TIM2_CH2 PWM not work

[guansonghuang]

hello,st friends.

   My board use TIM2_CH1 pwm to drive a led.

dts configure as:

but the led can not light on.use these command

byw: I use gpio test led hardware is ok

[Sarra.S]

Hello @guansonghuang, 

Verify that the PWM is exported correctly, you should see pwm0 listed using 

ls /sys/class/pwm/pwmchip0 

 Also, try using an oscilloscope or logic analyzer to verify that the PWM signal is being generated on the correct pin (PF13)

[guansonghuang]

hi @Sarra.S 

I use oscilloscope vefify no pwm out on PF13;

but

1、if change pwm channel1 to PA5.that is ok

2、Enable all 4 pwm out,all other 3 pwm output correctlly excpt for PF13

[guansonghuang]

I verify TIM2_CH1 bare metal using PF13.  it is the same result as linux not working.

So  I assume that PF13 can not be assigened to TIM2_CH1.

please help to double check this. thank you

[Jean-Marc S · Accepted solution]

Hello

We discovered an issue in the Datasheet of the MP13.

It will be described in an errata and DS updated soon.

The TIM2_CH1 and TIm2_ETR are not available on all GPIO as listed currently on DS:

The correct settings are:

• PA0, PA15, PD3, PG8 only TIM2_CH1
• PE2, PF13, PE15 only TIM2_ETR
• PA5 both TIM2_CH1, TIM2_ETR

so in your case PF13 only supports TIM2_ETR.. not TIM2_CH1 

JM

[guansonghuang]

Thank you very much

[guansonghuang]

if errata release,please notify me

[Jean-Marc S]

ok

[Jean-Marc S]

Hello

Please note that the updated errata sheet is now available on st.com

https://www.st.com/resource/en/errata_sheet/es0539-stm32mp131x3x5x-device-errata-stmicroelectronics.pdf

JM