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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2020/11/30 09:08:07 UTC

[GitHub] [incubator-nuttx] diegoherranz opened a new issue #2446: STM32 PWM randomly changes polarity 

diegoherranz opened a new issue #2446:
URL: https://github.com/apache/incubator-nuttx/issues/2446


   Following the video tutorials by @acassis (thanks for those by the way!), I've noticed that the PWM output polarity changes randomly. 
   
   Build the stm32f103-minimum:pwm config:
   ```
   $ make distclean
   $ tools/configure.sh stm32f103-minimum:pwm
   $ make
   $ (flash with openocd) 
   ```
   
   Call the pwm example app a few times until the PWM polarity changes. It seems random but normally not more than 10 attempts needed to make it fail. 
   Inside NSH:
   ```
   nsh> pwm -d 10
   nsh> pwm -d 10 (run multiple times...)
   ```
   
   After the polarity has been reversed, it can come back to non-inverted if you keep running the same command.
   
   Enabling debug information, I've seen that the polarity bit in the CCER register does actually change.
   
   Good:
   `0pwm_dumpregs:  CCER:  0100 CNT:  d9544 PSC:   u000a ARR:   tffad`
   
   Bad:
   `0pwm_dumpregs:  CCER:  0300 CNT:  d9545 PSC:   u000a ARR:   tffad`
   
   It seems that something is toggling that bit, but I haven't seen what. Any idea? Am I doing something wrong?
   
   Thanks!


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[GitHub] [incubator-nuttx] xiaoxiang781216 closed issue #2446: STM32 PWM randomly changes polarity

Posted by GitBox <gi...@apache.org>.
xiaoxiang781216 closed issue #2446:
URL: https://github.com/apache/incubator-nuttx/issues/2446


   


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[GitHub] [incubator-nuttx] diegoherranz commented on issue #2446: STM32 PWM randomly changes polarity

Posted by GitBox <gi...@apache.org>.
diegoherranz commented on issue #2446:
URL: https://github.com/apache/incubator-nuttx/issues/2446#issuecomment-736032629


   See https://github.com/apache/incubator-nuttx/pull/2448#issuecomment-736032200
   
   Thanks.


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[GitHub] [incubator-nuttx] raiden00pl commented on issue #2446: STM32 PWM randomly changes polarity

Posted by GitBox <gi...@apache.org>.
raiden00pl commented on issue #2446:
URL: https://github.com/apache/incubator-nuttx/issues/2446#issuecomment-735844105


   Could you try https://github.com/apache/incubator-nuttx/pull/2448 ?


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