader ... - NXP Community

If you have more questions, please let me know.

Best regards,
Pavel

Re: how to enter ISP mode via user application--LPC Board

anshulkhare — Mon, 16 Jan 2023 09:49:16 GMT

@Pavel_Hernandez Thanks for your reply.

in ISP mode can we upgrade signed image on the chip where security is enabled, using blhost?

Re: how to enter ISP mode via user application--LPC Board

Pavel_Hernandez — Tue, 17 Jan 2023 00:02:35 GMT

Hello,

If you mean "security is enabled" is the "secure boot" turned on, so you can't program a new image anymore.

Best regards,
Pavel

Re: how to enter ISP mode via user application--LPC Board

anshulkhare — Tue, 17 Jan 2023 06:00:37 GMT

Hello @Pavel_Hernandez

does it mean if secure boot is enabled ,in that case user application can not be upgrade using ISP or IAP?

Re: how to enter ISP mode via user application--LPC Board

Pavel_Hernandez — Wed, 18 Jan 2023 00:03:37 GMT

All ISP, JTAG. IAP can be used to program after enabling a secure boot. but you must use it program signed image, otherwise, it can't pass the secure boot check.

It's not possible to program the flash with IDE debug because it's not a signed image when debugging code.

AN12283 LPC55Sxx Secure Boot
AN13037 LPC55Sxx Debug Authentication

Maybe that app note could help you.

Best regards,
Pavel