>>>>> "Jens" == Jens Bauer <[email protected]> writes:
Jens> Hi all. On Sun, 18 Jan 2015 01:01:57 +0100, Jens Bauer wrote:
>> If I make the following program:
>>
>> int main() { while(1) { __WFI(); } }
Jens> Note: If I change __WFI(); to __NOP(); there are no problems.
Jens> -One thing I forgot to say is that I'll usually need to take out
Jens> the external crystal, before I attempt to repeat a 'reset halt'
Jens> until I get the target to halt.
I have the same problems. In principle these problems should be solved by
setting the Low Power debug bits similar like
proc stm32_default_examine_end {} {
# Enable debug during low power modes (uses more power)
mww 0xe0042004 0x00000007 ;# DBGMCU_CR = DBG_STANDBY | DBG_STOP |
DBG_SLEEP
# Stop watchdog counters during halt
mww 0xe0042008 0x00001800 ;# DBGMCU_APB1_FZ = DBG_IWDG_STOP |
DBG_WWDG_STOP
}
$_TARGETNAME configure -event examine-end { stm32_default_examine_end }
However when some problem with OpenOCD and a STM32 in __WFI mode happens,
it was hard to get the setup functional again. At that point I normally
switch to blackmagic
https://github.com/blacksphere/blackmagic
and things work as expected.
Probably blackmagic runs some JTAG sequence on the sleeping device in a
tight loop and can reconnect, while OpenOCD has to do Host<->debugger
transactions for that loop and probably misses some window of opportunity to
gain access to the debug target.
Bye
--
Uwe Bonnes [email protected]
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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