Hi Gustavo, On 10/6/23, Gustavo Soares <gustavo.felipesoa...@hotmail.com> wrote: > Hi, Alan and David! > > I'm using nrf52_sx1509.c (at boards/arm/nrf62/thingy52/src) as model for my > driver. I've attached what I have wrote so far and I'd like to know if you > could tell me if I'm at the right direction: > [cid:efd68788-44d6-4e3f-a528-ab0fb1e35f03] (print from nrf52_sx1509.c, > nrf52_sx1509_pinscfg() method) > > My guess for what I should implement is to set the direction and option for > every pin in PCF8575 and after that write bytes to those I set as outputs, > is it correct? > what exactly does IOEXP_SETOPTION() do? >
Yes, I think you are moving on! The best way to search for NuttX documentation is looking the source code (all NuttX source code has a lot of documentation embedded on it) I use this command to find my direction: $ git grep IOEXP_SETOPTION So, it will return: include/nuttx/ioexpander/ioexpander.h: * Name: IOEXP_SETOPTION include/nuttx/ioexpander/ioexpander.h:#define IOEXP_SETOPTION(dev,pin,opt,val) ((dev)->ops->ioe_option(dev,pin,opt,val)) Please open this file and there you will find the comments explaining what these macros do. Best Regards, Alan
