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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2021/01/19 03:18:13 UTC

[GitHub] [incubator-nuttx] v01d commented on pull request #2717: I2C bitbang driver (and nRF52 implementation)

v01d commented on pull request #2717:
URL: https://github.com/apache/incubator-nuttx/pull/2717#issuecomment-762575512


   BTW, this is yet untested since I'm unsure about proper GPIO handling on nRF52. I understand that the pin should be set to open-drain, but I think nRF52 does not really support this. So my reasoning is to using push-pull and switch between OUTPUT/INPUT when required. Although not sure if that is entirely safe (ie, if I send a 1 and the slave sends a 0). I think the drive setting should take care of that, but I've read something about this still being a bit dangerous:
   
   https://devzone.nordicsemi.com/f/nordic-q-a/28373/nrf52810-open-drain-gpio


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