[GitHub] [incubator-nuttx] saramonteiro opened a new pull request #3583: xtensa/esp32: Adds freerun wrapper

[GitBox <gi...@apache.org>]

saramonteiro opened a new pull request #3583:
URL: https://github.com/apache/incubator-nuttx/pull/3583


   ## Summary
   This PR aims to:
   
   - Create a freerun wrapper for ESP32.
   
   ## Impact
   N/A
   ## Testing
   
   Tests results:
   To perform a test por the freerun wrapper was a little bit tricky, since it is not exposed as a character driver like oneshot is.
   So, I had to "violate" and call it from the user space:
   
   ![image](https://user-images.githubusercontent.com/33546913/115553052-5a0aba00-a283-11eb-95ec-cf9762897d5c.png)
   
   To make sure the the timer was properly configured and ensure its accuracy I tested the get counter function by using the timer driver because `usleep` and similar functions don't garante accuracy.
   Besides that, since the freerun standard timeout period is too long (the maximum the timer can count), I used other short period only to test the interrupt.
   
   Dependencies:
   Any timer instance that will be used by the freerun and CONFIG_ESP32_FREERUN.
   
   NOTE for future users:
   If someone wishes to develop some driver upon the freerun wrapper, have to keep in mind
   that the timer logic on bringup must be adjusted to prevent the used timer to be initialized as a character driver.
   Just like it was done for the oneshot.
   For now, since nothing is currently using freerun, there was anything to do on bringup.
   


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[GitHub] [incubator-nuttx] acassis merged pull request #3583: xtensa/esp32: Adds freerun wrapper

[GitBox <gi...@apache.org>]

acassis merged pull request #3583:
URL: https://github.com/apache/incubator-nuttx/pull/3583


   


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