topic Re: How to jump back from bootloader to user application? in S12 / MagniV Microcontrollers

How to jump back from user application to bootloader?

nada_amani123 — Mon, 25 Mar 2019 08:28:06 GMT

Hello,

I am currently using can bootloader for MC9S12P

I have succedded in programing the flash but the problem is that I don't know how to jump back to the bootloader

N.B : I don't have access to any gpio pin in the board i'm using so I can't have a physical input to switch between bootloader and user application

Here's my .prm file :

Start12.s :

Thank's in advance for your help !

Re: How to jump back from bootloader to user application?

kef2 — Mon, 25 Mar 2019 09:04:00 GMT

BootloaderKey @ 0xC00 seems being located in D-flash. So you need to reprogram it to 0x5aa5 and trigger device reset, could be COP watchdog reset.

Re: How to jump back from bootloader to user application?

nada_amani123 — Mon, 25 Mar 2019 09:34:54 GMT

Sorry I meant to jump back from user application to bootloader

Re: How to jump back from user application to bootloader?

kef2 — Mon, 25 Mar 2019 09:43:56 GMT

So I understood. Reprogram BootloaderKey @ 0c00 from application to 0x5aa5 and trigger COP reset (enable COP if disabled, then either enter forever loop or write non 0xAA/0x55 value to CPMUARMCOP).

Re: How to jump back from user application to bootloader?

dianabatrlova — Wed, 27 Mar 2019 15:00:38 GMT

Hello Nada,

Did you figure it out?

Best Regards,

Diana