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???
12/28/04 15:38
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 		 #83983 - comments^3
Responding to: ???'s previous message
<font=-1>(sorry I am no able to quote with this browser, so quoting just loosely)
...no sense transmitting to a nonpowered device...
- au contraire, makes no sense checking, if device is or is not powered, when transmitting to it. The very example is the posting starting this thread.

...without opening the box...
you need at least to reset the mcu, requiring your presence (or a special wire) - just one step from flipping a conveniently situated switch (or having 1 more wire). And no more uncertainty...
And my "long break" option is no worse, no opened box, but also no false bootloader start.
And all the time I am talking about options, the present state may still be the default.

the boot init is a hw function
how do you mean? The fact that the bootloader starts after a hard reset is a hw fact, but the bootloader itself (including the autobaud, "U" wait, said-400ms delay, SoftICE, IAP functions, password protection etc.) is nothing less, nothing more than sw, residing in the 8kB shadow flash at 0000. Hence, reprogrammable, modifiable (Philips itself published an upgrade on its site).

Jan Waclawek


List of 26 messages in thread
TopicAuthorDate
RS485 Contention.            01/01/70 00:00      
   485 ISP            01/01/70 00:00      
      RS485 'U' & ISP            01/01/70 00:00      
         the crux            01/01/70 00:00      
            Flashmagic !!!!            01/01/70 00:00      
            RS485 contention            01/01/70 00:00      
            Cygnal F12x            01/01/70 00:00      
            Reply to Erik            01/01/70 00:00      
               FM< half duplex            01/01/70 00:00      
                  Reply to Erik            01/01/70 00:00      
                     bus direction            01/01/70 00:00      
                        A few comments            01/01/70 00:00      
                           comnments on comments            01/01/70 00:00      
                              comments^3            01/01/70 00:00      
                                 boot NIT            01/01/70 00:00      
                                    An example worth 3E8h words :-)            01/01/70 00:00      
            A fundamental query - Erik            01/01/70 00:00      
               testing            01/01/70 00:00      
   RS 485 Contention            01/01/70 00:00      
      RS485 Contention            01/01/70 00:00      
   Switch ?            01/01/70 00:00      
      RS485 contention            01/01/70 00:00      
   Possible solutions.            01/01/70 00:00      
   Thanks Erik.            01/01/70 00:00      
   SOLUTION            01/01/70 00:00      
      Thanks but thats not the solution            01/01/70 00:00      

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