Lpc2000

Answers interspersed
-Bill


On Fri, 08 Apr 2005 13:35:28 +1000, Bruce Paterson wrote:


Bill Knight wrote:

> I just uploaded a set of LPC flash programming routines to the files area
> on Yahoo.  They were written for gcc and support both ARM and Thumb modes
> of operation.  Hopefully, they will prove useful to the group.

Bill,

Just been having a look at your routines as I need to do some IAP now 
myself.
I have a few questions to you/the group if you don't mind:

1/ I notice you expect CMD_SUCCESS, never BUSY back from calling iap. 
This implies to me the iap routines always execute to completion before 
returning (this conficts with another posting to this group which showed 
a for(;;) loop waiting for non-BUSY return). Confused !

*** The code simply returns the result whenever it is not CMD_SUCCESS or
when done.  A test for BUSY could be added to flashWrite() with a limit
to the number of tries.  So far, I have not found this to be a problem
but YMMV.

2/ If the iap routines don't return till all is done, what happens to 
the watchdog ? The watchdog cannot be disabled once started, so do
a) the iap routines feed the watchdog internally (philips question) ?
b) we need to reboot with watchdog disabled in order to do IAP ?

*** I'll leave the answer for this one to the Philis Apps guys.

3/ I notice you prepare all sectors for write every interation of your 
writing loop. Is this just for easier coding ?

*** Caught me.  Because the translation from address to sector number
is different between various LPC parts, I chose to do it the simple
way.

4/ In what cases would memmap be anything other than user code in 
practice ? (I notice you save and restore).

*** Not exactly.  The interrupt vectors could have been remapped
to RAM.

-- 
Cheers,
Bruce