It’s been a while, but SYSRESETREQ not working right (in other code) on STM32
sounds awfully familiar.
On 25 Jan 2014, at 9:41 pm, Chuck McManis <[email protected]> wrote:
> What got me here was that the vendor (ST Micro in this case) supplies code
> doesn't seem to work, I expect that Donald is on to something and I'm
> tracking down the definition of the address at this time.
> --Chuck
>
>
>
> On Sat, Jan 25, 2014 at 9:39 PM, Michael Smith <[email protected]> wrote:
>
> On 25 Jan 2014, at 5:05 pm, Chuck McManis <[email protected]> wrote:
>
>> So I was playing around with an example I was writing and wanted to initiate
>> a software reset, basically duplicated what pushing the reset button does.
>>
>> In various docs this is called a "Software System Reset" and there is a
>> function in the cm3 sub section of loc3 that does something kinda like the
>> ARM documents called : scb_reset_system()
>>
>> That is defined as :
>>
>> void scb_reset_system(void)
>> {
>> SCB_AIRCR = SCB_AIRCR_VECTKEY | SCB_AIRCR_SYSRESETREQ;
>>
>> while (1);
>> }
>>
>> And presumably one calls this from your source and "poof!" you have reset
>> the system. Except it doesn't, it hangs there in the while(1); which seems a
>> bit odd.
>
> SYSRESETREQ is just a wire out of the core:
> The control bit SYSRESETREQ requests a reset by an external system resource.
> The system components that are reset by this request are IMPLEMENTATION
> DEFINED. SYSRESETREQ is required to cause a Local reset.
>
> And the bit is nominally owned by the debugger, not code.
>
> IOW, what it will do for you will vary pretty widely from SoC to SoC. If
> possible, prefer using a watchdog or a vendor-specific mechanism to reset if
> you can...
>
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