Linux/PROCESSOR-SDK-AM335X: PWM capture not implemented

Karthikeyan R

Expert 1410 points

Part Number: PROCESSOR-SDK-AM335X

Tool/software: Linux

Hi,

I am using AM335x sdk,

My kernel version is 4.9.28-v01.00.01_r2-03021-geed43d1-dirty

I have enabled the PWM driver pwm-tiecap.c

I just followed this document

I cannot use the capture attribute in my sysfs.

root@txsky:~# cat /sys/class/pwm/pwmchip0/pwm0/capture
cat: read error: Function not implemented

Is it Implemented in latest SDK ?

Please provide me the guidance

over 7 years ago

0 Biser Gatchev-XID over 7 years ago

TI__Guru**** 393215 points

No, capture is not supported. See software-dl.ti.com/.../Foundational_Components.html

0 Karthikeyan R over 7 years ago in reply to Biser Gatchev-XID

Expert 1410 points

Hi Biser,

Thanks for the reply.
I want to make a counter based on Pulse generating (PWM)
For example for the period of 4 pulse i need to increment the counter value.

Can you give the guidance how to achieve this with existing driver ?

0 Pavel Botev over 7 years ago in reply to Karthikeyan R

TI__Guru**** 170625 points

Karthikeyan,

You can add capture support in the existing eCAP driver. For that purpose, you should work with AM335x TRM, section 15.3 Enhanced Capture (eCAP) Module

Regards,
Pavel

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Linux/PROCESSOR-SDK-AM335X: PWM capture not implemented