Adafruit_BBIO PWM does not work P9_22 and P9_42.

[Altantsooj]

Adafruit_BBIO PWM does not work P9_22 and P9_42. (ECAPPWM0, ECAPPWM2) How can i solve that? Help me pls.

[Altantsooj]

I need 8 PWM port need. But just 6 PWM working...

[silver2row]

Hello,

Do you have kernel 4.9.x?

Seth

P.S. See here: #170.

[pdp7]

@Altantsooj I'd like to get some information about what is currently running on your BeagleBone.

Please paste the output of the following commands:

cat /etc/dogtag 
cat /etc/debian_version 
cat /proc/cmdline 
cat /sys/devices/platform/bone_capemgr/slots
cat /boot/uEnv.txt 
config-pin -q p9.22
config-pin -q p9.42
uname -a

[Altantsooj]

root@beaglebone:~# cat /etc/dogtag
BeagleBoard.org Debian Image 2017-09-21

root@beaglebone:# cat /etc/debian_version
9.1
root@beaglebone:# cat /proc/cmdline
console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk1p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet

root@beaglebone:~# cat /sys/devices/platform/bone_capemgr/slots
cat: /sys/devices/platform/bone_capemgr/slots: No such file or directory

root@beaglebone:~# cat /boot/uEnv.txt
#Docs: http://elinux.org/Beagleboard:U-boot_partitioning_layout_2.0

uname_r=4.4.88-ti-r125
#uuid=
#dtb=

###U-Boot Overlays###
###Documentation: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Overlays
###Master Enable
enable_uboot_overlays=1

###Overide capes with eeprom
#uboot_overlay_addr0=/lib/firmware/.dtbo
#uboot_overlay_addr1=/lib/firmware/.dtbo
#uboot_overlay_addr2=/lib/firmware/.dtbo
#uboot_overlay_addr3=/lib/firmware/.dtbo

###Additional custom capes
#uboot_overlay_addr4=/lib/firmware/.dtbo
#uboot_overlay_addr5=/lib/firmware/.dtbo
#uboot_overlay_addr6=/lib/firmware/.dtbo
#uboot_overlay_addr7=/lib/firmware/.dtbo

###Custom Cape
#dtb_overlay=/lib/firmware/.dtbo

###Disable auto loading of virtual capes (emmc/video/wireless/adc)
#disable_uboot_overlay_emmc=1
#disable_uboot_overlay_video=1
#disable_uboot_overlay_audio=1
#disable_uboot_overlay_wireless=1
#disable_uboot_overlay_adc=1

###PRUSS OPTIONS
###pru_rproc (4.4.x-ti kernel)
uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-4-TI-00A0.dtbo
###pru_uio (4.4.x-ti & mainline/bone kernel)
#uboot_overlay_pru=/lib/firmware/AM335X-PRU-UIO-00A0.dtbo

###Cape Universal Enable
enable_uboot_cape_universal=1

###Debug: disable uboot autoload of Cape
#disable_uboot_overlay_addr0=1
#disable_uboot_overlay_addr1=1
#disable_uboot_overlay_addr2=1
#disable_uboot_overlay_addr3=1

###U-Boot fdt tweaks...
#uboot_fdt_buffer=0x60000
###U-Boot Overlays###

cmdline=coherent_pool=1M net.ifnames=0 quiet

#In the event of edid real failures, uncomment this next line:
#cmdline=coherent_pool=1M net.ifnames=0 quiet video=HDMI-A-1:1024x768@60e

##Example v3.8.x
#cape_disable=capemgr.disable_partno=
#cape_enable=capemgr.enable_partno=

##Example v4.1.x
#cape_disable=bone_capemgr.disable_partno=
#cape_enable=bone_capemgr.enable_partno=

##enable Generic eMMC Flasher:
##make sure, these tools are installed: dosfstools rsync
#cmdline=init=/opt/scripts/tools/eMMC/init-eMMC-flasher-v3.sh

root@beaglebone:~# config-pin -q p9.28
P9_28 pinmux file not found!
Cannot read pinmux file: /sys/devices/platform/ocp/ocp*P9_28_pinmux/state

root@beaglebone:~# config-pin -q p9.42
P9_42 Mode: pwm

root@beaglebone:~# uname -a
Linux beaglebone 4.4.88-ti-r125 #1 SMP Thu Sep 21 19:23:24 UTC 2017 armv7l GNU/Linux

[Altantsooj]

Sorry my mistake. ECAPPWM2 on P9_28. NOT P9_22.

[RobertCNelson]

@Altantsooj

P9.28 is hdmi-audio, in /boot/uEnv.txt add:

disable_uboot_overlay_audio=1

then reboot and try again.

Regards,

[silver2row]

Hello Alt,

Seth here. Hey, you may need more power. I do not know what set-up you have but I think my set-up does not work due to power constraints.

Seth

P.S. I tried the set-up and software to the "T" and changed things over and over. Power must be the issue. Try supplying 5v instead of 3.3v. This may work.

[silver2row]

Forget the Power Constraints,

I got the software to work on kernel 4.4.x. I am updating to kernel 4.9.x and I will return service after checking if the software works. I got GPIO and PWM to work.

Seth

[silver2row]

Hello Again,

I got put back to kernel 4.4.x. I got Adafruit_BBIO to work. I had to change up the software some but in the end, it worked for this specific kernel.

Seth

P.S. If you need help at all, drop me a line. Later for now.

[pdp7]

@Altantsooj were you able to try @RobertCNelson's instructions?

P9.28 is hdmi-audio, in /boot/uEnv.txt add:
disable_uboot_overlay_audio=1
then reboot and try again.

[pdp7]

@Altantsooj have you tried adding disable_uboot_overlay_audio=1 to /boot/uEnv.txt?

[pdp7]

@Altantsooj I am going to close this issue but please re-open if still a problem