read state of pcf after a reboot

This topic has 1 reply, 2 voices, and was last updated 2 years, 4 months ago by Renzo Mischianti.

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- 13 April 2023 at 20:45 #25312
  michael
  Participant
  hi renzo,
  
  i am going to use the pcf as a replacement for mcp23017. all ports are outputs (16). when using the mcp, pinmode putput, i can still read the registers state with readgpioab. this is very useful after a reboot to know in which state the mcp pins are (high or low). is it also possible to do the same with pcf? get the state of all outputs after a reboot? tnx for your help. mike
- 14 April 2023 at 17:04 #25335
  Renzo Mischianti
  Keymaster
  Hi Mike,
  Probably pcf8474 maintains the state with the continuous current.
  But my library restarted the pcf in Setup and I think you lost all.
  Bye Renzo
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