[GitHub] [incubator-nuttx] raiden00pl commented on pull request #1788: nRF: Allow configuration of non connected GPIO

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

raiden00pl commented on pull request #1788:
URL: https://github.com/apache/incubator-nuttx/pull/1788#issuecomment-692492026


   This seems to be a problem with the SPI itself, not the GPIO. 
   We should add a configuration option to select SPIM in half-duplex mode.
   Add `bool halfduplex;` field to the 'struct nrf52_spidev_s' and set it up according to the configuration
   
   ```
   #if defined(CONFIG_NRF52_SPIM0_HALFDUPLEX) || defined(CONFIG_NRF52_SPIM1_HALFDUPLEX) || ...
   #  define NRF52_SPIM_HAVE_HALFDUPLEX 1
   #endif
   
   
   struct nrf52_spidev_s
   {
   ...
   
   #ifdef NRF52_SPIM_HAVE_HALFDUPLEX
     bool halfduplex;
   #endif
   };
   
   
   static struct nrf52_spidev_s g_spi0dev =
   {
      ...
   
   #ifdef CONFIG_NRF52_SPIM0_HALFDUPLEX
     .halfduplex = true,
   #endif
   }
   
   static int nrf52_spi_init(FAR struct nrf52_spidev_s *priv)
   {
      ...
   
     if (priv->halfduplex == false)
       {
         /* Select MISO pins */
   
         ...
       }
   }
   
   ```
   
   
   


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