On Thu, Jan 11, 2018 at 12:44:35PM -0800, tim Rowledge wrote:
On 10-01-2018, at 7:53 PM, David T. Lewis lewis@mail.msen.com wrote:
From looking at the Makefile, I would say that the init script is being installed but it has not been wired into the system boot processing. Possibly the person who wrote the makefile left that part as an "exercise for the reader???.
The odd thing is that it does appear to try to start on boot (but inevitably fails because pigpiod is not autostarted) and I see
systemctl status pca9685servo ??? pca9685servo.service - LSB: Start/stop pca9685servod. Loaded: loaded (/etc/init.d/pca9685servo; generated; vendor preset: enabled) Active: inactive (dead)
I'm pretty much shooting in the dark here, but it sounds like your pca9685servod daemon depends on the pigpiod daemon, and maybe the former fails to start cleanly if the latter has not previously been started.
Maybe you just need to make sure that pigpiod is autostarted at boot time. Here is a link that might help:
https://www.raspberrypi.org/forums/viewtopic.php?f=32&t=103752
Dave
Give this a try and see if it works: Reboot the Pi, at which point the servo will not be working. Then run this command (possibly with sudo in front if it if you are not root):
# /etc/init.d/pca9685servo start
This gets a bit odder seeming to me -
pi@PiCamera-1:~ $ sudo /etc/init.d/pca9685servo start Device address = 0x40 Requested servo cycle time: 20000.000us Pulse increment step size: 5.000us Setting prescale value to: 121 Actual frequency: 50.029 Actual cycle time: 19988.480us Minimum width value: 500.000us (100) Maximum width value: 2500.000us (500)
Setting prescale value to: 121 pi@PiCamera-1:~ $ echo 0=70% > /dev/pca9685servo Raw width input = 70.000000 % specified -> 0.700000 set servo[0]=70.000000 % servo on: 0 off: 389
??? but the servo doesn???t move. Another status check - pi@PiCamera-1:~ $ systemctl status pca9685servo ??? pca9685servo.service - LSB: Start/stop pca9685servod. Loaded: loaded (/etc/init.d/pca9685servo; generated; vendor preset: enabled) Active: inactive (dead)
ps aux says there is only one pca daemon running. So let???s try stopping it ??? ok, no pca running anymore. Run it completely manually - pi@PiCamera-1:~ $ sudo /usr/local/sbin/pca9685servod Device address = 0x40 Requested servo cycle time: 20000.000us Pulse increment step size: 5.000us Setting prescale value to: 121 Actual frequency: 50.029 Actual cycle time: 19988.480us Minimum width value: 500.000us (100) Maximum width value: 2500.000us (500)
Setting prescale value to: 121 pi@PiCamera-1:~ $ echo 0=70% > /dev/pca9685servo Raw width input = 70.000000 % specified -> 0.700000 set servo[0]=70.000000 % servo on: 0 off: 389
.. servo moves as expected. Gronk?
If i completely remove the /etc/init.d/pca9685servo script to make sure it can???t autostart and reboot then I do actually get to restart from clean. pi@PiCamera-1:~ $ ps aux | grep pca pi 1195 0.0 0.0 4380 576 pts/0 S+ 12:21 0:00 grep --color=auto pca
And to make life still more annoying manually starting the daemon results in no servo motion.
Reboot once more; no pigpiod nor pca runnig. start pigpiod start pca ps says both running try to move servo - nope.
pi@PiCamera-1:~ $ systemctl status pca9685servo ??? pca9685servo.service - LSB: Start/stop pca9685servod. Loaded: loaded (/etc/init.d/pca9685servo; generated; vendor preset: enabled) Active: active (running) since Thu 2018-01-11 12:30:16 PST; 3min 21s ago Docs: man:systemd-sysv-generator(8) Process: 1231 ExecStart=/etc/init.d/pca9685servo start (code=exited, status=0/ CGroup: /system.slice/pca9685servo.service ??????1238 /usr/local/sbin/pca9685servod
Jan 11 12:30:16 PiCamera-1 systemd[1]: Started LSB: Start/stop pca9685servod.. Jan 11 12:30:34 PiCamera-1 pca9685servo[1231]: Raw width input = 70.000000 Jan 11 12:30:34 PiCamera-1 pca9685servo[1231]: % specified -> 0.700000 Jan 11 12:30:34 PiCamera-1 pca9685servo[1231]: set servo[0]=70.000000 % Jan 11 12:30:34 PiCamera-1 pca9685servo[1231]: servo on: 0 off: 389 Jan 11 12:30:40 PiCamera-1 pca9685servo[1231]: Raw width input = 10.000000 Jan 11 12:30:40 PiCamera-1 pca9685servo[1231]: Add 0.100000 to 0.700000 = 0.8000 Jan 11 12:30:40 PiCamera-1 pca9685servo[1231]: % specified -> 0.800000 Jan 11 12:30:40 PiCamera-1 pca9685servo[1231]: set servo[0]=80.000000 % Jan 11 12:30:40 PiCamera-1 pca9685servo[1231]: servo on: 0 off: 430
So clearly it is running and receiving commands but failing at something. If I kill that incarnation and manually start with pi@PiCamera-1:~ $ sudo /usr/local/sbin/pca9685servod then my servo moves.
Is everyone else as baffled as me?
tim
tim Rowledge; tim@rowledge.org; http://www.rowledge.org/tim Strange OpCodes: D: Detonate