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Register.ResetFlags anomaly

 
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DH*
Guest
Posted: 14 July 2006, 12:38 PM    Post subject: Register.ResetFlags anomaly Reply with quote
I am seeing Register.ResetFlags = 5 at power on. (ZX-40)
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dkinzer
Site Admin


Joined: 03 Sep 2005
Posts: 2593
Location: Portland, OR
Posted: 14 July 2006, 15:11 PM    Post subject: Reply with quote
That value includes Brown-out Reset (&H04) and Power On Reset (&H01). Depending on the characteristics of your power source, that may reflect reality. It may be best to code your application to give POR the highest precedence, ignoring the presence of other bits.
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DH*
Guest
Posted: 14 July 2006, 15:39 PM    Post subject: Reply with quote
dkinzer wrote:
That value includes Brown-out Reset (&H04) and Power On Reset (&H01).
I figured that was what it meant and have coded accordingly but I think the manual should reflect that multiple bits may be set.

I'm using a switchmode +5V supply plugged into a powerstrip that has a switch. I see 5 when I use the switch and 1 if I plug the already on PS into my board so it does reflect reality.

Do RAM variables survive a WDT reset?
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dkinzer
Site Admin


Joined: 03 Sep 2005
Posts: 2593
Location: Portland, OR
Posted: 14 July 2006, 15:53 PM    Post subject: Reply with quote
Quote:
Do RAM variables survive a WDT reset?

No. Statically allocated variables (defined at the module-level or defined within a procedure with the Static modifier) are initialized to zero when the program begins running. Dynamically allocated variables (defined within a procedure without the Static modifier) are uninitialized except for string variables but you can count on their having any particular value.
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DH*
Guest
Posted: 14 July 2006, 16:26 PM    Post subject: Reply with quote
For troubleshooting purposes it would be handy to have a user writable memory byte that survives resets. I can use EEPROM but aesthetically I like the idea of it being a register type of variable.

I assume you mistyped
Quote:
but you can count on their having any particular value
.
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dkinzer
Site Admin


Joined: 03 Sep 2005
Posts: 2593
Location: Portland, OR
Posted: 15 July 2006, 14:58 PM    Post subject: Reply with quote
dhouston wrote:
I assume you mistyped
Quote:
but you can count on their having any particular value
.

Indeed. The not is missing.
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