There's not really enough detail to determine exactly what's wrong.
Since you indicate you can set the hpg.pwmgen.00.out.xx.value signals
and get expected results, it sounds like the PRU is properly generating
PWM signals. Note that by default the value signal is normalized, so
0.0 is "always off", 1.0 is "always on" and 0.5 is "on half of the time".
I do like to explicitly set the PRU period, but I doubt that's causing
your problems:
https://github.com/cdsteinkuehler/machine-configs/blob/master/configs/CoreXZ/CoreXZ.ini#L3
So if the PWM is working correctly the problem is likely with the PID or
temperature code. Use halmeter, halsscope, or just "halcmd show pin" to
see what the signals are doing. If you can't tell what's wrong, post
some additional debugging from these utilities and maybe we can spot
what's going wrong.
Finally, one thing that trips up a lot of CRAMPS users is you have a
bunch of different power supply connections. There are three different
supplies for the CRAMPS FET outputs:
P402: EXTPWR (E0, E1, E2)
P403: BEDPWR (BEDHTR output)
P404: AUXPWR V+ (FET5, FET6)
Make sure you have all the necessary supply rails connected. The LED
next to the FET output connector should light when the FET is on and
power is properly applied. For testing, you can use halcmd to set any
signals that are not being actively driven (eg: halcmd setp
hpg.pwmgen.00.out.02.value 1.0) without having to edit your HAL file and
relaunch.
On 1/25/2021 9:58 PM, Pete McKenna wrote:
My first attempts at posting haven't worked. I'll post the files if this
post works.
I have an Ordbot I'm adding BBB+ CRAMPs control too. I have the motion
control working reasonably well, but I can't get control of the FETs for
the extruder and fan control, if I hack the hpg.pwmgen.00.out.xx.value I
can enable them, but not with any pid / feedback control. ( I can confirm
the FETs work and the extruder heats and the fan runs via hacking the vaule
)
I have checked the thermistor, and it works as expected. What I can't
figure out is how to get the commanded temp to go to anything other than 0.
I have pre-heat settings, I've tried to use the remaped M codes for 104 and
109 (and 106 for the fan) but I get nothing. My configs are attached, if
anyone has a BBB and CRAMPS working for 3D printing, or FET controls I'd
love to get your advice.
Thanks
Pete
--
Charles Steinkuehler
char...@steinkuehler.net
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github:
https://github.com/machinekit
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