Hello William,
so I tried your approach however without success. Here is how I did it:
- I exported the capes to sys/devices/platform/bone_capemgr/slots.
This reads now as follows:
0: PF---- -1
1: PF---- -1
2: PF---- -1
3: PF---- -1
4: P-O-L- 0 Override Board Name,00A0,Override Manuf,BB-UART1
5: P-O-L- 1 Override Board Name,00A0,Override Manuf,BB-UART5
6: P-O-L- 2 Override Board Name,00A0,Override Manuf,univ-wph
- I changed directory and exported all pwms
cd /sys/class/pwm
for chip in *; do for i in 0 1; do echo ${i} > ${chip}/export; done ;
done
- This is what I see in one of the directories
root@beaglebone:/sys/class/pwm/pwmchip0/pwm0# ls
duty_cycle enable period polarity power uevent
- After that i change to the /sys/class/pwm folder and set all pwms
to 50% duty cycle and 100000 ns Period via the following command:
cd /sys/class/pwm
for chip in *; do for i in 0 1; do echo 100000 > ${chip}/pwm${i}/period;
echo 50000 > ${chip}/pwm${i}/duty_cycle; echo 1 > ${chip}/pwm${i}/enable ;
done ; done
I checked, and all directories read as follows
root@beaglebone:/sys/class/pwm/pwmchip0/pwm0# cat enable period duty_cycle
1
100000
50000
However I could not produce any outputs. I measure all channels with an
oscilloscope, but unfortunately no success. Do you know what I did wrong?
Best regards,
Phil
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