Hi, the other Rob ;-)
Thanks, looks very interesting. My suspicion so far is that, from a certain
address on, the variables are falsely mapped to unimplemented and SFR areas.
This is probable for both the k42 and the q43 types, as their SFR pattern is
different: q43 has all SFRs densely packed in five banks with few "reserved"
spaces in between. k42 has the SFRs scattered over eight banks with lots of
"unimplemented, reads as zero" spaces in between. Those patterns resemble parts
of the patterns of the wrong variable readings.
Sorry for not making the test program portable, I had to suffer myself: The
18f26k22, which was the only other controller I had which would fit on the
board at all, has no pps and no open-drain function. After finally choosing the
keyboard over the soldering iron, I made a copy of serial_software.jal and
modified it to mimic open-drain behaviour.
Am Donnerstag, 12. November 2020, 16:38:45 MEZ hat Rob Hamerling
<[email protected]> Folgendes geschrieben:
Hi Kiste,
On 12/11/2020 12.57, 'Oliver Seitz' via jallib wrote:
Hi Rob!
It does make a difference: On a pic18f26k22, all the RAM seems to be working
properly. To my knowledge, the 18f27k42 was the first 8-bit PIC controller with
more than 4k of RAM. Yet to test would be 18f[2|4|5]7q43 with 8k and
18f[2|4|5]7q84 with 13kb of RAM. Both again with a different layout, Access
bank on these is comprised of parts of bank 5 and 4 of 64 banks in total.
I have a 18F27Q43 here and tried to use your program. That didn't go straight
forward: fusedef 'debug' was refused, TX and RX on my test board were at
different pins, and the serial lib gave errors (PIR3 and PIE3 had to be changed
to PIR4 and PIE4). After the required (provisional) changed the program finally
compiled fine! The output is quite different from yours, see attachment, but
also not as expected I think! I doubt if this helps to find the cause of the
problem, but at least it proves that it is not unique to the 18f27k42.
Regards, the other Rob!
--
Rob Hamerling, Vianen, NL
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