On 21 Apr 2012 at 9:31, Goran Hosinsky wrote:

> Can do a GOTO from an interrupt and continue in another part of the main=
=20
> program - or will the return
> from interrupt mix up the program?
>=20
> I spend most of the time in  __delay_ms with delays of 30 seconds. In=20
> case of an UART interrupt I need to
> get out of the delay routine, do some housekeeping (closing ports) and=20
> go elsewhere in main where I will
> handle the rs232 data.

Hi Goran. No problem with the interrupt interrupting the delay routine... i=
nterrupts=20
are made for interrupting, so that part is ok. But yes you will have major =
problems if=20
you try to use a GOTO to get back to some other part of the main program fr=
om the=20
interrupt routine.

One method would be to get the Interrupt routine to set a flag when RS232 d=
ata has=20
been received. In some of my applications the interrupt routine also does s=
ome=20
basic parsing/filtering of the data, taking care not to spend too much time=
 in the=20
interrupt routine so it can be rady to respond to the next received charact=
er, and=20
then the flag is only set when valid data has been received. You mentioned =
in=20
another post that your 30 second delay is a loop of smaller delays. Somewhe=
re=20
within the delay loop you could check for the received data flag, perhaps e=
xiting the=20
delay altogether to process the data and do whatever else needs to be done.

--=20
Brent Brown, Electronic Design Solutions
9 Titoki Place, Pukete,
Hamilton 3200, New Zealand
Ph: +64 7 849 0069
Fax: +64 7 849 0071
Cell: +64 27 433 4069
eMail:  brent.brown@clear.net.nz



--=20
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