• State Not Answered
  • Locked Locked
  • Replies 3 replies
  • Subscribers 22 subscribers
  • Views 935 views
  • Users 0 members are here
Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

lpc1788 sdram after watchdog reset

@Marc Crandall

Hello,

I'm using an LPC1788 with a MT48LC16M16 SDRAM chip. All works well and I do not have any issues with the external memory in normal operation.

I use a bootloader to configure the external memory and run a memory check. My problem is when I get a watchdog reset in the main application (I'm causing them on purpose for testing) the configuration of the external SDRAM runs in the bootloader and one of two things happens:

1) Everything works exactly the same as on a power up (50% of the time)

2) As soon as I try and access the memory I get a fault that kills my debugger. (The other 50% of the time)

Does anyone have any idea what is going on? Note I have tried this with SCB bit 1 on/off no difference. I've also tried not re-configuring the EMC when it's a watchdog reset but this seems to fail every time.

Does anyone know how to safely and surely reset this SDRAM?

Thanks

M

Parents
  • 0 in reply to Tamiryan Michael

    Thanks for the replies.

    @JB JB losing all the SDRAM data is not a problem (This is expected when a watchdog reset occurs for my design).

    @Tamir - By fail every time I mean the SDRAM configuration/initialization. In other words the bootloader runs fine, it configures the SDRAM but at the first point of access of the external ram it hard faults.

    I also have some external NOR and because this device has a reset line I never get any issues.
    With the SDRAM it's like I'm not forcing it to reset properly.

Reply
  • 0 in reply to Tamiryan Michael

    Thanks for the replies.

    @JB JB losing all the SDRAM data is not a problem (This is expected when a watchdog reset occurs for my design).

    @Tamir - By fail every time I mean the SDRAM configuration/initialization. In other words the bootloader runs fine, it configures the SDRAM but at the first point of access of the external ram it hard faults.

    I also have some external NOR and because this device has a reset line I never get any issues.
    With the SDRAM it's like I'm not forcing it to reset properly.

Children
No data