What to do while watchdog is ON while loading flash image to microcontroller?

[chetansantoki]

Hi,

I have two images in my controller.

1. Bootloader image and 2. Application Image.

I am enabling watchdog in bootloader image(it must required as per our application) which execute once in boot up and I am feeding watchdog in my application image. There are not any issue with application oriented its working fine.

But while i am downloading application image watch dog would be ON so after timeout of watchdog time its getting reset in between of downloading flash. What can i do for abort watchdog reset while programming?

Notes: I cant consider increase watchdog time due to my flash image is large so i cant afford it. 

Please help to come out of this.

Regards,

Chetan Santoki.

[lpcxpresso_supp]

If you want to program your application into flash over a debug connection, then try booting your part into ISP mode before making the debug connection. For details see: https://community.nxp.com/message/630748 

Regards,

LPCXpresso Support

[chetansantoki]

In my application:

on Start up:

Boot loader application: after checking is there any new updates available it Initialize watchdog and start it. After starting watchdog it jumps to main application.

In application: I am feeding watchdog. even downloading image in application firmware so there are not any issue with OTA downloading or my application.

now if i am downloading any image through JTAG program should passed through boot loader code means watchdog is started. and now i am trying to program application sections using JTAG then i am facing watch dog reset in between due to application is erased so cant feed watchdog.

[uditsalunke]

Chetan,

as watchdog is enabled, boot loader code should feed watchdog during Application image download and programming.

or you could disable watchdog before starting application download - I will not recommend this.

[chetansantoki]

Sorry but i did not mention that i facing issue while downloading image through JTAG , LPCexpresso. How can i feed while image is downloading through JTAG.

[uditsalunke]

So on hardware, you have Boot Loader in execution and Application image is being programmed using JTAG and during this process you are getting watchdog reset.  is that the case? 

is this a software watchdog or external hardware? 

"" which execute once in boot up and I am feeding watchdog in my application image. There are not any issue with application oriented its working fine " I have some Q's here ...

what is sequence to pass control to Application from Boot Loader? does boot loader de-init watchdog timer?

how application knows the information about time interval to feed the watchdog ?